同位成矿作用的概念、类型与机制

ISOSPATIAL METALLOGENESIS: CONCEPT, TYPES AND METALLOGENETIC MECHANISM

同位成矿作用系指在同一成矿空间内，循时间序列，伴随地质演化的进程，某种元素、元素组合的多期富集成矿、叠加和定位作用过程的总称。以铜多金属矿床为例，初步厘定了同位成矿作用的类型（异时单期同位成矿、异时多期同位成矿、同时多型同位成矿）、剖析了同位成矿作用的边界条件（丰富的成矿物质和成矿流体、稳定且长期活动的热中心及迁移通道、优化的成矿系统结构和局部适宜的沉积环境），并从理论上阐述了同位成矿作用与区域地幔成分的不均一性。

The isospatial metallogenesis is a special term concerning the processes of multi periodic mineralization, superposition and localization of an element or element association in the same metallogenetic domain and along the temporal sequence. Taking copper polymetallic deposits as example, the isospatial metallogenesis can be divided preliminarily into three types: (1) heterochronous monoperiodic isospatial metallogenesis; (2) heterochronous multiperiodic isospatial metallogenesis; (3) synchronous multitype isospatial metallogenesis. The boundary conditions of isospatial metallogenesis are: (1) abundant sources of ore forming material and ore forming fluids; (2) stable and long actively thermal center; (3) the structure connecting the ore forming material source and the active thermal center; (4) locally suitable deposition environment. The mechanism and relation of the isospatial metallogenesis to “mantle plume” were discussed either in the paper.