| 准噶尔盆地南缘二叠—三叠纪原型盆地性质与沉积环境演化 |
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| 引用本文： | 庞志超,焦悦,袁波,王家林,魏凌云,唐雪颖,周彦希,吴朝东.准噶尔盆地南缘二叠—三叠纪原型盆地性质与沉积环境演化[J].地质学报,2020,94(6):1813-1838. |
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| 作者姓名： | 庞志超 焦悦 袁波 王家林 魏凌云 唐雪颖 周彦希 吴朝东 |
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| 作者单位： | 1) 中国石油新疆油田分公司勘探开发研究院，新疆克拉玛依，834000;2) 北京大学地球与空间科学学院造山带与地壳演化教育部重点实验室，北京，100871；3) 北京大学石油与天然气研究中心，北京，100871 |
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| 基金项目： | 本文为国家科技重大专项（编号2017ZX05008-001）资助的成果。 |
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| 摘 要： | 准噶尔盆地南缘(简称"准南")二叠—三叠纪原型盆地性质与沉积环境演化一直以来备受争议。通过准南6个地层小区18条典型剖面野外实测、岩相和沉积环境分析以及区域地层对比,认为准南西部(88°E以西)和准南东部(88°E以东)二叠—三叠纪在岩石组合、地层序列、沉积特征和沉积环境等方面存在差异:准南西部以碎屑岩、火山岩和火山碎屑岩组合为特征;准南东部以碳酸盐岩、火山岩和碎屑岩组合为特征。准南西部早—中二叠世地层普遍缺失或被埋藏,晚二叠世—早三叠世为陆相冲积扇—扇三角洲的粗碎屑岩沉积,中—晚三叠世发育滨浅湖相细碎屑岩。准南东部晚石炭世发育深水浊流,早—中二叠世以滨浅海相细碎屑岩为主,中二叠世后期以芦草沟组潟湖相油页岩和碳酸盐岩发育为特征;晚二叠世,普遍进入河湖相演化阶段,以细至粗碎屑岩为主;中—晚三叠世发生湖泛,主要发育三角洲和滨浅湖相碎屑岩。研究表明,准南及邻区二叠—三叠纪为裂谷盆地,经历了断陷—坳陷沉积演化阶段,准南西部和东部伸展程度的差异性导致沉积特征的不同。
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| 关 键 词： | 准噶尔盆地南缘 岩石类型 沉积环境 裂谷盆地 断陷—坳陷 |
| 收稿时间： | 2020/4/16 0:00:00 |
| 修稿时间： | 2020/5/5 0:00:00 |
Permian- Triassic depositional environmental evolution and the prototype basin of the southern Junggar Basin |
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| PANG Zhichao,JIAO Yue,YUAN Bo,WANG Jialin,WEI Lingyun,TANG Xueying,ZHOU Yanxi,WU Chaodong.Permian- Triassic depositional environmental evolution and the prototype basin of the southern Junggar Basin[J].Acta Geologica Sinica,2020,94(6):1813-1838. |
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| Authors: | PANG Zhichao JIAO Yue YUAN Bo WANG Jialin WEI Lingyun TANG Xueying ZHOU Yanxi WU Chaodong |
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| Institution: | 1) Research Institute of Exploration and Development, Xinjiang Oilfield Company,PetroChina, Karamay, Xinjiang, 834000;2) Key Laboratory of Orogenic Belts and Crustal Evolution, Ministry of Education,School of Earth and Space Sciences, Peking University, Beijing, 100871;3) Institute of Oil & Gas, Peking University, Beijing, 100871 |
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| Abstract: | A comparsion of regional stratigraphy, typical measured sections, lithofacies and depositional environments suggests that the western and eastern part of the southern Junggar Basin (roughly along 88°E) have distinctively different rock assemblages, stratigraphic sequences, sedimentary characteristics, and depositional environments. The western part of the southern Junggar Basin is characterized by the clastic-volcanic-volcaniclastic rock assemblages, while the eastern part is composed mainly of carbonate-volcanic-volcaniclastic rock assemblages. In the western part of the southern Junggar Basin, the Cisuralian-Guadalupian strata are generally absent or deeply buried. The Lopingian-Early Triassic strata are dominated by conglomerates with some sandstones and minor mudstones, revealing features of an alluvial fan system. The Middle-Late Triassic strata are composed principally of fine-grained clastic rocks which are interpreted as belonging to a lacustrine system. The depositional environment in the eastern part of the southern Junggar Basin is interpreted as a deep-water turbidite in the Pennsylvanian, followed by a shallow marine environment in the Cisuralian-Guadalupian. In the Guadalupian Lucaogou Formation, the oil shale and carbonate rock are broadly exposed in the Bogda Mountains, suggesting occurrence of a rifting-drifting tectonic cycle in this period. Subsequently, the whole Junggar Basin is characterized by the fluvial and lacustrine systems from the Lopingian, which consist mainly of fine to corase-grained clastic rocks. In the Middle-Late Triassic, the drainage system had expanded with a levelled process, and the eastern part of the southern Junggar Basin is composed mainly of deltaic and shallow lacustrine clastic rocks. This study shows that the Permian-Triassic sediments in the southern Junggar Basin and the adjacent regions are dominated by rifted and depressional sedimentation, but there are differences between the western and eastern part of the southern Junggar Basin in their rift level. |
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