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北秦岭二郎坪群晚中生代伸展-走滑-收缩体制研究

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张宏远, 王宗起, 刘俊来, 闫全人, 王涛, 闫瑧. 北秦岭二郎坪群晚中生代伸展-走滑-收缩体制研究[J]. 地质力学学报, 2009, 15(1): 56-68.
引用本文: 张宏远, 王宗起, 刘俊来, 闫全人, 王涛, 闫瑧. 北秦岭二郎坪群晚中生代伸展-走滑-收缩体制研究[J]. 地质力学学报, 2009, 15(1): 56-68.
shu
ZHANG Hong-yuan, WANG Zong-qi, LIU Jun-lai, YAN Quan-ren, WANG Tao, YAN Zhen. THE LATE MESOZOIC EXTENSION-SLIPPING-CONTRACTION OF THE ERLANGPING GROUP IN THE NORTH QINLING TECTONIC BELT, CENTRAL CHINA[J]. Journal of Geomechanics, 2009, 15(1): 56-68.
Citation: ZHANG Hong-yuan, WANG Zong-qi, LIU Jun-lai, YAN Quan-ren, WANG Tao, YAN Zhen. THE LATE MESOZOIC EXTENSION-SLIPPING-CONTRACTION OF THE ERLANGPING GROUP IN THE NORTH QINLING TECTONIC BELT, CENTRAL CHINA[J]. Journal of Geomechanics, 2009, 15(1): 56-68.
shu

北秦岭二郎坪群晚中生代伸展-走滑-收缩体制研究

  • 1.

    中国地质大学 (北京) 地质过程与矿产资源国家重点实验室, 北京 100083

  • 2.

    中国地质科学院矿产资源研究所, 北京 100037

  • 3.

    中国地质科学院地质研究所, 北京 100037

  • 基金项目:
    地质过程与矿产资源国家重点实验室基金项目(GPMR200634);国家自然科学基金项目(40602026);国家自然科学重点基金项目(90814006)
详细信息
    作者简介: 张宏远(1977-), 男, 河北省新城县(今高碑店市)人, 博士, 现任中国地质大学(北京)讲师, 主要从事构造地质学领域的教学科研工作。E-mail:zhanghongyuan@cugb.edu.cn

  • 中图分类号: P54

THE LATE MESOZOIC EXTENSION-SLIPPING-CONTRACTION OF THE ERLANGPING GROUP IN THE NORTH QINLING TECTONIC BELT, CENTRAL CHINA

  • 1.

    State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing 100083, China

  • 2.

    Institute of Mining Resources, Chinese Academy of Geological Sciences, Beijing 100037, China

  • 3.

    Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China

    摘要

  • 晚中生代, 中朝、扬子两地块的拼合带进一步受到强烈的陆内构造-岩浆活动改造, 为揭示其规律性, 以拼合带上北秦岭二郎坪群主体地块为研究对象, 综合开展了中小构造解析、显微构造岩组学、电子探针、年代学等研究。研究发现, 二郎坪群主体内部的小寨-二郎坪剪切带具右行韧性走滑特征, 大庙-湾潭剪切带具右行韧性走滑兼后期脆-韧性逆掩叠加的特征; 40Ar/39Ar构造-热年代学分析揭示出一期连续抬升-剥露过程, 时间介于~ 121 Ma和~ 100 Ma之间。晚中生代二郎坪群地块经历了伸展-走滑-收缩背景依次控制下的构造改造过程, 先是在区域伸展体制下, 被内部的小寨-二郎坪剪切带、大庙-湾潭剪切带切割为抱树坪岩片、火神庙岩片、二进沟岩片等构造岩片; 在其后的早白垩世早期区域走滑背景下, 各构造岩片又发生了平移为主的右行走滑运动; 最后, 二郎坪岩体的侵入终止了内部小寨-二郎坪剪切带的活动, 而大庙-湾潭剪切带也在区域收缩体制下终止活动, 从而使二郎坪群重又焊接为一体。研究结果预示着北秦岭二郎坪群晚中生代同时期的构造体制可能与大别山是相反的。

    The convergence belt between the Sino-Korea block and the Yangtze block was strongly deformed by intracontinental tectonomagmatic activity in the Late Mesozoic.In order to show details of the belt during the Late Mesozoic, we have carried out a series of analysis for the Erlangping Group on mesosmall structure, micro-texture, electron-probe and geochronology.The study has recognized a ductile right lateral slipping deformation for the Xiaozhai-Erlangping shear zone inside the Erlangping Group, and a superimposion of ductile right lateral slipping and late brittle-ductile thrusting for the Damiao-Wantan shear zone.40Ar/39Ar tectonic-thermal chronological analysis reveals a continuous uplifting-denudating course between ~ 121 Ma and ~ 100 Ma.During the Late Mesozoic, the Erlangping Group experienced the tectonic reworkings respectively under the extensional, slipping and contractional tectonic regimes. Firstly, under the regionally extensional condition, the Erlangping Group was split by the XiaozhaiErlangping and Damiao-Wantan shear zones into three slabs, namely the Baoshuping, Huoshenmiao, and Erjingou slabs.Then in Early Cretaceous a right lateral movement of the slabs happened under a slipping regime.The intrusion of the Erlangping rock body ended the Xiaozhai-Erlangping shear zone, and the Damiao-Wantan shear zone was stopped under a contractional tectonic regime, which made the Erlangping Group welded into a single block again.Our results also indicated that the tectonic evolution of the Erlangping Group of the North Qinling in the Late Mesozoic processed in an opposite way to that of the Dabieshan tectonic belt.

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  • 图 1  北秦岭二郎坪群构造简图及观测点位(据文献[12, 21-24]编制)

    Figure 1. 

    下载: 全尺寸图片 幻灯片

    图 2  中坪南二云母片岩显微构造

    Figure 2. 

    下载: 全尺寸图片 幻灯片

    图 3  小寨-二郎坪韧性剪切带内糜棱岩三维显微构造模型

    Figure 3. 

    下载: 全尺寸图片 幻灯片

    图 4  大庙-湾潭剪切带的显微右行剪切运动学标志

    Figure 4. 

    下载: 全尺寸图片 幻灯片

    图 5  朱阳关-夏馆韧性剪切带小水-马蹄湾一带的糜棱岩显微岩组学分析

    Figure 5. 

    下载: 全尺寸图片 幻灯片

    图 6  朱阳关-夏馆剪切带子母沟糜棱岩显微构造分析

    Figure 6. 

    下载: 全尺寸图片 幻灯片

    图 7  瓦穴子-乔端剪切带(F2)糜棱岩显微构造分析

    Figure 7. 

    下载: 全尺寸图片 幻灯片

    图 8  Q0420-1黑云母40Ar/39Ar坪年龄谱(左)和等时年龄(右)

    Figure 8. 

    下载: 全尺寸图片 幻灯片

    表 1  样品Q0420-1黑云母40Ar/39Ar阶段升温测年数据

    Table 1.  40Ar/39Ar aging data of biotite from Sample Q0420-1

    下载: 导出CSV
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收稿日期:  2008-11-20
刊出日期:  2009-03-25

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