| 扬子北缘南华纪裂谷系统:基于重力异常及沉积学证据 |
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| 引用本文： | 李路顺,汪泽成,肖安成,杨高印,姜华,苏楠,吴磊,师平平,王依平.扬子北缘南华纪裂谷系统:基于重力异常及沉积学证据[J].地球科学,2021,46(10):3496-3508. |
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| 作者姓名： | 李路顺 汪泽成 肖安成 杨高印 姜华 苏楠 吴磊 师平平 王依平 |
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| 作者单位： | 1.浙江大学地球科学学院, 浙江省地学大数据与地球深部资源重点实验室, 浙江杭州 310027 |
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| 基金项目： | 中国石油天然气股份有限公司勘探开发研究院项目RIPED-2019-JS-698国家"十三五"重大专项2017ZX05008-001深层古老含油气系统成藏规律与目标评价项目2017ZX05008-005 |
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| 摘 要： | 南华纪华南发育一系列裂谷及其相关的沉积盆地，在扬子地块的西部康滇地区、中部四川盆地及东部湘桂地区皆有裂谷盆地的直接证据.扬子地块北缘大巴山地区地形复杂、研究基础薄弱，对裂谷盆地是否存在尚未有清楚的认识.该研究有助于正确了解大巴山地区南华纪裂谷的空间展布规律，并对扬子北缘的地球动力学研究提供一定的启示.针对大巴山地区利用重力异常及野外露头资料开展了综合研究，揭示了扬子北缘大巴山南华裂谷的东西向展布形态，裂谷从南秦岭中部延伸到四川盆地东北部.同时构建出裂谷内与裂谷肩的地层充填序列及空间格架.基于上述盆地格架与沉积填充特征，提出大巴山地区弧后裂谷的构造背景.
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| 关 键 词： | 裂谷 南华纪 大巴山 扬子地块 重力异常 盆地填充 沉积学 |
| 收稿时间： | 2020-12-26 |
Rift System in Northern Yangtze Block during Nanhua Period:Implications from Gravity Anomaly and Sedimentology |
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| Li Lushun,Wang Zecheng,Xiao Ancheng,Yang Gaoyin,Jiang Hua,Su Nan,Wu Lei,Shi Pingping,Wang Yiping.Rift System in Northern Yangtze Block during Nanhua Period:Implications from Gravity Anomaly and Sedimentology[J].Earth Science-Journal of China University of Geosciences,2021,46(10):3496-3508. |
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| Authors: | Li Lushun Wang Zecheng Xiao Ancheng Yang Gaoyin Jiang Hua Su Nan Wu Lei Shi Pingping Wang Yiping |
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| Abstract: | A series of rift valleys and their related sedimentary basins were developed in South China during Nanhua period. There are direct evidences of rift valleys in Kangdian area, Sichuan basin and Hunan-Guangxi area. However, there is no clear understanding of the existence of rift basin due to the complex terrain and weak previous studies in the Daba Mountain area. The study of this area is helpful to understand the existence of Nanhua rift in Daba Mountain area and provides some enlightenment for the study of tectonic evolution in northern Yangtze block.In this paper, the gravity anomaly and field outcrop data were used to carry out a comprehensive study in this area. The present distribution pattern of Nanhua rift was revealed in Daba Mountain area, northern Yangtze block, and the stratigraphic filling sequence and spatial framework in and between the rifts were constructed. The study shows that the Daba Mountain rift is east-west trending along Zhushan-Dazhou, extending from the middle of South Qinling to the northeast of Sichuan basin. Based on the basin framework and sedimentary filling characteristics, the tectonic background of the back-arc rift in the Daba Mountain area is proposed, which provides enlightenment for the Neoproterozoic dynamic mechanism in the northern margin of the Yangtze block. |
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