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碱性岩相关铜-金(钼)矿床的研究进展

         

摘要

Cu-Au (Mo) deposits related to alkaline rocks have attracted more and more attention throughout the world, because more than 20% of the world-class Au-Cu (Mo) deposits are associated with shoshonitic and alkaline rocks. Although they include most of the usual types of Au-Cu (Mo) deposits such as porphyry type and gold-rich epithermal deposits, they share the same charac⁃teristics of mineralization and alteration on the whole. As a group, these deposits are characterized by Te-rich mineralization, abun⁃dant K metasomatism and minerals such as fluorite and roscoelite. Most of these unique mineralization characteristics may be attribut⁃ed to the evolution of composition of ore-related alkaline magmas, and the fluids were under the condition of CO 2-richness, relative oxidation and low sulfidation. Most Cu-Au (Mo) deposits developed in alkaline provinces in a stretching environment also constitute exploration targets in and around alkaline igneous centers. The perspectives of Cu-Au (Mo) deposits related to alkaline rocks in Chi⁃na are tremendous. To better find new deposits of this type, researchers should pay more attention to petrogenesis and their relation to Cu-Au mineralization.%由于超过20%的大型-超大型铜-金(钼)矿床与碱性岩浆有关,因此,该类矿床引起矿床学家的广泛关注。碱性岩有关的铜-金矿床的成矿岩体、物化条件及围岩种类各具特色,成矿成因类型多样,主要的成因类型为斑岩型铜-金(钼)、浅成低温热液脉型金-铜(钼)。总体上,该类矿床的矿化和蚀变具有一定的特征:该类矿床多产出在伸展环境下、均富碲化物矿化、有大量的钾质交代作用、含有氟矿物质和钒云母等,成矿蚀变亦有一定的规律。长英质岩石中经常发生钾长石蚀变,而绢云母、碳酸盐和钾长石的混合蚀变常出现在中基性侵入岩中,水热合成石英和酸性蚀变十分罕见。这种特征矿化可能与碱性岩浆流体演化有关,这种流体富含CO2,且在高氧逸度、低硫逸度条件下释放。在伸展背景下的碱性-钙碱性省寻找此类矿床具有巨大的勘查潜力,尤其在碱性岩体中心及其外围可能形成勘探的靶区。在中国与碱性岩有关的金矿床亦有广阔的找矿前景,在借鉴国外寻找此类矿床经验的同时,仍需加强对与矿化作用有关的岩浆体活动的研究。

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