台湾车笼埔断层带上的黏土矿物变化和摩擦温度
- 出版年：2010
- 作者：Sheng-Rong Song (宋圣荣)；Li-Wei Kuo
- 单位1：Department of Geoscience
- 语种：中文
- 起始页：34
- 总页数：2
- 刊名：国际地震动态
- 是否内版：否
- 刊频：月刊
- 创刊时间：1971
- 主管单位：中国科学技术协会
- 主办单位：中国地震学会；中国地震局地球物理研究所
- 主编：许绍燮
- 地址：北京市海淀区民族大学南路5号
- 邮编：100081
- 电子信箱：rdws@cea-igp.ac.cn
- 网址：http://www.gjdzdt.org.cn
- 期：6
- 期刊索取号：P263.06 627-3
- 数据库收录：中国核心期刊（遴选）数据库收录期刊；中国学术期刊综合评价数据库统计源期刊；中国期刊全文数据库（CJFD）全文收录期刊；中文科技期刊数据库原文收录期刊
- 核心期刊：中国核心期刊（遴选）数据库收录期刊
摘要
The Chi-Chi earthquake occurred in September 21, 1999, causing disastrousdamages over wide areas in north-western part of Taiwan. Surface ruptures and seismic re-cords showed particular and different motions in northern and southern part of Chelungpufault. The origin of such unique behavior of Chelungpu fault promotes the Taiwan Chelung-pu-fault Drilling Project (TCDP) started under the Taiwanese initiatives. TCDP thus pro-vides a unique opportunity to observe and analyze the materials within the fault zone deeperthan 1 km soon after a major earthquake. Characteristics of clay minerals within fault zonefrom TCDP may provide us helpful indicators to understand physical and chemical propertiesas well as the mechanism of earthquakes.
This study collected the samples from the depth 600 m to 1 300 m, especially focusing onthe gouges in fault zones of the TCDP Hole-A. Two major fault zones (might be the Che-lungpu fault zone) can be identified in depths 1 111 m and 115 3 m respectively, and here wereport the discrepancy in clay minerals between those two major fault zones. The analyses ofXRD show the dramatically characteristic variations in clay minerals: ① the smectite is rareor none in the most part of the 1111 fault zone but rich in the depth of 1111. 29 m black mate-rial (more than 85%)；② the other clay minerals (illite, chlorite and kaolinite) are rich butdecrease to zero in black zone of the 1111 fault zone；③ the 1153 fault zone didn’t show aforementioned characteristics；④ kaolinite is absent only in narrow depth of the 1111 faultzone, but absent in broad ones of the 1153 fault zone. Characteristics of clay mineralogy inthe 1111 fault zone may be resulted from the devitrification of pseudotachylyte, occurred bythe rapid slip of the seismic earthquake. It was consistent with the glass having been identi-fied by TEM in the black layer of the 1111 fault zone, but not detected in the 1153 faultzone. The existence of pseudotachylyte indicate that the slip surface of seismic faulting eventoccurred in 1999 may be located in the depth 1 111. 29 m and the friction temperature mayreach up to the 950℃.
This study collected the samples from the depth 600 m to 1 300 m, especially focusing onthe gouges in fault zones of the TCDP Hole-A. Two major fault zones (might be the Che-lungpu fault zone) can be identified in depths 1 111 m and 115 3 m respectively, and here wereport the discrepancy in clay minerals between those two major fault zones. The analyses ofXRD show the dramatically characteristic variations in clay minerals: ① the smectite is rareor none in the most part of the 1111 fault zone but rich in the depth of 1111. 29 m black mate-rial (more than 85%)；② the other clay minerals (illite, chlorite and kaolinite) are rich butdecrease to zero in black zone of the 1111 fault zone；③ the 1153 fault zone didn’t show aforementioned characteristics；④ kaolinite is absent only in narrow depth of the 1111 faultzone, but absent in broad ones of the 1153 fault zone. Characteristics of clay mineralogy inthe 1111 fault zone may be resulted from the devitrification of pseudotachylyte, occurred bythe rapid slip of the seismic earthquake. It was consistent with the glass having been identi-fied by TEM in the black layer of the 1111 fault zone, but not detected in the 1153 faultzone. The existence of pseudotachylyte indicate that the slip surface of seismic faulting eventoccurred in 1999 may be located in the depth 1 111. 29 m and the friction temperature mayreach up to the 950℃.