新疆包尔图铜矿赋矿变质岩特征及其地质意义
Ore-hosted Metamorphic Rocks and Its Geological Significance of the Baoertu Copper Deposit in Xinjiang
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摘要: 包尔图铜矿位于和硕县乌什塔拉北山区包尔图至库米什断裂带附近，铜矿体主要赋存于艾木太乌拉短轴背斜轴部附近的中元古界长城系星星峡群（Chxn）变质岩中，受断裂构造控制明显。本亚组地层自背斜轴部向两翼由角闪岩相逐步过渡到绿片岩相。矿区内的变质岩既具有中酸性火山岩类岩石化学的特点又具有沉积成因岩石化学的特点，为沉积岩与火成岩过渡类型。矿区内变质岩的地层学、岩相学及地球化学特征，表明其原岩应为一套海相中酸性、基性火山碎屑岩建造。研究区变质作用以区域变质作用为主，后期又叠加有动力变质作用，变质作用对该矿床的形成起到了重要的作用。Abstract: Near the Baoertu-Kumux faults, Baoertu copper deposit near the Baoertu-Kumux faults is in the north area of the Wushitala Mountain named uxxaktal in HeShuo Heshuo County. The copper ore body bodies mainly occur in the metamorphic rocks of the Xingxingxia group (Chxn) of Mesoproterozoic Changcheng System. It is close to the axis of the minor anticline named Aimutaiwula and it is obviously controlled by the faults. This sub-group stratum stratum has a gradually transition transited from amphibolite facies to greenschist facies from the axis of the anticline to its wings. Metamorphic rocks in the mining area not only have the chemical characteristics of neutral-acidic volcanic rocks but also have the characteristics of sedimentary rocks.Its type, which belongsbelong to the transition type of sedimentary rocks to igneous rocks. The stratigraphy, petrography and geochemical features of the metamorphic rocks in the mining area indicate that its original rock should be a combination of marine neutral-acidic and basic pyroclastic rocks. Metamorphism in this study area is dominated by regional metamorphism and superimposed dynamic metamorphism in its late stage. Metamorphism has played an important role in the formation of this deposit.
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