Deep submarine infiltration of altered geothermal groundwater on the south Chilean Margin

Deep submarine infiltration of altered geothermal groundwater on the south Chilean Margin
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智利南缘改变的地热地下水深部海底渗透

DOI:
10.1038/s43247-022-00541-3
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发表时间:
2022
影响因子:
7.9
通讯作者:
Aiello, Ivano W.
Aiello, Ivano W.
中科院分区:
环境科学与生态学2区
文献类型:
--
作者:
Clementi, Vincent J.;Rosenthal, Yair;Bova, Samantha C.;Thomas, Elizabeth K.;Wright, James D.;Mortlock, Richard A.;Cowling, Owen C.;Godfrey, Linda V.;Childress, Laurel B.;Aiello, Ivano W.

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Submarine groundwater discharge is increasingly recognized as an important component of the oceanic geochemical budget, but knowledge of the distribution of this phenomenon is limited. To date, reports of meteoric inputs to marine sediments are typically limited to shallow shelf and coastal environments, whereas contributions of freshwater along deeper sections of tectonically active margins have generally been attributed to silicate diagenesis, mineral dehydration, or methane hydrate dissociation. Here, using geochemical fingerprinting of pore water data from Site J1003 recovered from the Chilean Margin during D/VJOIDES ResolutionExpedition 379 T, we show that substantial offshore freshening reflects deep and focused contributions of meteorically modified geothermal groundwater, which is likely sourced from a reservoir ~2.8 km deep in the Aysén region of Patagonia and infiltrated marine sediments during or shortly after the last glacial period. Emplacement of fossil groundwaters reflects an apparently ubiquitous phenomenon in margin sediments globally, but our results now identify an unappreciated locus of deep submarine groundwater discharge along active margins with potential implications for coastal biogeochemical processes and tectonic instability.
俄勒冈州近海卡斯卡迪亚边缘水合物岭大量天然气水合物形成对天然气水合物系统水同位素分馏的影响
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