Characteristics and origin of ore-forming fluids of Jinchangqing gold (copper) ore deposit (s) in Xiangyun, Yunnan Province
| Autor: | Song Huanbin, Li Chaoyang, He Mingqin, Liu Jiajun |
|---|---|
| Rok vydání: | 2005 |
| Předmět: | |
| Zdroj: | Chinese Journal of Geochemistry. 24:136-143 |
| ISSN: | 1993-0364 1000-9426 |
| DOI: | 10.1007/bf02841156 |
| Popis: | On the basis of results of the studies of primary fluid inclusions, and the hydrogen and oxygen isotope data, the authors concluded that the early-stage ore-forming fluid from the Jinchangqing gold (copper) ore deposit is a kind of sulfate type hot brine characterized by medium temperature and salinity, genetically related to the late-stage ore-forming fluid derived from an acidic and more reductive environment. However, the late-stage ore-forming fluid is a sort of low temperature and low salinity chloride-type hot brine which originated from a lower pressure, acidic and more oxidative environment. In general, the ore fluids were derived from the late-stage, or largely from the early-stage groundwater-derived meteoric water, which has a 12% – 17% heavier oxygen isotopic composition than the original rain water (δ18O = — 15. 3%), and were formed during gold mineralization as a product of oxygen isotope exchange during the reaction between ore-forming fluid and wall rocks under a lower water/rock ratio condition. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|