蟒西地区中酸性岩体地质特征及找矿潜力

通过对陕西蟒西地区中酸性岩体地质、地层、岩体构造等进行论述,归纳总结了区域中酸性岩体的特征,并通过矿床分析得出,陕西秦岭东部地区钼矿床地质学基本特征与中国内陆地区的大部分钼矿床的地质特征大致相同,其中Eu含量有所异常,K、Ra、Ba、Nb、Ta等元素的含量较为丰富,Ti为亏损状态;造山环境下易形成矿与岩;秦岭北部地区含矿岩浆中含有更多的壳液物质,南秦岭北部钼矿床含矿岩浆中含有较多的幔源物质。秦岭南部的大型岩体中原位Hf同位素特征值较高(-6.0～5.0,通常为负数),但是亏损地幔二阶段年龄的值较低(1.47～0.79 Ga),相关数据结果表明岩浆的来源为幔源物质与新生的加厚地壳。可见,地质和地球化学特征指示,秦岭地区有形成钼矿床的有利条件,形成小-中型铜、钼矿床的潜力大。

Study on Geological Characteristics and Prospecting Potential of Intermediate-acid Rock Mass

Through discussing the geology, strata and rock structure of intermediate-acid rock mass in Shaanxi area, the characteristics of regional acid rock mass are summarized. Through the analysis of ore deposits, it is concluded that the basic geological characteristics of molybdenum deposits in eastern Qinling area of Shaanxi Province are similar to those of large-distributed molybdenum deposits in China"s mainland, in which Eu is contained. The content of K, Ra, Ba, Nb and Ta is abundant and Ti is deficient. Ore and rock are easily formed in orogenic environment. The ore-bearing magma in the northern Qinling Mountains contains more crustal fluid, and the manganese-derived magma in the molybdenum deposits in the northern South Qinling Mountains is abundant. The value of in the large-scale rocks in southern Qinling Mountains is higher (-6.0-5.0, usually negative), but the value is lower (1.47-0.79Ga). Relevant data indicate that the magma originated from mantle-derived materials and the newly formed thickened crust. Geological and geochemical characteristics indicate that the Qinling gas has beautiful conditions for forming molybdenum deposits, and has great potential for forming small to medium-sized copper and molybdenum deposits.