四川西部三江中段成矿带地质构造演化、成矿特征与成矿系列

以板块理论为指导,提出本区地质演化阶段四分方案,总结了各阶段相关矿产时空分布特征;阐明成矿地质条件的复杂性、成矿作用的多样性、矿床类型丰富性、成矿元素特征性和矿床规模趋大性等特点;在成矿时代上指出三叠纪、侏罗—白垩纪和古近纪—新近纪为主要成矿期;在成矿构造环境上,以岛弧、弧后盆地、重熔花岗岩带、走滑剪切带及其拉分盆地为有利成矿场所,并根据成矿系列的定义厘定了成矿系列。

Geologic- tectonic Evolution,Ore- forming Features and Minerogenetic Series of Deposits in the Middle Sector of the Nujiang- Lancang- Jinsha Rivers Metallogenic Belt

The present paper divides the geological evolution in this region into four stages and describes space-time distribution of mineral resources in various stages based on the theory of plate tectonics.The complexity of ore-forming conditions,diversity of ore-formation and deposit type,specific characteristics of ore-forming elements and large on a scale of ore deposits are pointed out.On metallogenic epoch,major metallogenic epoch were Triassic,Jurassic-Cretaceous and Lower Tertiary-Upper Tertiary.On metallogenic geological setting,major ore-formation occurred in island arc,back-arc basin,anatexis granite belt,strike-slip shear zone and pull-apart basin.The minerogenetic series of ore deposits in this region is regulated on the basis of the definition of minerogenetic series of ore deposits.