蟒西地区中酸性岩体地质特征及找矿潜力  

Geological Characteristics and Prospecting Potential of Intermediate Acid Rock Mass in Mangxi Area

作　　者：李菲 LI Fei(Shaanxi Geological Science and Technology Center,Xi an 710065,China)

机构地区：[1]陕西省地质科技中心,西安710065

出　　处：《科学技术与工程》2020年第18期7176-7182,共7页Science Technology and Engineering

基　　金：陕西省地质勘查基金项目(61201304172)。

摘　　要：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。By reviewing the geology of intermediate-acid rock mass, strata, and rock structure in Mangxi area, Shaanxi, the characteristics of regional acid rock mass were summarized. Based on the analysis of ore deposits, it is concluded that the basic geological characteristics of molybdenum deposits in the eastern Qinling area of Shaanxi Province are similar to those of most molybdenum deposits in the mainland of China, in which Eu anomaly is contained, and the contents of K, Ra, Ba, Nb, and Ta are abundant while Ti is deficient. Ore and rock can be originated easily 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 characteristic value of Situ Hf isotope in the large-scale rocks in the southern Qinling Mountains is higher(-6.0~5.0, usually negative), but the second-stage age of depleted mantle is lower(1.47~0.79 Ga). Relevant data indicate that the magma is originated from mantle-derived materials and new thickened crust is formed. Therefore, geological and geochemical characteristics indicate that the Qinling region has conditions favorite for forming molybdenum deposits, and has great potential for forming small to medium-sized copper and molybdenum deposits.

关 键 词：中酸性岩体 地质特征 找矿潜力 遥感技术 地质成因 

分 类 号：P618.67[天文地球—矿床学]