Re-Os dating of the Pulang porphyry copper deposit in Zhongdian, NW;Yunnan, and its geological significance

	Re-Os dating of the Pulang porphyry copper deposit in Zhongdian, NW;Yunnan, and its geological significance
	Zeng, PS 4; Hou, ZQ ; Wang, HP ; Qu, WJ ; Meng, YF ; Yang, ZS ; Li, WC
刊名	ACTA GEOLOGICA SINICA-ENGLISH EDITION
	2004
卷号	78 期号:2 页码:604-609
关键词	Re-Os dating porphyry copper Pulang Zhongdian Yunnan China
ISSN号	1000-9515
英文摘要	The Pulang porphyry copper deposit is located in the Zhongdian island arc belt, NW Yunnan, in the central part of the Sanjiang area, SW China, belonging to the southern segment of the Yidun island arc belt on the western margin of the Yangtze Platform. In the Yidun island arc, there occur well-known "Gacun-style" massive sulfide deposits in the northern segment and plenty of porphyry copper deposits in the southern segment, of which the Pulang porphyry copper deposit is one of the representatives. Like the Yulong porphyry copper deposit, this porphyry copper deposit is also one of the most important porphyry copper deposits in the eastern Qinghai-Tibet Plateau. But it is different from other porphyry copper deposits in the eastern Qinghai-Tibet Plateau (e.g. those in the Gangdise porphyry copper belt and Yulong porphyry copper belt) in that it formed in the Indosinian period, while others in the Himalayan period. Because of its particularity among the porphyry copper deposits of China, this porphyry copper deposit is of great significance for the study of the basic geology and the evaluation and prediction of mineral resources in the Zhongdian island arc belt. However, no accurate chronological data are available for determining the timing of mineralization of the porphyry copper deposit. By field observation in the study area and Re-Os dating of molybdenite and K-Ar dating of hydrothermal minerals and whole rock from the typical geological bodies, the timing of mineralization of the porphyry copper deposit has systematically been determined for the first time. The K-Ar age for the hydrothermal mineralization of biotite-quartz monzonitic porphyry that has undergone patassic silicate (biotite and K-feldspar) alteration ranges from 235.4+/-2.4 to 221.5+/-2.0 Ma and the Re-Os age for molybdenite in the quartz-molybdenite stage is similar to213+/-3.8 Ma. These data are very close to each other, suggesting that the ore-forming processes of the Pulang porphyry copper deposit was completed in the Indosinian. But the K-feldspar K-Ar age of the main orebodies suggests that the hydrothermal activity related to porphyry copper mineralization continued till similar to182.5+/-1.8 Ma. This indicates that the lifespan of the hydrothermal system related to porphyry copper mineralization may have lasted at least 40 Ma. This hydrothermal thermal system with such a long lifespan may be one of the necessary conditions for forming large porphyry copper deposits with a high grade. No late Yanshanian and/or Himalayan magmatism (mineralization) were superimposed in the Pulang porphyry copper deposit.
学科主题	矿床地质
WOS关键词	MO
WOS研究方向	Geology
语种	英语
出版者	GEOLOGICAL SOC CHINA
WOS记录号	WOS:000222640600037
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/37717]
专题	中国地质科学院地质研究所
作者单位	1.Chinese Acad Geol Sci, Inst Mineral Resources, Beijing 100037, Peoples R China. 2.Chinese Acad Geol Sci, Natl Res Ctr Geoanal, Beijing 100037, Peoples R China. 3.Yunnan Inst Geol Survey, Kunming 651000, Yunnan, 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	Zeng, PS,Hou, ZQ,Wang, HP,et al. Re-Os dating of the Pulang porphyry copper deposit in Zhongdian, NW;Yunnan, and its geological significance[J]. ACTA GEOLOGICA SINICA-ENGLISH EDITION,2004,78(2):604-609.
APA	Zeng, PS.,Hou, ZQ.,Wang, HP.,Qu, WJ.,Meng, YF.,...&Li, WC.(2004).Re-Os dating of the Pulang porphyry copper deposit in Zhongdian, NW;Yunnan, and its geological significance.ACTA GEOLOGICA SINICA-ENGLISH EDITION,78(2),604-609.
MLA	Zeng, PS,et al."Re-Os dating of the Pulang porphyry copper deposit in Zhongdian, NW;Yunnan, and its geological significance".ACTA GEOLOGICA SINICA-ENGLISH EDITION 78.2(2004):604-609.