| 超临界流体的快速泄出:来自霓辉石英脉的证据 |
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| 引用本文： | 郝金华,罗照华,梁涛,卢仁,刘晓,白凤军.超临界流体的快速泄出:来自霓辉石英脉的证据[J].岩石学报,2014,30(11):3481-3489. |
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| 作者姓名： | 郝金华 罗照华 梁涛 卢仁 刘晓 白凤军 |
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| 作者单位： | 中国地质大学科学研究院, 北京 100083;中国地质大学地质过程与矿产资源国家重点实验室, 北京 10008;中国地质大学地质过程与矿产资源国家重点实验室, 北京 10008;河南省有色金属地质勘查总院, 郑州 450052;河南省有色金属地质勘查总院, 郑州 450052;中国地质大学地质过程与矿产资源国家重点实验室, 北京 10008;河南省有色金属地质勘查总院, 郑州 450052 |
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| 基金项目： | 本文受栾川正龙矿业有限公司委托项目(ZLKY2012-02)、973项目(2011CB808901)、中国地质调查局地质调查项目(1212011220921)和中央高校基本科研业务费(2-9-2012-021)联合资助. |
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| 摘 要： | 河南外方山地区熊耳群火山岩中新发现了一种霓辉石英脉群,脉表现出独特的矿物组合及晶体特征,如霓辉石英脉具有复杂的矿物组成,表现出强烈的不平衡特点;霓辉石英脉具明显的对称分带特征,各分带中矿物组成及特征显著不同;存在具熔蚀边结构的钾长石-霓辉石集合体团块;霓辉石具在明显核幔结构,内核化学成分与幔边部存在较大差异;钾长石晶体元素分布存在似"文象"结构,表现出Fe元素的熔体分离特征;脉中矿物普遍发育环带结构;霓辉石英脉交代致密火山岩围岩形成蚀变带,新生大量榍石、霓辉石等矿物且含量随着与脉壁距离的增加急剧减少,显示出强烈的流体/气体扩散交代作用.霓辉石英脉独特的矿物组合及晶体特征反映了其成因的复杂性以及生长环境的变化.根据霓辉石英脉矿物的特点,推测其源于流体、熔体和晶体的混合物,并经历了快速侵位、快速冷却的过程,因而能够保存流体演化各阶段的结晶信息,保留不同成因的晶体群.外方山霓辉石英脉矿物可划分为捕虏晶亚群、熔体晶体群、超临界流体亚群、热液晶体亚群和凝聚晶体亚群等.外方山霓辉石英脉矿物晶体群的深入研究可能有助于揭示岩浆熔体向流体转换的机制及侵位机制,进而可揭示岩浆-流体成矿作用.
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| 关 键 词： | 霓辉石英脉群 矿物组合 晶体特征 晶体群 河南外方山地区 |
| 收稿时间： | 2014/2/26 0:00:00 |
| 修稿时间： | 2014/6/18 0:00:00 |
Rapid escape of super-critical fluid: Evidence from aegirine-augite quartz veins |
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| HAO JinHu,LUO ZhaoHu,LIANG Tao,LU Ren,LIU Xiao and BAI FengJun.Rapid escape of super-critical fluid: Evidence from aegirine-augite quartz veins[J].Acta Petrologica Sinica,2014,30(11):3481-3489. |
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| Authors: | HAO JinHu LUO ZhaoHu LIANG Tao LU Ren LIU Xiao and BAI FengJun |
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| Institution: | Institute of Geosciences, China University of Geosciences, Beijing 100083, China;State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing 10008;State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing 10008;General Institute of Non-ferrous Metals Geologic Exploration of Henan Province, Zhengzhou 450052, China;General Institute of Non-ferrous Metals Geologic Exploration of Henan Province, Zhengzhou 450052, China;State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing 10008;General Institute of Non-ferrous Metals Geologic Exploration of Henan Province, Zhengzhou 450052, China |
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| Abstract: | A new kind of aegirine-augite quartz vein was discovered in the volcanic rocks of the Xionger Group located at Waifang mountain of Henan Province, which has abundant mineral assemblages and unique characteristics of crystals. The vein contains complex minerals with heterodox mineral fractions. Aegirine-augite quartz veins show a clear zonation symmetrical feature, and each sub-band has significantly different mineral assemblages and characteristics. There exist K-feldspar and aegirine-augite aggregations in veins which exhibit corroded edge structure. The majority of aegirine-augite shows the core-mantle texture and the chemical compositions of the core and mantle display obviously different. K-feldspars are with hieroglyph texture and show the fraction of Fe-enriched melt. The dense volcanic wall rocks have been altered by these veins and formed alteration zones. With increasing distance from the vein, the newborn titanite and aegirine-augite dramatically reduce in the alteration zone, which indicates intense fluid/vapor diffusive metasomatism. Assemblages of minerals and characteristics of crystals in the veins reveal complex genesis and various growth environments. Based on these characteristics, we can infer that the veins were originated from the mixture of fluid, melt and crystal which have experienced rapid emplacement and cooling, so the different crystals phase in this process can be recorded and then yielded different crystal populations. The minerals in the aegirine-augite quartz veins can be subdivided into xenocryst-crystal population, melt-crystal population, supercritical fluid sub-population, hydrothermal crystal sub-population and condensation crystal sub-population. The study of aegirine-augite quartz veins could be helpful to improve the understanding of magmatic-hydrothermal transition and magmatic-hydrothermal ore-forming process. |
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| Keywords: | Aegirine-augite quartz veins Mineral assemblages Characteristics of crystals Crystal population Waifang mountain Henan Province |
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