摘要：
东秦岭洛南—豫西地区包含陕西华县金堆城和河南栾川南泥湖两个超大型钼矿田.两个矿田的几乎所有钼矿床均为斑岩型钼矿床,南泥湖矿田内矿床的一部分属于矽卡岩型钨钼矿床,但仍然属于广义上的斑岩型钼矿床.这些超大型、大型钼矿床的成矿母岩都是小岩体.确切地说,这些小岩体均是属于高硅、高钾、高碱低钙镁的"三高一低"的强酸性钙碱性的超浅成侵入岩—花岗斑岩岩株.它们的演化过程离不开区域巨大型的花岗岩基,花岗岩基是花岗斑岩岩株演化的物质基础.一般地,成矿岩体的SiO2含量下限为72.5%,上限为76%左右;K2O含量5%~6%,K2O+Na2O界于8%~9%之间,K2O/Na2O为1~2,超大型、大型钼矿床成矿母岩K2O/Na2O为2~3.里特曼指数σ限制在1.8~2.6对成矿有利.SiO2/K2O限制在11~16之间.我们说只有强酸性小岩体才能构成钼矿床的成矿母岩,这就是岩浆岩尤其是花岗岩成矿专属性的具体体现,也是小岩体成大矿的找矿地质成果的实践结论.%The area of Luonan-west of Henan province includes two super large molybdenum deposits,Jinduicheng in Shaanxi province and Nannihu in Henan province.Almost all molybdenum deposits in the mine are porphyry mo-lybdenum deposits.Some of the deposits in Nannihu mine belong to the silicon-type tungsten molybdenum deposit, but still belong to the porphyry molybdenum deposit in the broad sense.The metallogenic rocks of these large molyb-denum deposits are small rock masses.These little rocks are, to be exact, the ultra-shallow and intrusive rocks of high-silicon,high-potassium,high-alkali,low-calcium magnesium,and the granite porphyry.The evolution process cannot be separated from the large granite base of the region,and the granite base is the material basis of the evolu-tion of granite rock.In general, the lower limit of SiO2in the ore body is 72.5%, and the upper limit is about 76%.K2O content is 5%~6%,K2O+Na2O is between 8%and 9%,K2O/Na2O is 1~2,and super large and large molybdenum deposit is 2~3.The Reitman index σis limited to 1.8~2.6 in favor of ore.SiO2/K2O is limit-ed to 11~16.We say that only small strongly acidic rock mass can constitute a molybdenum deposit ore-forming parent rock,which is the embodiment of magmatic rocks,especially granite mineralization specificity,is also a lit-tle rock into the big ore prospecting geological results of practical conclusion.
