| 余姚—丽水断裂带嵊州地区燕山期主要构造特征 |
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| 作者姓名： | 褚平利 陈荣 曾剑威 廖圣兵 杨祝良 |
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| 作者单位： | 中国地质调查局南京地质调查中心,南京 210016 |
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| 基金项目： | 中国地质调查局“浙江1:5万崇仁镇、长乐镇、岭口、巍山镇幅区域地质调查(编号: 121201008000150002)”“武夷山成矿带龙泉—上杭地区地质矿产调查(编号: 12120113064800)”、国家重点研发计划课题“东南沿海中生代巨型火山构造成因与成矿(编号: 2016YFC0600203)”和地质矿产调查评价专项“国家地质数据库建设与整合(编号: DD20179384)”联合资助 |
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| 摘 要： | 余姚—丽水断裂带是浙东南地区活动时间长、延伸远、发育比较宽的一条NE—NNE展布的断裂构造带,在浙江嵊州地区上火山岩系磨石山群和下火山岩系永康群中构造形迹表现十分明显。余姚—丽水断裂带由一系列NE—NNE向控制区内白垩纪盆地形成与发展的正断层,以及NE—NNE走向、自北西向南东逆冲的叠瓦状断层和轴迹呈NE—NNE向的褶皱组成。通过对其构造活动特征及控制新老地层的时序关系研究,结合区域构造活动规律和时空演化关系等综合分析认为: 正断层形成时间较早,控制白垩纪盆地的形成和发展,与早白垩世岩石圈伸展减薄形成的拉张作用密切相关; 叠瓦状逆冲断层及斜歪褶皱、紧闭同斜褶皱等褶、断构造组合形成于晚白垩世之后,其动力学机制可能与古太平洋构造域向太平洋构造域的转换效应有关。研究成果为深入探讨浙东地区燕山期构造演化提供了新的素材和资料。
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| 关 键 词： | 余姚— 丽水断裂带 褶皱 断层 嵊州地区 |
| 收稿时间： | 2018-02-05 |
Characteristics of main Yanshanian structures in Yuyao-Lishui fault zone of Shengzhou area |
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| Authors: | CHU Pingli CHEN Rong ZENG Jianwei LIAO Shengbing YANG Zhuliang |
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| Institution: | Nanjing Center, China Geological Survey, Nanjing 210016, China |
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| Abstract: | Yuyao-Lishui fault zone is a NE-NEE fault zone with the characteristics of long activity time, far extension and wide development in the southeast of Zhejiang Province. The structural features of the fault zone are very obvious in Moshishan Group of Upper Volcanic Series and Yongkang Group of Lower Volcanic Series, which are located in Shengzhou area of Zhejiang. The Yuyao-Lishui fault zone is composed of a series of NE-NNE normal faults, NE-NNE thrust faults and the folds with NE-NNE axial trace. The normal faults control the formation and development of Cretaceous basin in the study area, and the thrust faults are multi-level imbricate from NW to SE. Through the research of structural activity characteristics and time series of controlling new and old strata, combining with the comprehensive analysis of regional structural activity regularity and temporal and spatial evolution relationship, the authors considered that the normal faults, controlling the formation and development of Cretaceous basin, have formed in earlier times and are closely related to the lithosphere extension in Early Cretaceous, the imbricate thrust faults combined with the fold structure (as inclined folds and closed homoclinal folds) after Late Cretaceous, may be related to the transformation from the Paleo-Pacific tectonic domain to the Pacific tectonic domain. The results could provide the new data for investigating the evolution of Yanshanian tectonics in East Zhejiang. |
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| Keywords: | Yuyao-Lishui fault zone fold fault Shengzhou area |
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