超深海沉积物中地震增强的溶解碳循环。

Earthquake-enhanced dissolved carbon cycles in ultra-deep ocean sediments.

作者信息

Chu Mengfan, Bao Rui, Strasser Michael, Ikehara Ken, Everest Jez, Maeda Lena, Hochmuth Katharina, Xu Li, McNichol Ann, Bellanova Piero, Rasbury Troy, Kölling Martin, Riedinger Natascha, Johnson Joel, Luo Min, März Christian, Straub Susanne, Jitsuno Kana, Brunet Morgane, Cai Zhirong, Cattaneo Antonio, Hsiung Kanhsi, Ishizawa Takashi, Itaki Takuya, Kanamatsu Toshiya, Keep Myra, Kioka Arata, McHugh Cecilia, Micallef Aaron, Pandey Dhananjai, Proust Jean Noël, Satoguchi Yasufumi, Sawyer Derek, Seibert Chloé, Silver Maxwell, Virtasalo Joonas, Wang Yonghong, Wu Ting-Wei, Zellers Sarah

机构信息

Frontiers Science Center for Deep Ocean Multispheres and Earth System, and Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, Ocean University of China, Qingdao, 266100, China.

University of Innsbruck, Institute of Geology, Innsbruck, Austria.

出版信息

Nat Commun. 2023 Sep 11;14(1):5427. doi: 10.1038/s41467-023-41116-w.

DOI:10.1038/s41467-023-41116-w

PMID:37696798

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC10495447/

Abstract

Hadal trenches are unique geological and ecological systems located along subduction zones. Earthquake-triggered turbidites act as efficient transport pathways of organic carbon (OC), yet remineralization and transformation of OC in these systems are not comprehensively understood. Here we measure concentrations and stable- and radiocarbon isotope signatures of dissolved organic and inorganic carbon (DOC, DIC) in the subsurface sediment interstitial water along the Japan Trench axis collected during the IODP Expedition 386. We find accumulation and aging of DOC and DIC in the subsurface sediments, which we interpret as enhanced production of labile dissolved carbon owing to earthquake-triggered turbidites, which supports intensive microbial methanogenesis in the trench sediments. The residual dissolved carbon accumulates in deep subsurface sediments and may continue to fuel the deep biosphere. Tectonic events can therefore enhance carbon accumulation and stimulate carbon transformation in plate convergent trench systems, which may accelerate carbon export into the subduction zones.

摘要

海沟是位于俯冲带的独特地质和生态系统。地震引发的浊积岩是有机碳（OC）的有效传输途径，但这些系统中有机碳的再矿化和转化尚未得到全面了解。在这里，我们测量了国际大洋发现计划（IODP）386航次期间沿日本海沟轴采集的地下沉积物间隙水中溶解有机碳和无机碳（DOC、DIC）的浓度以及稳定碳和放射性碳同位素特征。我们发现地下沉积物中DOC和DIC的积累和老化，我们将其解释为地震引发的浊积岩导致不稳定溶解碳的产量增加，这支持了海沟沉积物中强烈的微生物甲烷生成。残留的溶解碳在深部地下沉积物中积累，并可能继续为深层生物圈提供养分。因此，构造事件可以增强板块汇聚海沟系统中的碳积累并刺激碳转化，这可能加速碳向俯冲带的输出。