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时间:2020-03-23
《同震和无震剪切滑移作用的纳微米级构造观察与分析.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、矿物岩石地球化学通报·纳米地质学·BulletinofMineralogy,PetrologyandGeochemistryVo1.35No.1,Jan.,2016同震和无震剪切滑移作用的纳微米级构造观察与分析晁洪太,孙岩2,王志才,崔昭文,薛革,王雷1.山东省地震局,济南250014;2.南京大学地球科学与工程学院,内生金属矿床成矿机制国家重点实验室,南京210093;3.防灾科技学院,河北燕郊065201摘要:本文基于中国东部郯庐活动断裂带同震和无震剪切滑移作用纳微米构造的观察分析,初步探讨
2、脆性粘滑发震断裂和韧性蠕滑孕震断裂的微观运动学机理。通过野外、标本和电镜观察,在断层主滑移带可见发育有3组表现不同的擦面擦线,反映滑移过程中跳动、“颤抖”和不稳定快速运动的特征,是一种发震断裂在脆性体制下的同震粘滑行为。而主滑移带旁侧的叶理带内,叶理片受扭动成拖曳褶皱,并裹夹透镜状石英颗粒,表现为蠕散、稳定和慢速运动特征,是一种在韧性体制下的无震蠕滑滑移行为。同震和无震剪切滑移作用在微观和超微观运动机理方面存在区别,代表着地震孕育和发震的不同阶段。关键词:发震断裂;断层主滑移带;同震粘滑;无震蠕
3、滑;纳微米构造中图分类号:P542.3文章编号:1007—2802(2016)Ol一0037—06doi:10.3969/j.issn.1007—2802.2016.01.004ObservationsandAnalysesofNano/Micro—StructuresofCoseismicStickSlippingandAseismicCreepSlippingFaultsCHAOHong—tai。SUNYan,WANGZhi—cai。CUIZhao—wen,XUEGe,WANGLei’,,1
4、.EarthquakeAdministrationofShandongProvince,Jinan250014,China;2.StateKeyLaboratoryforMineralDepositsResearch,SchoolofEarthSciencesandEngineering,Nn崞ngUniversity,Nang210093,China;3.InstituteofDisasterPrevention,Yanjiao,Hebei065201,ChinaAbstract:Ontheb
5、asisofanalysesofnano/micro—structuresoffaultgougessampledfromtheTanlufaultzoneineasternChina,micro—dynamicmechanismsofbothcoseismicstickslippingbrittlefaultsandaseismiccreepslippingductilefaultshavebeententativelydiscussedinthispaper.Accordingtoobser
6、vationsonsite,onspecimenandonpolishedblocksunderscanningelectronmicroscope(SEM),threesetsofslickensidelinesdevelopedontheprincipalslippingzone(PSZ)havebeenobserved.Theydisplayfeaturesofsuddenjump,jerkingandunstablefastsliding,andarebelievedtohavebeen
7、causedbystickslipbehaviorsofcoseismicbrittlefaults.However,flakyclaymineralsinthefoliationbeltoutsideofthePSZareusuallyfoldedandintercalatedwithlenticularquartzgrains.Thesefeaturesofcreep,stableandslowslippingarebelievedtohavebeencausedbyaseismicduct
8、ilefaults.Thedifferencesofbehaviorsbetweencoseismicandaseismicslip—pingfaultsintermsofmicro-·dynamicmechanismsarebelievedtohavebeencausedbytheearthquakegeneratingandhap-pingtwostagesrespectively.Keywords:earthquakefault;principalslidingzone;coseismic
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