甘肅省沃爾給花崗巖體中黑云母的成分對其巖體堿度的響應(yīng)及成巖成礦意義
[Abstract]:The formation of the deposit is closely related to the genesis and petrochemical properties of the ore-forming geological body, so it is necessary to study the relationship between the alkalinity of rock mass and mineralization. The main elements of biotite in 52 ore deposits in China were analyzed by sampling and testing of granitic bodies in Wolle, Gansu Province, and the alkalinity of host rocks was distinguished. The main elements of biotite in ore-forming related rocks in China were statistically analyzed and analyzed in order to distinguish the alkalinity of host rocks. The results show that the rock bodies related to Cu,Au mineralization in the study area are located in the region with high alkalinity, and those related to the formation of Sn ore belong to low alkalinity rock series. From the early stage of the magma melt to the hydrothermal stage of the late magmatic stage, the oxygen fugacity changes from high to low, and the alkalinity of the medium increases gradually. The formation of the Cu,Au deposit generally goes through the diagenetic ore-forming process mentioned above. In the early stage of magmatic crystallization, low oxygen fugacity and high basicity are beneficial to the activation and migration of Sn. High oxygen fugacity in post-magmatic hydrothermal phase and low basicity are beneficial to cassiterite precipitation. The higher oxygen fugacity decreased significantly. It is believed that the interaction between alkalinity and oxygen fugacity leads to mineralization.
【作者單位】: 中國地質(zhì)大學(xué)(北京)地球科學(xué)與資源學(xué)院;甘肅鼎豐礦業(yè)有限責(zé)任公司;加拿大拉瓦爾大學(xué)地質(zhì)與地質(zhì)工程系;
【基金】:國家自然科學(xué)基金項(xiàng)目(41072070)
【分類號】:P588.121;P611
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