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Petrology and geochemistry of cold seep carbonates from the northern Okinawa Trough,East China Sea:implications to early diagenesis

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Journal of Oceanology and Limnology 2022年第4期40卷 1388-1403页

作者： Kehong YANG Zhimin ZHU Yanhui DONG Weiyan ZHANG Fengyou CHU Key Laboratory of Submarine Geosciences&Second Institute of Oceanography Ministry of Natural ResourcesHangzhou 310012China

carbonate samples were collected from the northern Okinawa Trough in the East China Sea in 2013.The petrology,mineralogy,carbon and oxygen isotopes,and rare earth elements(REEs)of these samples were analyzed.Aragonite,high-Mg calcite,and dolomite were the main carbonate minerals,the contents of which varied greatly among the carbonate samples.Petrological observations revealed the common occurrence of framboidal pyrites.Theδ^(13)C values of carbonates varied from-53.7‰to-39.3‰(average of-47.3‰based on Vienna Pee Dee Belemnite(V-PDB),n=9),and theδ^(18)O values ranged from 0.6‰to 3.4‰(average of 1.9‰;V-PDB,n=9).The carbon and oxygen isotope characteristics indicated that the carbonates precipitated during the anaerobic oxidation of methane.The carbon source was a mixture of thermogenic methane and biogenic methane,possibly with a greater contribution from the former.The oxygen isotope data showed that gas hydrate dissociation occurred during carbonate precipitation.The Ce anomalies suggested that the carbonates precipitated in an anoxic environment.A slight enrichment of middle REEs(MREEs)could be attributable to the early diagenesis.The structures,minerals,oxygen isotopes,and MREEs all indicated that the carbonates experienced some degree of early diagenesis.Therefore,the infl uence of early diagenesis should be considered when using geological and geochemical proxies to reconstruct original methane seepage environments.

关键词： authigenic carbonate carbon and oxygen isotopes rare earth elements(REEs) anaerobic oxidation of methane(AOM) northern Okinawa Trough

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Microbes mediated comprehensive carbon sequestration for negative emissions in the ocean

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National Science Review 2020年第12期7卷 1858-1860页

作者： Nianzhi Jiao Jihua Liu Fanglue Jiao Quanrui Chen Xiaoxue Wang State Key Laboratory of Marine Environmental Science and College of Ocean and Earth Sciences Xiamen University Joint Lab for Ocean Research and Education (LORE) of Dalhousie University Canadaand Shandong University and Xiamen University Institute of Marine Science and Technology Shandong University South China Sea Institute of Oceanology Chinese Academy of Sciences

The crisis of the COVID-19 pandemic is warning of a more profound crisis—climate change.Since the Industrial Revolution,anthropogenic activities,such as the burning of fossil fuels and deforestation,have led to a significant increase in atmospheric CO;concentration,exacerbating climate change and causing ecosystem imbalances,abrupt ecosystem successions and serious ecological disasters,which will finally threaten the sustainable development of human society.

关键词： authigenic carbonate SEA

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