Determination of Eocene-Oligocene (30-40 Ma) deformational time by zircon U-Pb SHRIMP dating from leucocratic rocks in the Ailao Shan-Red River shear zone, southeast Tibet, China

doi:10.1080/01431161.2013.819960

CORC > 中国地质调查局 > 中国地质调查局 > 中国地质科学院矿产资源研究所

	Determination of Eocene-Oligocene (30-40 Ma) deformational time by zircon U-Pb SHRIMP dating from leucocratic rocks in the Ailao Shan-Red River shear zone, southeast Tibet, China
	Li, Baolong 4; Ji, Jianqing 1; Wang, Dandan 2; Gong, Junfeng 1; Ma, Zongjin 1
刊名	INTERNATIONAL GEOLOGY REVIEW
	2014
卷号	56 期号:1 页码:74-87
关键词	zircon U-Pb ages amphibolite-facies peak metamorphism Eocene-Oligocene the Ailao Shan-Red River shear zone
ISSN号	0020-6814
DOI	10.1080/01431161.2013.819960
英文摘要	The Ailao Shan-Red River (ASRR) shear zone, a long, narrow metamorphic belt that strikes NW-SE, is the continuation of the southeastern margin of the Tibetan Plateau. It mainly comprises amphibolite-facies mylonitic gneiss. In this study, we report zircon concordant U-Pb SHRIMP ages of 37.52Ma +/- 0.67Ma [mean square weighted deviation (MSWD)=1.4] and 30.8Ma +/- 0.3Ma (MSWD=3.2) from a granitic gneiss in the northern part of the Ailao Shan metamorphic belt, and from a leucogranitic dike in the middle of the zone, respectively. Zircon U-Pb ages between 35 Ma and 41Ma were also obtained from a biotite gneissic granite in the southern part of the belt. Contrasting the internal structure of the zircon crystals with our new U-Pb dating suggests that their nucleation and growth initiated during a late Eocene tectonic uplift event between ca. 40 and 35 Ma. Detailed field observations and zircon U-Pb dating results suggest that the deformation time of mylonitic gneiss and granitic gneiss in the ASRR was 40-30 Ma, the formation age of the gneissic schistosity of the ASRR metamorphic belt was as early as ca. 40Ma.
学科主题	变质岩岩石学
WOS关键词	FINITE STRAIN CALCULATIONS ; DIANCANG MOUNTAIN-RANGES ; LEFT-LATERAL SHEAR ; COLLISION ZONE ; CONTINENTAL EXTRUSION ; TECTONIC EVOLUTION ; SE ASIA ; METAMORPHIC COMPLEX ; WEST YUNNAN ; INDO-CHINA
WOS研究方向	Geology
语种	英语
出版者	TAYLOR & FRANCIS INC
WOS记录号	WOS:000325197600005
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/40376]
专题	中国地质科学院矿产资源研究所
作者单位	1.Chinese Acad Geol Sci, Inst Mineral Resources, MLR Key Lab Metallogeny & Mineral Assessment, Beijing 100037, Peoples R China 2.Peking Univ, Sch Earth & Space Sci, Key Lab Orogen & Crustal Evolut, Beijing 100871, Peoples R China 3.China Geol Survey, Oil & Gas Survey, Beijing 100029, Peoples R China 4.中国地质科学院矿产资源研究所
推荐引用方式 GB/T 7714	Li, Baolong,Ji, Jianqing,Wang, Dandan,et al. Determination of Eocene-Oligocene (30-40 Ma) deformational time by zircon U-Pb SHRIMP dating from leucocratic rocks in the Ailao Shan-Red River shear zone, southeast Tibet, China[J]. INTERNATIONAL GEOLOGY REVIEW,2014,56(1):74-87.
APA	Li, Baolong,Ji, Jianqing,Wang, Dandan,Gong, Junfeng,&Ma, Zongjin.(2014).Determination of Eocene-Oligocene (30-40 Ma) deformational time by zircon U-Pb SHRIMP dating from leucocratic rocks in the Ailao Shan-Red River shear zone, southeast Tibet, China.INTERNATIONAL GEOLOGY REVIEW,56(1),74-87.
MLA	Li, Baolong,et al."Determination of Eocene-Oligocene (30-40 Ma) deformational time by zircon U-Pb SHRIMP dating from leucocratic rocks in the Ailao Shan-Red River shear zone, southeast Tibet, China".INTERNATIONAL GEOLOGY REVIEW 56.1(2014):74-87.