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.
出处
《矿物岩石地球化学通报》
CAS
CSCD
北大核心
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
关键词
钼矿
成岩-成矿时差
中国东部
中生代
Mo deposits
time gap of diagenesis and mineralization
East China
Mesozoic
