Site U1491: Expedition 366

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Abstract

Site U1491 is located on the flank of Yinazao Seamount (informally known as Blue Moon Seamount) about 55 km west of the Mariana Trench. This site was chosen to characterize the composition and timing of various serpentinite mudflows to assess transport and alteration conditions on the midflank.

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Most cited references 14

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Chemistry of springs across the Mariana forearc shows progressive devolatilization of the subducting plate

Michael J. Mottl, C. Wheat, Patricia Fryer … (2004)

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Deep-slab fluids fuel extremophilicArchaeaon a Mariana forearc serpentinite mud volcano: Ocean Drilling Program Leg 195

Stephen Komor, Patricia Fryer, Craig Moyer … (2003)

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Serpentinite mud volcanism: observations, processes, and implications.

James Fryer (2011)

Large serpentinite mud volcanoes form on the overriding plate of the Mariana subduction zone. Fluids from the descending plate hydrate (serpentinize) the forearc mantle and enable serpentinite muds to rise along faults to the seafloor. The seamounts are direct windows into subduction processes at depths far too deep to be accessed by any known technology. Fluid compositions vary with distance from the trench, signaling changes in chemical reactions as temperature and pressure increase. The parageneses of rocks in the mudflows permits us to constrain the physical conditions of the decollement region. If eruptive episodes are related to seismicity, seafloor observatories at these seamounts hold the potential to capture a subduction event and trace the effects of eruption on the biological communities that the slab fluids support, such as extremophile Archaea. The microorganisms that inhabit this high-pH, extreme environment support their growth by utilizing chemical constituents present in the slab fluids. Some researchers now contend that the serpentinization process itself may hold the key to the origin of life on Earth.

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Author and article information

Journal

Journal ID (doi): 10.14379/iodp.proc.366.2018

Title: Proceedings of the International Ocean Discovery Program

Publisher: International Ocean Discovery Program

ISSN (Electronic): 2377-3189

Publication date (Electronic): 07 February 2018

Article

DOI: 10.14379/iodp.proc.366.104.2018

SO-VID: 681e7ecb-1ae2-441e-bd89-3f1a4e1ccc7b

License:

This work is licensed under a Creative Commons Attribution 4.0 Unported License. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/

History

ScienceOpen disciplines: Earth & Environmental sciences,Oceanography & Hydrology,Geophysics,Chemistry,Geosciences

Data availability:

ScienceOpen disciplines: Earth & Environmental sciences, Oceanography & Hydrology, Geophysics, Chemistry, Geosciences

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Cited by 3

Site U1492: Expedition 366
Authors: R.E. Price, V. Magalhaes, S.S. Mantovanelli …
Sites U1493, U1494, and U1495: Expedition 366
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Site U1498: Expedition 366
Authors: K. Michibayashi, C.L. Moyer, R.T. Kevorkian …

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Most referenced authors 140

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