湖南金船塘矿区矽卡岩矿物及Sn元素在绿帘石中的分布特征

Distribution of Skarn Minerals and Sn in the Epidote in Jinchuantang Mining Area,Hunan

金船塘矿区位于千里山花岗岩岩体西侧,与东侧柿竹园矿区均是湖南柿竹园特大型W-Sn-Mo-Bi矿床目前正在开采的重要矿区.该矿区块状矽卡岩的矿物特点是:石榴子石以钙铝石榴子石为主,辉石存在透辉石-钙铁辉石连续系列,长石以钙长石大量产出为特点,硅灰石出现了不常见的锰铁硅灰石;绿帘石中普遍含Sn,SnO2含量0.2%～2%.根据绿帘石中Sn元素的详细测定和计算,查明Sn元素在绿帘石中含量与在矿物中位置具幂律函数关系,计算的分形维为1.93,从矿物微观的尺度确认Sn等成矿元素在运移和分布上具分形时-空结构,从而证实自组织的临界状态是柿竹园特大型多金属矿床动力学的基本特点.

Jinchuantang is an important mining area in operation in the super large W-Sn-Mo-Bi deposit of Shizhuyuan, Hunan Province. The mineral characteristics of the massive skarn of the area are.. the garnet is mainly of anorthite; the pyroxene exists as continuous series of dipside-salite-ferrosolite-hedenbergite; the feldspar is mainly of anorthite; the wollastonite is found as a type of a rare mineral-（Mn,Fe）-wollastonite; the sphene is widely-spread as a skarn mineral, and its content of aluminum oxide is relatively high （maximum content being 8.32%wt）, and the Sn content of some sphene minerals is also relatively high; Sn is also widely spread in the mineral epidote, and the content of SnOz is 0.2 %- 2%. According to the distribution and the content of SnOz in the mineral epidote, it is found that, the content has the power function with its location, and the calculated fractional-dimension from the distribution of tin oxide is 1.93. From the mineral micro-scale, the transportation and distribution of ore element tin possess the fractional dimension time-location structure, and it is confirmed that the self-constructing critical situation is the basic dynamical characteristic of the super large multi-metal deposit of Shizhuyuan.