川西理塘断裂带木里段断层泥石英微形貌特征及其地质意义  

Micromorphological Characteristics of Quartz in Fault Gouge in the Muli Section of the Litang Fault Zone and Their Geological Significance

作　　者：罗绍强[1] 肖进[1] 胡林[1] LUO Shao-qiang;XIAO Jin;HU Lin(Northwest Sichuan Geological Party,BGEEMRSP,Mianyang,Sichuan 621000)

机构地区：[1]四川省地质矿产勘查开发局川西北地质队,四川绵阳621000

出　　处：《四川地质学报》2022年第1期12-16,共5页Acta Geologica Sichuan

基　　金：中国地质调查局区域地质矿产调查项目:四川1∶5万东朗乡等6幅区域地质矿产调查(1212011220384)。

摘　　要：断层中的断层泥是断层活动的信息载体。在木里地区,理塘断裂带表现出多期次活动特征,早期以韧性剪切为主,晚期表现出高角度张性左行走滑特征。通过对理塘断裂带断层泥石英表面微形貌特征观察、统计及分析,结果表明:石英表面形貌结构以次贝壳状和桔皮状为主,表明断裂的最新活动期在早-晚更新世(Qp1-Qp3),与电子磁旋共振(ESR)测年结果(0.7±0.1Ma)基本吻合。断层存在多期次运动,运动方式以粘滑为主,兼有蠕滑,且粘滑运动表现更晚。The Muli section of the Litang fault zone is characterized by ductile shear in the early stage and high angle tensional left strike-slip in the late stage.Micromorphological characteristics in sub-shell-shaped and orange peel-shaped form of quartz in fault gouge indicate that the last fault activity occurred in the Early-Late Pleistocene Epoch(Qp^(1)-Qp^(3)),being consistent with the dating results of electron magnetic resonance(ESR)of 0.7±0.1Ma.The fault is characterized by multiphase activity with stick slipping in the early stage and creep slipping in the late stage.

关 键 词：石英微形貌 地质意义 理塘断裂带 木里 

分 类 号：P546[天文地球—构造地质学] P542[天文地球—地质学]