华北地台北缘东段金矿带硫同位素特征及其找矿意义

华北地台北缘东段金矿带主要类型金矿床的矿石硫同位素组成受矿源层破同位素背景值制约,成矿与不同时代花岗岩侵入或混合岩化作用引起的成矿物质活化作用有关。深成作用过程中的硫同位素平衡分馏效应使矿石硫稍富S~(34)。热变质过程中的硫同位素扩散分馏效应使矿石流稍富S~(32)。该区太古代层状岩系为金的潜在矿源,具有发现新矿化集中区和新类型金矿床的巨大潜力。根据金矿床硫同位素变化规律可进行深部成矿预测。

SULFUR ISOTOPIC CHARACTERISTICS OF THE GOLD MINE ZONE IN THE EASTERN SECTION OF THE NORTHERN MARGIN OF THE NORTH CHINA PLATFORM AND ITS SIGNIFICANCE IN SEARCHING FOR ORE DEPOSITS

Ore-sulfur isotopic compositions of major types of gold deposits in the eastern section of the northern margin of the North China Platform is controlled by the sulfur isotopic background value of gold source beds. Metallogenesis was related with the mobilization of metallogenic materials in gold source beds. Multiple intrusion of granitoid or migmatization are responsible for such mobilization. So these gold deposits can be called the stratabound gold deposits related with granitoid. The sulfur isotopic equilibrium fractionation effect makes metallogenic fluid concentrate S34 in the hypogeaic mobilization. The sulfur isotope diffusion fraction effect makes metallogenic fluid concentrate S32 in the thermo-metamorphism.The Archeozoic bedded formation is the potential auriferous source in this area.There is a bright future in discovery of new concentrated zones and new-type gold deposits.The study of sulfur isotopic distribution in gold deposits should be helpful to prospecting for blind orebodies.