新疆西天山色勒特果勒还原性斑岩-矽卡岩铜钼矿床中石榴子石分带及其成因
Zoning and genesis of garnets in the Seleteguole reduced porphyry-skarn deposit of West Tianshan Mountains, Xinjiang
查看参考文献42篇
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文摘
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新疆色勒特果勒铜钼矿床是形成于晚古生代准噶尔洋向伊犁板块俯冲环境中的斑岩-矽卡岩型矿床。矿体主要产于闪长斑岩、石英闪长斑岩和斑岩体与围岩的接触带矽卡岩中。矿区发育大量的磁黄铁矿,未见原生的磁铁矿、赤铁矿以及石膏等高氧逸度矿物。矿区内的矽卡岩呈层状、似层状产在石炭系东图津河组中。石榴子石在矽卡岩中大量发育,是矽卡岩中最主要的造岩矿物,根据其颜色和形态的变化,主要可以分为3类:①内矽卡岩及岩体中的红色石榴子石;②岩体与灰岩接触带矽卡岩中的棕色石榴子石;③靠近灰岩的灰绿色石榴子石。流体包裹体激光拉曼分析结果显示,矿区内流体包裹体的气相成分大部分为甲烷(CH_4),结合矿区内大量发育的低氧逸度矿物,说明色勒特果勒是一个还原性的斑岩-矽卡岩型矿床。文章对不同类型的石榴子从中心向边缘做了详细的电子探针分析。结果显示,3种石榴子石成分都以钙铝榴石为主,说明这些石榴子石是在酸性还原的条件下形成的。棕色石榴子石具有明显的振荡环带,端员组分随着振荡环带的变化具有较明显差异,其振荡环带有效的记录了成矿热液的演化过程,为示踪成矿流体组成、性质和氧逸度变化提供了重要的信息。 |
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其他语种文摘
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The Seleteguole Cu-Mo deposit in Xinjiang is formed in a continental arc setting caused by the subduction of subduction Junggar Ocean to Yili Block. The mineralization is mainly hosted in quartz diorite porphyry, diorite porphyry and the contact zone skarn between the porphyries and limestone rocks. Abundant pyrrhotites have been found in Seleteguole deposit but absence of primary high oxygen fugacity minerals such as magnetite, hematite and anhydrite. The skarn is layered in the Carboniferous Dongtujinhe Formation. The garnets are widely developed in the skarn and can be divided into three categories based on their colour and shape:① the red garnets which occurred in the endoskarn and the skarn near the porphyries;② the brown garnets in the contact zone between the porphyries and the limestone and ③ the yellow-green garnets near the limestone. The laser Raman analysis show that the gas phase of the fluid inclusions is mainly methane (CH_4),combined with low oxygen fugacity minerals. This suggests that the Seleteguole deposit is a reduced porphyry-skarn deposits. In this paper, detailed electronic probe analyses have been measured from center to the rim of the different types of representative garnets. All the three types of garnet are mainly composed of grossularite Indicating that these garnet are formed in a reduced conditions. The brown garnet has oscillatory zone, composition of the garnet is obviously different with the variation of the oscillation zone. The oscillating zone effectively records the evolution of the hydrothermal fluids and provides important information of the composition, properties and oxygen fugacity of the fluid. |
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来源
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矿床地质
,2017,36(2):412-428 【核心库】
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DOI
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10.16111/j.0258-7106.2017.02.010
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关键词
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地质学
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还原性斑岩矿床
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石榴子石
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环带
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流体
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色勒特果勒
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地址
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中国科学院地球化学研究所, 矿床国家重点实验室, 贵州, 贵阳, 550081
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中国冶金地质总局中南地质勘查院, 湖北, 武汉, 430081
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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0258-7106 |
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学科
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地质学 |
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基金
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国家自然科学基金面上项目
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西部之光项目基金
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文献收藏号
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CSCD:5970560
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