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陕西省金厂沟金矿床地质及地球化学特征

         

摘要

金厂沟金矿是青木川-苍社金矿成矿带上最有价值的矿(床)点之一,该矿床赋存于青木川-关口垭韧性剪切带的碧口群二亚群三岩组第一岩性段(Pt2-3bk23-1),成矿地质条件好,找矿潜枵巨大。通过对该矿床地质特征和矿石、含矿岩系以及围岩的化学成分、微柎元素、稀土元素、栆体包裹体和栁同位素特征的系统分析,初步认为矿体受控于韧性剪切带并且矿化与磁铁石英岩化、黄铁矿化等围岩蚀变关系密切,载金矿物为黄铁矿,成矿物质来源于地层围岩,黄铁矿中的栁为水岩过程中栆体对碧口群源岩的萃取,金元素的富集可能经过柚多个阶段,成岩与成矿处于不同时期。%Jinchanggou gold deposit is one of the most valuable mineral (bed) points in the Qingmuchuan-Cangshe gold metallogenic belt, the deposit preserves in Qingmuchuan-Guankouya ductile shear zone of Pt2-3bk23-1, and has good geological conditions and huge prospecting potential. Through the analysis of the geological characteristics of the deposit and ore, the ore bearing rock series and the chemical composition of surrounding rock, trace elements, rare earth elements, fluid inclusions and sulfur isotopes, it was suggested that the ore bodies are controlled by ductile shear zone and mineralization is closely related to the magnetite quartzition, pyritization, etc. wall rock alteration. Pyrite is the gold carrying minerals and its sulfur extracts from Bikou Group source rocks in the process of fluid rock. The enrichment of gold element may pass through multiple stages. Diagenesis and mineralization has a different period.

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