中国岩浆硫化物矿床的主要成矿机制  

THE MAIN MINERALIZATION MECHANISM OF MAGMA SULFIDE DEPOSITS IN CHINA

作　　者：汤中立 

机构地区：[1]甘肃省地质矿产局

出　　处：《地质学报》1996年第3期237-243,共7页Acta Geologica Sinica

摘　　要：深部熔离—贯入成矿机制,即指母岩浆侵入现存空间之前,在深部就发生了熔离作用和部分结晶作用,使母岩浆分离为不含矿岩浆、含矿岩浆、富矿岩浆、矿浆几部分,然后对现存空间一次或多次上侵贯入成矿。一般来说,经过深部熔离后的不含矿岩浆的体积,比含矿岩浆、富矿岩浆和矿浆的体积要大得多,在上侵过程中,不含矿岩浆大部分都侵入到不同的空间或喷溢出地表,形成岩群或岩流,剩余的岩浆、含矿岩浆、富矿岩浆和矿浆可以多次贯入同一空间成岩、成矿(金川),也可以分别贯入不同的空间成岩、成矿(红旗岭)。比照就地熔离的矿床,这种深部熔离—贯入矿床的岩体体积就小得多,含矿率和矿石品位也高得多,所以这种成矿作用导致形成小岩体,大矿床。The meaning of 'the deep-seated magmatic liquation-injection mineralization' is as follows. Before intruding, parent magma has undergone liquation and partial crystallization at depth, so that the parent magma is partitioned into barren magma, ore-bearing magma, ore-rich magma and ore pulp, which then ascend and inject into the present locations once or multiple times, thus forming deposits. The volume of the barren magma is generally much larger than those of the ore-bearing magma, ore-rich magma and ore pulp. In the ascending process, the barren magma mostly intrudes into different spaces or outpours onto the surface, forming rock bodies or rock flows. The rest barren magma, ore-bearing magma, ore-rich magma and ore pulp may multiple times inject into the same space where lithogenesis and mineralization take place (e. g. Jinchuan), or may separately inject into different spaces where lithogenesis and mineralization happen (e. g. Hongqiling). Compared with in-situ magmatic liquation deposits, deep-seated magmatic liquation-injection deposits have a much smaller volume, higher ore yield and higher ore grade. Consequently, this mineralizing process results in the formation of small rock masses and large deposits.

关 键 词：岩浆 硫化物矿床 成矿机制 

分 类 号：P611[天文地球—矿床学]