Coupled δ^(15)N_(TN) and δ^(13)C_(TOC) Insights into Methane Seepage Activities in Bulk Marine Sediments of the Qiongdongnan Basin, South China Sea

作     者：MIAO Xiaoming FENG Xiuli HU Limin LI Jingrui LIU Xiting WANG Nan XIAO Qianwen WEI Jiangong MIAO Xiaoming;FENG Xiuli;HU Limin;LI Jingrui;LIU Xiting;WANG Nan;XIAO Qianwen;WEI Jiangong

作者机构：College of Marine GeosciencesOcean University of Chinathe Key Laboratory of Submarine Geosciences and Prospecting TechniquesQingdao 266100China Deep-Sea Multidisciplinary Research Center&Laboratory for Marine GeologyQingdao National Laboratory for Marine Science and TechnologyQingdao 266037China MLR Key Laboratory of Marine Mineral ResourcesGuangzhou Marine Geological SurveyGuangzhou 510075China Southern Marine Science and Engineering Guangdong Laboratory(Guangzhou)Guangzhou 511458China 

出 版 物：《Journal of Ocean University of China》 (中国海洋大学学报（英文版）)

年 卷 期：2022年第21卷第6期

页      面：1495-1503页

核心收录：

学科分类：070902[理学-地球化学] 0709[理学-地质学] 07[理学] 0707[理学-海洋科学] 

基　　金：supported by the National Key R&D Program of China(No.2017YFC0306703) the Key Special Project for Introduced Talents Team of Southern Marine Science and Engineering Guangdong Laboratory(Guangzhou)(No.GML2019 ZD0201) 

主　　题：methane seepage TS/TOC nitrogen isotopes organic carbon isotopes South China Sea 

摘      要：Recently,methane seepage related to the dissociation of natural gas hydrates has attracted much attention,which has a significant impact on the study of the global carbon and nitrogen *** on the detailed geochemical analyses of sediments(core Q6)from the Qiongdongnan Basin,South China Sea,three methane seepage activities were identified and the exact horizons of anaerobic oxidation of methane(AOM)were ***,organic carbon isotopic(δ^(13)C_(TOC))levels ranged from−23.6‰–−20.6‰PDB;nitrogen isotopes(δ^(15)N_(TN))of the same sedimentary samples ranged from 1.8‰–5.3‰.We also found obvious simultaneous negative excursions of organic carbon isotopes(δ^(13)C_(TOC))and nitrogen isotopes(δ^(15)N_(TN))in the horizons of methane *** with the normal sediments,their maximum negative excursions were 2.6‰and 2.5‰,*** discuss in detail the various characteristics ofδ^(15)N_(TN) andδ^(13)C_(TOC) levels in sediments and their coupling responses to methane seepage *** believe that the methane seepage events changed the evolution trajectory ofδ^(15)N_(TN) andδ^(13)C_(TOC) levels in sediment records,which resulted in the simultaneous negative *** phenomenon is of great significance to reveal the historical dissociation of natural gas hydrates and their influence on the deep-sea carbon and nitrogen pool.