江西金溪熊家山钼矿床微量元素地球化学特征及成矿机理 The Trace Elements Geochemical Characteristics and Formation Mechanism of Xiongjiashan Molybdenum Deposit, Jinxi, Jiangxi Province
江西金溪熊家山钼矿主要以辉钼矿的形式富集于地层和岩体的破碎及裂隙等空间处，形成了沿着构造方向上展布的脉状、网脉状辉钼矿矿体，初步认为其为岩浆期后热液石英脉型矿床。研究显示该地区同时代的岩浆岩具有相同的来源，加里东期的构造环境与燕山晚期的构造环境具有一定相似性，其可能是该区构造演化的反复性的原因。稀土微量元素特征显示出源岩浆是由下地壳物质部分熔融与上地幔熔融体相互混合而形成的，显示其结晶分异演化过程的相似性，以及形成时的相同的陆–陆同碰撞构造环境，而且铕异常程度的不相同，反应其壳幔混溶的程度不同。其复杂构造环境，利于成矿，成矿是多期次，不同岩脉和与之相对应的多期次的岩浆活动，携带成矿元素：Cu、Mo等和矿化剂S，经岩浆演化形成的流体而成岩成矿。 The Xiongjiashan Molybdenum deposit are mainly in the form of molybdenite, which enriched in the rock strata and space of the broken and fractured, and formed molybdenite ore body along the direction of trending vein and stockwork. Preliminary studies suggest that it was the magmatic hydrothermal quartz vein-type deposits. And the con- temporary magmatic rocks have the same source in the region, what’s more, the tectonic environments of caledonian tectonic and Yanshan tectonic was certainly similar, anything else the tectonic evolution of this area may also be a manifestation of repetitive. Trace element characteristics of wich show that the magmatic rocks are from the partial melt mixture of lower crust and upper mantle, such as the crust-mantle mixing. And also it was under the continent-continent collision tectonic environment. And the contents of Eu anomaly that is not the same degree, which corresponding to different levels of the miscibility of the crust-mantle. Extremely favorable environment and complex structures, which was in favor of forming the Molybdenum deposit by the fluid from the formation of rock. The mineralization fluid is closely related with the multi-stage veins that corresponding to the magmatic activity, which carrying ore-forming ele- ments as Cu, Mo and the mineralizer elements of S and so on, lately magmatic evolution ended and the Xiongjiashan Molybdenum deposit formed.