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哈达门沟金矿床位于华北地台北缘西段,产于新太古代乌拉山岩群变质岩系中。矿床以发育一系列含金钾长石-石英脉为特征,这些钾长石-石英脉沿近东西向的韧、脆性叠加断裂成群产出。钾长石化是最发育的近矿围岩蚀变。采用离子探针(SHRIMP)对矿体边部的钾长石化蚀变岩锆石U-Pb 定年结果表明:矿化钾长石化蚀变岩的年龄为132±2 Ma。由于钾长石化蚀变岩本身被金矿化,因此金矿化年龄小于或接近于132±2 Ma,应为燕山晚期成矿。
The Hadamengou gold deposit is located in the western segment of North margin of North China Platform and is produced in the metamorphic rocks of the Neo-Archean Wulashan Group. The deposit is characterized by the development of a series of gold-bearing feldspar-quartz veins, which are produced in groups of ductile and brittle superimposed faults along the east-west direction. Potash feldspar is the most developed near-ore rock alteration. The results of U-Pb zircon dating from K-feldspar alterational rocks at the edge of the ore body using ion probe (SHRIMP) show that the age of mineralized K-feldspar alteration rock is 132 ± 2 Ma. Since the K-feldspar alteration rocks themselves are gold mineralized, the gold mineralization age is less than or close to 132 ± 2 Ma and should be the late Yanshanian mineralization.