云南省大红山铁铜矿床含矿变质岩系原岩恢复及其形成环境
Restoration of the ore-bearing metamorphic rocks and its formation environment in the Dahongshan iron-copper deposit, Yunnan Province
查看参考文献87篇
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文摘
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大红山铁铜矿床产于下元古界大红山群变质火山-沉积岩建造中,目前对于含矿变质岩系的成因和原岩构造环境还存在较大争议,制约了对区内成矿过程和规律的认识。为查明赋矿围岩的原岩类型及其成岩环境,本文系统研究了主要含矿变质岩系(变钠质火山岩、云母片岩及大理岩等)和辉长辉绿岩体(脉)的主量、微量及稀土元素组成,在此基础上探讨了其成岩构造环境。分析结果显示,含矿岩系具有贫钾、低钛、富钠的特征;变钠质火山岩明显亏损Ba、Sr、Ti,轻微亏损Zr、Hf、Nb,相对富集Th、Nd、Sm、La等,稀土元素含量总体较低,相对富集轻稀土元素(LREE/HREE=1.84~9.43),具较显著的Eu正异常(δEu=0.91~3.59,平均值为1.62)和不明显的Ce异常,与现代洋中脊、陆内裂谷等构造背景下的喷流沉积或高温海底火山作用产物的特征相似。综合研究认为,云母片岩原岩为钙质泥岩,变钠质熔岩和变钠质凝灰岩原岩为半深海环境喷发的富钠火山岩,且受到了后期热液叠加作用的影响。变钠质火山岩、辉长辉绿岩等具有非造山的大陆裂谷玄武岩特征,可与区域上同期岩浆岩对比,表明它们均为同一大陆裂谷环境下岩浆活动的产物,可能代表了Columbia超大陆的裂解过程在扬子板块西缘的响应,大陆裂解为幔源岩浆的运移提供了通道,进而为康滇铁铜多金属成矿带的形成提供了良好的物质基础。 |
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其他语种文摘
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The Dahongshan iron-copper deposit is hosted in metavolcanic to metasedimentary rocks of the Paleoproterozoic Dahongshan Group. Up to now, the genesis and tectonic environment of these ore-bearing rocks have been still controversial, which seriously restricts the understanding of the metallogenic mechanism and process. In order to identify the original rock types and diagenetic tectonic environment of these host rocks, the authors systematically studied major, trace and rare earth element compositions of main ore-bearing metamorphic rock series, including the meta-sodic volcanic rocks, mica schists and marbles, as well as the gabbro-diabase rocks. According to the results obtained, the ore-bearing rocks are characterized by poor K, Ti and rich Na, the meta sodic volcanic rocks are relatively depleted in Ba, Sr and Ti, weakly depleted in Zr, Hf and Nb, and are enriched in Th, Nd, Sm and La; their total content of rare earth elements are generally low, with LREEs relative enrichment(LREE/HREE=1.84~9.43), significant Eu positive anomalies(δEu=0.91~3.59, mean=1.62), and no obvious Ce anomalies. These characteristics are similar to those of rocks from jet deposition or high temperature submarine volcanism in the modern mid-ocean ridge or intracontinental rift. According to the comprehensive study, the protolith of mica schist may have been a calcareous mudstone, while the protoliths of meta-sodic lavas and meta-sodic tuffs are volcanic rocks which erupted in the bathyal environment, with high Na content. Meta-sodic volcanic rocks and gabbro-diabase rocks show similar anorogenic features to the magmatic rocks in the same period of Kangdian area, indicating that they are all products of magmatic activities in the same continental rift environment which may represent the Columbia supercontinent cracking process on the western margin of Yangtze block. The continental breakup generated some channels for the migration of mantle-derived magma, and provided a good material basis for the formation of the iron copper polymetallic metallogenic belt in Kangdian area. |
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来源
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岩石矿物学杂志
,2021,40(2):429-451 【核心库】
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关键词
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含矿岩系
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微量元素
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构造环境
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大红山铁铜矿床
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云南
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地址
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1.
昆明理工大学国土资源工程学院, 云南, 昆明, 650093
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玉溪大红山矿业有限公司, 云南, 新平, 653405
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中国科学院地球化学研究所, 矿床地球化学国家重点实验室, 贵州, 贵阳, 550081
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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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1000-6524 |
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学科
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地质学 |
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基金
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国家自然科学基金资助项目
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国家重点研发计划项目
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云南省应用基础研究计划项目
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文献收藏号
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CSCD:6933942
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