土岭—石湖金矿床中黄铁矿的成分特征及其成因意义

Chemical Composition of Pyrite from the Tuling-Shihu Gold District and Its Genetic Significance

河北省灵寿县土岭-石湖金矿床产于燕山期花岗闪长岩体与太古宙阜平群变质岩系的外接触带中。金矿床中黄铁矿的硫同位素显示金的成矿热液与花岗闪长岩岩浆同源。黄铁矿的主成分具有亏硫特征,属典型的内生型。从矿脉到蚀变岩及受蚀变围岩,黄铁矿的Au、Ag、As含量及Au/Ag比值降低,Co、Ni、Se含量及Co/Ni此值、S/Se比值升高。这些元素的含量及有关参数对金及黄铁矿的取样位置具有良好的指示意义,是确定矿体位置及其含金性的标志,也是成矿温度的函数。

Located in Lingshou County, Hebei Province, the Tuling-Shihu gold dis-trict lies at the exocontact zone between the Yanshanian granodiorite and me-tamorphic rocks of the Archean Fuping Group. Sulfur isotope composition ofpyrite from gold veins suggests that the ore-forming. solation of gold was con-sanguineous with the granodiorite magma. Pyrite in gold veins is depletedin sulfur. From gold ore veins to altered wall rocks, Co, Ni, Se, Co/Ni and S/Seof pyrite increase whereas An, Ag, As, and Au/Ag decrease. The contents of the-se elements in pyrite and related parameters are good indicators for grold gra-des of ore veins and sampling locations of pyrite and also functions of ore-forming temperatures.