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四川汶川地震断裂带科学钻探2号孔(WFSD-2)岩性特征和断裂带的结构 预览 被引量:19

Lithologic characteristics and fault zone structure revealed by No.2 hole cores of the Wenchuan Earthquake Fault Zone Scientific Drilling(WFSD-2)
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摘要 以WFSD-2钻孔岩心为研究对象,通过详细的岩心编录和岩石学、构造地质学等研究,识别出该钻孔岩心具有6段岩性,从上向下依次为彭灌杂岩(0-599.31m)、三叠系须家河组二段(599.31-1211.49m)、彭灌杂岩(1211.49-1679.51m)、三叠系须家河组三段(1679.51-1715.48m)、彭灌杂岩(1715.48-2081.47m)、三叠系须家河组四段(2081.47-2283.56m)。彭灌杂岩主要以花岗岩和火山岩为主,三叠系须家河组沉积岩以砂岩、粉砂岩、泥岩、页岩、煤层(线)和砾岩为主。3套彭灌杂岩与三叠系须家河组沉积岩重复出现,时代较老的岩性段逆冲覆盖在新的地层之上,表明龙门山构造带由一系列逆冲岩片叠置而成。岩心中断裂岩较为发育,主要为断层角砾岩、碎裂岩和断层泥,反映出脆性变形作用的特点。通过对断裂岩的统计分析,厘定了20余条产状不同、规模不等的次级断裂带,断裂带宽度和断裂密度峰值显示FZ600、FZ720、FZ782、FZ817、FZ922、FZ951、FZ1449、FZ1681、FZ2082为主要断裂带,其中FZ1681系规模最大的一条断裂。依据断裂岩的组合特征可以将岩心中断裂带的结构以断层泥为核部划分为两大类:对称型断裂带和不对称型断裂带。根据地表破裂带、WFSD-1钻孔岩心中主滑移带位置的几何关系、岩性分层等因素,可推断汶川地震主滑移带应位于FZ1134、FZ1449或FZ1681之中,同时也暗示该地区经常发生类似汶川地震的大地震活动。研究表明,龙门山地区经历了强烈的构造缩短和快速隆升作用,暗示龙门山地区构造活动非常强烈。 With the WFSD-2 drill hole as the object,the authors studied core logging,petrology and structural geology.The results show that the cores can be divided into six segments,which are in downward succession the Pengguan complex(0~599.31m),the second Member of the Xujiahe Formation(599.31~1211.49m),the Pengguan complex(1211.49~1679.51m),the third Member of the Xujiahe Formation(1679.51~1715.48m),the Pengguan complex(1715.48~2081.47m) and the fourth Member of the Xujiahe Formation(2081.47~2283.56m).The Pengguan complex mainly consists of granite and volcanic rocks,and the Xujiahe Formation comprises Triassic sedimentary rocks of sandstone,slitstone,mudstone,shale,coal beds(streaks) and conglomerate.Three sections of the Pengguan complex and three sections of the Xujiahe Formation occur in alternate repetition in the WFSD-2,indicating that the Longmenshan tectonic belt is composed of a series of thrust lithologic sheets.There are a lot of fault-related rocks in the WFSD-2 cores,such as fault breccia,cataclasites and fault gouge,reflecting the brittle deformation.Based on a statistical analysis of the fault-related rocks,the authors detected twenty fault zones in the WFSD-2,indicating that many earthquakes like 2008 Wenchuan Earthquake occurred in Longmenshan area.Of the nine primary fault zones of FZ600,FZ720,FZ782,FZ817,FZ922,FZ951,FZ1449,FZ1681,FZ2082 and FZ1681,the FZ1681 is the biggest primary fault zone in the whole WFSD-2.According to the association characteristics of fault-related rocks,the fault zones can be divided into symmetric and asymmetric fault zones,with fault gouge as the center.According to the dip angles of the trench and WSFD-1 primary slip zone(PSZ),the PSZ in the WFSD-2 should occur within one of the primary fault zones of FZ1134,FZ1681 and FZ1681,which all have fault gouge and reasonable geometrical interpretation among rupture zones in WFSD-1 and WFSD-2.An integrated analysis of four thrust rock segments,twenty fault zones and high breakage density shows that th
作者 张伟 李海兵 黄尧 司家亮 刘栋粱 李勇 王焕 杨光 孙立文 ZHANG Wei1,2,3,LI Hai-bing2,3,HUANG Yao4,SI Jia-liang2,3,LIU Dong-liang2,3, LI Yong1,WANG Huan2,3,YANG Guang1,2,3,SUN Li-wen4 1.Chengdu University of Technology,Chengdu 610059,Sichuan,China; 2.State Key Laboratory of Continental Tectonics and Dynamics,Beijing 100037,China; 3.Institute of Geology,Chinese Academy of Geological Sciences,Beijing 100037,China; 4.No.6 Geological Party,Jiangsu Bureau of Geology and Mineral Exploration,Lianyungang 222300,Jiangsu,China
出处 《地质通报》 CAS CSCD 北大核心 2012年第8期1201-1218,共18页 Geologcal Bulletin OF China
基金 国家科技支撑项目《汶川地震断裂带科学钻探》 中国地质调查局基础研究项目《青藏高原北缘和东缘大型断裂带与地震活动》(编号:1212011121267)、《龙门山构造带深部地质调查》(编号:1212011220264)致谢:江苏省地质矿产局第六地质大队魏金川、成都理工大学岳相元硕士对岩石薄片研究工作给予帮助.成都理工大学闫亮、颜照坤博士对钻孔岩心分层工作给予帮助,汶川科钻中心吴建国、吴孝斌和刘光杰司机师傅提供了良好的后勤保障工作,汶川科钻中心樊腊生提供的WFSD-2孔的部分工程数据,审稿专家对本文提出了重要的修改意见,在此一并表示衷心的感谢.
关键词 汶川地震断裂带科学钻探(WFSD) 断裂岩 断裂带结构 映秀-北川断裂带 龙门山 Wenchuan Earthquake Fault Zone Scientific Drilling(WFSD) fault-related rocks fault zone structure Yingxiu-Beichuan fault zone Longmen Mountain
作者简介 张伟(1985-),男,在读硕士,从事活动构造研究。E-mail:zhangweipingyi@163.com 通讯作者:李海兵(1966-),男,研究员,从事新构造、活动构造与构造地貌研究。E-maii:hhaibing06@yahoo.com.cn
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