论文部分内容阅读
铜陵东狮子山铜矿为一夕卡岩矿床，但与常见的夕卡岩矿床明显不同。在产状方面，夕卡岩与围岩（大理岩）界线截然，围岩出现重结晶褪色边，夕卡岩边缘有淬火边，与夕卡岩相接触的辉石二长闪长岩出现烘烤褪色边，夕卡岩中出现辉石二长闪长岩角砾；在矿物组成上，具特殊的钾长石＋方解石＋石英囊状体，其内矿物边界规则，无分带现象，夕卡岩矿物无被交代现象；在结构构造方面出现特征的海绵陨铁结构、豆状构造、流动构造等；在地球化学方面，夕卡岩岩石的微量元素、稀土元素特征与辉石二长闪长岩相似，其中呈填隙状方解石的化学组成、同位素组成显示深源特征；夕卡岩矿物中出现熔融包裹体，均一温度高于９２０℃；矿体特征与寄主夕卡岩的各方面特征十分相似。这些特征显示该矿床可能是一种高温高密度粘稠的夕卡岩岩浆熔（流）体冷凝结晶演化过程的产物。
The Tongling East Lion Rock copper deposit is a skarn deposit, but obviously different from the common skarn deposit. On the aspect of occurrence, the boundary between skarn and surrounding rock (marble) is quite clear, the surrounding rock appears recrystallization and fading edge, the edge of skarn is quenched, and the pyroxene diorite in contact with skarn appears Baking fade side, skarn appear pyroxene dickite breccia; in the mineral composition, with a special potassium feldspar + calcite + quartz capsule, the mineral boundary rules, no zoning, Sika Rock minerals have not been metamorphosed; sponge meteorite structure, bean-shaped structure, flow tectonics and so on which have structural features; in terms of geochemistry, trace elements, rare earth elements and pyroxene diorite The rocks are similar in shape, with the chemical composition and the isotopic composition of the calcite calcite showing deep-source characteristics. The melt inclusions occur in skarn minerals and the homogenization temperature is higher than 920 ° C. The characteristics of ore bodies and the host skarn are very different similar. These features indicate that the deposit may be the product of a condensation and crystallization process of a high-temperature, high-density, viscous, skarn magmatic melt stream.