治嶺頭金礦圍巖蝕變特征及其意義
[Abstract]:Located in Suichang County, Zhejiang Province, Zhilingtou Gold Deposit is a large gold deposit along the southeast coast of China. The wall rock of the deposit is altered and developed, with silicification, sericite, chlorite, pyrite, calcite and rhodochromatic mineralization. From the orebody to the surrounding rock, there are four alteration zones: strong silicification zone, weakly silicified-yellow sericite zone, sericite zone and green-mud petrochemical zone. Along the direction of orebody, the alteration strength fluctuates as a whole, which is consistent with the lenticular characteristics of orebody. Silicification, pyrite mineralization, rhodochromatic mineralization are most closely related to gold mineralization, and these alterations have a similar trend. The trends of sericite and green mud fossilization and silicification are different, and they are not closely related to mineralization. In addition, calcite is also developed in the mining area, and its strength is weak. Gold mineralization and wall rock alteration developed in metamorphic rocks of the Paleoproterozoic Badu Group, and did not enter the overlying Mesozoic volcanic rock caprock, indicating that the mineralization of the Zhilingtou gold deposit is not related to Mesozoic volcanic activity. The results of quantitative calculation show that Al_2O_3,TiO_2,P_2O_5 is an inert component in the process of alteration, such as Sio _ 2CaO _ 2O _ (2CaO) MNO _ (2) O _ (+) _ (+) Cu _ (+) Pb _ (+) Zn, and so on. The obvious component is Fe _ 2O _ 3C _ 2O _ 3FeO _ O _ 2O _ K _ 2O _ K _ 2O _ K _ 2O _ K _ 2O _ K _ 2O _ O _ O _ O _ n, etc. Based on the alteration of the surrounding rock and the analysis of stable isotopes, it is inferred that the original ore-forming hydrothermal fluid of Zhilingtou gold deposit should be a magmatic hydrothermal fluid rich in Si,Ca,Mn,Au,Ag,Cu,Pb,Zn and other components, with the addition of atmospheric precipitation in the later stage.
【作者單位】: 吉林大學(xué)地球探測科學(xué)與技術(shù)學(xué)院;國土資源部地球化學(xué)探測技術(shù)重點實驗室;中國地質(zhì)科學(xué)院地球物理地球化學(xué)勘查研究所;
【基金】:中國地質(zhì)調(diào)查局項目(20089941) 中央級公益性科研院所基本科研業(yè)務(wù)費專項(AS2016P02)~~
【分類號】:P618.51
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