Records of past methane discharges from Holocene cold seeps of Hidaka Trough based on carbon isotope values of benthic foraminifera

IF 3.6 2区地球科学 Q1 GEOCHEMISTRY & GEOPHYSICS

Chemical Geology Pub Date : 2024-12-30 DOI:10.1016/j.chemgeo.2024.122608

Mahsa Saeidi Ortakand, Hitoshi Tomaru, Ryo Matsumoto

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引用次数: 0

Abstract

Hidaka Trough, a marine hydrate reservoir in the northwestern Pacific, is characterized by its gas chimney structures, faults, methane plumes, and degassing structures, providing pathways for the upward migration of free hydrocarbon gases from deep sediments to the seabed. A comprehensive understanding of methane emissions from Hidaka Trough sediments in the past and present holds the key to predicting future scenarios of methane emission. This study applied a multi-proxy approach to three sediment cores (PC1609, PC1611, and PC1727) from cold seep regions of the Hidaka Trough in the northwestern Pacific to reconstruct the local history of methane emissions. The chronostratigraphic framework of the cores was established using accelerator mass spectrometry (AMS) radiocarbon dates and δ18O profiles of benthic foraminifera, indicating that the cores were deposited during the Holocene. The geochemical composition of hydrocarbon gases within the sediments suggested a microbial origin or a mixture of microbial and thermogenic gases.

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基于底栖有孔虫碳同位素值的Hidaka海槽全新世冷渗漏甲烷排放记录

西北太平洋海相水合物储层Hidaka槽具有气烟囱构造、断裂、甲烷羽流和脱气构造等特征，为游离烃气体从深部沉积物向上运移到海底提供了通道。全面了解Hidaka海槽沉积物过去和现在的甲烷排放是预测未来甲烷排放情景的关键。本研究采用多代理方法对西北太平洋Hidaka海槽冷渗区的3个沉积物岩心（PC1609、PC1611和PC1727）进行了甲烷排放重建。利用加速器质谱（AMS）放射性碳测年和底栖有孔虫的δ18O剖面建立了岩心的年代地层格架，表明岩心沉积于全新世。沉积物中烃类气体的地球化学组成表明其为微生物成因或微生物与热成因气体的混合成因。

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来源期刊

Chemical Geology 地学-地球化学与地球物理

CiteScore

7.20

自引率

10.30%

发文量

374

审稿时长

3.6 months

期刊介绍： Chemical Geology is an international journal that publishes original research papers on isotopic and elemental geochemistry, geochronology and cosmochemistry. The Journal focuses on chemical processes in igneous, metamorphic, and sedimentary petrology, low- and high-temperature aqueous solutions, biogeochemistry, the environment and cosmochemistry. Papers that are field, experimentally, or computationally based are appropriate if they are of broad international interest. The Journal generally does not publish papers that are primarily of regional or local interest, or which are primarily focused on remediation and applied geochemistry. The Journal also welcomes innovative papers dealing with significant analytical advances that are of wide interest in the community and extend significantly beyond the scope of what would be included in the methods section of a standard research paper.