龙门山中北段构造变形特征新认识——对多层次滑脱变形的指示意义

邓棚; 方成名; 邓铭哲; 赵利

doi:10.11781/sysydz202101045

龙门山中北段构造变形特征新认识——对多层次滑脱变形的指示意义

doi: 10.11781/sysydz202101045

邓棚^{1, 2,},
方成名¹,
邓铭哲¹,
赵利³

1.
中国石化石油勘探开发研究院无锡石油地质研究所, 江苏无锡 214126
2.
浙江大学地球科学学院, 杭州 310027
3.
山东农业大学资源与环境学院, 山东泰安 271018

基金项目:

国家自然科学基金企业创新发展联合基金项目 U19B6003-01

国家油气重大专项 2017ZX05005001-004

山东省自然科学基金项目 ZR201807080108

详细信息

作者简介:
邓棚(1990-), 男, 博士, 助理研究员, 从事盆地构造分析研究。E-mail: dengpeng_003@163.com

中图分类号: TE121.1
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出版历程
- 收稿日期: 2020-03-16
- 修回日期: 2020-09-01
- 刊出日期: 2021-01-28

New insights into structural characteristics in central-northern Longmen Mountains: implications for multiple-decollement deformation

1.
Wuxi Research Institute of Petroleum Geology, SINOPEC, Wuxi, Jiangsu 214126, China
2.
School of Earth Sciences, Zhejiang University, Hangzhou, Zhejiang 310027, China
3.
College of Resources and Environment, Shandong Agriculture University, Tai'an, Shandong 271018, China

摘要

摘要: 龙门山中北段处于中段与北段过渡转换位置，前期的构造变形特征研究相对薄弱。基于重新处理的二维地震长线资料，综合运用野外基础地质观测、钻井结构分析和构造解析等手段方法，系统厘定了龙门山中北段构造变形特征。龙门山中北段厚皮带一侧变形层次深，以韧性变形为主，表现为一系列紧闭倒转向斜和背斜组合样式；过渡Ⅰ带发育多条逆冲断裂呈叠瓦状冲断至地表，主干断裂下盘三叠系软弱层中通常派生次级平缓断裂，控制着内部叠瓦状不对称断层传播褶皱的发育；过渡Ⅱ带整体为山前隐伏带，发育1号隐伏断裂及其上盘强烈变形的叠瓦状逆冲构造和下盘弱挤压褶皱变形的原地体等。高角度逆冲主干断裂下盘的相对软弱层中通常派生发育次级平缓断裂，两者构成倒“γ”型变形样式。综合变形特征和成因机制分析认为，叠瓦状和倒“γ”型复合冲断样式构成研究区基本冲断变形样式，其形成受控于龙门山地区由深到浅、自后缘向前缘的多层次滑脱变形。
- 构造特征 /
- 构造样式 /
- 多层滑脱变形 /
- 龙门山中北段
Abstract: The central-northern segment of the Longmen Mountains is located in the transfer zone, for which the structural characteristics are little studied. Based on the reprocessed two-dimensional seismic data, this work used methods such as field geological investigation, drilling analysis and structural interpretation to comprehensively study the structural characteristics in the central-northern segment of the Longmen Mountains. The thick belt is characterized by deep and ductile deformation and shows the combination styles of a series of tight anticlines and synclines. The transition belt I developed many imbricate faults which cut to the ground surface. The main faults in the transition belt I derived many secondary gently dipping faults in the footwall, which controlled the development of the relative fault-propagation folds. The transition belt Ⅱ is a buried structure that includes the No.1 fault. The intense imbricate thrust structures occurred in its hanging wall and the autochthonous structure with weak fold deformation developed in its footwall. This study provides new insight that the high-angle thrust faults commonly derive secondary gently dipping faults in the footwall, and both of them formed the falling-γ type of the structure style. According to the analysis of the structure characteristics and mechanism origin, it is suggested that the composite structure styles combining the imbricate and falling-γ type are the basic structure styles in the study area, which is controlled by the multiple-decollement deformation from the deep layer to the shallow layer as well as from the trailing edge to the leading edge.
- structural characteristics /
- structural style /
- multiple-decollement deformation /
- central-northern segment of Longmen Mountains

HTML全文

图 1 龙门山冲断带构造略图

据文献[22]修改。

Figure 1. Structural sketch map of Longmen Mountains thrust belt

下载: 全尺寸图片幻灯片

图 2 龙门山中北段研究区地质特征、地表实测剖面和二维测线剖面

图 2a位置见图 1a。

Figure 2. Geologic features, measured geological section and 2D seismic maps of central-northern segment in Longmen Mountains

下载: 全尺寸图片幻灯片

图 3 龙门山中北段测线剖面北川—映秀断裂地震反射特征

剖面位置见图 2c的黑色虚线框。

Figure 3. Reprocessed 2D seismic profile of Beichuan-Yingxiu Fault in central-northern segment of Longmen Mountains

下载: 全尺寸图片幻灯片

图 4 龙门山中北段擂鼓镇断裂及其下盘构造变形特征

Figure 4. Structural characteristics of Leiguzhen Fault and its footwall in central-northern segment of Longmen Mountains

下载: 全尺寸图片幻灯片

图 5 龙门山中北段黄连桥断裂及其下盘构造变形特征

Figure 5. Structural characteristics of Huanglianqiao Fault and its footwall in central-northern segment of Longmen Mountains

下载: 全尺寸图片幻灯片

图 6 龙门山中北段楠木园断裂下盘出露的水平滑脱断裂及内部韧性剪切变形

Figure 6. Decollement fault and ductile shear deformation developed in footwall of Nanmuyuan Fault, central-northern segment of Longmen Mountains

下载: 全尺寸图片幻灯片

图 7 龙门山中北段川29井和川36井地层结构示意

Figure 7. Architecture sketch map of wells Chuan 29 and Chuan 36, central-northern segment of Longmen Mountains

下载: 全尺寸图片幻灯片

图 8 龙门山中北段构造变形模式示意

据文献[22, 36]修改。

Figure 8. Tectonic deformation model in central-northern segment of Longmen Mountains

下载: 全尺寸图片幻灯片

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