在对野外露头和钻孔资料分析基础之上,运用单因素分析多因素综合作图法,对滇东南地区晚二叠世吴家坪早期的岩相古地理进行了系统研究和编图,取得如下主要认识:(1)吴家坪早期研究区西部为康滇古陆,西南部为屏马-越北古陆,沉积相带自南西向北东展布,依次为沼泽-潮上带、潮间带、潮下带和局限浅海；(2)康滇古陆与屏马-越北古陆共同为研究区提供物源；(3)天生桥地区在晚二叠世吴家坪早期沉积厚度较大,构成盆地的沉积中心；(4)盆地中心位于研究区的东北部,水体较深；(5)滇东南地区铝土矿主要分布于潮下带和局限浅海上部,该相带发育的地区应是今后滇东南地区的主要找矿远景区.%Based on the quantitative and qualitative data of outcrops and well sections, according to the single factor analysis and multifactor comprehensive mapping method, the lithofacies palaeogeography of the Late Permian early Wuchiapingian in Wenshan, southeastern Yunnan Province, was studied and mapped. The research results are as following; (1) The Kangdian old land and the Pingma-North Vietnam old land was located to the western and southeastern of Wenshan during the Late Permian Wuchiapingian Age, and the sedimentary facies was distributed successively from the southwest to the northeast, including swamp-supratidal, intertidal, subtidal and restricted shallow sea facies; (2) The Kangdian old land and the Pingma-North Vietnam old land were the common material sources provider; (3) The sediments of Tianshengqiao area were deposited with large thickness, which constituted the depocenter; (4) The basin topographic center was located in the northeast of the study area; (5) Bauxites were mainly deposited in subtidal and restricted shallow sea area, and these sedimentary facies area should be the main perspective area for ore exploration.
展开▼
