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| 塔里木盆地西南缘中生代沉积古环境恢复 | |
| 引用本文： | 廖林,程晓敢,王步清,陈汉林,罗俊成,师骏.塔里木盆地西南缘中生代沉积古环境恢复[J].地质学报,2010,84(8):1195-1207. |
| 作者姓名： | 廖林 程晓敢 王步清 陈汉林 罗俊成 师骏 |
| 作者单位： | 1. 浙江大学地球科学系,杭州,310027;教育部含油气盆地构造研究中心,杭州,310027 2. 中石油塔里木油田分公司,新疆库尔勒,841000 3. 中石油塔里木油田分公司,新疆库尔勒,841000;北京大学地球与空间科学学院,北京,100871 |
| 基金项目： | 国家自然科学基金项目，国家重点基础研究发展规划"973"项目(编号2007CB411303)资助成果 |
| 摘 要： | 对塔里木盆地西南缘中生代沉积相和沉积环境的研究,不仅可以了解晚三叠世—晚白垩世塔里木板块南缘活动大陆边缘的历次碰撞事件,也为研究新生代中亚地区强烈的陆内变形活动提供了重要信息。本文利用野外地质调查结果和地球物理资料,在沉积相和地震相分析基础上,重建中生代沉积体系和沉积环境。结果表明:塔里木盆地西南缘中生界的原始分布受晚三叠世弧后前陆冲带冲断作用和造山后伸展作用形成的古地形控制。早侏罗世发育了一系列独立分割的小断陷,以巨厚的冲积扇、辫状河三角洲沉积为特征,其受控于NWW—SEE走向的正断层,而非NW—SE走向的古塔拉斯-费尔干纳右旋走滑断裂;早侏罗世晚期—中侏罗世广泛发育滨浅湖和河流-沼泽相沉积,可能存在一个连通了塔里木盆地南缘、吐拉以及柴达木盆地西缘的统一沉积坳陷;至晚侏罗世,冲积环境再次出现,发育的粗粒碎屑岩为早白垩世湖盆扩张前的产物;早白垩世,丰富的陆源碎屑在古昆仑山前形成多个相互叠置的冲积扇—扇三角洲—扇三角洲平原沉积体;晚白垩世,随着海水自西向东侵入,塔里木盆地西南缘陆相碎屑沉积向东逐渐退却,海相沉积占有优势。 |
| 关 键 词： | 中生代 沉积环境 塔里木盆地西南缘 恢复 |
| 收稿时间： | 1/4/2010 2:32:10 PM |
| 修稿时间： | 2/25/2010 1:22:29 AM |
Reconstruction of Mesozoic sedimentary environment in Southwestern Tarim basin, Northwestern China |
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| liaolin,CHENG Xiao-gan,WANG Bu-qing,CHEN Han-lin,LUO Jun-cheng and SHI Jun.Reconstruction of Mesozoic sedimentary environment in Southwestern Tarim basin, Northwestern China[J].Acta Geologica Sinica,2010,84(8):1195-1207. | |
| Authors: | liaolin CHENG Xiao-gan WANG Bu-qing CHEN Han-lin LUO Jun-cheng and SHI Jun |
| Institution: | Department of Earth Sciences,Zhengjiang University,Department of Earth Sciences, Zhengjiang University,Petroleum Exploration and Development of Tarim Oil Field,CNPC,Department of Earth Sciences, Zhengjiang University,Petroleum Exploration and Development of Tarim Oil Field,CNPC,Petroleum Exploration and Development of Tarim Oil Field,CNPC |
| Abstract: | The study of Mesozoic sedimentary facies and its environments of Southwestern Tarim Bssin will provide information to know collision events in south margins of Tarim block during Triassic to late Jurassic, and also continental deformation in mid-Asia during Cenozoic Era. On the basis of geological survey and geophysical data, Mesozoic sedimentary system and environment have been analyzed. The results indicate that original distribution of Mesozoic sediments was controlled by previous paleo-tomography of late Triassic. A few isolated fault-bounded sages, located along the West Kunlun Range, are the results of NWW-SEE normal faults of early Jurassic but not activity of Talas-Ferghana fault. Sedimentary facies are dominated by alluvial fan, braid river delta. From late early-Jurassic to middle Jurassic, lake, swamp and river were prevailing sedimentary environments. Meanwhile, a possible huge lake linked present Tarim, Tula and west Qaidam basins together. During late Jurassic, alluvial facies were evident again. Early Cretaceous alluvial fans and fan deltas were prevailing along West Kunlun Range. At late Cretaceous, resulting from transgression from west to east in Southwestern Tarim Basin, continental clasts decreased eastwardly, while marine facies took dominance. |
| Keywords: | Mesozoic Sedimentary environment Southwestern Tarim Reconstruction |
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