The geochemical evolution of syncollisional magmatism and the   implications for significant magmatic-hydrothermal lead-zinc   mineralization (Gangdese, Tibet)

doi:10.1016/j.lithos.2017.07.004

CORC > 北京大学 > 地球与空间科学学院

	The geochemical evolution of syncollisional magmatism and the implications for significant magmatic-hydrothermal lead-zinc mineralization (Gangdese, Tibet)
	Zhou, Jinsheng ; Yang, Zhusen ; Hou, Zengqian ; Liu, Yingchao ; Zhao, Xiaoyan ; Zhang, Xiong ; Zhao, Miao ; Ma, Wang
刊名	LITHOS
	2017
关键词	Gangdese Syncollision Magmatic-hydrothermal Pb-Zn deposit High silica granite Magmatic evolution INDIA-ASIA COLLISION S-TYPE GRANITES PORPHYRY CU-MO SOUTHERN TIBET CONTINENTAL-CRUST ARC MAGMAS OXIDATION-STATE LHASA TERRANE U-PB OXYGEN FUGACITY
DOI	10.1016/j.lithos.2017.07.004
英文摘要	In addition to well-known subduction processes, the collision of two continents also generates abundant ore deposits, as in the case of the Tibetan Plateau, which is the youngest and most spectacular collisional belt on Earth. During the building history of the Gangdese magmatic belt, several magmatic flare-up events developed, however, significant magmatic-hydrothermal lead-zinc mineralization dominantly accompanied the magmatism during the syncollisional period (similar to 65-41 Ma). Based on integrated geochemical and isotopic data, we provide insights into the genesis and evolution of syncollisional magmas, and their implications for significant magmatic-hydrothermal lead-zinc mineralization. The Sr-Nd isotopic compositions of most syncollisional igneous rocks (Sr-87/Sr-86 = 0.7034-0.7123; epsilon(Nd(t)) =-9.0 to + 1.8) indicate a mixing origin between mantle-derived basaltic magmas and ancient crustal melts, and fractional crystallization is a fundamental mechanism by which syncollisional magmas evolve towards intermediate to silicic compositions. Most lead-zinc mineralization related plutons are high silica (76.14% wt.% SiO2 on average), high oxygen fugacity (average Delta FMQ + 2.5) granites with highly evolved chemical signatures [average Eu-n/Eu-n* = 033, high Rb/Sr (average = 3.9)], and they represent the final products from primary magmas. Due to the contribution of ancient crustal melts to the genesis of mineralization-related parent magmas, the spatial distribution of Pb-Zn deposits within the northern Gangdese magmatic belt is controlled by the lithospheric architecture. In compressional environments, magmas have low evacuation efficiency and long magma chamber lifespan, which isfavorable for basaltic parents evolved to high silica granites through sufficient fractional crystallization. This scenario contributes to our understanding of the significant magmatic-hydrothermal lead-zinc mineralization that occurred in the syncollisional period. (C) 2017 Elsevier BM, All rights reserved.; SCI(E); ARTICLE; 143-155; 288
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/471036]
专题	地球与空间科学学院
推荐引用方式 GB/T 7714	Zhou, Jinsheng,Yang, Zhusen,Hou, Zengqian,et al. The geochemical evolution of syncollisional magmatism and the implications for significant magmatic-hydrothermal lead-zinc mineralization (Gangdese, Tibet)[J]. LITHOS,2017.
APA	Zhou, Jinsheng.,Yang, Zhusen.,Hou, Zengqian.,Liu, Yingchao.,Zhao, Xiaoyan.,...&Ma, Wang.(2017).The geochemical evolution of syncollisional magmatism and the implications for significant magmatic-hydrothermal lead-zinc mineralization (Gangdese, Tibet).LITHOS.
MLA	Zhou, Jinsheng,et al."The geochemical evolution of syncollisional magmatism and the implications for significant magmatic-hydrothermal lead-zinc mineralization (Gangdese, Tibet)".LITHOS (2017).