青海省乐都县引胜沟一带早侏罗世大西沟组特征及意义研究

摘要

研究区位处北祁连造山带与中祁连地块接壤,属秦祁昆地层大区.区内出露地层有元古代变质地层、早古生代海相火山-沉积地层以及新生代陆相地层.通过填图及剖面调查对引胜沟一带早侏罗世大西沟组特征进行研究,与区域上地层进行对比研究,确定其时代为早侏罗世.%Northern Qilian orogenic belt is adjacent to the middle Qilian area,which is a large area of the Qinqi Kunshan formation.The outcrops in the area covers the ancient metamorphic stratum,Paleozoic Mesozoic volcano -sedimentary strata and new generation of land facies.In this article,through the mapping and profile survey,we have received a lot in early Jurassic XiGou group characteristics to compare with regional stratigraphic research,as determines its time to early Jurassic.