Effects of palaeogeographic environment on volcano eruption style: Example from the Lower Permian Fengcheng Formation in eastern Mahu sag,Junggar Basin
He Yan-Xin1, Xian Ben-Zhong1, 2, Niu Hua-Peng1, 2, Liu Jian-Ping1
1 College of Geosciences,China University of Petroleum(Beijing),Beijing 102249; 2 State Key Laboratory of Petroleum Resource and Prospecting,China University of Petroleum(Beijing),Beijing 102249;
Abstract The eruption style transition of modern volcanoes often occurred,due to the changes of magma or ambient environment in nature. This paper tries to explore the probable influences of palaeogeographic environment on volcano eruption style in the sedimentary basin. Based on data from seismic,drilling,logging and core,the palaeogeographic environment and distribution of volcanic rocks in the Lower Permian Fengcheng Formation in eastern Mahu sag,Junggar Basin,were analyzed. The petrological and geochemical characteristics of cored volcanic rocks were studied by core observation,thin section observation,SEM(scanning electron microscope),major element analysis and EPMA(electron probe microanalysis). The results showed that:(1)There are mainly four types of volcanic rock and three types of lithological association. Two kinds of eruption style,phreatomagmatic eruption and magmatic eruption,are recognized. (2)In detail,phreatomagmatic eruption is characterized by peperite,accretionary lapilli and welded tuff developed with bread-crusted texture,welded texture and welded perlitic texture. While,magmatic eruption is characterized by accretionary lapilli-bearing lava caused by the cementation of earlier accretionary lapilli. (3)The evolution of palaeogeographic environment near vent controlled the eruption style,which then influenced the characteristics of eruptive products. Phreatomagmatic eruption caused by magma and enough water interaction occurred when palaeogeographic environment was subaqueous. Effusive magmatic eruption happened when palaeogeographic environment was subaerial. The major reason of palaeogeographic environment changes probably were related to the accumulation of eruptive products near vent or lake level changes caused by seasonal weather change in the core intervals. (4)Therefore palaeogeographic environment had significant influences on eruption style,eruptive process and features of eruptive products. That could provide a new viewpoint for genetic analysis of volcanic rocks and eruptive process rebuilding,and also provide a new idea for exploration and development of volcanic petroleum reservoirs.
Fund:[Co-funded by the National Natural Science Foundation of China(Nos.41172104,41372117,41272133),the National Science and Technology Major Project(Nos. 2011ZX05009-002,2011ZX05014-001)and the Foundation of China University of Petroleum(Beijing)(No. KYJJ2012-01-06)]
Corresponding Authors:
Xian Ben-Zhong,born in 1973,is an associate professor of China University of Petroleum(Beijing). He is mainly engaged in researches on volcanic reservoir and gravity flow. E-mail: xianbzh@cup.edu.cn.
About author: He Yan-Xin,born in 1993,is a master candidate of China University of Petroleum(Beijing). He is mainly engaged in research on volcanic reservoir. E-mail: Heyx1993@126.com.About the corresponding author Xian Ben-Zhong,born in 1973,is an associate professor of China University of Petroleum(Beijing). He is mainly engaged in researches on volcanic reservoir and gravity flow. E-mail: xianbzh@cup.edu.cn.
Cite this article:
He Yan-Xin,Xian Ben-Zhong,Niu Hua-Peng et al. Effects of palaeogeographic environment on volcano eruption style: Example from the Lower Permian Fengcheng Formation in eastern Mahu sag,Junggar Basin[J]. JOPC, 2018, 20(2): 245-262.
He Yan-Xin,Xian Ben-Zhong,Niu Hua-Peng et al. Effects of palaeogeographic environment on volcano eruption style: Example from the Lower Permian Fengcheng Formation in eastern Mahu sag,Junggar Basin[J]. JOPC, 2018, 20(2): 245-262.
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