Development characteristics of volcanic tuff of the Wufeng-Longmaxi Formations in Xianfeng area of western Hubei and its influence on enrichment of organic matter in shale
LUO Fan1, DUAN Ke1,3, ZHANG Hao2, XU Lulu1, WANG Yi1, CHEN Wei1, YANG Jie1
1 Hubei Geological Survey,Wuhan 430034,China; 2 Hubei Coal Geological Exploration Institute,Wuhan 430070,China; 3 Key Laboratory of Paleontology and Geological Environment Evolution of Hubei Province,Wuhan 430205,China
Abstract：The organic-rich shale of Wufeng Formation and Longmaxi Formation in Xianfeng area of western Hubei Province contains multilayer volcanic tuff,but the internal relationship between volcanic activity and organic matter enrichment in marine shels has not been systematically studied. Based on the core and outcrop data of Well XY 1 in Xianfeng area,the organic-rich mud shale and volcanic tuff of Wufeng-Longmaxi Formations were systematically sampled,rock and ore identification,trace element,rare earth element and organic carbon content(TOC)tests were carried out,and the distribution characteristics,source rock composition,tectonic setting and genetic mechanism of volcanic tuff of Wufeng-Longmaxi Formations were expounded. The volcanic activity in this sedimentary period and its influence on the enrichment of organic matter in shale are discussed. The results show that the Wufeng-Longmaxi Formations can be divided into dense,sub-dense and undeveloped tuff segments. The primary magmatic properties of the tuff were mainly neutral andesite,and the volcanic ash originates from the volcanic eruption event of the island arc formed by the collision between the northern margin of the Yangtze and the ancient Qinling Ocean. Volcanic ash was an important material source in the Middle Yangtze Retention Basin where terrigenous detritus supply was insufficient in Late Ordovician and Early Silurian. On one hand,volcanic ash provided abundant nutrients for the growth of marine microorganisms and improved the marine palaeoproductivity. On the other hand,volcanism promoted the formation of anoxic environment in the ocean,which was conducive to the burial and preservation of organic matter. The results can provide basic geological data for further exploration of shale gas in the Wufeng-Longmaxi Formations in western Hubei Province.
LUO Fan,DUAN Ke,ZHANG Hao et al. Development characteristics of volcanic tuff of the Wufeng-Longmaxi Formations in Xianfeng area of western Hubei and its influence on enrichment of organic matter in shale[J]. JOPC, 2024, 26(5): 1058-1071.
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