中国东部中生代钼矿成岩-成矿时差  

A Study of the Time Gap between Diagenesis-Mineralization of Mesozoic Molybdenum Deposits in East China

作　　者：杜保峰[1,2] 李艳军[1] 燕长海[2] 陈冲[1] 罗雪[2] 王明志 张戈红[2] 

机构地区：[1]中国地质大学资源学院,武汉430074 [2]河南省地质调查院,郑州450007 [3]陕西省地质调查院,西安710065

出　　处：《矿物岩石地球化学通报》2012年第2期165-176,共12页Bulletin of Mineralogy, Petrology and Geochemistry

基　　金：教育部创新团队发展计划项目(IRT0755);中国地质大学地质过程与矿产资源国家重点实验室基金资助项目

摘　　要：与岩浆成因相关的钼矿床成岩-成矿时差是确定矿床与岩浆岩成因关系的重要基础。本文根据收集的中国东部中生代典型钼矿床的成矿及相关岩体的同位素测年数据,详细讨论并定量厘定了钼矿的成岩-成矿时差分布特征。结果表明,钼矿成矿同步或略滞后于同源岩浆活动,中国东部整个钼矿成矿高峰的两个阶段时差介于0～10.0Ma和0～15.0Ma;对于单个钼矿床,其成岩-成矿时差集中在0～14.0Ma,均值为3.9Ma;从斑岩型钼矿床→斑岩-矽卡岩型钼矿床→矽卡岩型钼矿床→石英脉型钼矿床,成岩-成矿时差呈逐渐增加趋势,这与岩浆热液成矿过程的地质事实吻合。The time gap of diagenesis-mineralization,a hotspot in Mo deposits study,is an important basis to confirm the genetic relationship between Mo deposits and their cognatemagmatites.According to isotopic dating of mineralization and associated rock of some typical Mesozoic Mo deposits in East China,we detailly discusse and quantitatively determinate the time gap of diagenesis-mineralization for Mo deposits.Mo mineralization occurred synchronously or slightly behind the comagmatic activity.Two peak stages of diagenesis-mineralization time gap of Mo mineralization are within the scope of 0-10.0 Ma and 0-15.0 Ma;For a single Mo deposit,the time gap concentrated in 0-14.0Ma with a mean of 3.9 Ma.From the porphyry-type Mo deposits to porphyry-skarn complex Mo deposits to skarn-type Mo deposits and to quartz vein-type Mo deposits,the time gap of diagenesis and mineralization increases graduallywhich is consistent with the objective geological facts of the magmatic hydrothermal ore-forming process.

关 键 词：钼矿 成岩-成矿时差 中国东部 中生代 

分 类 号：P618.65[天文地球—矿床学]