Impacts of volcanic activity on sedimentary palaeo-environment and organic matter enrichment
XIE Haoran1, LIANG Chao1,2, WU Jing3, JI Shichao1
1 School of Geosciences,China University of Petroleum(East China),Shandong Qingdao 266580,China; 2 State Key Laboratory of Deep Oil and Gas(China University of Petroleum(East China)),Shandong Qingdao 266580,China; 3 School of Earth Science and Engineering,Shandong University of Science and Technology,Shandong Qingdao 266590,China
Abstract Volcanic activity greatly affected the palaeoecological environment and biological evolution process. This study focuses on examining the volcanic activity records during the Ordovician/Silurian period in the Yangtze area. We incorporates the volcanic activity records from the Junggar Basin,Ordos Basin,and Santanghu Basin,as well as modern volcanic activities worldwide to elucidate the influence mechanism of volcanic activity on sedimentary palaeo-environment and organic matter enrichment. Tuff,sedimentary tuff,bentonite and tuffaceous sedimentary rocks formed in geological history are good proxy of volcanic activities. Through the analysis of the petrology,mineralogy and geochemical characteristics from macro-to micro-scale,this study established a comprehensive judgment method of multi-angle assessment of volcanic activity in the section core-microstructure-whole rock minerals-geochemistry. The nutrient elements released by volcanic activities lead to the proliferation of marine organisms and the increase of primary productivity,which is conducive to the accumulation of organic matter,while toxic substances impede the survival of organisms and reduce primary productivity. The relative amounts of nutrients and toxins released by volcanic activity may affect the primary productivity of the ocean. Low intensity volcanic activity can promote biological reproduction,while intense volcanic activity constantly increases the pressure of ecological environment restoration,ultimately resulting in irreversible damage. Volcanic activity intensifies water body hypoxia and enhances organic matter preservation efficiency. Sulphuric acid aerosols derived from volcanic gases increase planetary albedo and lower surface temperatures.
Fund:Co-funded by the National Natural Science Foundation of China(Nos.42172165,41902134),the Fundamental Research Funds for the Central Universities(No.22CX06001A)and the Taishan Scholars Program(No. TSQN201812030)
Corresponding Authors:
LIANG Chao,born in 1986,Ph.D.,professor,is engaged in sedimentology and reservoir geology research. E-mail: liangchao0318@163.com.
About author: XIE Haoran,born in 1998,doctoral candidate,is engaged in sedimentology research. E-mail: xiehaoran2016@163.com.
Cite this article:
XIE Haoran,LIANG Chao,WU Jing et al. Impacts of volcanic activity on sedimentary palaeo-environment and organic matter enrichment[J]. JOPC, 2023, 25(4): 768-787.
XIE Haoran,LIANG Chao,WU Jing et al. Impacts of volcanic activity on sedimentary palaeo-environment and organic matter enrichment[J]. JOPC, 2023, 25(4): 768-787.
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