新疆西天山喇嘛苏外围铜矿床花岗质岩锆石LA-ICP-MSU-Pb测年及地质意义

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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新疆西天山喇嘛苏外围铜矿床花岗质岩锆石LA-ICP-MSU-Pb测年及地质意义

更新时间：2026-01-21

- 新疆西天山喇嘛苏外围铜矿床花岗质岩锆石LA-ICP-MSU-Pb测年及地质意义
- Journal of Xinjiang University (Natural Science Edition in Chinese and English) Vol. 35, Issue 3, Pages: 272-280(2018)
- 作者机构：
  
  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
- 作者简介：
- 基金信息：
- DOI：10.13568/j.cnki.651094.2018.03.004
  CLC： P588.121;P618.41
- Published：2018
- 稿件说明：
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[1]展新忠,岳建华,陈川,等.新疆西天山喇嘛苏外围铜矿床花岗质岩锆石LA-ICP-MS U-Pb测年及地质意义[J],2018,35(03):272-280.
[1]展新忠,岳建华,陈川,等.新疆西天山喇嘛苏外围铜矿床花岗质岩锆石LA-ICP-MS U-Pb测年及地质意义[J],2018,35(03):272-280. DOI： 10.13568/j.cnki.651094.2018.03.004.

DOI：10.13568/j.cnki.651094.2018.03.004.

摘要

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206Pb/238U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176Hf/177Hf(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.

Abstract

This deposit is important because the ore body formed within granodiorite and granite porphyries as well as in the skarn of the outer contact zone. We apply zircon laser ablation inductively coupled plasma mass spectrometry(LA-ICP-MS) dating to generate 206 Pb/238 U ages for these granodiorite and granite porphyries in the Lamasu peripheral copper deposit

recovering ages of 385.9 ± 1.2 million years(Ma) and 387.6 ± 1.3 Ma

respectively. These dates indicate that the deposits are the product of middle Devonian magmatism. The zircon Lu-Hf isotope ratio of this granite also has relatively high 176 Hf/177 Hf values

between 0.282 53 and 0.282 72

as well as a εHf(t) that varies between -0.38 and 6.38 but that is mostly positive(i.e. excluding the range between -0.38

-0.15 and-0.05). These characteristics all demonstrate that the granite containing the Lamasu peripheral copper deposit is the product of co-magmatic evolution originating from depleted mantle alongside partially molten young crust that developed against the tectonic background of the North Tianshan ocean subducting towards the southern Yili Plate.

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