中条山铜矿峪斑岩铜矿金属硫化物的铼-锇同位素年龄及地质意义

Re- Os同位素测年法是测定金属矿床成矿年龄较直接、有效的方法。作者对中条山铜矿峪斑岩铜矿中的含辉钼矿硫化物采用 ICP- MS同位素稀释法进行 Re- Os同位素年龄测定。首次获得 2个 Re- Os同位素等时线年龄 ,其值分别为 (2 94 7± 2 8)× 10 6a与 (2 10 8± 32 )× 10 6a。这些年龄数据有力地说明铜矿峪斑岩铜矿的形成不是一个单一的成矿过程 ,而是一个多期的复合成矿过程。它为确定铜矿峪斑岩铜矿的成矿年龄及建立该矿床的成矿演化模式奠定了重要基础

Rhenium-Osmium isotoric ages of sulfides from the Tongkuangyu porphyry copper deposit in the Zhongtiao Mountain

As an effective geochronometric technique the thenium-osmium method is well suited to determine the formation ages of some sulfide minerals in ore deposits. The thenium-osmium isotopic ages of molybdenite-bearing sulfides from the Tongkuangyu porphyry copper deposit in the Zhongtiao Mountain were determined with inductively coupled plasma-source mass spectrometry (IDI-ICPMS). The two Re-Os isochronic ages, (2947+ 28)×l0⁶ a and ( 2108+32)×l0⁶ a, were obtained for the first time in the Tongkuangyu porphyry copper deposit.The data based on different isochronic ages suggest that the formation of the Tongkuangyu porphyry copper deposit underwent a complex ore-forming process. The Re-Os is otopic study is of great importance in the determination of ore-forming ages and the establishment of an ore-forming model.