Expedition 357 summary

Früh-Green, G. L., Orcutt, B. N., Green, S. L., Cotterill, C., Morgan, S., Akizawa, N., Bayrakci, G., Behrmann, Jan H., Boschi, C., Brazleton, W. J., Cannat, M., Dunkel, K. G., Escartin, J., Harris, M., Herrero-Bervera, E., Hesse, K., John, B. E., Lang, S. Q., Lilley, M. D., Liu, H.-Q., Mayhew, L. E., McCaig, A. M., Menez, B., Morono, Y., Quéméneur, M., Rouméjon, S., Sandaruwan Ratnayake, A., Schrenk, M. O., Schwarzenbach, E. M., Twing, K. I., Weis, D., Whattham, S. A., Williams, M. and Zhao, R. (2017) Expedition 357 summary Proceedings of the International Ocean Discovery Program, 357 . DOI 10.14379/iodp.proc.357.101.2017.

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International Ocean Discovery Program (IODP) Expedition 357
successfully cored an east–west transect across the southern wall of
Atlantis Massif on the western flank of the Mid-Atlantic Ridge
(MAR) to study the links between serpentinization processes and
microbial activity in the shallow subsurface of highly altered ultra-
mafic and mafic sequences that have been uplifted to the seafloor
along a major detachment fault zone. The primary goals of this ex-
pedition were to (1) examine the role of serpentinization in driving
hydrothermal systems, sustaining microbial communities, and se-
questering carbon; (2) characterize the tectonomagmatic processes
that lead to lithospheric heterogeneities and detachment faulting;
and (3) assess how abiotic and biotic processes change with varia-
tions in rock type and progressive exposure on the seafloor. To ac-
complish these objectives, we developed a coring and sampling
strategy centered on the use of seabed drills—the first time that
such systems have been used in the scientific ocean drilling pro-
grams. This technology was chosen in the hope of achieving high
recovery of the carbonate cap sequences and intact contact and de-
formation relationships. The expedition plans also included several
engineering developments to assess geochemical parameters during
drilling; sample bottom water before, during, and after drilling; sup-
ply synthetic tracers during drilling for contamination assessment;
acquire in situ electrical resistivity and magnetic susceptibility mea-
surements for assessing fractures, fluid flow, and extent of ser-
pentinization; and seal boreholes to provide opportunities for
future experiments. (...)

Document Type: Article
Keywords: International Ocean Discovery Program, IODP, RRS James Cook, Expedition 357, Site M0068, Site M0069, Site M0070, Site M0071, Site M0072, Site M0073, Site M0074, Site M0075, Site M0076, seabed drills, RD2, MeBo, Atlantis Massif, Atlantis Fracture Zone, Mid-Atlantic Ridge, Lost City hydrothermal field, serpentinization, detachment faulting, oceanic core complex, hydrogen, methane, deep biosphere, carbon cycling, carbon sequestration, contamination tracer testing
Research affiliation: OceanRep > GEOMAR > FB4 Dynamics of the Ocean Floor > FB4-GDY Marine Geodynamics
Refereed: No
DOI etc.: 10.14379/iodp.proc.357.101.2017
ISSN: 2377-3189
Projects: IODP
Date Deposited: 09 Feb 2017 10:25
Last Modified: 27 Feb 2017 14:00
URI: http://eprints.uni-kiel.de/id/eprint/36488

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