长江中下游铜金成矿岩体稀土地球化学特征

来源期刊：中南大学学报(自然科学版)1994年第4期

论文作者：张术根 王大伟

文章页码：436 - 440

关键词：岩浆作用; 稀土元素; 地球化学; 铜金成矿岩体; 长江中下游

Key words：magmatism; rare earth elements; geochemistry; Cu－Au mineralizing intrusiverocks; middle－lower Yangtze River reaches

摘    要：长江中下游铜金成矿岩体的岩浆作用机理研究对于岩体含矿性评价和铜金找矿具有重要意义.代表性岩体的稀土地球化学研究表明本区铜金成矿岩体是壳幔混合型岩浆岩,其岩浆作用过程是导源于地幔的岩浆与导源于地壳的岩浆沿超壳断裂混合上侵,金主要富集于幔源岩浆,铜主要富集于壳源岩浆,由于铜金成矿岩体都是壳幔混合型岩浆岩,故铜金矿化总是形影相随;又因为它们的壳幔物质比例各异,故铜金矿化又适度分离.

Abstract: It is of great significance to understand the mechanism of magmatism of the Cu－Au min-eralizing intrusive rocks along the middle-lower Yangtze River reaches for the assessment ofthe intrusive rock＇s mineralizing ability and prospection of the Cu－Au deposits. The researchof the REE＇s geochemistry of the representative intrusive rocks suggests that the Cu-Aumineralizing intrusive rocks are the MC type＇rocks;the lithospheric mantle－originated mag-ma mixes with the deep crust-originated magma along the deep faults;gold enriches in thelithospheric mantle-originated magma and copper enriches in the deep crust-originated mag-ma. Cu and Au are always associated closely in deposits,for all of the Cu-Au mineralizing intrusive rocks are MC type＇s,but Au content can be rather different in different deposits fortbe proportation of the lithospheric mantle-originated magma and the deep crust-originatedmagma is variable in the MC type＇s rocks.