CAJ | 학술논문

秦祁昆结合部广泛发育中三叠世岛弧钙碱性岩浆作用，已发现大量与其相关的斑岩型-夕卡岩型铜金、铜钼和银铅锌多金属矿床。瓦勒根金矿床是近年来在该区新发现的一个斑岩型金矿床，矿区内出露有众多的石英斑岩和花岗斑岩，且均发育有金矿化，其中石英斑岩与金矿化关系更为密切。LA-ICP-MS锆石U-Pb年龄表明，花岗斑岩形成于中三叠世（237Ma），其中包含有丰富的晚古生代及元古宙继承性锆石。这一特征与区域上的斑岩型铜金矿床含矿岩体具有相似性。进一步说明，古特提斯洋在秦祁昆结合部发生向北消减所形成的岩浆捕获了早于三叠纪的壳源和幔源物质，从而形成了岛弧钙碱性岩浆及相关的斑岩型-夕卡岩型矿床组合。
진기곤결합부엄범발육중삼첩세도호개감성암장작용，이발현대량여기상관적반암형-석잡암형동금、동목화은연자다금속광상。와륵근금광상시근년래재해구신발현적일개반암형금광상，광구내출로유음다적석영반암화화강반암，차균발육유금광화，기중석영반암여금광화관계경위밀절。LA-ICP-MS고석U-Pb년령표명，화강반암형성우중삼첩세（237Ma），기중포함유봉부적만고생대급원고주계승성고석。저일특정여구역상적반암형동금광상함광암체구유상사성。진일보설명，고특제사양재진기곤결합부발생향북소감소형성적암장포획료조우삼첩기적각원화만원물질，종이형성료도호개감성암장급상관적반암형-석잡암형광상조합。
The middle Triassic calc-alkaline arc magmatism and its related porphyry-skarn type Cu-Au, Cu-Mo and Ag-Pb-Zn polymetallic deposits are widespread at the juncture of Qinling-Qilian-Kunlun orogens. The Walegen Au deposit is a newly-dis-covered porphyry deposit. The host rocks of the Walegen deposit are quartz porphyry and granite porphyry, with the quartz porphy-ry more closely related to gold mineralization. The results of zircon U-Pb analysis by using LA-ICP-MS technique indicate that the granite porphyry was formed in middle Triassic (237Ma), and contained voluminous Paleozoic-Proterozoic inherited zircons. These characteristics are similar to characteristics of other porphyry Cu-Au deposits in this region. These data suggest that the mag-mas produced by northward subduction of Paleo-tethys ocean captured pre-Triassic crust and mantle materials, resulting in the arc magmatism and the formation of related porphyry-skarn deposit assemblage at the juncture of Qinling-Qilian-Kunlun orogens.