新疆黄山东铜镍硫化物矿床成因及成矿模式探讨  

Discussion of genesis and metallogenic model for the Huangshandong Cu-Ni sulfide deposit,Xinjiang

作　　者：展新忠[1,2] 张晓帆[1,2] 陈川[1,2] 柴凤梅[1,2] 赵同阳 徐仕琪 

机构地区：[1]新疆大学,乌鲁木齐830047 [2]新疆中亚造山带大陆动力学与成矿预测重点实验室,乌鲁木齐830047 [3]新疆维吾尔自治区地质调查院,乌鲁木齐830000

出　　处：《矿产勘查》2015年第6期652-660,共9页Mineral Exploration

基　　金：新疆维吾尔自治区自然科学基金(编号:2013211B07)资助

摘　　要：新疆黄山东铜镍矿床成矿类型属于岩浆熔离—贯入型硫化物铜镍矿床,矿床赋存于镁铁—超镁铁质岩体中。成矿岩体微量元素明显具有Nb、Ta的负异常,指示岩浆源区经历过地壳物质的混染;δ18O同位素值显示出岩浆经过混染作用。矿床的成矿模式可概括为:来源于亏损地幔的原始岩浆,遭受了地壳俯冲物质的混染,经后期熔融、结晶分离成上轻下重的熔体,经多次上侵—贯入,形成不同的岩相带和稀疏浸染状、致密浸染状以及块状矿石,即现在出露的富含铜镍的镁铁—超镁铁质矿体。这一模式的建立希望能为该区进一步寻找和深入研究与镁铁—超镁铁质岩有关的矿床提供理论依据和实践指导。The Huangshandong copper-nickel deposit is a magmatic liquation and emplacement type sulfide copper-nickle deposit, the orebody occurs in the mafic-ultramafic rock. The trace elements of the ore-bearing intrusion are characterized with obvious negative anomalies of Nb and Ta elements, which indicate that the source magma has experienced with the mixture of crust source materials. The isotope value of δ^18O also shows that the source magma was mixtured by the crust material. The matallogenic model can be summarized as followings：the primitive magma derived from a depleted mantle was evolved into the melt by the late stage melting and crystallization process, which has experienced the mixture of crustal subduction materials. The different facies zones and various types of copper-nickel ores such as sparse disseminated ore, dense disseminated ore and massive ore, were formed by multi stages of intrusionand emplacement of magma melt, i.e., the outcropped mafic-ultra-mafic type copper-nickel rich deposit.The constructed model will provide the theoritical basis and the practical instruction for prospecting and study of the sulfide deposit related to mafic-ultramafic rock at depth.

关 键 词：铜镍矿 混染作用 成矿模式 黄山东 新疆 

分 类 号：P618.41[天文地球—矿床学] P618.63[天文地球—地质学]