内蒙古西部额济纳旗雅干地区二叠系埋汗哈达组的岩石学特征和沉积环境

摘要

The authors studied petrologic characteristics of main rocks by such means as profile measurement of Permian Maihanhada Formation in Yagan area of Ejin Banner, thin section analysis, fossil identification and X-diffraction as well as trace element, clay mineral and heavy mineral analysis. The sedimentary environment of Maihanhada Formation was studied on the basis of lithologic characteristics, palaeophytic fossil, content and ratios of trace elements, and geochemical parameters of gas chromatography on saturated hydrocarbon. It is concluded that the environment of Permiar Maihanhada Formation in Yagan area was an offshore to epeiric sea environment characterized by salt water and reduction.%通过对额济纳旗雅干地区二叠系埋汗哈达组进行剖面实测、室内薄片鉴定、化石鉴定、X-衍射、微量元素、粘土矿物、重矿物等的分析,研究了埋汗哈达组主要岩性的岩石学特征.在此基础上,根据岩性特征、古生物化石、微量元素含量及其比值、饱和烃气相色谱地球化学参数等研究了埋汗哈达组的沉积环境,综合分析认为雅干地区二叠系埋汗哈达组形成于半咸水的滨海-浅海的还原环境.