沉积学报2012，Vol.30Issue(3)：501-510,10.
塔里木盆地西北缘乌恰地区晚白垩世—渐新世微相分析及沉积演化
Sedimentary Evolution and Microfacies Analysis of the Late Cretaceous Oligocene from Wuqia Area in the Northwestern Tarim Basin
摘要
Abstract
The evolution of the New Tethys has been attracting the interest of many geologists around the world for it separated Eurasia and Gondwana during the Mesozoic era.In addition to creating the Alps-Himalayan orogenic system,the diminishing and closing of the New Tethys may have played a major role in changing the Cenozoic global climate and causing the Asian inland aridity.The Tarim Basin is one of the few areas in China where Meso-Cenozoic marine strata are exposed.In this study,Kuzigongsu section of Late Cretaceous to Oligocene strata is selected to investigate the lithology and biological assemblage,particle composition and substrate type as well as sedimentary structure of the Late Cretaceous to Oligocene marine stratum by means of sedimentary microfacies analysis.Focusing on carbonate rocks,nine main types of carbonate-facies in the section canbe recognized,including debris cryptocrystal limestone,cryptocrystal limestone,microcrystalline（cryptocrystalline） dolomite,bird＇s eye cryptocrystal limestone,microcrystalline oosparite dolomite,bioclastic limestone,microcrystalline spherulite dolomite,bio-limestone,and sparite oosparite limestone.Combining with sedimentary characteristics of the section,we identify five sedimentary facies（supratidal zone,intertidal zone,sublittoral zone,shallow of platform edge,and reefs） and restore the sedimentary evolution process from the late Cretaceous to Oligocene in the section.Based on the distribution of sedimentary facies and the regional information,there are five cycles of marine transgression along the northwestern margin of Tarim Basin from the Cretaceous to Paleogene.Three large-scale transgression are found in Kukebai group,Qimugen group and Kalataer group and two small-scale transgression are found in Yigeziya group and the late of Bashenbulake group.No numerous marine paleontology fossils are found in the strata lying above the oyster layer in the uppermost part of Bashenbulake Formation,which implicate that the New Tethys finally retreat from the northwestern margin of Tarim Basin in Oligocene at the top of Bashibulake Formation.Thus,these will surely provide some references for finding out evolution of the Tethys Ocean from the Cretaceous to Oligocene and reconstructing regional paleoenvironment of Tarim Basin.关键词
塔里木盆地西北缘/晚白垩世—渐新世/碳酸盐岩微相/沉积演化Key words
northwestern margin of Tarim Basin/Late Cretaceous to Oligocene/carbonate microfacies/sedimentary evolution分类
天文与地球科学引用本文复制引用
张曼,吴小斌,闫宝华,吴松,孟庆泉,方小敏,宋春晖..塔里木盆地西北缘乌恰地区晚白垩世—渐新世微相分析及沉积演化[J].沉积学报,2012,30(3):501-510,10.基金项目
国家973重点基础研究发展计划项目 （）
国家自然科学基金项目 （）
国家教育部博士点基金资助项目（编号：20090211120027）的资助,致谢在野外工作中得到了中国地质科学院地质研究所郭宪璞研究员和中石化石油勘探开发研究院西部分院原总工程师叶留生先生的具体指导,以及兰州大学孟昌、杨进云、魏引杰、王雪鹏等的帮助.室内样品测试分析由兰州大学西部环境教育部重点实验室完成.同时审稿人提出了很好的建设性意见.在此谨向上述单位和个人深表谢意. （）
