内蒙古太仆寺旗白石头洼钨矿外围成矿花岗岩体特征及成矿作用.doc

内蒙古太仆寺旗白石头洼钨矿外围成矿花岗岩体特征及成矿作用 【中文摘要】近年来,华北陆块北缘太仆寺旗钨、钼、金多金属矿床普查找矿取得了重大进展,先后发现了沙子沟、白石门洼等大-中型矿床,显示了巨大的找矿潜力,而位于同一矿田内的白石头洼钨矿其探明储量已尽枯竭。因此,系统地研究本区的成矿地质背景,查明矿床定位的地质条件,分析控岩控矿因素,总结成矿规律,在白石头洼钨矿外围的找矿远景做出系统的评价,猜测找矿靶区,寻找接替资源就成了重要的研究内容。本文基于“白石头洼钨矿外围1/1万的地质填图与成矿猜测”项目,运用岩石学、构造地质学、矿物学、矿床学、地球化学、成矿猜测学、勘查学等多学科知识,综合以为本区颇具找矿潜力。首先,以区域地质特征为突破口,综合分析了本区的区域演化应力场,以为本区现在的构造格式主要受西伯利亚板块向华北地块的滑动近南北向应力与太平洋板块向欧亚板块俯冲的近东西向应力影响,其大地构造位置处于兴蒙褶皱带,此大地构造位置影响了本区的岩石地球化学、构造地球化学及成矿学特征。然后分析了本矿区的地质特征,包括地层、构造和岩浆岩,并着重对本区的花岗岩地球化学特征进行了深进的剖析,以为本区花岗岩钨等元素的背景值高、分异程度好,为本区矿化的主要成矿母岩。最后,在深进研究矿区地质特征的基础上,阐明了本区的控矿因素、找矿标志和矿化富集规律,并深进探讨了本区钨矿床成因,绘出成矿模式图,从而指出了本区的找矿方向及进行成矿猜测。; 【Abstract】 Recent years, many large-medium scale poly-metal deposits were found in the north margin of North China Craton, such as Shazigou molybdenum poly-metal deposit, Baishimenwa gold poly-metal deposit and so on. And in the same metallogenic zone, through more than 20 years mining, the resources in Bai***ouwa tungsten mineral deposit were nearly exhaustion. So it is very importance to study on the ore-controlling factors, regional metallogenic background and prospecting potentiality in this area.Based on the project of 110000 geological mapping and metallogenic prediction, conbined the multi-knowledge such as petrology, tectonics, mineralogy, economy geology, geochemistry, metallogenic prediction geology, mineral prospecting, the conclusion has been induced that there has been great prospecting potentiality in the area.Firstly, the regional geological characteristics is arranged for the breakthroughs and the stress field of regional evolvement has been analyzed, it is implied that the tectonic pattern today is mainly affected by the double stress of Siberia Plate slided toward North China Croton and Pacific Plate dived toward Eurasian Plate. So the geotectonic location in the area belongs to Xingmeng fold belt, and it determined the characteristics of litho-geochemistry, tectonic geochemistry and metallogeny.Secondly, the author discussed the regional geological characteristics, concluding strata, structure and magmatite, and emphasized on the granite geochemical feature, which was abundant of tungsten, gold, zinc and lead element and had high differentiation index, the granite is the host rock of the tungsten mineralization.Lastly, based on deeply analyzing the regional geological characteristics, the ore-controlling factors and mineral enrichment regularity have been found out. Meanwhile, the mineral deposit genesis and metallogenic model have been explained, and then the prospecting direction has been pointed out.