摘要
桂东大瑶山地区的金矿主要产于寒武系具浊流沉积特征的浅变质含碳质碎屑岩中 ,受地层岩性及断层破碎带控制明显 ,岩浆侵入活动相对较弱 ,仅出露有加里东期、燕山期及喜山期的中 -酸性小岩株和岩脉 ,除加里东期花岗闪长斑岩破碎带中产有金矿化体或金矿体外 ,其它各期岩体均未见明显的金矿化。金矿化类型主要为硅化石英脉型和硅化破碎带蚀变岩型。区内的金矿化主要与地层建造有关 ,成矿物质主要来源于地层 ,属地下水热液改造破碎带蚀变岩型金矿。
Dayaoshan region is one of the most important gold-producing areas in Eastern Guangxi, where more than 200 gold deposits(or spots) have been found, the larger ones being Liuqin, Taohua and Gupao deposits. The gold deposits mainly occure in Cambrian C-bearing epimetamorphic clastic rocks characterized by turbidity current deposit, and are obviously controlled by stratigraphic characters and fractured fault zone. Magmatic intrusion in the study area is relatively weaker, where only Caledonian,Yanshanian and Himalayan intermediate-acidic small typhons and dikes are found. Besides a little gold mineralization or gold body in the fractured zones of Caledonian granodiorite-porphyry, there are not obvious gold mineralization in the other epoch bodies.The mineralization types mainly are silicified quartz reef-type and silicified shattered zone-altered rock-type. The preliminary investigation shows that gold mineralization in this region is chiefly related to the stratigraphic formation and that mineralization materials are derived from the strata. Therefore,it should belong to the fractured zone-altered rock-type gold deposit changed by the underground-water hydrothermal solution.
出处
《地质科技情报》
CAS
CSCD
北大核心
2004年第2期37-44,共8页
Geological Science and Technology Information
基金
中国地质调查局地质大调查项目"云开地区综合找矿评价"( 199910 2 0 0 85 0 0 3 )
关键词
桂东大瑶山
破碎带
蚀变岩
金矿化
Dayaoshan of Eastern Guangxi
shattered zone
altered rock
gold mineralization
