| 磁化率各向异性与剪切带 |
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| 引用本文： | 华天,李金玺,李智武,冉波,童馗,王自剑,袁梦雨,蔡鸿燕,陈涛,李轲,刘升武.磁化率各向异性与剪切带[J].大地构造与成矿学,2021,45(2):280-295. |
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| 作者姓名： | 华天 李金玺 李智武 冉波 童馗 王自剑 袁梦雨 蔡鸿燕 陈涛 李轲 刘升武 |
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| 作者单位： | 成都理工大学 油气藏地质及开发工程国家重点实验室, 四川 成都 610059;成都理工大学 地球物理 学院, 地球勘探与信息技术教育部重点实验室, 四川 成都 610059;四川省煤田地质工程勘察设计研究院, 四川 成都 610072 |
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| 摘 要： | 岩石组构记录了地壳形成与演化的关键信息,提取这些信息对分析和恢复地球动力学过程具有重要意义。磁化率各向异性(AMS)是一种重要的岩石组构方法,可以有效地揭示岩石的应变特征,分析其地球动力学过程,是研究构造变形性质以及应力作用方式的有效手段。本文在梳理AMS的研究历史、主要成果和最新进展的基础上,系统阐述了AMS的基本原理以及在剪切带的应用:①岩石组构具有复杂性,AMS作为一种间接组构手段受控于矿物的物理特性、含量以及变形变质等多方面因素;②AMS可以提供剪切带的运动学以及不同部位应变状态的信息;③对于剪切带,AMS主要受控于磁性矿物(矿物成分和粒度的变化导致全岩磁化率各向异性的变化)、构造变形强度(决定磁线理发展的重要因素)以及流体的作用(流体导致磁性矿物的类型与定向性的变化)。
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| 关 键 词： | 磁化率各向异性 AMS 剪切带 岩石组构 |
Anisotropy of Magnetic Susceptibility and Shear Zone |
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| HUA Tian,LI Jinxi,LI Zhiwu,RAN Bo,TONG Kui,WANG Zijian,YUAN Mengyu,CAI Hongyan,CHEN Tao,LI Ke,LIU Shengwu.Anisotropy of Magnetic Susceptibility and Shear Zone[J].Geotectonica et Metallogenia,2021,45(2):280-295. |
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| Authors: | HUA Tian LI Jinxi LI Zhiwu RAN Bo TONG Kui WANG Zijian YUAN Mengyu CAI Hongyan CHEN Tao LI Ke LIU Shengwu |
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| Institution: | (State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Chengdu University of Technology,Chengdu 610059,Sichuan,China;MOE Key Laboratory of Earth Exploration and Information Technology,College of Geophysics,Chengdu University of Technology,Chengdu 610059,Sichuan,China;Sichaun Institude of Coal Field Geological Engineering Explortation and Designing,Chengdu 610072,Sichuan,China) |
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| Abstract: | Rock records and preserves critical information about the transformation and evolution of the crust.Extracting such information is of great significance for analyzing and restoring geodynamic processes.Anisotropy of magnetic susceptibility(AMS)is an important rock fabric,which effectively records the rock strain characteristics.It can be used to analyze the geodynamic process and is an effective method to study structural deformation and stress effects.In this paper,the basic principle of AMS and its application in shear zone are systematically described on the basis of the research history,main achievements and the latest progress of AMS.We can come to conclusions as below:(1)The rock fabric is complex,and the magnetic fabric,as an indirect means of fabric,is controlled by the physical properties of minerals,the types and contents of magnetic minerals,deformation and metamorphism.(2)The determination of magnetic minerals is the key to the study of magnetic fabric.(3)In most cases,there is a coaxial relationship between the principal axis of the magnetic ellipsoid and the strain ellipsoid,thus the magnetic ellipsoid can be used as“display”of rock deformation.(4)In the shear zone,AMS can obtain some structural information which is difficult to obtain by conventional geological methods.However,due to the complexity of shear zone and magnetic fabric,this method should be used with caution.It is necessary to make a reasonable explanation for its origin using geologic evidence from different aspects.(5)Strain across shear zone is typically heterogeneous,which leads to the different orientation of the magnetic fabric.Moreover,deformation is commonly accompanied by fluid-rock interaction or mineral segregation.The interaction between fluid and rock induces changes in magnetic mineralogy.(6)In shear zone,the relationship between Pj and strain depends strongly on the deformation mechanisms and the mineral carriers of AMS as well. |
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| Keywords: | anisotropy of magnetic susceptibility AMS shear zone rock fabric |
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