| Formation Mechanism of the Tongyu Gold Deposit,Shaanxi——A Discussion of a Model for the Formation of Syntectonic Gold Deposits |
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| 摘 要： | The formation of the Tongyu gold deposit, controlled by regional polyphase deformation-metamorphism.is closely related to the regional composite antiform-shear slip fracture zone. Late-stage reworking of theTaihua Group accounts for the enrichment of ore substances. It is a typical syntectonic gold deposit. The formation and evolution of the deposit involved four stages: (Ⅰ) the state of preparation of ore sub-stances, in which primary source beds originated: (Ⅱ) the stage of remobilization of ore substances, in whichregional progressive metamorphism and migmatization and thermodynamic-chemical differentiation led toremobilization of gold and its initial local concentration: (Ⅲ) the stage of gold deposit formation, in which re-gional folding produced concordant and cross shear-slip fractures and under the dynamic action gold was sepa-rated and migrated in a certain direction and concentrated to form a gold deposit: (Ⅳ) the stage ofsuperpositon, reworking and exposure of orebodies, in which the block uplifted and the deposit againunderwent reworking through faulting and mechanical differentiation.Thermodynamic mineralization played adominant role in the formation of the deposit.
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Formation Mechanism of the Tongyu Gold Deposit,Shaanxi —— A Discussion of a Model for the Formation of Syntectonic Gold Deposits |
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| Authors: | Hu Zhengguo Qian Zhuangzhi |
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| Abstract: | Abstract The formation of the Tongyu gold deposit, controlled by regional polyphase deformation-metamorphism, is closely related to the regional composite antiform-shear slip fracture zone. Late-stage reworking of the Taihua Group accounts for the enrichment of ore substances. It is a typical syntectonic gold deposit. The formation and evolution of the deposit involved four stages: ( I ) the stage of preparation of ore substances, in which primary source beds originated; (II ) the stage of remobilization of ore substances, in which regional progressive metamorphism and migmatization and thermodynamic-chemical differentiation led to remobilization of gold and its initial local concentration; (III) the stage of gold deposit formation, in which regional folding produced concordant and cross shear-slip fractures and under the dynamic action gold was separated and migrated in a certain direction and concentrated to form a gold deposit; (IV ) the stage of superpositon, reworking and exposure of orebodies, in which the block uplifted and the deposit again underwent reworking through faulting and mechanical differentiation. Thermodynamic mineralization played a dominant role in the formation of the deposit. |
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