Microbial Biosignatures Associated with Iddingsite in Hadal Basalts from the Southern Mariana Trench

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国家科技期刊平台
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外文摘要：Iddingsitization is an aqueous alteration that is known to take place in meteorites and continental basalts providing a potential habitat for microbial life.However,little is known about the exact mode by which this reaction occurs in the hadal seafloor and its implication for the deep subsurface biosphere.A comprehensive investigation of hadal basalts from the southern Mariana Trench(SMT)conducted with microscopic examinations shows that iddingsite occurs as augite-hosted veins,rims,and mineral grains formed completely in place of augite within the SMT basalts.Carbon geochemistry indicates that organic matter with homogenous δ13C values between-27.8‰ and-27.2‰ might be biogenically accumulated in the SMT basalts.Furthermore,the close spatial relationships between carbonaceous matter(CM)and goethite in iddingsite point to microbial attachment to iddingsite minerals.Thus,iddingsitization might have fueled H2-utilizing microorganisms inhabiting the hadal oceanic crust,thereby leading to the formation of CM,as implied by oxygen isotopic compositions revealing low alteration temperatures(32-83℃)favorable for microbial growth.In all,microbial biosignatures associated with iddingsite in the SMT basalts are highlighted,and these results could pave the way for deciphering the deep subsurface biosphere at hadal zones.

外文关键词：

geobiologybiosignaturesiddingsitecarbonaceous mattersubsurface biosphereMariana Trench Pacific Ocean

作者：

GUO Zixiao、HU Yazhen、DU Qingying、LIU Yadong、QIN Guohong、PENG Xiaotong

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作者单位：

School of Geographical Sciences,Hebei Key Laboratory of Environmental Change and Ecological Construction,Hebei Normal University,Shijiazhuang 050024,China

Department of Earth Sciences,University College London,London,WC1E 6BT,UK

Institute of Deep-Sea Science and Engineering,Chinese Academy of Sciences,Sanya,Hainan 572000,China

出版年：

2024

DOI：

10.1111/1755-6724.15187

地质学报(英文版)

中国地质学会

地质学报(英文版)

CSTPCD

影响因子：1.414

ISSN：1000-9515

年,卷(期)：2024.98(6)