Zircon U-Pb geochronology and trace element geochemistry of the;ore-bearing porphyry in Qingcaoshan porphyry Cu-Au deposit, Tibet, and;its geological significance

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	Zircon U-Pb geochronology and trace element geochemistry of the;ore-bearing porphyry in Qingcaoshan porphyry Cu-Au deposit, Tibet, and;its geological significance
	Zhou JinSheng 3; Meng XiangJin ; Zang WenShuan 1; Yang ZhuSen ; Xu YuTao 1; Zhang Xiong 1
刊名	ACTA PETROLOGICA SINICA
	2013
卷号	29 期号:11 页码:3755-3766
关键词	LA-ICPMS U-Pb geochronology Zircon trace element Zircon Ti thermometer Qingcaoshan Bangongco porphyry copper belt
ISSN号	1000-0569
英文摘要	The Qingcaoshan porphyry Cu-Au deposit, located in the southern Qiangtang Terrane, southern to northern Bangongco belt, is a newly discovered porphyry Cu-Au deposit, having tremendous potential. Zircon U-Pb geochronology and trace element geochemistry of the ore-bearing granodiorite porphyry in the Qingcaoshan is studied first time in this article. Based on the LA-ICPMS U-Pb geochronological investigation of 13 zircon grains in ore-bearing porphyry, the weighted average of (206)pb/(208) U age of 114. 60 +/- 1. 20Ma (MSWD = 0. 33) was attained. The age is consistent with the age of ore-bearing porphyry in the Duobuza porphyry Cu deposit and the metallogenic age of the Bolong porphyry Cu deposit, which also located in this belt. Using zircon Ti thermometer, the forming temperature of zircons was calculated and most of them less than 700 degrees C. Such a low crystallization temperature indicates that porphyry magma derived from rocks that experienced melting under near-water saturated conditions. The trace element geochemical investigation of zircons show that the Qingcaoshan porphyry Cu-Au deposit formed in continental arc, and that is consistent with the forming setting of the Duobuza porphyry Cu deposit from the predecessors' study. Similar diagenetic or metallogenic age and the same tectonic setting indicate that Bangongco porphyry copper belt exist objectively, which is mainly composed of the Qingcaoshan porphyry Cu-Au deposit, the Duobuza porphyry Cu deposit and the Bolong porphyry Cu deposit. Based on the geochemical characteristics of contemporaneous volcanic rocks in the Qingcaoshan and the Duobuza deposit and combined with the classical metallogenic model of porphyry copper deposits in arc settings, we proposed the geodynamic mechanism of Bangongco porphyry copper belt. In the early cretaceous, Bangongco oceanic crust is subducting northward. When subducted down to a proper depth, mass dehydration effect occurred in oceanic plate and it caused partial melting of mantle wedge. The magma enriched in Cu and other components, which produced by the partial melting migrate upward and develop into a magma chamber related to mineralization in shallow crust. Some of them erupt and form Meiriqiecuo Formation volcanic rocks. Particular part of them emplace in hypabyssal-ultra shallow crust and form porphyritic plutons or porphyry deposits. With the magma emplaced in the different time and place, finally Bangongco porphyry copper belt is formed.
学科主题	矿床地质
WOS关键词	HYDROTHERMAL ZIRCON ; VOLCANIC-ROCKS ; COPPER-DEPOSIT ; RUTILE ; BELT ; CRYSTALLIZATION ; THERMOMETERS ; TEMPERATURE ; GRANITOIDS ; EVOLUTION
WOS研究方向	Geology
语种	中文
出版者	SCIENCE PRESS
WOS记录号	WOS:000328441300009
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/40040]
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, Beijing 100037, Peoples R China. 2.China Univ Geosci, Beijing 100083, Peoples R China. 3.中国地质科学院矿产资源研究所
推荐引用方式 GB/T 7714	Zhou JinSheng,Meng XiangJin,Zang WenShuan,et al. Zircon U-Pb geochronology and trace element geochemistry of the;ore-bearing porphyry in Qingcaoshan porphyry Cu-Au deposit, Tibet, and;its geological significance[J]. ACTA PETROLOGICA SINICA,2013,29(11):3755-3766.
APA	Zhou JinSheng,Meng XiangJin,Zang WenShuan,Yang ZhuSen,Xu YuTao,&Zhang Xiong.(2013).Zircon U-Pb geochronology and trace element geochemistry of the;ore-bearing porphyry in Qingcaoshan porphyry Cu-Au deposit, Tibet, and;its geological significance.ACTA PETROLOGICA SINICA,29(11),3755-3766.
MLA	Zhou JinSheng,et al."Zircon U-Pb geochronology and trace element geochemistry of the;ore-bearing porphyry in Qingcaoshan porphyry Cu-Au deposit, Tibet, and;its geological significance".ACTA PETROLOGICA SINICA 29.11(2013):3755-3766.