弱震区断层泥ESR定年的适应性研究—

弱震区断层泥ESR定年的适应性研究——以杭州地区为例

英文篇名：A study on adaptability of direct ESR dating of fault gouge in a region with weak seismicity:A case study on Hangzhou region, China
中文刊名：地震学报
英文刊名：Acta Seismologica Sinica
作者：姚琪 ; 陈汉林 ; 张微 ; 叶建青 ; 刘静伟 ; 赵冬 ; 牛佳文 ; 廖林
英文作者：Yao Qi1 ; 2) ; Chen Hanlin1 ; 2) Zhang Wei1 ; 2) Ye Jianqing3)Liu Jingwei4) Zhao Dong3) Niu Jiawen1 ; 2) Liao Lin1 ; 2) 1) Department Earth of Sciences ; Zhejiang University ; Hangzhou 310027 ; China 2) Basin Structural Research Centre ; Chinese Education Ministry ; Hangzhou 310027 ; China 3) The Engineering Seismology Institute of Zhejiang Province ; Hangzhou 310013 ; China 4) State Key Laboratory of Earthquake Dynamics ; Institute of Geology ; China Earthquake Administration ; Beijing 100029 ; China
中文关键词：断层泥 ; ESR测年 ; 断层活动性 ; 萧山—球川断裂 ; 杭州
英文关键词：fault gouge ; ESR dating ; fault activity ; Xiaoshan--Qiuchuan fault ; Hangzhou region
出版日期：2008-05-15
机构：浙江大学地球科学系,浙江大学地球科学系,浙江大学地球科学系,浙江省工程地震研究所,中国地震局地震动力学国家重点实验室,浙江省工程地震研究所,浙江大学地球科学系,浙江大学地球科学系中国杭州310027教育部含油气盆地构造中心,中国杭州310027,中国杭州310027教育部含油气盆地构造中心,中国杭州310027,中国杭州310027教育部含油气盆地构造中心,中国杭州310027,中国杭州310027教育部含油气盆地构造中心,中国杭州310027,中国杭州310027教育部含油气盆地构造中心,中国杭州310027
年：2008
期：03
出版单位：地震学报

摘要

在杭州地区,根据系统采集的萧山—球川断裂、孝丰—三门湾断裂和昌化—普陀断裂的断层泥ESR年龄,以及地层的光释光年龄的统计分析表明,对同一断层同一段而言,断层泥ESR年龄大于地层光释光所给出的断层最后一次活动时代,并不能反映杭州地区各个断裂最后一次活动时代,而是反映了断裂历次较强活动的历史.在距今100—58万年,各断裂均有活动;58—45万年断裂活动性减弱;45—20万年仅萧山—球川断裂活动;10万年以来杭州地区整体处于弱地震背景.以孝丰—三门湾断裂为界,萧山—球川断裂第四纪的活动具有鲜明的分段性.
This paper collected fault gouge samples systematically for ESR (electron spin resonance) dating, and sediment samples for OSL (optically stimulated luminescence) dating, along Xiaoshan--Qiuchuan fault, Xiaofeng--Sanmen fault and Changhua--Putuo fault. In the same fault outcrop, the ESR dated age of fault gouge is older than the time of last fault movement concluded from the OSL data of overlying strata and offset strata. Therefore, the ESR data of fault gouge colleted in Hangzhou region do not represent the time of weak fault movement in late Cenozoic, but represent the episodes of past strong fault movements. The episode of fault movement in late Cenozoic could be inferred according to the ESR data: during 1.00—0.58 Ma, there were strong fault movements along the Xiaofeng--Sanmen fault, Xiaoshan--Qiuchuan fault and Changhua--Putuo fault in Hangzhou region; 0.58—0.45 Ma, the movement of all faults became weaker and did not reset ESR signals; 0.45—0.20 Ma, there were strong fault movements along part of Xiaoshan--Qiuchuan fault; 0.1—0.01 Ma, there were fault movements along the Xiaofeng--Sanmen fault only, but the fault movements were not strong enough to reset the ESR signal; since 0.01 Ma, the Hangzhou region tends to be stable. In addition, the Xiaofeng--Sanmen fault might demarcate the Xiaoshan--Qiuchuan fault into segments.

引文

①浙江省工程地震研究所.2004.萧山—球川断裂(富阳—盐官段)活动性研究.
    ②浙江省工程地震研究所.2001.杭州市钱塘江四桥工程场地地震安全性评价研究报告.
    陈文寄,彭贵.1991.年轻地质体系的年代测定[M].北京:地震出版社:132--173.
    丁伯阳,叶建青,孟凡丽,陶海冰.2003.杭州市周边构造和断层及其对建、构筑物的影响[J].浙江工业大学学报,31(3):319--323.
    火恩杰,刘昌森,章振铨.2004.上海市隐伏断裂及其活动性研究[M].北京:地震出版社:23--32.
    李力刚,黄培华,傅容珊,黄建华,徐耀民.1999.断层粘滑摩擦增温的理论分析及其对TL、ESR测龄的意义[J].地震地质,20(4):387--396.
    李志宏.2004.浙江地区新生代地貌的基本特征及演化[D].广州:中山大学地球科学系:38--39.
    林敏,贾丽,丁艳秋,崔莹,陈克胜,李华芝,肖振红,尹功明.2005.ESR测年研究中人工辐照吸收剂量的确定[J].地震地质,27(4):698--705.
    孙瑛杰,卢演俦,尹功明.1999.沂沭断裂带大水场剖面断层泥的ESR年代学研究[J].地震地质,21(4):346--350.
    王志才,晁洪太,崔昭文,李家灵,石荣会.2002.青岛及邻区NE向断裂的第四纪活动性及控震意义[J].地震地质,24(2):167--176.
    杨坤光,梁兴中,谢建磊,杨奎锋.2006.ESR定年:一种确定脆性断层活动年龄的方法原理与应用[J].地球科学进展,21(4):430--435.
    叶建青.2001.城市活断层研究与浙江省的城市化建设[J].上海地质,(4):31--33.
    俞维贤,谢英情,张建国,杨继武.2004.昆明盆地周边地区主要断裂活动时代研究[J].地震研究,27(4):357--362.
    钟羽云,姚立.2000.浙北及邻近地区应力场数值模拟与地震危险区预测[J].地震学刊,20(3):9--17.
    Fukuchi T.1993.Vacancy-associatedtype ESRcenters observedin natural silica andtheir applicationto geology[J].Ap-pl Radiat Isotopes,44:179--184.
    Fukuchi T.2001.Assessment of fault activity by ESR dating of fault gouge:An example of the500m core samplesdrilledinto the Noji ma earthquake fault in Japan[J].Quaternary Science Reviews,20:1005--1008.
    Ikeya M,Miki T,Tanaka K.1982.Dating of a fault by electron spin resonance onintrafault materials dating of a fault byelectron spin resonance onintrafault materials[J].Science New Series,215(4538):1392--1393.
    Skinner A R.2000.ESR dating:Is it still an‘experi mental’technique?[J].Appl Radiat Isotopes,52:1311--1316.