| 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 |
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| 引用本文： | 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. |
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| 作者姓名： | 张曼 吴小斌 闫宝华 吴松 孟庆泉 方小敏 宋春晖 |
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| 作者单位： | 1. 兰州大学地质科学与矿产资源学院,兰州,730000
2. 中国科学院青藏高原研究所,北京,100085 |
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| 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( |
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| 摘 要： | 塔里木盆地西部是我国发育中新生代海相地层的少数地区之一。以沉积微相分析为手段，通过对塔里木盆地西北缘乌恰地区库孜贡苏剖面晚白垩世-古近纪岩性、生物组合、颗粒成分、基质类型及其沉积结构和构造特征等仔细研究，重点针对碳酸盐岩划分出（含）骨屑隐晶灰岩、隐晶灰岩、微（隐）晶白云岩、鸟眼隐晶灰岩、微晶鲕粒白云岩、生物碎屑灰岩、微晶球粒白云岩、生物灰岩、亮晶鲕粒灰岩等9个岩相类型。根据碳酸盐岩微相类型组合和剖面结构沉积特征，划分出潮上带、潮间带、潮下带、台地边缘浅滩和生物礁5个沉积相，并恢复了该区晚白垩世-古近纪的沉积环境演化过程，为查清白垩纪-古近纪特提斯洋演化以及重建该地区古环境和油气勘探研究提供重要的基础材料。
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| 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 |
Sedimentary Evolution and Microfacies Analysis of the Late Cretaceous Oligocene from Wuqia Area in the Northwestern Tarim Basin |
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| ZHANG Man,WU Xiao-bin,YAN Bao-hua,WU Song,MENG Qing-quan,FANG Xiao-min,SONG Chun-hui.Sedimentary Evolution and Microfacies Analysis of the Late Cretaceous Oligocene from Wuqia Area in the Northwestern Tarim Basin[J].Acta Sedimentologica Sinica,2012,30(3):501-510. |
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| Authors: | ZHANG Man WU Xiao-bin YAN Bao-hua WU Song MENG Qing-quan FANG Xiao-min SONG Chun-hui |
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| Institution: | 1(1.School of Earth Sciences,Lanzhou University,Lanzhou 730000; 2.Institute of Tibetan Plateau Research,Chinese Academy of Sciences,Beijing 100085) |
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| 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. |
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| Keywords: | northwestern margin of Tarim Basin Late Cretaceous to Oligocene carbonate microfacies sedimentary evolution |
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