IODP/ICDP-France News - Juillet-Août 2021 - Juillet-Août 2021
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IODP/ICDP-France News
Juillet-Août 2021
Deadlines / Keydates / News
Deadlines
Deadlines
+ Call for Applications:ECORD Summer School:Downhole logging
for IODP Science 2021 (ONLINE)
We are excited to announce, that we will be taking the “ECORD Summer School for IODP Science” online
this year. The school will take place between the 13th and 17th of September 2021 and combine in-person
sessions with asynchronous teaching, group activities and exercises form the IODP world.
This Summer School introduces the interpretation and applications of downhole logs and physical prop-
erty data primarily from the International Ocean Discovery Program (IODP). The School explores the rele-
IODP vance and unique insights of these data for a range of fields, including paleoclimatology, sedimentology,
hydrogeology, and broader geological and ecological processes such as sediment provenance and water
column productivity.
The Summer School is open to applicants from all career stages and geoscience backgrounds. However,
the course is tailored for individuals who:
- are early in their career and/or would like to introduce and make use of more physical properties data
in their research and/or;
- would like to get more involved in IODP in some capacity, either through accessing and using data or
sailing on an IODP research expedition.
Introductory sessions on petrophysics, the study of the physical (and chemical) properties of rocks and
their interactions with fluids, are at the heart of the Summer School. These core principles are then used
for insight into broader marine geoscience questions and environments through practical exercises and
presentations that provide experience of interpreting log data and integrating them with other datasets
based on real world applications
For more information and how to apply, please visit https://www2.le.ac.uk/departments/geology/re-
search/gbrg/projects/iodp/ecord-summer-school-2021 and please feel free to distribute this announce-
ment through your respective networks.
Best regards,
The Leicester EPC team
Dates of ECORD Summer School: 13-17 of September 2021 (Online)
Infos Application process: https://www2.le.ac.uk/departments/geology/research/gbrg/projects/iodp/ecord-summer-school-2021
Deadline for application: August 2, 2021.
NEWS News IODP
+ Henk Brinkhuis (Utrecht University) has been selected as the next chair of the IODP Forum. He will
begin his term on October 1.
IODP Link: http://www.iodp.org/docs/news-and-announcements/1125-2021-forum-chair-brinkhuis/file
+ The Sio7 website is currently offline while MarE3 investigates a security incident. They
will notify the community when access is restored.
IODP
+ IODP has been endorsed as part of the first set of Decade Actions of the UN Decade of Ocean
Science.
IODP
Link: https://www.oceandecade.org/resource/166/Announcement-of-the-results-of-the-first-endorsed-Decade-Actions-following-Call-for-Decade-Actions-No-012020
+ IODP sample requests are being accepted but completion and shipment of requests may be delayed
IODP
due to COVID-19. For the current status of each IODP core repository, contact the repository curator.
Link: http://www.iodp.org/resources/core-repositories
+ IMPORTANT: Recent JRFB Request for Information is open to all IODP nations.
IODP Letter from the Clive Neal, the Chair of the JOIDES Resolution Facility Board to IODP com-
munity. Please note Clive’s request for responses to the issue of a "Request for Information” that is central
to US efforts to secure a future replacement for the JR. Note that this request is directed to the global IODP
community and not just US-based scientists. It is vitally important that responses from non-US scientists
are also received in order to demonstrate support for future scientific ocean drilling from the international
community. The procedure for responding is very quick (5-10 minutes), so please make this a priority in
order to express your support.
Link: http://www.iodp-france.org/pro/wp-content/uploads/2021/03/2021-02-26-Community-Letter-JRFB-Update-1.pdf
+ Now Sailing: Reykjanes Mantle Convection and Climate 395C
IODP
Expedition 395C will begin addressing the overall goal of exploring
the relationships between deep Earth processes, ocean circulation,
and climate near the Reykjanes Ridge by working on three sites with
primarily crustal objectives.
Link: https://iodp.tamu.edu/scienceops/expeditions/reykjanes_mantle_convection_and_climate.html
+ Recently Completed (June 2021):
IODP
Expedition 386 aims to test and develop submarine paleoseismology by
recovering the continuous upper Pleistocene to Holocene stratigraphic
successions of trench-fill basins along an axis-parallel transect in the Japan
Trench.
Link: https://www.ecord.org/expedition386/
+ Recently Completed (June 2021): Complete South Atlantic Transect Reentry Systems
IODP
The South Atlantic Transect is a multidisciplinary scientific ocean drilling
project that comprises of multiple expeditions aimed at recovering com-
plete sedimentary sections and the upper underlying oceanic crust along
a slow/intermediate spreading rate Mid-Atlantic Ridge crustal flow line at
~31°S.
Link:http://iodp.tamu.edu/scienceops/expeditions/south_atlantic_transect.html
News ICDP
+ ICDP-EGER F3 Hartousov drill core: Sampling Party starts July 27
Next Tuesday the sampling party for drill core samples from the 239 m deep Hartousov borehole F3 at
the BGR Core Repository in Berlin-Spandau starts. Core samples will be available after formal application,
please contact Heiko Woith for details. (heiko.woith@gfz-potsdam.de)
More information abour Drilling the Eger Rift: https://www.icdp-online.org/projects/world/europe/eger-czechia-germany/
+ First Operational Phase of Bushveld Drilling Project underway : Logging 6000 meters of
donated drill cores from the Bushveld complex
In April, 2021 BVDP scientists at the University of the Free State in
Bloemfontein began logging 6000 -meters of donated drill cores
from the Bushveld complex, marking the start of the first phase
of operation. These drill cores cover the upper two-thirds of the 9
km-thick Bushveld layered intrusion and their donation by Impala
Platinum Ltd. is a major contribution to the success of the pro-
ject. Research projects from Germany and South Africa have been
funded to commence work on the drill cores once the logging and
documentation is completed. One goal is to identify breaks in the
variation of density and mineral composition with height that may
mark episodes of recharge into the magma chamber. Another is
to develop methods to combine EDXRF (energy dispersive X-ray fluorescence), hyperspectral and LIBS
(laser-induced breakdown spectroscopy) scanning to achieve rapid 2-D quantification of mineral modes,
textures and composition.
Another milestone was now reached in June, 2021, with agreement
by the South African Council for Geoscience to support BVDP with
an in-house Bushveld research unit as well as with resources and
staff at the National Core Library, where the new drill cores will be
housed and about 5000 meters of existing cores, including the well-
known Bellevue core, will be logged and documented for use in the
project.
The second operational phase of BVDP, expected to start in late
2021/early 2022, will involve drilling approximately 3000 meters to
continue the profile through the lower section of the intrusion and
into the floor rocks.
More about the BVDP project : https://www.icdp-online.org/projects/world/africa/bushveld-s-africa/
+ DOVE: Excellent progress / Drilling in Northern Switzerland reached 125 m
Coring at the DOVE drill site near Basadingen progresses well now
that thick gravelly sediments have been passed and the gravel is in-
terlayered with sands. The current drill depth is 125 m.
The Basadingen site in Northern Switzerland drills into a 250 m deep
glacially over-deepened trough filled with multiple sequences of
Quaternary sediments all the way to the bedrock contact. The field
core-laboratory is set up with the ICDP Geotek MSCL and logging of
the cores is ongoing under the supervision of scientists from the Uni-
versity of Bern. (DOVE: Drilling Overdeepened Alpine Valleys)
Use link to find out more about the DOVE project and daily messages.
https://www.icdp-online.org/projects/world/europe/alpine-valleys/
+ DOVE continues flying: Drilling 2nd borehole & seismic profiling at Tannwald completed.
In April, 2021 BVDP scientists at the University of the Free State in Bloemfontein began logging 6000 -me-
ters of donated drill cores from the Bushveld complex, marking the start of the first phase of operation.
These drill cores cover the upper two-thirds of the 9 km-thick Bushveld
layered intrusion and their donation by Impala Platinum Ltd. is a ma-
jor contribution to the success of the project. Research projects from
Germany and South Africa have been funded to commence work on
the drill cores once the logging and documentation is completed. One
goal is to identify breaks in the variation of density and mineral compo-
sition with height that may mark episodes of recharge into the magma
chamber. Another is to develop methods to combine EDXRF (energy
dispersive X-ray fluorescence), hyperspectral and LIBS (laser-induced
breakdown spectroscopy) scanning to achieve rapid 2-D quantification
of mineral modes, textures and composition.
Another milestone was now reached in June, 2021, with agreement by the South African Council for Geo-
science to support BVDP with an in-house Bushveld research unit as well as with resources and staff at the
National Core Library, where the new drill cores will be housed and about 5000 meters of existing cores,
including the well-known Bellevue core, will be logged and documented for use in the project.
The second operational phase of BVDP, expected to start in late 2021/early 2022, will involve drilling approxi-
mately 3000 meters to continue the profile through the lower section of the intrusion and into the floor rocks.
More about the BVDP project: https://www.icdp-online.org/projects/world/africa/bushveld-s-africa/
Panel meetings successful, new workshops & projects soon! Drilling Operations
ICDP pays or provides funding for drilling operations and related work for approved projects. However, addi-
tional funding from other third-party agencies or industry will be required.
ICDP’s financial contribution to projects may vary between 5% to more than 70% of the total operational
costs. The mean value was about 20% for all previous projects, with 5 to 10% for large projects and about 40%
for smaller projects. In addition, ICDP provides operational support such as instruments, measurements, ser-
vices and training through its Operational Support Group. This operational support is negotiated for each
scientific drilling project between the OSG and the respective Principle Investigators. Details are specified in
a 'Funding Agreement' Document.
If the need arises ICDP can administer third party funding of ICDP projects on a trust basis. In the recent
past, several ICDP projects have transferred third party funds to ICDP in order to pool funds, to avoid admin-
istration or to overcome annual funding restrictions. In each case, ICDP has established a Memorandum of
Understanding to lay down the amount of funding, the purpose of this ICDP project and that funds remaining
after the project will be redistributed. An example of such Memorandum can be found here.
Link: https://www.icdp-online.org/profile/funding/drilling-operations/?type=12&tx_icdpdatatables_pi1%5Bajaxcall%5D=1
} JOIDES Resolution Facility Board, June 23-25, 2021, La Jolla CA, USA
} Chikyu IODP Board, July 12-13, 2021, Kobe, Japan VIRTUAL
Réunions } Science Evaluation Panel, July 27-29, 2021, La Jolla, CA, USA VIRTUAL IODP
} ECORD Facility Board,September 29-30, 2021, Trieste, Italy
Panels } IODP Forum & PMO, October 11-13, 2021, Rome, Italy
} Environmental Protection and Safety Panel, February 22-23, 2021, College Station, TX, USA
IODP Meeting Outcomes
IODP
June 2021 JOIDES Resolution Facility Board Meeting (minutes)
New ! +
Link: http://www.iodp.org/jrfb-minutes/1128-jrfb-2021-june-minutes/file
New ! + JRFB Working Group on Science Framework Proposal Requirements and Assessment (final report)
Link: http://www.iodp.org/docs/meetings/1124-jrfb-wg-sfp-final-report/file
New ! + April/May 2021 IODP Forum Meeting (consensus items)
Link: http://www.iodp.org/forum-minutes-and-consensus-items/1123-forum-2021-april-consensus-items/file
+ January 2021 Science Evaluation Panel Meeting (minutes)
Link: http://www.iodp.org/science-evaluation-panel-minutes/1099-sep-2021-january-minutes/file
+ December 2020 IODP Town Hall - Dr. Terry Quinn's (NSF OCE Division Director) Presentation
Link: http://iodp.org/nsf-presentation-at-agu-2020-iodp-town-hall/file
Infos
Expéditions IODP
Expéditions + Multiple expeditions postponed! Many expeditions have been postponed due to platform repairs,
complications of drill sites in international waters, and the global health emergency. For more information
see the Expedition Schedule or contact the platform science operator.
Link: http://www.iodp.org/expeditions/science-operators
Link: http://www.iodp.org/expeditions/expeditions-schedule
IODP
IODP
Links : https://www.ecord.org/resources/reports/meetings/
https://mailchi.mp/ldeo/new-science-plan-structure-road-map-open-for-comments-742640?e=e91ffd4115
IODP
+ JRSO has produced a document called COPE - COVID Mitigation Protocols Established for
Safe JR Operations - for implementing IODP expeditions during the pandemic.
Link: http://iodp.tamu.edu/index.html
Actualités FRANCE
Futures
expédi- Expéditions IODP et scientifiques français sélectionnés :
tions
• Expédition 396 – Mid-Norwegian Continental Margin Magmatism (6 August–6 October 2021)
Lien internet : http://iodp.tamu.edu/scienceops/expeditions/norwegian_continental_margin_magmatism.html
IODP
´ Geoffroy T.F. Mohn (Petrologist) - University de Cergy Pontoise
• Expédition 395 – Reykjanes Mantle Convection and Climate (6 June to 6 August 2021) TBD
Lien internet : http://iodp.tamu.edu/scienceops/expeditions/reykjanes_mantle_convection_and_climate.html
´ Anne Briais (Co-Chief Scientist) - LGO-IUEM, Plouzané
´ Gabriel T. Pasquet (Petrologist) - University of Pau and Pays de l’Adour
• Expédition 386 – Japan Trench Paleoseismology (Offshore: 13 April 2021 – 1 June 2021 / Onshore: Octo-
ber to November 2021)
Lien internet : http://www.ecord.org/expedition386/
´ Morgane Brunet (Sedimentologist and XCT specialist) - Geosciences Rennes
´ Antonio Cattaneo (Sedimentologist) - IFREMER, Plouzané
´ Chloé Seibert (Physical Properties Specialist) - Institut de Physique du Globe de Paris
´ Jean Noël Proust (Sedimentologist) - Geosciences Rennes
• Expédition 391 – Walvis Ridge Hotspot (6 December 2021 to 6 February 2022)
Lien internet : http://iodp.tamu.edu/scienceops/expeditions/walvis_ridge_hotspot.html
´ Claire A. Carvallo (Paleomagnetist) - Institut de Minéralogie, de Physique des Matériaux et de Cos-
mochimie Sorbonne Université, Paris
´ Mark S. Zindorf (Inorganic/Organic Geochemist) - IFREMER, Plouzané
• Expédition 392 – Agulhas Plateau Cretaceous Climate (5 February to 7 April 2022)
Lien internet : http://iodp.tamu.edu/scienceops/expeditions/agulhas_plateau_climate.html
´ pas de français sélectionnés
• Expédition 390 – South Atlantic Transect #1 + Expédition 393 – South Atlantic Transect #2 (7 April - 7
August 2022)
Lien internet : http://iodp.tamu.edu/scienceops/expeditions/south_atlantic_transect.html
´ pas de français sélectionnés
• Expedition 393 – South Atlantic Transect
Lien internet : http://iodp.tamu.edu/scienceops/expeditions/south_atlantic_transect.html
´ pas de français sélectionnés
• Expédition 387 – Amazon Margin (26 April to 26 June 2020)
Lien internet : http://iodp.tamu.edu/scienceops/expeditions/amazon_margin.html EN ATTENTE
´ Germain Bayon (Inorganic Geochemist) -IFREMER, Plouzané
´ Florent J. Hodel (Paleomagnetist) - GET, Toulouse
´ Alberto Machado Cruz (Stratigraphic Correlator/Physical Properties Specialist) - ISTeP, Paris
´ Marina Rabineau (Physical Properties Specialist/Downhole Measurements) - IUEM, Brest
• Expédition 388 – Equatorial Atlantic Gateway (June 26 - Aug 26, 2020) EN ATTENTE
Lien internet : http://iodp.tamu.edu/scienceops/expeditions/equatorial_atlantic_gateway.html
´ Marie Laugié (Physical Properties Specialist/Stratigraphic Correlator) - CEREGE, Aix-en-Provence
Soutiens financiers IODP-France :
SOUTIENS
À LA
RECHERCHE Appel d’offres au fil de l’eau “Soutien Financier Post-Campagne”
IODP-France
Cet appel d’offres est destiné spécifiquement au financement de l’exploitation des données et échantillons
prélevés au cours des expéditions de forage scientifique IODP. Les projets portant sur des expéditions ve-
nant de s’achever seront financés en priorité. Les demandes portant sur l’exploitation d’expéditions anciennes
(programmes DSDP, ODP et IODP ≥ 2 ans) seront également considérées.
Infos : http://www.iodp-france.org/pro/appels-doffres-iodp-france/soutient-financier-post-cruise/
Contacts : iodp-france@get.omp.eu / stephanie.cuven@get.omp.eu
“Sample Request” = valorisation des expéditions anciennes
Vous pouvez à tout moment faire une demande de
rééchantillonage auprès des 3 carothèques IODP afin d’in-
itier de nouvelles études sur des expéditions passées. Une
IODP
aide financière pour réaliser votre projet scientifique pourra
vous être attribuée par le Bureau IODP-France dans le cad-
re d’un “Soutien financier Post-Cruise - campagnes anci-
ennes”, ceci après évaluation de votre projet par le comité
IODP-France.
Lien “sample access” : https://www.iodp.org/resources/access-data-and-samples
Lien “Demande de soutien financier Post-Cruise IODP-France” : htp:/wwwo
.idp-france.org/pro/appesl-dofres-o
i dp-france/souteint-fn
ianceir-post-crusie/
+ About Sample Requests: IODP sample requests are being accepted but completion and shipment of
requests may be delayed due to Covid-19. For the current status of each IODP core repository, contact the
IODP repository curator.
Link: http://www.iodp.org/resources/core-repositories
Journées d’information “Porteurs de projet IODP” :
Le bureau IODP-France organise actuellement des
séminaires d’information dans toute la France sur
le thème: “Historique et Fonctionnement du Pro-
gramme IODP, comment participer, comment
monter un projet d’expédition IODP ?”. Les scien-
tifiques impliqués dans IODP en tant qu’embarquant
seront invités à présenter leurs résulats et les scien-
tifiques impliqués dans IODP en tant que porteur
de projet ayant abouti à une expédition seront les
bienvenus pour expliquer la procédure à suivre, don-
ner des conseils sur le contenu et le format d’une de-
mande “idéale”, sur les pièges rédactionnels à éviter,
etc...
Si votre laboratoire est intéressé pour nous recevoir, veuillez nous contacter aux adresses suivantes :
iodp-france@get.omp.eu / stephanie.cuven@get.omp.eu
En attendant de nous recevoir pour un séminaire, voici le lien pour télécharger le guide pour soumettre un projet
de forage : https://www.iodp.org/iodp-proposal-submission-guidelines-8-2016/file
Workshops / Publications /
Annonces diverses
Workshops ou congrès en rapport avec les programmes
Workshops IODP et ICDP
IMPACT Workshop Series: Preparing the Next Generation
IODP Conveners: Carol Cotterill (Lamont-Doherty Earth Observatory), Don Haas (Cornell University), Adriane
Lam (Binghamton University), and Kristen St John (James Madison University).
Dates et lieu : August 2-4 2021
Infos : https://serc.carleton.edu/IODP/index.html
IODP
36th International Geological Congress
Dates et lieu : August 16-21 2021 - Delhi, India
Infos : https://www.36igc.org/
27ème Réunion des Sciences de la Terre
Dates et lieu : 1-5 Nov 2021 - Lyon, France
IODP
Infos : https://rst2020-lyon.sciencesconf.org/
MagellanPlus "BlackGate: Black Sea – Mediterranean Gateway
IODP Exchange"
Dates et lieu : 22-24 September 2021, Frankfurt/Main, Germany
Infos: https://www.uu.nl/en/events/blackgate-magellan-plus-workshop
Flyer: https://www.ecord.org/science/magellanplus/
EXPLORATORY WORKSHOPS: "Investigating the Oceanic Life
IODP
Cycle of Tectonic Plates" with Mission-Specific Scientific Drilling
pre-workshop meeting: mid-January 2022
Dates et lieu : 1-2 April 2022, Vienna, Austria – ONLINE
Flyer: https://www.ecord.org/science/magellanplus/
MagellanPlus "TIMOR: Tracing Monsoon, Ocean currents and
IODP diagenetic carbon Redistribution"
Dates et lieu : 31 March-2 April 2022,Vienna, Austria
Infos & Flyer: Flyer: https://www.ecord.org/science/magellanplus/
MagellanPlus "IO:DIP – Indian Ocean: Delving Into the Past"
IODP Postponed due to Covid-19 situation
Dates et lieu : 10-13 April 2022 – Graz, Austria. Online Pre-Workshop Meetup: 20-21 September 2021
Flyers here: https://www.ecord.org/science/magellanplus/
Infos : http://indian-ocean.uni-graz.at/
EXPLORATORY WORKSHOPS: "Mission-specific platform approach-
IODP es to assessing natural hazards that impact society"
Dates et lieu : 8-10 July 2022, Lisbon, Portugal
Flyer: https://www.ecord.org/science/magellanplus/
MagellanPlus Workshop COSNICA : "The life cycle of a mi-
IODP croplate at a convergent margin" Postponed due to Covid-19 situation
Dates et lieu : spring 2022, Graz, Austria.
Infos : http://cosnica.uni-graz.at/
MagellanPlus SCYLLA Workshop " Serpentinite diapir in the
IODP Calabrian subduction sYstem return Lower plate mantLe
from eArth's odest ocean" Postponed due to Covid-19 situation
Dates et lieu : 27-29 October 2020, Bologna, Italy
Infos : https://www.ecord.org/science/magellanplus/
IODP MagellanPlus "Belize Barrier Reef " Postponed due to Covid-19 situation
Dates et lieu : 2022 Frankfurt/Main, Germany -
Infos : https://www.ecord.org/science/magellanplus/
Workshop "DriMMLOC Drilling the Mantle, Moho, and Lower
IODP Crust" Postponed due to Covid-19 situation
Dates et lieu : TBD, Tongji University, Shanghai, China
Infos : http://www.iodp-china.org/DriMMLOC
Monsoon Seminar Series weekly in 2021
A new online weekly meeting which will highlight recent developments in monsoon science including a
IODP sustained campaign of scientific ocean drilling offshore. Starting 13 January 2021
Infos: Find out more about schedules, time table with seminar topics and links to Zoom meetings.
Infos : https://www.monsoongeoseminars.com/
Publica- Nouvelles publications IODP-France / ECORD / IODP
tions
New Issue of Scientific Drilling, a multidisciplinary ICDP-IODP program journal
delivering peer-reviewed science reports from recently completed and ongoing international scientific
IODP drilling projects. Issue number 29 is available online.
Link: http://www.scientific-drilling.net/index.html
https://sd.copernicus.org/articles/29/index.html
A fully designed, complete draft version of the 2050 Science
Framework entitled “Exploring Earth by Scien-
IODP tific Ocean Drilling” is now available online on IODP.org and
ready for community review and your comments
Download: https:/iodp.org/2050-science-framework?fbclid=IwAR1fCTngW6r7Pd9R6vup8yZ2iwwZx_gPO3sKluihh0OYRKZvcld-OJf7IA
ICDP Newsletter SPRING 2021
Link: https://www.icdp-online.org/fileadmin/icdp/outreach/doc/ICDPnewsletter2021-spring.pdf
ICDP Annual Report 2020
Download : https://www.icdp-online.org/uploads/pics/Annual_ICDP_Report_2020_01.jpg
ECORD Annual Report 2019
Download : http://www.ecord.org/resources/reports/activities/
Technical Note 4: Recommendations for Microbiological Sampling and Contamination Tracer
Use Aboard the JOIDES Resolution Following 20 Years of IODP Deep Biosphere Research
IODP Link: http://iodp.tamu.edu/publications/TN/TNote_4.pdfParution des derniers Proceedings IODP
IODP Link: http://iodp.tamu.edu/publications/proceedings.html
Expedition 382: Iceberg Alley and Subantarctic Ice and Ocean Dynamics - 20 May 2021
Link: http://publications.iodp.org/proceedings/382/382title.html
Expedition 379: Amundsen Sea West Antarctic Ice Sheet History - 23 February 2021
Link: http://publications.iodp.org/proceedings/379/379title.html
Proceedings of the Oman Drilling Project - 24 April 2020
Link: http://publications.iodp.org/other/Oman/OmanDP.html
Parution des derniers "Data Reports"
IODP
Expedition 369 (Australia Cretaceous Climate and Tectonics): Radiolarians from the Latest
Cenomanian and Turonian, Hole U2512A and U1516C
Link: http://publications.iodp.org/proceedings/369/203/369_203.html
Expedition 369 (Australia Cretaceous Climate and Tectonics): Moisture and Density Analysis and Ultra
sonic Velocity, Hole U1513E
Link: http://publications.iodp.org/proceedings/369/204/369_204.html
Parution des derniers "Preliminary Reports" IODP
IODP
Expedition 390C (South Atlantic Transect Reentry System) Preliminary Report
Link: http://publications.iodp.org/preliminary_report/390C/
Liens pour télécharger le rapport IODP-France
2003-2016
Vous y trouverez les dernières statistiques sur la participation française au Programme
IODP et les résultats majeurs des expéditions récentes.
http://www.iodp-france.org/pro/wp-content/uploads/2017/01/BilanIODP-France2016.pdf
Liens pour télécharger le Science Plan IODP 2013-2023 :
IODP
https://www.iodp.org/science-plan/115-iodp-science-plan-br/file
https://www.iodp.org/science-plan/127-low-resolution-pdf-version/file
Liens pour télécharger le Science Plan ICDP 2020-2030 :
Video : https://www.icdp-online.org/fileadmin/icdp/media/doc/ICDP_Science_Plan_Video.mp4
Link: https://www.icdp-online.org/media/icdp-science-plan/Sciences IODP
Avancées scientifiques : " SW Indian Ridge Lower Crust and
Moho " - Exp. IODP 360, ODP Leg 118, ODP Leg 176
Participant(e)s français : Carlotta Ferrando (Géosciences Montpellier) ; Lydéric France (CRPG) ; Benoit Ildefonse
(Géosciences Montpellier) ;
Données : Expéditions IODP 360 Hole U1473A, ODP Leg 118 Hole 1109A et ODP Leg 176 Hole 735B
Financement : IODP-France « Expédition anciennes» CNRS-INSU
Grain size variations record segregation of residual melts in slow-spreading oceanic
crust (Atlantis Bank, 57°E Southwest Indian Ridge)
C. Ferrando1,2,*, L. France1, V. Basch2, A. Sanfilippo2, R. Tribuzio2, M. Boulanger1
*: ferrando@crpg.cnrs-nancy.fr
1: Université de Lorraine, CNRS, CRPG, F-54000 Nancy, France.
2: Dip. di Scienze della Terra e dell’Ambiente, Università degli Studi di Pavia, I-27100 Pavia, Italy
Beneath slow-spreading ridges, melt bodies are generally Hole U1473A (Dick et al., 2019a; MacLeod et al., 2017), in
considered to represent ephemeral magma reservoirs filled one of the best studied Oceanic Core Complexes (OCC),
with crystal mushes. Formation of the oceanic crust requires the Atlantis Bank OCC (Dick et al., 2000; 2019b) along the
at least partial extraction of melts from these crystal mushes. ultraslow-spreading Southwest Indian Ridge (Fig. 1). This
However, melts collection and extraction are processes yet raised dome exposes massive gabbro on the seafloor; its
to be fully constrained. This project aimed at understanding formation is interpreted to result from initial uplift by de-
processes of melt migration, collection and segregation tachment faulting at the ridge-transform intersection, and
throughout the lower oceanic crust. We investigated olivine subsequently offset during a period of change in the spread-
gabbros from the plutonic section recovered at the IODP ing direction (Baines et al., 2008).
Fig. 1: Location of the Atlantis Bank OCC and detailed 3D reconstruction of its dome structure (looking NE) modified after MacLeod et al. (2017). Holes were
drilled on the flat top of the dome. In details, Holes 1109A and 735B were drilled during Legs 118 and 176 of the Ocean Drilling Program, and Hole U1473A, stud-
ied here, during Expedition 360 of the Integrated Ocean Discovery Program.Fig. 2: Example of recovered irregular grain-size contacts in U1473A olivine gabbros. (a) Core 74R-7 shows wavy and lobate contact with a close-up (orange box)
in (b). (c) Coarse-grained plagioclase displays corroded grain boundaries at contact with fine-grained crystals (mostly plagioclase and clinopyroxene). (d) Large
poikilitic clinopyroxene oikocryst embay plagioclase showing corroded grain boundaries. Images after Ferrando et al. (2021).
IODP Hole U1473A was drilled during International Ocean
Discovery Program (IODP) Expedition 360 into the flat
summit of the OCC (MacLeod et al., 2017). This borehole
penetrated ~810 meters below sea floor (mbsf), recovering
a section of lower oceanic crust mainly composed of olivine
gabbros (76.5 %), less abundant disseminated-oxide gabbro
(containing 1–2% oxide; 9.5% of recovery), oxide gabbro
(>5% oxide; 7.5% of recovery), and gabbro (sensu stricto; 5%
of recovery), and minor felsic veins (1.5%). Throughout the
Hole, primary variations in grain-size (i.e., not overprinted
by crystal-plastic deformation) from fine- to coarse-grained
intervals are copious in olivine gabbros and observed at all
depths (121 contacts; on average one contact every ~4 m of
recovered core). Grain-size variations are mostly irregular
and “patchy”, i.e. sutured displaying variable orientation,
and show coarse-grained domains included into a fine-
grained matrix, with variable thickness of fine- (or medium-)
and coarse-grained intervals (Fig. 2a-b); these grain-size
variations are referred to as ‘irregular contacts’ and were
investigated in Ferrando et al. (2021) and Ferrando et al. Fig. 3: Mg# vs TiO2 (wt%) of clinopyroxene in a representative sample of
(under review). Less commonly, grain-size variations have grain-size contact. We report for comparison variations in clinopyroxene
compositions during: i) melt-mush reaction reproduced in reactive crystalli-
planar and subparallel contacts defining a layering; this type zation experiments of a primitive MORB percolating through a troctolite; ii)
of grain-size variations were studied by Boulanger et al. (sub- crystallization experiments of a tholeiitic basalt with composition corre-
mitted). Here, we present the irregular grain-size contacts. sponding to a microgabbro from Hole 735B at 1 kbar.Fig. 4: Schematic reconstruction of the microstructure and chemical evolution from crystal mush to formation of grain-size variations in the studied olivine gabbro. The processes recorded can be summarized as follows. (a) Heterogeneously distributed olivine + plagioclase crystals form after crystallization in-situ (up to 20-30% of melt fractionation) of primitive melts in a crystal mush. (b) Melts within the crystal mush (possibly residual from former minerals crystalliza- tion) begin to migrate through the permeable olivine+plagioclase (±clinopyroxene?) framework and, being in disequilibrium with the more primitive composi- tions of pre-existing minerals, partially dissolve olivine1 and plagioclase1 and concomitantly crystallize olivine2, plagioclase2 and clinopyroxene2; crystals pref- erentially grow and coarse-grained intervals are formed at temperatures of ~1150°C. Note that only plagioclase and olivine display resorbed grain boundaries, while clinopyroxene does not show textural evidences of dissolution. It is possible that few crystals of clinopyroxene1 also formed the pre-existing crystal mush; some crystal cores could represent former clinopyroxene, but we have no certain and clear evidence at this point. (c) The reactive melt migration proceeds at decreasing TL and TS. Melts residual from interaction both crystallize at the rims of pre-existing coarse-grained minerals and are pervasively collected in high porosity zones. In these zones, the delay in nucleation produces an increase in undercooling at decreasing TS that ultimately results in high nucleation rates; new nuclei preferentially form, and the segregated residual melts crystallize to form the fine-grained olivine gabbros at temperatures of ~1050°C.
Textures of coarse-grained olivine gabbro are predominantly References
subophitic with subhedral tabular plagioclase partly or fully
enclosed within poikilitic clinopyroxene (Fig. 2d), while fine- Baines, A. G., Cheadle, M. J., John, B. E., & Schwartz, J. J. (2008). The rate of oce-
anic detachment faulting at Atlantis Bank, SW Indian Ridge. Earth and Planetary
grained olivine gabbros are characterized by granular tex- Science Letters, 273, 105–114. https://doi.org/10.1016/j.epsl.2008.06.013.
tures with euhedral to subhedral crystals. Along the contacts,
coarse-grained minerals display resorbed grain boundaries Boulanger, M., France, L., Deans, J. R., Ferrando, C., Lissenberg, J., & von der
against the fine-grained minerals (Fig. 2c), suggesting partial Handt, A. (2020). Magma reservoir formation and evolution at a slow-spreading
center (Atlantis Bank, Southwest Indian Ridge). Frontiers in Earth Sciences.
dissolution by the melt crystallizing the fine-grained mate- https://doi.org/10.3389/feart.2020.554598.
rial. Resorbed grain-boundaries are also observed in coarse-
grained intervals, commonly in plagioclase and olivine crys- Boulanger, M., France, L., Ferrando, C., Ildefonse, B., Ghosh, B., Sanfilippo, A.,
tals against large grains of poikilitic clinopyroxene (Fig. 2d). Morishita, T., Liu, C., Koepke, J. & Bruguier, O. (submitted). Melt migration and
interactions in the lower oceanic crust: insights from Atlantis Bank interlayered
series at IODP Hole U1473A (Southwest Indian Ridge). Journal of Petrology.
The coarse-grained olivine gabbro exhibits clinopyroxene
and plagioclase geochemical zoning, showing progressive Dick, H. J. B., MacLeod, C. J., Blum, P., Abe, N., Blackman, D. K., Bowles, J. A.,
chemical evolution from more primitive crystal cores to more et al. (2019a). Dynamic accretion beneath a slow-spreading ridge segment:
IODP Hole 1473A and the Atlantis Bank Oceanic Core Complex. Journal of
evolved crystal rims (Ferrando et al., 2021). From the core Geophysical Research: Solid Earth, 124, 2631–12659. https://doi.org/10.1029/
to the rim of clinopyroxene, compatible elements decrease 2018JB016858.
(e.g., Mg# and Cr) and incompatible elements increase. Dick, H. J. B., Kvassnes, A. J. S., Robinson, P. T., MacLeod, C. J. & Kinoshita, H.
With respect to plagioclase core, the rims are enriched in (2019b). The Atlantis Bank Gabbro Massif, Southwest Indian Ridge. Progress in
Earth and Planetary Science, 6:64. https://doi.org/10.1186/s40645-019-0307-9.
LREE, and slightly depleted in HREE and Y (Ferrando et al., Dick, H. J. B., Natland, J. H., Alt, J. C., Bach, W., Bideau, D., Gee, J. S., et al.
2021). Notably, crystal rim compositions display enrichments (2000). A long in situ section of the lower ocean crust: Results of ODP Leg 176
in some of the most incompatible elements, such as Zr in drilling at the Southwest Indian Ridge. Earth and Planetary Science Letters,
clinopyroxene and Ce in plagioclase, thereby leading to 179, 31–51. https://doi.org/10.1016/S0012-821X(00)00102-3.
stronger fractionations of most/less incompatible elements, Ferrando, C., France, L., Basch, V., Sanfilippo, A., Tribuzio, R., & Boulanger,
namely. Ti is also remarkably enriched at the rims of clinopy- M. (2021). Grain size variations record segregation of residual melts in
roxene crystals (Fig. 3). Fine-grained minerals are unzoned slow-spreading oceanic crust (Atlantis Bank, 57°E Southwest Indian Ridge).
and chemically similar to rims of coarse-grained minerals, Journal of Geophysical Research: Solid Earth, 126, e2020JB020997. https://doi.
org/10.1029/2020JB020997.
indicating a genetic relationship (Fig. 3).
Ferrando, C., Basch V., Ildefonse, B., Deans, J., Sanfilippo, A., Barou, F., France,
These minor and trace element enrichments exceed values L. (under review). Compaction-driven melt extraction and accumulation in a
predicted for magmatic crystallization at (low) pressures as- slow-spreading oceanic crust: microstruc-tures of olivine gabbros from the
Atlantis Bank (IODP Hole U1473A, SWIR). Tectonophysics.
sumed for gabbros formation beneath slow-spreading ridges
(Fig. 3). The dissolution-crystallization textures observed in Gao, Y., Hoefs, J., Hellebrand, E., von der Handt, A., & Snow, J. (2007). Trace el-
the studied olivine gabbros point to reactive processes often ement zoning in pyroxenes from ODP Hole 735B gabbros: Diffusive exchange or
described in sections of lower oceanic crust, mostly at the synkinematic crystal fractionation? Contributions to Mineralogy and Petrology,
153, 429–442. https://doi. org/10.1007/s00410-006-0158-4.
Atlantis Bank OCC (e.g., Boulanger et al., 2020; Gao et al.,
2007; Lissenberg & MacLeod, 2016; Sanfilippo et al., 2020; Lissenberg, C. J., & MacLeod, C. J. (2016). A reactive porous flow control on mid-
Zhang et al., 2020). We thus attribute significant enrich- ocean ridge magmatic evolution. Journal of Petrology, 57, 2195–2220. https://
ments in the most incompatible elements of plagioclase and doi.org/10.1093/petrology/egw074.
clinopyroxene to a magma evolution process associated with MacLeod, C. J., Dick, H. J. B., Blum, P., Abe, N., Blackman, D. K., Bowles, J. A.,
reactive melt migration. Using the Assimilation-fractional et al. (2017). Proceedings of the Integrated Ocean Discovery Program (Vol. 360).
crystallization equation, we demonstrate that formation of https://doi.org/10.14379/iodp.proc.360.103.2017.
U1473A olivine gabbros, and their characteristic grain-size
Sanfilippo, A., MacLeod, C. J., Tribuzio, R., Lissenberg, C. J., & Zanetti, A.
variations, involve early crystallization of a gabbroic matrix (2020). Early-stage melt-rock reaction in a cooling crystal mush beneath a
in a crystal mush, and subsequent mineral-melt reactions slow-spreading mid-ocean ridge (IODP Hole U1473A, Atlantis Bank, Southwest
driven by melt reactive porous flow (Fig. 4; Ferrando et al., Indian Ridge). Frontiers in Earth Science, 8, 579138. https://doi.org/10.3389/
2021). As temperature decreased, melts residual from the feart.2020.579138.
reactive processes were segregated in magma pockets that Zhang, W. Q., Liu, C. Z., & Dick, H. J. B. (2020). Evidence for multi-stage melt
ultimately crystallize the fine-grained intervals, also referred transport in the lower ocean crust: Atlantis Bank Gabbroic Massif (IODP
to as microgabbros (Fig. 4). We document, for the first time, Hole U1473A, SW Indian Ridge). Journal of Petrology, egaa082. https://doi.
that these microgabbros are crystallization products of org/10.1093/petrology/egaa082.
melts modified by reactive melt migration; the melts were
extracted from the crystal mush and accumulated into dis-
crete melt-rich zones. Melt extraction from coarse-grained
intervals and melt accumulation into fine-grained intervals
was aided by compaction of the crystal mush (Ferrando et
al., under review). This process could have promoted partial
extraction of those melts that in turn potentially contribute
to MORBs erupted at the seafloor.Vidéos
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https://www.youtube.com/channel/UCRXy7d9gLgavaxKIPgnqaTgRécemment dans les News
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IODP Exp. 362 ••• Floating lab drills 1.5km below sea floor to
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