投稿时间：2012-05-06
修订日期：2012-12-20
中文摘要:哈日扎铜钼多金属矿床位于东昆仑成矿带东段,是大型斑岩型铜钼多金属矿床。笔者利用锆石LA-ICP-MS U-Pb法,获得花岗闪长斑岩的成岩年龄为(234.5±4.8) Ma(MSWD=0.24);花岗闪长斑岩为其成矿母岩。对哈日扎花岗闪长斑岩的岩石学和地球化学研究表明,花岗闪长岩富SiO2(70.94%~76.08%)、K2O(4.91%~6.07%),贫CaO(0.16%~2.01%)、Na2O(0.24%~0.78%),属钾玄岩系列及高钾钙碱性系列。稀土元素总量变化较大(124.69×10-6~178.68×10-6),稀土元素配分曲线为平缓的右倾型,轻稀土元素相对富集,重稀土元素相对亏损。δEu变化范围0.26~0.30,具有弱负Eu异常。岩石微量元素相对富集大离子亲石元素(LILE),贫高场强元素(HFSE),即相对富集Rb、U、La和Nd,而亏损Ba、Sr、Nb和Y。花岗闪长斑岩形成于同碰撞构造环境。
Abstract:The Harizha Cu-Mo poly-metallic deposit is one of the typical large-size porphyry deposits in the eastern Kunlun metallogenic belt, with the LA-ICP-MS U-Pb age of its mother rock granite diorite-porphyry being (234.5±4.8) Ma(MSWD=0.24). Detailed petrographic and geochemical studies show that the granite diorite-porphyry in Harizha belongs to high-K calc-alkaline series, rich in SiO2(70.94%~76.08%) and K2O(4.91%~6.07%), and poor in CaO(0.16%~2.01%) and Na2O(0.24%~0.78%).The granite diorite-porphyry is characterized by total content of ∑REE varying greatly from 124.69×10-6 to 178.68×10-6, rich in LREE and low HREE, with δEu values from 0.26~0.30. Trace elements show enrichment of LILE such as Rb, U, La and Nd and depletion of HFSE like Ba, Sr, Nb and Y. Granite diorite-porphyry resulted from the syn-collisional tectonic setting.
keywords:geochemistry LA-ICP-MS zircon U-Pb dating geochemical feature tectonic setting granite diorite-porphyry Harizha East Kunlun
文章编号：
中图分类号：P618.41;P618.65
文献标志码：
基金项目:本文得到中国地质调查局地质调查项目(1212011121089,1212010918044)的资助
引用文本：
宋忠宝,张雨莲,陈向阳,江磊,李东生,舒晓峰,栗亚芝,李金超,孔会磊.2013.东昆仑哈日扎含矿花岗闪长斑岩LA-ICP-MS锆石U-Pb定年及地质意义[J].矿床地质,32(1):157~168SONG ZhongBao,ZHANG YuLian,CHEN XiangYang,JIANG Lei,LI DongSheng,SHU XiaoFeng,LI YaZhi,LI JinChao,KONG HuiLei.2013.Geochemical characteristics of Harizha granite diorite-porphyry in East Kunlun and their geological implications[J].Mineral Deposits32(1):157~168
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