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地质学报  2011 

新疆北天山黄山东含铜镍矿镁铁-超镁铁岩体的岩石成因:主要元素、微量元素和Sr-Nd同位素证据

, PP. 1435-1451

Keywords: 黄山-镜儿泉铜镍成矿带,黄山东镁铁-超镁铁岩体,岩浆铜镍矿床,俯冲交代地幔,地幔柱

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Abstract:

本文对新疆黄山-镜儿泉铜镍成矿带中黄山东岩体进行了主量元素、微量元素和Sr-Nd同位素的研究,探讨了岩体成因和区域构造演化。黄山东岩体有三次岩浆侵入,第一次侵入形成了橄榄辉长岩、角闪辉长岩和闪长岩,构成岩体的主体,其中橄榄辉长岩位于岩体中部,角闪辉长岩位于岩体上部和下部,闪长岩沿岩体边缘分布;第二次侵入形成辉长苏长岩,呈岩墙状分布于岩体西端和西北部;第三次侵入岩石为二辉橄榄岩,位于岩体下部,为主要的赋矿岩相。黄山东岩体样品除橄榄辉长岩和角闪辉长岩TiO2含量之外主量元素投影点都处于橄榄石、单斜辉石、斜方辉石和斜长石矿物化学成分之间,指示它们主要由橄榄石、单斜辉石、斜方辉石和斜长石组成。与塔里木地区地幔柱成因二叠纪镁铁-超镁铁岩体相比,黄山东岩体亏损Nb、Ta、Ti等高场强元素,La、Ba、Th、U等不相容元素含量较低,εNd(t)较高(+7.32~+8.29),并且具有较低的Th/U比值(1.13~2.98)和Nb/U比值(2.53~7.02),较高的La/Nb比值(1.15~4.19)和Ba/Nb比值(37.7~79.82)。这些特征与俯冲成因的火山岩和侵入岩相似,暗示其原始岩浆主要来源于受俯冲流体交代地幔的部分熔融,软流圈地幔的上涌可能为部分熔融提供了热源。

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