摘要
甘肃西成地区金矿床主要产在中泥盆统西汉水组和安家岔组的浅变质细碎屑岩中，金矿化类型为细脉浸染型，含金石英脉和脉旁蚀变围岩共同构成工业矿体。金矿化强度与石英脉带的规模和脉体内、外黄铁矿的含量成正比；与石英脉带的规整程度和脉体厚度成反比。一般情况下，从石英脉带的中心→边部→远离脉带，金品位渐次降低；围岩矿化与蚀变强度和旁侧石英脉的含金量成正比。石英脉带是宏观上直观的找矿标志。这种矿化规律与陕西八卦庙特大型金矿床非常相似。
The gold deposit discovered in the Xihe-Chengxian area,Gansu, are hosted in low-graded metamorphosed fine clastic rocks of Xihanshui Formation and Anjiacha Formation of Middle Devonian,which are characterized by veinlet and disseminated mineralization.The ore bodies comprise gold-bearing quartz vein and altered wall rock.Gold content varies in direct relation to development of quartz vein and pyrite,and in reverse proportion to evenness and thickness of veins.Gold content gradually decrease from the center of vein to its periphery.Mineralization of wall rocks is relative to alteration and gold content of quartz vein.Quartz vein serves a direct guide for prospecting.The metallogenic regulations similar to the Baguamiao large deposit of Shaanxi province predicate the favourable geological conditions and prospecting potential.
出处
《矿产勘查》
1998年第4期25-30,共6页
Mineral Exploration
关键词
金矿
石英脉
西成地区
甘肃
gold deposit
quartz vein
Xihe-Chengxian
Gansu
