北祁连成矿带地球化学块体含矿性评价

ORE-BEARING POTENTIALS OF GEOCHEMICAL BLOCKS IN THE NORTH QILIAN METALLOGENIC BELT

北祁连是我国重要的成矿带之一,其主要构造单元由微陆块、混杂岩带、蛇绿岩、洋脊—洋岛火山岩、岛弧火山岩及岛弧型沉积岩组成。该成矿带的成矿元素Au、Cu、Fe、Mn、As、Sb、Ba、Cr、N i、Co、V具有强富集特征。文章运用“地球化学块体”理论和方法,对北祁连区域地球化学块体的分布及其与矿产资源潜力的关系进行了深入的剖析,利用块体分级建立块体内部结构系列,形成套合的地球化学模式,追索成矿元素逐步浓集的过程,讨论了Au、Cu、Cr、N i、W、Sb等地球化学块体特征,结合区域地质背景对该成矿带不同建造发育的地球化学块体含矿性进行了评价。

The north Qilian area is one of important metallogenic belt of China, and it is composed of microcontinent, ophiolite, mélange belt, ocean ridge and ocean island volcanic rocks, island arc volcanic rocks and island arc sediment rocks. The ore -forming elements of Au, Cu, Fe, Mn, As, Sb, Ba, Cr, Ni, Co and V are strong enriched in the metallogenic belt. The geochemical block theory and method have been applied to research the distribution characteristics and metal resources potential. Utilizing classification of blocks, internal structure and serials of blocks are established to form relevant geochemical model, in order to search for processes of gradual enrichment of mineralizing elements. By using the geochemical block and regional geological background, ore - forming potentiality of the main metallogenic dements of Au, Cu, Cr, Ni, W and Sb is analyzed. Ore - bearing potentials of different ~eochemical bleoks in the north Qilian ogogen are evaluated.