摘要
通过研究,碳酸盐化可划分为五个阶段,其中硫化物早期碳酸盐化与铜矿化关系密切。 碳氧同位素和铷锶同位素研究表明,夕卡岩阶段单晶体方解石和氧化物阶段方解石形成于以岩浆水为主的热液中;石英硫化物期方解石形成于以岩浆水和地下热雨水为主的混合热液中。
The Tongshan copper deposit in Guichi can be considered as a copper-bearing ore deposit of skarn type. Multi-stage carbonatization was well developed in the skarn zone and copper-bearing orebodies. Mineralogy, mineral chemistry and stable isotope data allows it to be divided into five stages: (1) carbonatization of single calcite crystals in the skarn stage; (2) calcite carbonatization in the oxide stage; (3) carbonatization in the early sulfide stage; (4) carbonatization in the late sulfide stage and (5) carbonatization in the post-sulfide stage. Carbonatization in the early sulfide stage is, among other things, closely related to copper mineralization and is one of the alteration indicators of copper mineralization of this type.C, O, Rb and Sr isotopic studies indicate that the calcites of skarn and oxide stages were formed in hydrothermal solutions predominated by magmatic water, and those of sulfide stage were formed in hydrothermal solutions mainly involving heated meteoric water. The former was formed in the environment where fO2(fO2> 10-33 and 10-33 > fO2 > 10 -36)(pH = 7 - 8) is high as compared with the latter (10-35 > fO2 > 10-38;pH = 5 - 7).
出处
《地球化学》
CAS
CSCD
北大核心
1990年第2期127-136,共10页
Geochimica
