Regional Metallogenesis of the Chang'an Gold Ore Deposit in Western Yunnan:Evidences from Fluid Inclusions and Stable Isotopes

被引：4

作者：

TRAN My Dung ^{[1
]}

机构：

[1] Hanoi University of Geology and Mining,Hanoi,Vietnam

来源：

Acta Geologica Sinica(English Edition) | 2010年 / 84卷 / 06期

关键词：

Indian-Eurasian continental collision; Ailaoshan metallogenic belt; high potassic alkaline magmatism; epithermal gold deposit; Western Yunnan;

D O I：

暂无

中图分类号：

P618.51 [金];

学科分类号：

0709 ; 081803 ;

摘要：

The Chang’an gold ore deposit in western Yunnan is located at the southern segment of the Ailaoshan metallogenic belt.The ore bodies are preserved in fractured Ordovician sedimentary clastic rocks.The gold-bearing minerals occur dominantly in sulfide-quartz veins.Fluid inclusion analysis shows that the Chang’an gold ore deposit is characterized by epithermal gold mineralization at temperatures between 200℃and 280℃at a shallow crustal level.The mineralizing fluids have intermediate to low salinity(6%-18%) and low densities(0.72-1.27 g/cm~3).The ore minerals haveδ34S in a range from -13‰to 3.57‰,concentrated from -2.06‰to 3.57‰with an average of 1.55‰.The206Pb/204Pb,207Pb/204Pb and208Pb/204Pb values are 18.9977-19.5748,15.7093-15.784,39.3814-40.2004 respectively.These isotope data suggest that the ore-forming elements were mainly derived from mixed crustal and mantle sources.The Chang’an gold ore deposit and Tongchang Cu-Mo deposit are closely related to each other in their spatial distribution and age of formation.They have similar sources of mineralizing elements and identical ore-forming metal elements,and show a close relationship in physical and chemical conditions of mineralization.The two deposits constitute an epithermal-porphyry -skarn type Cu-Mo-Au mineralization system in the Tongchang-Chang’an area,which is related to the Cenozoic high-K alkaline magmatism.

引用

页码：1401 / 1414

页数：14

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