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 > 北京大学 > 地球与空间科学学院

	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 ; Ji, Jianqing ; Wang, Dandan ; Gong, Junfeng ; Ma, Zongjin
刊名	international geology review
	2014
关键词	zircon U-Pb ages amphibolite-facies peak metamorphism Eocene-Oligocene the Ailao Shan-Red River shear zone FINITE STRAIN CALCULATIONS DIANCANG MOUNTAIN-RANGES LEFT-LATERAL SHEAR COLLISION ZONE CONTINENTAL EXTRUSION TECTONIC EVOLUTION SE ASIA METAMORPHIC COMPLEX WEST YUNNAN INDO-CHINA
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.; Geology; SCI(E); 3; ARTICLE; grsange@pku.edu.cn; 1; 74-87; 56
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/216885]
专题	地球与空间科学学院
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.
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.
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 (2014).