青海白石崖铁矿成矿地质特征及找矿标志

白石崖铁矿产于下石炭统大干沟组中,其岩性为砂岩、细砾岩、灰岩、页岩、石英砂岩或长石砂岩等.华力西-印支期花岗岩类岩体和晚三叠世火山岩广泛分布.矿区构造复杂,具多期次性、继承性和多机制特点.断裂发育,且规模较大,具时空展布多向和多期的特点.矿区围岩蚀变较发育,蚀变机制主要有热变质作用和接触交代变质作用,其中,后者作用普遍...

Geological Characteristics and Prospecting Indicators of Baishiya Iron Deposit, Qinghai Province

Baishiya iron deposit produces in the Early Carboniferous Dagangou group,its lithology includes:sandstone,conglomerates,limestone,shale,quartz sandstone or feldspathic sandstone and so on.Granitoids and Late Triassic volcano rocks of Hercynian and Indosinian widely distribute.The structure of mining in this area is complex,which has characteristics of multi-stage,inheritance and multiple mechanisms of tectonic.Fault strongly develop with large scale and space-time distribution characteristics of multi-phase and multi-directional.Wallrock alteration is developed,which mainly includes thermal metamorphism and contact metasomatic metamorphism,and the latter is more complex and more closely related to mineralization.17 magnetic anomalies have been found in Baishiya iron deposit,we suggest that magnetic anomaly is mainly caused by magnetite based on the inspection of magnetic anomalies.Through the magnetic anomaly geological work,we understand the mine geology and the ore deposit geological feature of the Baishiya iron deposit,we also sum up prospecting criteria,and finally delineate 47 iron orebodies and 11 lead-zinc-copper orebodies.Because of the sand cover is thick,most of the orebodies are blind orebodies.Baishiya iron deposit belongs to contact metasomatic skarn deposits.