同源岩浆成因金矿成岩成矿时差的统计研究  

STHZStatistic Study of Diagenesis—Mineralization Time Gap for Comagmatic Gold Deposits

作　　者：谭俊[1] 魏俊浩[1] 谭文娟[1] 郭大招[1] 

机构地区：[1]中国地质大学资源学院,武汉430074

出　　处：《地质论评》2006年第1期54-62,共9页Geological Review

基　　金：教育部博士点基金资助项目(编号20040491502)的成果

摘　　要：同源岩浆成因金矿的成岩成矿时差是确定矿床与岩浆岩成因关系的重要基础。而中国同源岩浆成因金矿分布十分广泛，前人在成矿学和岩石学方面做了大量的研究，为此本文收集了国内一些典型金矿的成矿和相关同源岩浆岩的同位素测年数据，讨论并定量厘定了该类金矿床成岩成矿时差的分布特征及分布范围。数据统计分析及柯尔莫哥洛夫准则检验结果显示，成矿事件一般同步或略滞后于同源岩浆活动，成岩成矿时差在95％信度下服从正态分布，介于0～16．0Ma，均值约为7．0Ma。因此，若金矿成岩成矿存在着≤16．0Ma的时差，就应该重视二者之间的同源成因联系。同时，笔者也强调：准确的成岩成矿时差应加强对金矿成岩成矿地质背景的研究；重视时差研究与微量元素和同位素示踪相结合，从年代学和地球化学方面对矿床成因作出合理的解释。The diagenesis-mineralization time gap as one hotspot in gold deposit study is one important basis to confirm the genetic relationship between gold deposits and their cognate magmatites. Moreover, these gold deposits distribute broadly in China and the metallogeny and petrology for them are in the greatest details. In this paper, the authors collected published isotopic ages of some typical gold deposits and related intrusions to discuss the time gap distribution characteristic and range. According to data statistic and Kolmogorov rule test, the mineralizing events are coeval with or postdate comagmatic intrusions. The time gap obeys to normal distribution under 0. 05 confidence level and cluster between 0 and 16.0 Ma averaging at about 7.0 Ma. Thus, if the time gap is ≤16. 0 Ma, we should recognize the cognate relationship between the deposit and the intrusion. The authors also emphasize that for the exact diagenesis-mineralization time gap one should strengthen the study of geological setting of gold mineralization, pay attention to the combination between the time gap and trace elements and isotopic trace study, and explain the deposit genesis on the basis of both chronology and geochemistry.

关 键 词：同源岩浆成因金矿 成岩成矿时差 统计分析 

分 类 号：P618.51[天文地球—矿床学]