| 关于“碱质交代成矿模式”的几点看法 |
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| 引用本文：.1989.Some opinions about metallogenic model of alkaline metasomatlsm[J].Mineral Deposits,8(3):90~96 |
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| Some opinions about metallogenic model of alkaline metasomatlsm |
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| Abstract:Taking Xihuashan in Jiangxi province as all example, the author advances his opinions on the “metallogenic model of alkaline metasomatism related to granites” put forward by professor Hu Shouxi et al. The geological observations and petrological mineralogical and geochemical studies have revealed the following facts: 1) The lower parts and roots of the ore veins and the related red-feldspathization are almost all confined to medium fine grained granite(γ52b), which is a product of albitization in closed and planar forms. The redfeldspathization alongside the ore veins occurs in open and linear forms and Was formed later than the albitized granite(γ52b). 2) Beneath the red-feldspathjzation zone i. e., towards the greater depth of the granite body, there is a white-albitization zone formed later than red-feldspathization. 3) The formation of ore veins ia the medimn-fine grained granite mainly proceeded downward, so the intense red-feldspathization at the root of the ore veins occurred latest and marked the end of the mineralization. 4) The red-feldspathized rock is usually in compalty with greisens. The Red-feldspathized rock in the greisen zone contains relatively high tungsten, whereas greisen in red-feldspathizatioIl zone only has rather weak mineralization. The red-feldspathized rock and greisen are two different parts separated contemporaneously from residual melt-fluids. 5) Tungsten is unevenly distributed in the Xihuashan granite body, and the lower and upper parts of the rock body show considerable difference I nits contents: from only 4.8 ppm at the depth to some 50 ppm (sporadically in excess of 100 ppm)in the upper part. Based on these facts, the author consider that the metallogenic model of alkalino metasomatism seems not to hold water in Xihuashan area. |
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