索伦缝合带中的印支期伸展作用:中国内蒙古苏尼特左旗变质核杂岩(英文)

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	索伦缝合带中的印支期伸展作用:中国内蒙古苏尼特左旗变质核杂岩(英文); Indosinian extension in the Solonker suture zone: The Sonid Zuoqi metamorphic core complex, Inner Mongolia, China
	XU Bei ; ZHENG Ya-dong ; ZHANG Wei-jie
刊名	地学前缘
	2004
关键词	索伦缝合带苏尼特左旗变质核杂岩印支期 Solonker suture Sonid Zuoqi metamorphic core complex Indosinian
英文摘要	根据对内蒙古苏尼特左旗地区的野外研究 ,我们将以前描述的交其尔逆冲断层重新解释为一南倾的伸展拆离断层。该断层为一印支期变质核杂的主拆离断层 ,它叠加在缩短的阿尔泰和满洲里带间的晚古生代索伦缝合带上。变质核杂岩的组成要素包括 :下盘的古生代中期和二叠—三叠纪侵入体 (分别是宝底道和哈拉图岩体 ) ,交其尔拆离断层之下、叠加在下盘岩体上的糜棱岩状剪切带 ,拆离断层本身和上盘成分多变、构造复杂的古生代和元古宙岩石。从U Pb年龄为 2 5 2Ma的糜棱岩化哈拉图岩体中获得白云母 ,其40 Ar/ 3 9Ar冷却年龄为 2 2 4Ma和 2 0 8Ma ,而后伸展沉积的下、中侏罗统沉积在下盘之上 ,表...; Field studies in the Sonid Zuoqi area of Inner Mongolia have led to a reinterpretation of the previously described Jiaoqier thrust fault as a south-dipping extensional detachment fault.The fault is the master detachment structure of an Indosinian metamorphic core complex that is superposed on the late Paleozoic contractional Solonker suture zone between the Altaids and the Manchurides.Elements of the core complex include Middle Paleozoic and Permian-Triassic plutonic suites in its footwall (Baodidao and Halatu,respectively),the mylonitic shear zone superposed on that footwall below the Jiaoqier detachment fault,the fault itself,and its upper plate of diverse and structurally complicated Paleozoic and Proterozoic units.Muscovite 40Ar/39Ar cooling ages of 224 and 208 Ma from mylonitized Halatu plutonic rocks (U-Pb,252 Ma),and the post-extensional deposition of J1-2 strata across the footwall establish the age of the metamorphic core complex as Indosinian,i.e.Late Triassic to earliest Jurassic.Extension along the ENE-striking Jiaoqier detachment was SSW (～215°) in the study area.This first discovery of Indosinian extension within the Solonker suture zone joins other recently described examples of Late Triassic-Early Jurassic extension (ca.220～190 Ma) along ductile detachment faults in such widely separated areas of China as the Dabieshan-Sulu (Shandong) suture zone,and the Qiangtang metamorphic belt and the eastern Altyn Tagh range of the Tibetan plateau.Clearly,the nature of regional Indosinian-age deformation in eastern Asia requires reexamination.; 中文核心期刊要目总览(PKU); 中国科技核心期刊(ISTIC); 中国科学引文数据库(CSCD); 03; 135-144; 11
语种	中文
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/450433]
专题	地球与空间科学学院
推荐引用方式 GB/T 7714	XU Bei,ZHENG Ya-dong,ZHANG Wei-jie. 索伦缝合带中的印支期伸展作用:中国内蒙古苏尼特左旗变质核杂岩(英文), Indosinian extension in the Solonker suture zone: The Sonid Zuoqi metamorphic core complex, Inner Mongolia, China[J]. 地学前缘,2004.
APA	XU Bei,ZHENG Ya-dong,&ZHANG Wei-jie.(2004).索伦缝合带中的印支期伸展作用:中国内蒙古苏尼特左旗变质核杂岩(英文).地学前缘.
MLA	XU Bei,et al."索伦缝合带中的印支期伸展作用:中国内蒙古苏尼特左旗变质核杂岩(英文)".地学前缘 (2004).