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花牛山矿产集中地区与钨、锡、钼、金、银、铅、锌等成矿关系密切的钾长花岗岩是印支期—燕山早期构造—岩浆活动产物。岩石化学和地球化学具A型花岗岩特征:SiO271.51%～77.53%,Al2O311.64%～14.41%,K2O+Na2O7.43%～9.75%,K2O/Na2O1.01～2.04,CaO0.36%～1.9%,MgO0.03%～0.77%,Eu、Ba、Sr贫,富集Nb、Td、Hf、Th、U等元素。结合区域地质和岩浆岩资料,作者认为,钾长花岗岩是同熔型岩浆经一系列分异演化的产物,形成的构造环境是二叠纪—三叠纪EW向裂谷作用和中生代滨西太平洋NE向断裂。北山地区与印支—燕山期“A”型有关的W、Sn、Mo、Au矿的找矿潜力巨大。“A”型花岗岩的区域构造—岩浆演化,对指导区域矿产预测和评价均具有重要的理论和实际意义。
The potash-bearing granite closely related to the mineralization of tungsten, tin, molybdenum, gold, silver, lead and zinc in the area of Husiushan mineral is the product of the Indosinian-Early Yanshanian tectono-magmatic activity. Rock chemistry and geochemistry with A-type granite characteristics: SiO271.51% ~ 77.53%, Al2O311.64% ~ 14.41%, K2O + Na2O7.43% ~ 9.75%, K2O / Na2O1.01 ~ 2.04, CaO0.36% 1.9%, MgO 0.03% -0.77%, Eu, Ba, Sr poor, enrich Nb, Td, Hf, Th, U and other elements. According to the regional geology and magmatic rock data, the authors believe that the potash-bearing granite is the product of a series of differentiation and evolution of the same-melt magma. The tectonic environment formed is Permian-Triassic EW-rifting and the Mesozoic western foreland Pacific NE fracture. The prospecting potential of W, Sn, Mo and Au related to Indosinian-Yanshanian “A” type in Beishan area is huge. The regional tectono-magmatic evolution of the “A” granite is of great theoretical and practical significance for predicting and evaluating mineral resources in the guiding area.