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青海省贵德县德特日金铜矿床地质特征、控矿因素及找矿标志

Geological characteristics,ore-controlling factors and prospecting criteria of Deteri Gold Copper Deposit,Guide County,Qinghai Province

  • 摘要: 德特日金铜矿床位于西秦岭成矿带西段,是典型的矽卡岩型矿床。采用1∶1万地质草测、1∶1万土壤剖面、1∶2 000岩石剖面和槽探等手段,在研究区内发现矿化带4条,圈定金铜矿(化)体13条。研究表明,矿(化)体主要赋存于隆务河组结晶灰岩和印支期花岗闪长岩接触带中,隆务河组结晶灰岩、印支期花岗闪长岩及北西向断裂构造是主要的控矿因素。印支期花岗闪长岩与隆务河组结晶灰岩接触带、北西向断裂构造及矽卡岩化、碳酸盐化、褐铁矿化、孔雀石化、黄铁矿化等围岩蚀变可作为主要的地质找矿标志;以Cu、Au元素为主,组合元素为Li、As、Sb、W、Bi等的土壤异常为主要的地球化学找矿标志。

     

    Abstract: Deteri Gold Copper Deposit,located in at the west part of west Qinling metallogenic belt,is a typical skarn type deposit.Via 1∶10 000 geological preliminary survey,1∶10 000 soil profile,1∶2 000 rock profile and trenching,four mineralization belts were discovered in the study area,and 13 gold copper ore(mineralization) bodies were delineated.The study shows that the ore(mineralization) bodies mainly occur in the contact zone of Longwuhe Formation crystalline limestone and Indosinian granodiorite,and the Longwuhe Formation crystalline limestone,Indosinian granodiorite and the NW fault structure are the main ore-controlling factors.The contact zone of Longwuhe Formation crystalline limestone and Indosinian granodiorite,the NW fault structure and wall rock alteration such as skarnization,carbonatization,ferritization,malachitization and pyritization can be the main geological prospecting criteria.The soil anomalies dominated by Cu and Au element,followed by Li,As,Sb,W and Bi element combination can be the main geochemical prospecting criteria.

     

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