摘要
特大型矿床具有成矿偏在性并受控于异常成矿构造聚敛场。它们是常规成矿作用 (过程 )中发生“引潮共振”而爆发的异常成矿作用的产物 ,具有与中小型及大型矿床显著不同的成矿机制。异常成矿作用的发生与一定地质历史时期出现的全球性重大异常地质事件有关 ,如太古宙氧大气变态(过氧事件 )、元古宙还原大气变态 (缺氧事件 )和显生宙构造圈热侵蚀 (大规模构造岩浆事件 ) ,其结果导致在短时限内发生成矿物质的超巨量工业堆积。研究和探索异常成矿作用的“基因”
Exceptional large ore deposits are defined as those with both very big ore reserves and special ore-forming characteristics, and were formed under an explosive anomaly of mineralization in the normal state of ore-forming process. They have special selectivity toward special ore-forming commodities, deposit types, ore-forming ages and geological setting, which may be called metallogenic preferentiality. Exceptional metallotect convergence is the optimum ore-controlling site for exceptional large ore deposits. Regarding the genesis of anomalous ore-forming process, we hereby propose that they were created by global geological events in certain eons and eras in geological history, such as oxyatmversion (excess oxygen atmospheric event) in the Archean, redoxyatmversion (lack oxygen atmospheric event) in the Proterozoic-Paleozoic, and tectonosphere thermal erosion (great amount of tectonic magmatic event) in the Mesozoic-Cenozoic. It is a key problem for metallogeny to study and discover the gene of anomalous ore-forming process.
出处
《地学前缘》
EI
CAS
CSCD
2004年第2期323-331,共9页
Earth Science Frontiers
基金
世界地质图类委员会"世界大型超大型矿床成矿图--全球成矿研究"项目
中国地质调查局地质调查项目"中国成矿体系与区域成矿评价"
关键词
特大型矿床
成矿偏在性
异常成矿构造聚敛场
异常成矿作用
exceptional large ore deposits
metallogenic preferentiality
exceptional metallotect convergence
anomalous ore-forming process
metallogeny
metallogenic gene
