青海省纳日贡玛斑岩型铜钼矿床成矿岩体的物质来源及成矿背景分析  

Analysis of Matter Source and Metallogenic Setting of Metallogenic Rock of Narigongma Porphyry CopperMolybdenum Deposit in Qinhai Province

作　　者：栗亚芝[1] 孔会磊[1] 南卡俄吾[1] 李金超[1] 贾群子[1] 杜玉良[1] 陈向阳[1] 宋忠宝[1] 张雨莲[1] 全守村[1] 

机构地区：[1]中国地质调查局西安地质调查中心,西安710054

出　　处：《地质科技情报》2015年第1期1-9,共9页Geological Science and Technology Information

基　　金：中国地质调查局地质大调查项目"青海省地质调查综合研究"(1212010918044);"柴达木周缘及邻区成矿带地质矿产综合调查"(12120113029000)

摘　　要：纳日贡玛斑岩型铜钼矿床是西南三江地区继玉龙特大型斑岩铜矿之后发现的又一大型矿床。在总结矿床地质特征的基础上,对该矿床的含矿斑岩体开展了详细的岩石学,地球化学及S、O、Pb、Sr同位素等特征的研究,并探讨了成矿意义。结果表明:纳日贡玛成矿斑岩体大部分为高钾钙碱性花岗岩,部分为钾玄岩系花岗岩,Ti、Ta、Yb、Ba等元素亏损,富集Zr,Hf、Rb和轻稀土元素,中低初始锶比值结合铅同位素分析结果表明它们主要来源于青藏高原加厚的下部地壳熔融,具有幔源成分的混染。Narigongma porphyry copper-molybdenum deposit is a large deposit in southwest Sanjiang area, and was discovered following the Yulong super-large porphyry copper deposit. On the basis of summari- zing the geological characteristics of the deposit, the authors selected the ore-bearing porphyries for de- tailed research from petrology, geochemistry and S, O, Pb, Sr isotopic characteristics, and discussed the metallogenic significance. Narigongma mineralized porphyry is mainly high-K calc-alkaline granite, and a little shoshonite series. The porphyry is depleted in Ti, Ta, Yb, Ba and enriched in Zr, Hf, RB and LREE. Low-medium initial ratio of strontium and the projection change of lead isotope indicated that the porphyry mainly came from thickening of the lower crust molten Qinghai-Tibet plateau, and the mantle source composition of contamination.

关 键 词：壳幔混熔 物质来源 成矿岩体 斑岩铜矿 成矿背景 纳日贡玛 三江北段 

分 类 号：P588.12[天文地球—岩石学]