摘要
文章阐述了牛圈银矿隐爆角砾岩形成的地质背景、隐爆角砾岩的岩石特征,分析了隐爆角砾岩的物质来源、成岩方式及与银矿化的成因联系。查明隐爆角砾岩呈岩脉(墙)状沿断裂产出,复式角砾发育,角砾成分复杂,垂向、水平分带明显。隐爆角砾岩系深源富气体的火山熔浆,在地下封闭环境中经多次隐爆作用,沿断裂贯入而成。隐爆角砾岩形成之后,还经历了岩浆期后的气液活动和金属矿化过程,角砾岩体普遍含矿,复式角砾矿化强,隐爆角砾岩即是银矿体。
This paper discussed the geological background and characteristics of the eryptoexploded breccia in Niujuan silver deposit and analyzed its material source, rock-forming mechanism and relation to silver mineralization. The cryptoexploded breccica occurs as dykes along fractural zone and composite breccia developed with vertical and horizontal zoning. The cryptoexploded breccica is the deeply derived gas-rich, volcanic magma which was multiply cryptoexploded under closed ground environment then injected along the fractural zone. The cryptoexploded breccia was exposed to post-magma gas-fluid activities and metal mineralization thus it is ubiquitously mineralized. The composite hrecciation is associated with strong mineralization and the cryptoexploded breccia is the silver ore body.
出处
《地质找矿论丛》
CAS
CSCD
2009年第2期139-141,共3页
Contributions to Geology and Mineral Resources Research
关键词
牛圈银矿床
隐爆角砾岩
复式角砾
熔浆
河北省
Niujuan silver deposit
cryptoexploded breccica
composite breccia
magma
Hebei province
