云南普朗斑岩铜矿蚀变带成矿流体特征及其成矿意义

现代地质 ›› 2009, Vol. 23 ›› Issue (3): 465-471.

云南普朗斑岩铜矿蚀变带成矿流体特征及其成矿意义

郭欣^1,2，杜杨松^1,2，庞振山¹，李顺庭¹，李青¹

1中国地质大学地质过程与矿产资源国家重点实验室，北京100083; 2中国地质大学地球科学与资源学院，北京100083

收稿日期:2009-01-12 修回日期:2009-05-10 出版日期:2009-06-20 发布日期:2011-12-21
作者简介:杜杨松，男，教授，博士生导师，1957年出生，岩石学专业，从事包体岩石学和矿床学的教学和科研工作。E-mail：duys5510@cugb.edu.com。
基金资助:
云南省地质矿产勘查开发局“云南香格里拉普朗铜矿成矿规律与成矿预测研究项目”（H02215）

Characteristics of the Ore-forming Fluids in Alteration Zones of the Pulang Porphyry Cupper Deposit in Yunnan Province and Its Metallogenic Significance

GUO Xin^1,2， DU Yang-Song^1,2，PANG Zhen-Shan¹， LI Shun-Ting¹， LI Jing¹

1State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing100083, China; 
2School of Earth Sciences and Resources, China University of Geosciences, Beijing100083, China

Received:2009-01-12 Revised:2009-05-10 Online:2009-06-20 Published:2011-12-21

摘要/Abstract

摘要：

云南普朗铜矿位于义敦—中甸岛弧带南缘，是近年来我国发现的一个大中型斑岩铜矿床。该矿床具有典型的斑岩铜矿蚀变分带，由中心向外依次为钾硅化带、绢英岩化带、青盘岩化带。对矿区不同蚀变带中的石英流体包裹体进行了岩相学观察、均一温度测量和激光拉曼探针成分分析。均一温度测量结果表明，从普朗斑岩铜矿床钾硅化带到绢英岩化带再到青盘岩化带，成矿流体的平均均一温度从274.4 ℃到236.4 ℃再到203.0 ℃，呈明显下降趋势，可能与天水参与成矿有关。同时，激光拉曼探针成分分析结果表明，普朗斑岩铜矿床矿化期间的成矿流体属于富硫富氯流体，这种温度较高且富硫富氯的成矿流体在钾硅化带和绢英岩化带发生矿化作用将导致成矿物质强烈富集成矿。

关键词: 斑岩铜矿, 蚀变分带, 成矿流体, 云南普朗

Abstract:

The Pulang porphyry copper deposit occurs in the southern segment of the Indosinian YidunZhongdian islandarc belt and is a largesized copper deposit discovered in China in recent years. This deposit has a typical alteration zonation of porphyry copper deposit, varying from potash and silicic alteration in the inner through phyllic alteration in the middle to propylitic alteration in the outer. This paper presents new petrographic observations, homogeneous temperature measurements and laser Raman microprobe analyses of fluid inclusions in quartz grains from the three alteration zones of the deposit. It is shown that the average homogeneous temperature of oreforming fluid decreases from 274.4 ℃ through 236.4 ℃ to 203.0 ℃ with outward variation of alteration zone and indicates an evident temperature decreasing trend, which may be resulted from partial participation of meteoric water in mineralization. The laser Raman microprobe analyzing data are consistent with existence of oreforming fluid with high sulfur and chlorine during mineralization in the deposit, and support occurrence of intensive mineralization caused by this high temperature oreforming fluid with high sulfur and chlorine in the potash and silicic and phyllic alteration zones.

Key words: porphyry copper deposit, alteration zonation, ore-forming fluid, Pulang in Yunnan Province

中图分类号:

P618.51

郭欣杜杨松庞振山李顺庭李青. 云南普朗斑岩铜矿蚀变带成矿流体特征及其成矿意义[J]. 现代地质, 2009, 23(3): 465-471.

GUO Xin DU Yang-Song LONG Zhen-Shan LI Shun-Ting LI Jing. Characteristics of the Ore-forming Fluids in Alteration Zones of the Pulang Porphyry Cupper Deposit in Yunnan Province and Its Metallogenic Significance[J]. Geoscience, 2009, 23(3): 465-471.

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