Geochemical Characteristics and Tectonic Significance of the Volcanic Rocks of the Jiangbasitao Formation,Yiwu County,Xinjiang
Based on the investigation of the distribution,genesis and tectonic environment of volcanic rocks in Jiangbasitao Formation,Yiwu County,Xinjiang,the distribution characteristics of volcanic facies from subvolcanic facies to explosive facies to eruptive facies to volcanic sedimentary facies in this period are identified.The volcanic rock association consists of a set of intermediate-basic and intermediate-acid pyroclastic rocks,volcanic lava and volcanic sedimentary rocks of the island arc facies.Combined study on the geochemical characteristics of volcanic rocks and sedimentary rocks,it is concluded that the study area was in the transition dynamic environment of continental rift to oceanic rift in the early early Carboniferous.In the late early Carboniferous period(sedimentary period of the Jiangbasitao Formation),the tectonic activity in the study area changed from extensional mechanism to compressional mechanism,and the volcanic rocks showed island arc volcanic series.The early Carboniferous in the study area evolved into an"open"and"close"structure.
volcanic rock genesisgeochemistrytectonic environmentJiangbasitao Formation
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