展新忠;岳建华;陈川;杨勇;张河瑞;张博文;

• 1:中国矿业大学资源与地球科学学院
• 2:新疆大学地质与矿业工程学院
• 3:新疆大学新疆中亚造山带大陆动力学与成矿预测实验室

摘要(Abstract)：

喇嘛苏外围铜矿床产于花岗闪长斑岩、花岗斑岩内及外接触带矽卡岩中.文章利用LA-ICP-MS锆石UPb测年法,获得矿区花岗闪长斑岩和花岗斑岩的⁽²⁰⁶⁾Pb/(206)Pb/⁽²³⁸⁾U年龄,分别为385.9±1.2Ma和387.6±1.3Ma,表明它们是中泥盆世岩浆活动的产物.锆石Lu-Hf同位素具有较高的(238)U年龄,分别为385.9±1.2Ma和387.6±1.3Ma,表明它们是中泥盆世岩浆活动的产物.锆石Lu-Hf同位素具有较高的⁽¹⁷⁶⁾Hf/(176)Hf/⁽¹⁷⁷⁾Hf(0.282 53～0.282 72)值,εHf(t)值为-0.38～6.38,变化大且绝大多数为正值(-0.38、-0.15和-0.05除外),二阶段Hf模式年龄(t DM2)变化于971～1 401Ma(平均1 203.8Ma).上述特征表明,喇嘛苏外围铜矿区花岗质岩石为同源岩浆演化的产物,岩浆起源于亏损地幔并有新生壳源部分熔融物质的加入,形成于北天山洋向南部的伊犁地块俯冲的构造背景.

关键词(KeyWords)： 锆石U-Pb年龄;Hf同位素;花岗质岩;新疆西天山

Abstract:

Keywords:

基金项目(Foundation): 新疆维吾尔自治区自然科学基金项目(2016D01C067);; 新疆维吾尔自治区重点实验室开放课题(2016D03002)

作者(Authors): 展新忠;岳建华;陈川;杨勇;张河瑞;张博文;

DOI: 10.13568/j.cnki.651094.2018.03.004

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