恭城—栗木断裂带活动特征及其与地质灾害的关系
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摘要
作为广西24条深大断裂之一,恭城-栗木断裂带的现有研究状况与其重要地位极不相称。以断层岩为主要研究内容,从变形结构、变形环境与古应力场等方面入手探讨了断裂带的活动特征,并分析了其与地震和岩溶塌陷等地质灾害成生之间的联系。研究认为:⑴断裂带属脆性-脆韧性变形域,具有多期次的活动历史,新近构造应力场的主压应力轴有自东西方向向西北方向逆时针旋转的作用轨迹;⑵断裂带的变形结构及活动特征与区域地震的发震及其迁移规律相协调。遵循区域地震发震的折返规律,该断裂可能再次活动并成为控震断裂;⑶断裂带对沿线岩溶作用过程和岩溶塌陷的发育具有时空控制作用,其伴生的岩溶塌陷不仅具有高发概率和高危害性,而且具有可循的规律性。
Gongcheng-Limu fault zone is one of the 24 deep fracture zones in Guangxi.But,it is incommensurate between the low study levels and its important status now.This paper discussed the activity characteristic of the fault zone and analyzed its relationship with seismogenic rule and karst collapses based on the fault rock investigation which can explore the deformation structure and deformation background and paleo-tectonic stress fields of the fault zone.The research indicates that ⑴ The fault zone is a brittle to brittle-ductile deformation domain and has a multi-episodic activity history.The operation track of the principal compressive stress axis that acts on the fault zone in newly geological history has counterclockwise rotation from EW to NW.⑵ The deformation structure of the fault zone and its activity characteristic is in accordance with the seismogenic formation and its transfer rule.It is possible that the fault zone will be active again and will become an earthguake-controlling one ⑶ The fault zone controls karst processes and karst collapse spatiotemporally.The associated karst collapse not only has high occurrence frequency but also has its regularity
Gongcheng-Limu fault zone is one of the 24 deep fracture zones in Guangxi.But,it is incommensurate between the low study levels and its important status now.This paper discussed the activity characteristic of the fault zone and analyzed its relationship with seismogenic rule and karst collapses based on the fault rock investigation which can explore the deformation structure and deformation background and paleo-tectonic stress fields of the fault zone.The research indicates that ⑴ The fault zone is a brittle to brittle-ductile deformation domain and has a multi-episodic activity history.The operation track of the principal compressive stress axis that acts on the fault zone in newly geological history has counterclockwise rotation from EW to NW.⑵ The deformation structure of the fault zone and its activity characteristic is in accordance with the seismogenic formation and its transfer rule.It is possible that the fault zone will be active again and will become an earthguake-controlling one ⑶ The fault zone controls karst processes and karst collapse spatiotemporally.The associated karst collapse not only has high occurrence frequency but also has its regularity
引文
[1]广西壮族自治区地质矿产局.广西壮族自治区区域地质志[M].北京:地质出版社,1985:1-853.
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[4]隋志龙,黄春霞,李德威.恭城-栗木断裂带中的断溶角砾岩[J].地质科技情报,2003,22(1):24-28.
[5]吴树仁,刘子忠,秦兴黎,等.长江三峡仙女山断层带的变形结构及其动力学分析[J].地震地质,1994,16(3):217-228.
[6]章荣岫.节理等角度统计法[J],桂林冶金地质学院学报,1989,9(2):219-222.
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[8]单文琅,宋鸿林,傅昭仁.构造变形分析的理论、方法和实践[M].武汉:中国地质大学出版社,1991,1-153.
[9]吴树仁,孙叶.宁波地区镇海断裂带燕山晚期构造应力场研究[J].地球科学,1990,15(6):607-615.
[10]冉勇康,李建彪,闵伟,等.南水北调西线工程区及邻域的活动构造[J].岩石力学与工程学报,2005,24(20):3664-3672.
[11]游象照.广西活动性断裂的特征及其与地震关系[J].华南地震,1982,2(3):7-14.
[12]邓业权.广西地震的空间分布[J].地震研究,1985,8(1):11-20.
[13]吴时平,龙安明,尹克坚.广西地震活动性研究[J].华南地震,1987,7(1):48-62.
[14]邓业权.广西地震活跃区域的迁移[J].华南地震,1993,3(4):80-82.
[15]劳王枢.广西中强地震迁移的探讨[J].地震地磁观测与研究,1992,1:46-49.
[16]龙安明.广西特殊地震研究[J].华南地震,1992,12(4):22-31.
[17]邓自强,林玉石,张美良,等.桂林岩溶与地质构造[M].重庆:重庆出版社,1988.20-36.
[18]冯佐海,李晓峰,刘辉利.桂林市断裂构造对岩溶塌陷的控制作用[J].桂林工学院学报.2000,20(4):344-349.
[19]冯佐海,梁金城,李晓峰,等.桂林市岩溶塌陷成因类型与时空分布特征[J].自然灾害学报,2001,10(3):92-97.
[2]孔凡臣,丁国瑜.线性构造分维值的含义[J].地震,1991,5:33-37.
[3]隋志龙,梁金城.广西恭城-栗木断裂带的分形分析[J].广西科学,2001,8(2):111-113.
[4]隋志龙,黄春霞,李德威.恭城-栗木断裂带中的断溶角砾岩[J].地质科技情报,2003,22(1):24-28.
[5]吴树仁,刘子忠,秦兴黎,等.长江三峡仙女山断层带的变形结构及其动力学分析[J].地震地质,1994,16(3):217-228.
[6]章荣岫.节理等角度统计法[J],桂林冶金地质学院学报,1989,9(2):219-222.
[7]汤经武,杨学敏.微型计算机在地质构造解析中的应用[M].武汉:中国地质大学出版社,1989,122-132.
[8]单文琅,宋鸿林,傅昭仁.构造变形分析的理论、方法和实践[M].武汉:中国地质大学出版社,1991,1-153.
[9]吴树仁,孙叶.宁波地区镇海断裂带燕山晚期构造应力场研究[J].地球科学,1990,15(6):607-615.
[10]冉勇康,李建彪,闵伟,等.南水北调西线工程区及邻域的活动构造[J].岩石力学与工程学报,2005,24(20):3664-3672.
[11]游象照.广西活动性断裂的特征及其与地震关系[J].华南地震,1982,2(3):7-14.
[12]邓业权.广西地震的空间分布[J].地震研究,1985,8(1):11-20.
[13]吴时平,龙安明,尹克坚.广西地震活动性研究[J].华南地震,1987,7(1):48-62.
[14]邓业权.广西地震活跃区域的迁移[J].华南地震,1993,3(4):80-82.
[15]劳王枢.广西中强地震迁移的探讨[J].地震地磁观测与研究,1992,1:46-49.
[16]龙安明.广西特殊地震研究[J].华南地震,1992,12(4):22-31.
[17]邓自强,林玉石,张美良,等.桂林岩溶与地质构造[M].重庆:重庆出版社,1988.20-36.
[18]冯佐海,李晓峰,刘辉利.桂林市断裂构造对岩溶塌陷的控制作用[J].桂林工学院学报.2000,20(4):344-349.
[19]冯佐海,梁金城,李晓峰,等.桂林市岩溶塌陷成因类型与时空分布特征[J].自然灾害学报,2001,10(3):92-97.
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