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Geochemistry of Fluid Inclusions of the Basalt Copper Deposits in Adjacent Area of Northeastern Yunnan and Western Guizhou, China(PDF)

《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

Issue:
2011年第01期
Page:
14-23，33
Research Field:
基础地质与矿产地质
Publishing date:

Info

Title:
Geochemistry of Fluid Inclusions of the Basalt Copper Deposits in Adjacent Area of Northeastern Yunnan and Western Guizhou, China
Author(s):
LI Hou-min; MAO Jing-wen; ZHANG Chang-qing
Key laboratory of Metallogeny and Mineral Assessment of Ministry of Land and Resources,Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China
Keywords:
fluid inclusion;  palaeo-petroleum inclusion;  metallogenic fluid;  basalt copper mineralization;  adjacent area of northeastern Yunnan and western Guizhou
PACS:
P618.41
DOI:
-
Abstract:
In order to understand the characteristics of ore-forming fluids of the Emeishan basalt copper mineralization in adjacent area of northeastern Yunnan and western Guizhou, studies on the composition, homogenization temperature and salinity of the fluid inclusions and palaeo-petroleum inclusions in quartz and calcite of three metallogenic stages have been carried out by means of laser Ramman microprobe, fluorescent microscope and micro-thermometry. The results show that the ore-forming fluids of the first and the second metallogenic stages are of basinal saline fluids, which are composed of liquid H2O and gas CH4 with the ratios of gas to liquid 5%-10%, salinity of 8%-22%(mass fraction of NaCl), and homogenization temperatures range from 80 ℃ to 260 ℃, without liquid CO2 or daughter minerals. Besides, there also are palaeo-petroleum inclusions that are composed of liquid hydrocarbon dominating of fluorescent aromatic hydrocarbon, solid bitumen and gas phase with homogenization temperature from 30 ℃ to 290 ℃ in the second metallogenic stage. The ore-forming fluids in the third metallogenic stage are of meteoric source, which is composed of liquid and vapor H2O with the ratios of gas to liquid 5%-10%, lower salinity than 4%(mass fraction of NaCl), and homogenization temperatures mainly range from 140 ℃ to 200 ℃, without liquid CO2 or daughter minerals. The salinity of the ore-forming fluids decreases from the first stage to the third stage, especially low in the third stage, while the homogenization temperature changes slightly. The main ore depositions are developed in the second stage, which may resulted from the mixing of different ore-forming fluids, or mixing of ore-forming fluids and organic fluids with reduction of organic matter.

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Last Update: 2011-03-20