平阳矾山明矾石矿床岩石学特征及其成因浅析

在野外地质工作的基础上，通过对浙江平阳研山明矾石矿床的岩石学及地球化学特征进行认真的研究，进一步证实了矾山明矾山矿床是酸性火山气热液与中酸性火山碎屑岩内的碱性长石的交代中形成的。为了解释矿床的均一性，成矿的周期性和矿床单向依变分带等重要特征，我们重点研究了矿床中明矾石化和叶蜡石化的热力学性质，得出了K 活度和pH值是控制交代产物的重要因素的新结论，提出了该矿床交代成矿作用的新模型，并据此成功地解释了矿床的一些重要特征。

THE PETROLOGICAL CHARACTERISTICS AND THE SUPERFICIAL VIEW ON THE CAUSE OF FORMATION OF THE ALUNITS DEPOSIT IN PINGYANG FANSHAN

On the basis of the field geological works, we have further proved that the alunite deposit in Pingyang Fanshan, Zhejiang formed in the metasomatism of the acid volcanic gas-hydrothermal solution with the alkali feldspar in the pyroclastic rock by detailed study of the petrlolgical and geochemical characteristics teristics of it. In order to reasonably explain the homogeneity of the deposit, the cyclicity of the mineralization and the uni-ilateral alteration-zoning of the deposit ect., we paid attention to the study on the thermedynamic properties of alunitization and pyrophyllization and reached a new conclustion that pH value and K activinty are important factors to control the products of the metasomatism. We put forward a new model of metasomatic mineralization and made use of it to successfully explain some important characteristics of the deposit.