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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:魏少妮,朱永峰,安芳.2020.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[J].地质学报,94(8):2367-2382.
WEI Shaoni,ZHU Yongfeng,AN Fang.2020.Oxygen fugacity of the intrusion III- 2 in the Baogutu porphyry copper deposit, Xinjiang: evidence from mineral compositions[J].Acta Geologica Sinica,94(8):2367-2382.
DOI:10.19762/j.cnki.dizhixuebao.2020042
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作者单位E-mail
魏少妮 1) 西安科技大学地质与环境学院, 西安, 710054 weishaoni03@163.com 
朱永峰 2) 北京大学地球与空间科学学院, 北京, 100871  
安芳 3)西北大学地质系, 西安, 710069  
基金项目:本文为国家自然科学基金项目(No.41403033; No.41602212)和陕西省自然科学基础研究计划一般项目(面上)(2019JM- 409)联合资助成果。
中文摘要:包古图斑岩铜矿位于新疆西准噶尔地区,是区内规模最大的斑岩型矿床,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,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。本文结合岩石学和角闪石、锆石等矿物成分分析,通过与典型斑岩铜矿进行对比,探讨了成矿岩浆的氧逸度。研究表明,包古图III- 2岩体以石英闪长(玢)岩和闪长岩为主,少量辉石闪长岩,主要由斜长石、角闪石、黑云母、石英和钾长石组成,含少量钛铁矿、榍石和磷灰石。石英闪长岩中早期结晶的自形角闪石属于钙质闪石,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(338×10-6~959×10-6),具有左倾型稀土配分模式,轻稀土亏损,重稀土富集,显示强烈Ce正异常和Eu负异常。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  成矿岩浆  包古图  西准噶尔
 
Oxygen fugacity of the intrusion III- 2 in the Baogutu porphyry copper deposit, Xinjiang: evidence from mineral compositions
Author NameAffiliationE-mail
WEI Shaoni 1) College of Geology and Environment, Xi’an University of Science and Technology, Xi’an, 710054 weishaoni03@163.com 
ZHU Yongfeng 2) School of Earth and Space Sciences, Peking University, Beijing, 100871  
AN Fang 3) Department of Geology, Northwest University, Xi’an, 710069  
Abstract:Baogutu porphyry copper deposit, the largest porphyry type deposit of the area, is located in the west Junngar, Xinjiang. The ore- forming processes are closely associated with the late Carboniferous in termidate- acidic intrusions. The intrusion III- 2, located in the south of the mine, with the characteris tics of wholly mineralized and low grade, is an ideal sample for investigation of the nature of the ore- forming magma. In thispaper, oxygen fugacity of ore- forming magma was disscussed on the basis of petrology and mineral compositions of amphibole and zircon, by comparison with typical porphyry copper deposits. The results show that the Baogutu intrusion III- 2 is mainly composed of quartz diorite (porphyry) and diorite, with a small amount of pyroxene diorite. Plagioclase, amphibole, biotite, quartz and potassium feldspar are the major ore- forming minerals, with minor ilmenite, sphene and apatite. Early stage euhedrae amphiboles from quartz diorite are classified as calcic amphibole with high Mg# (0. 72~1. 00). The oxygen barometer based on amphibole compositions provides log f O2 values ranging from △NNO+1. 4 to △NNO+2. 6, which is in the variation range of ore- bearing intrusions from porphyry copper deposits worldwide. Zircons from quartz diorite are characterized by high REE content (338×10-6~ 959×10-6). With depleted LREE and enriched HREE, these zircons display left- leaning REE patterns and strongly positive Ce and negtive Eu anomalies. The moderate Ce4+/Ce3+(29. 55~89. 50) and Eu/Eu* ratios (0. 32~0. 47) 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 beneficial for the dissolution and migration of metal elements, and also facilitates the formation of poyphyry copper deposits.
keywords:oxygen fugacity  porphyry copper deposit  ore- forming magma  Baogutu  West Junngar
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