摘要
含铁白云石是双王金矿床矿体和围岩中的主要矿物,按其产状可分为四类:Ⅰ.产于层状钠质岩(矿体围岩)中的含铁白云石;Ⅱ.产于含金角砾岩体钠质岩角砾中的含铁白云石;Ⅲ.产于含金角砾岩胶结物中的含铁白云石,Ⅳ.产于近矿蚀变岩石中的含铁白云石。Ⅰ,Ⅱ类为热水沉积成因,Ⅲ和Ⅳ类为热液充填交代产物;它们在化学成分、有序度及碳氧同位素等方面有许多相似之处,但又有一定的差别。研究表明,含金角砾岩胶结物中的含铁白云石主要来自层状钠质岩,为矿床的热水沉积—改造成因提供了新的证据。
Ferruginous dolomite is the main mineral in both orebody and country rocks in the Shuangwang gold ore deposit. According to their modes of occurrence, ferruginous dolomites are divided into four types. Type I occurs in the stratiform albite rocks,type II in the angular coarse fragments of the breccia bodies,type III in the cements of the breccia bodies, and type IV in the altered rocks near ore bodies . Type I and II were formed from hot-water deposit;type III and IV were formed from hydrothermal fluid. Type I and II are similar to type III and IV in the chemical composition, degree of order, δ^(13)C and δ^(18)O values. The results show clearly that the ferruginous dolomite in the breccia bodies originated from stratiform albite rock. This study provides fresh evidence for origin of ore deposit which was formed from'hotwater sedimention-reformation'.
出处
《矿物岩石》
CAS
CSCD
1993年第4期27-33,共7页
Mineralogy and Petrology
基金
国家自然科学基金(4880093)
关键词
金矿床
铁
白云石
标型特征
ferruginous dolomite
typomorphic features
Shuangwang gold ore deposit
