青海波洛尕熊地区多金属矿成因分析及找矿标志

Geological background and prospecting criteriain of the gold polymetallic ore at Boluogaxiong area in Qinghai province

为了研究波洛尕熊地区内地层、构造、岩浆岩、成矿规律及矿化蚀变等地质特征,采用1∶1万地质草测、岩石剖面、地化综合手段等有效方法手段对区内水系沉积物异常、矿化有利地段进行查证,寻找矿化有利地段。对地表已发现矿体及矿化有利地段利用物探剖面及槽探工程进行追索控制,了解矿体的规模、产状及品位变化等情况。结果表明:通过岩石剖面在构造蚀变岩中圈定金矿(化)体3条。新发现的3条的金矿体及2条铜矿体均产于岩体内的构造破碎蚀变带中。矿床成因初步认为是构造蚀变岩型。花岗闪长岩中的硅化带和硅铁蚀变带、地表强氧化带、构造的交切及开启和产状变化部位、金的高异常区是该区找矿的主要标志。

In order to study the geological characteristics of strata,structure,magmatite,metallogenic regularity and mineralization alteration of Boluogaxiong area,the 1 ∶10 000 geological surveying map,rock profile and geochemical comprehensive means were applied to investigate stream sediment anomalies and favorable mineralization zone. The discovered surface ore body,geophysical profiles of favorable mineralized areas and trenching engineering were recourse controlled to understand the size of the ore body,production and grade changes. Three gold（ mineralized） bodies were delineated in the structural altered rock by means of rock sections. The newly discovered three gold bodies and 2 copper ore bodies are all found in the structural fracture zone of the rock. The genesis of the deposit is considered as a structural altered rock type. The main indicators for the prospecting in the area are the silicified zone and the altered zone of silicon in the granodiorite,the strong oxidation zone of the earth＇s surface,the intersection and opening of the structure and the location of the change of its position and the high abnormal area of gold.