【摘要】 通过对准噶尔盆地南缘及邻区18条野外地质剖面岩层岩性及产状的分析,识别出下石炭统齐尔古斯套群与上石炭统柳树沟组之间、中二叠统红雁池组与上二叠统泉子街组之间、下三叠统上仓房沟群与中上三叠统小泉沟群之间、中上三叠统小泉沟群与中下侏罗统水西沟群之间、中下侏罗统水西沟群与中侏罗统头屯河组之间、上侏罗统喀拉扎组与下白垩统之间、上白垩统东沟组与古新统紫泥泉子组之间、中新统塔西河组与上新统独山子组之间及上新统独山子组与第四系之间9个区域不整合界面,大多为角度不整合接触关系。测井曲线、地震剖面等地球物理证据及泥岩样品主微量元素、砂岩碎屑成分、碎屑岩微量元素、砂岩重矿物成分等地球化学证据证明了这9个不整合界面的存在,为准确合理划分研究区构造层序及构造阶段、确定研究区不同阶段成盆作用及改造作用提供了依据。图9参31更多还原

【Abstract】 The analysis of the south margin of the Junggar Basin and the rock lithologies and attitudes of 18 field geologic sections in its adjacent area reveals that 9 regional unconformities,dominantly angular unconformities,exist between Lower Carboniferous Qiergusi Group and Upper Carboniferous Liushugou Formation,Middle Permian Hongyanchi Formation and Upper Permian Quanzijie Formation,Lower Triassic Shangcangfanggou Group and Middle-Upper Triassic Xiaoquangou Group,Middle-Upper Triassic Xiaoquangou Group and Middle-Lower Jurassic Shuixigou Group,Middle-Lower Jurassic Shuixigou Group and Middle Jurassic Toutunhe Formation,Upper Jurassic Kalazha Formation and Lower Cretaceous,Upper Cretaceous Donggou Formation and Paleocene Ziniquanzi Formation,Miocene Taxihe Formation and Pliocene Dushanzi Formation,Pliocene Dushanzi Formation and Quaternary.The occurrence of these unconformities are justified by geophysical evidences of logging curve and seismic profile and by geochemical evidences of trace elements and rare elements in mudstone samples,sandstone detrital composition,rare elements in clastic rocks,and heavy mineral composition and so on.These unconformities pave the way for the accurate division of tectonic sequences and stages and for determining basin forming processes in different stages.更多还原