The discovery of late Triassic mylonitic granite and geologic   significance in the middle Gangdese batholiths, southern Tibet

doi:10.1016/j.jog.2016.10.007

CORC > 北京大学 > 地球与空间科学学院

	The discovery of late Triassic mylonitic granite and geologic significance in the middle Gangdese batholiths, southern Tibet
	Ma, Shiwei ; Meng, Yuanku ; Xu, Zhiqin ; Li, Xiaojia
刊名	JOURNAL OF GEODYNAMICS
	2017
关键词	Zircon U-Pb ages and Lu-Hf isotopes Geochemistry Mylonitic granite Late triassic Gangdese batholiths ZIRCON U-PB LACHLAN FOLD BELT LHASA TERRANE IMPLICATIONS VOLCANIC-ROCKS HF-ISOTOPE NEO-TETHYS TECTONIC SIGNIFICANCE ARC MAGMAS S-TYPE LU-HF
DOI	10.1016/j.jog.2016.10.007
英文摘要	The Gangdese magmatic belt, located in the southern margin of the Lhasa terrain and carrying significant copper poly-metallic mineralization, preserves important information related to the tectonics associated with the Neo-Tethys Ocean subduction, Indian-Asian collision and the crustal growth of southern Tibet. Here, we investigated the Namling batholiths in the central domain of the Gangdese magmatic belt and report for the first time the occurrence of late Triassic mylonitic granite, and present its petrologic, zircon U-Pb-Hf isotopes and the whole-rock chemistry dataset. Zircon LA-ICP-MS U-Pb dating from three mylonitic granitic samples yields crystallization ages of 209.41 +/- 1.1 Ma, 206.7 +/- 1.1 Ma and 212 +/- 1.1Ma, indicating a late Triassic magmatic event in the Gangdese magmatic belt. Geochemically, the mylonitic granite exhibits magnesian genesis and calcic and calc-alkalic features. The depletions of Nb, Ta and Ti and enrichments of LREEs together suggest that the magmas from which these rocks crystallized were generated in an active continental margin. Besides, all the analyzed samples also demonstrate highly positive epsilon(Hf)(t) values of 8.95-12.91 (mean value 10.84), corresponding to single stage model ages (t(DM1)) in the range of 326 Ma-486 Ma (mean 414 Ma), attesting to crustal growth in southern Lhasa terrain. The mylonitic pluton are likely sourced from partial melting of the lower crustal components (amphibolite or basaltic stuff) that was heated and metasomatized by underplating basaltic magmas, and subsequently might undergo fractional crystallization and upper sediments contamination during parental magmas ascent. In light of the distribution of the early Mesozoic magmatic events and robust sedimentary evidence together suggest that the northward subduction of the Neo-Tethys oceanic crust beneath the Lhasa terrain should commence prior to late Triassic (similar to 210 Ma). (C) 2016 Elsevier Ltd. All rights reserved.; National Natural Science Foundation of China [40921001, 41002076]; Geological Survey of China [1212011121275, 12120115026801]; SCI(E); ARTICLE; 49-64; 104
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/475314]
专题	地球与空间科学学院
推荐引用方式 GB/T 7714	Ma, Shiwei,Meng, Yuanku,Xu, Zhiqin,et al. The discovery of late Triassic mylonitic granite and geologic significance in the middle Gangdese batholiths, southern Tibet[J]. JOURNAL OF GEODYNAMICS,2017.
APA	Ma, Shiwei,Meng, Yuanku,Xu, Zhiqin,&Li, Xiaojia.(2017).The discovery of late Triassic mylonitic granite and geologic significance in the middle Gangdese batholiths, southern Tibet.JOURNAL OF GEODYNAMICS.
MLA	Ma, Shiwei,et al."The discovery of late Triassic mylonitic granite and geologic significance in the middle Gangdese batholiths, southern Tibet".JOURNAL OF GEODYNAMICS (2017).