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新疆包古图斑岩铜矿III-2岩体氧逸度研究:来自矿物成分的指示
投稿时间:2019-07-28  修订日期:2019-11-01  点此下载全文
引用本文:
DOI:10.19762/j.cnki.dizhixuebao.2020042
摘要点击次数: 94
全文下载次数: 73
作者单位E-mail
魏少妮 西安科技大学地质与环境学院 weishaoni03@163.com 
朱永峰 北京大学地球与空间科学学院  
安芳 西北大学地质系  
基金项目:国家自然科学基金项目(No. 41403033; No. 41602212),陕西省自然科学基础研究计划一般项目(面上)(2019JM-409)
中文摘要:包古图斑岩铜矿位于新疆西准噶尔地区,成矿作用与晚石炭世中酸性侵入体密切相关。III-2岩体位于矿区南部,以石英闪长(玢)岩和闪长岩为主,少量辉石闪长岩。该岩体全岩矿化,但品位较低,是探讨成矿岩浆性质的理想对象。石英闪长岩中早期结晶的自形角闪石Mg#较高(0.72 ~ 1.00),成分分析指示成矿岩浆的氧逸度为:?NNO+1.4 ~ ?NNO+2.6,位于斑岩铜矿含矿岩体的分布范围。从中分选出的锆石REE含量高(338ppm ~ 959ppm),Ce4+/Ce3+比值为29.55 ~ 89.50,Eu/Eu*比值为0.32 ~ 0.47,分布于斑岩铜矿含矿岩体和未矿化岩体的叠加部位。研究结果显示,包古图斑岩铜矿III-2岩体成矿岩浆氧逸度较高,有利于成矿元素的溶解和迁移,对斑岩铜矿的形成有促进作用。
中文关键词:氧逸度  斑岩铜矿  包古图  西准噶尔
 
Oxygen fugacity of the intrusion III-2 in Baogutu porphyry copper deposit, Xinjiang: evidence from mineral compositions
Author NameAffiliationE-mail
WEI Shaoni College of Geology and Environment,Xi’an University of Science and Technology,Xi’an weishaoni03@163.com 
ZHU Yongfeng The Key Laboratory of Orogenic Belts and Crustal Evolution,School of Earth and Space Sciences,Peking University,Beijing  
AN Fang State Key Laboratory of Continental Dynamics,Department of Geology,Northwest University,Xi’an  
Abstract:Baogutu porphyry copper deposit is located in the west Junngar, Xinjiang. The ore-forming processes are colsely associated with the late Carboniferous intermidate-acidic intrusions. The intrusion III-2, located in the south of the mine, is mainly composed of quartz diorite (porphyry) and diorite, with a small amount of proxeney diorite. With the characteristics of wholly mineralized and low grade, the intrusion is an ideal sample for investigation of the nature of the ore-forming magma. Early stage euhedrae amphiboles from quartz diorite have a high Mg# (0.72-1.00). The oxygen barometer based on amphibole compositions provides logfO2 values varing from ?NNO+1.4 to ?NNO+2.6, which is in the variation range of ore-bearing intrusions from porphyry copper deposits wordwild. Zircons from quartz diorite are characterized by high REE content (338ppm ~ 959ppm) and moderate Ce4+/Ce3+(29.55 ~ 89.50) and Eu/Eu*ratios (0.32 ~ 0.47), which are in the overlapping portion of ore-bearing and ore-barren intrusions from porphyry copper deposits. These data indicate that the oxygen fugacity of the ore-forming magma of the Baogutu intrusion III-2 are relatively high, which is benificial to the dissolution and migration of metal elements, and also facilitate to the formation of poyphyry copper deposits.
keywords:Oxygen fugacity  Porphyry copper deposit  Baogutu  West Junngar
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