2014-2015

Expedition 357 Atlantis Massif Serpentinization and Life

Expedition 352 Izu-Bonin-Mariana Forearc

 

Expedition 357 Atlantis Massif Serpentinization and Life

October 2015 – December 2015

Atlantis Massif map

IODP Expedition 357: Atlantis Massif Serpentinization and Life aims to improve our understanding of seafloor serpentinization and its role in driving hydrothermal systems; sustaining microbiological communities; and the sequestration of carbon in ultramafic rock. The chosen site for this was the Lost City Hydrothermal Field (LCHF) atop the Atlantis Massif, Oceanic Core Complex 30°N on the Mid-Atlantic ridge. Large-scale serpentinization at sites like this is thought to have major effects on the rheology and geophysical properties of the oceanic lithosphere; as well as impacting on heat flux and geochemical processes.

Expedition 357 was the first IODP expedition to utilise seabed drills, in the form of BGS’s RD2 and MARUM’s MeBo, to drill a series of shallow holes in two transects. One spreading-parallel (east-west) profile investigating  microbial community evolution with respect to age and CO2 sequestration. The second, a north-south profile investigating microbial effects on various lithologies and in turn their effects on localizing detachment faults.

EPC provided offshore and onshore core physical properties services, and technical support for downhole logging operations for IODP Expedition 357.

 

Publications

As Petrophysics Staff Scientist, Sally Morgan is a co-author on the following expedition-related publications:

Preliminary Report

  • Früh-Green, G.L., Orcutt, B.N., Green, S., Cotterill, C., and the Expedition 357 Scientists, 2016. Expedition 357 Preliminary Report: Atlantis Massif Serpentinization and Life. International Ocean Discovery Program.http://dx.doi.org/​10.14379/​iodp.pr.357.2016

Expedition Proceedings

  • Früh-Green, G.L., Orcutt, B.N., Green, S.L., Cotterill, C., and the Expedition 357 Scientists (Morgan, S.), 2016. Atlantis Massif Serpentinization and Life. Proceedings of the International Ocean Discovery Program, 357: College Station, TX (International Ocean Discovery Program). http://dx.doi.org/10.14379/iodp.proc.357.2017

 

Expedition blog posts and news items

 

Expedition 352 Izu-Bonin-Mariana Forearc

July 2014 - September 2014

Expedition 352 Map

The principal aim of Expedition 352 is to examine magmatic evolution, chemostratigraphy and arc crustal accretion processes associated with subduction initiation in intra-oceanic convergent margins.  Downhole logging will provide in situ measurements from the volcanic basement intervals in two 1 km deep holes in the Izu-Bonin-Mariana Forearc.

Results will help test the following hypotheses:

  1. Forearc basalt tholeiites lie beneath boninites in the volcanic stratigraphy in this setting; and
  2. Forearc lithosphere created during subduction initiation is the birthplace of supra-subduction zone ophiolites.

 

 

Publications

  • Pearce, J.A., Reagan, M.K., Petronotis, K., Morgan, S., and IODP Expedition 352 Scientists. 2015. Izu-Bonin-Mariana fore arc: Testing subduction initiation and ophiolite models by drilling the outer Izu-Bonin-Mariana fore arc. Integrated Ocean Drilling Program: Preliminary Reports, doi: 10.14379/iodp.pr.352.2015.
  • Christeson, G., Morgan, S., et al., Physical Properties and Seismic Structure of Izu-Bonin-Mariana Fore Arc Crust: Results from IODP Expedition 352 and Comparison with Oceanic Crust, Geochemistry, Geophysics, Geosystems, 18. doi: 10.1002/2016GC006638.

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