遵化北部金矿区同位素地球化学研究

ISOTOPE GEOCHEMISTRY REASEARCH ON Au-MINES IN THE NORTH OF ZUNHUA, HEBEI PROVINCE

对采自遵化北部茅山金矿、田家村金矿区的黄铁矿及围岩分别进行了铅、硫同位素分析，按三阶段演化模式得出ｔ_１＝３．３Ｇａ，相当于太古代变质岩成岩年龄，ｔ_２＝１．４Ｇａ相当于冀东地区第二次变质作用和钾质花岗岩侵入年龄，ｔ３＝０．１６Ｇａ，相当于燕山花岗岩的侵入年龄。结合部分钾－氩年龄数据可以大致推断本区金矿经历了三次成矿作用。且成矿物质来源于太古界地层。

Samples collected from Maoshan and Tianjiacun Au-Mines are analysed for Pb and S isotopes of pyrite and those of the wallrocks. t1= 3. 3Ga corresponding to rock-forming age of Archean metamorphic rocks, t2=1. 4Ga to the second metamorphism in tne east Hebei Area and the intrusion of K-granite, t3= 0.16 Ga, to the intrusion of Yanshanian granites are obtained by three stage evolution model. Together with some K-Ar data it is infered that Au-ore in the area underwent three metallogenic events and ore materials could te derived from the Archean rocks.