| 豫西雷门沟斑岩钼矿床钾长石化蚀变特征及其成矿意义 |
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| 引用本文： | 陈小丹,叶会寿,汪欢.豫西雷门沟斑岩钼矿床钾长石化蚀变特征及其成矿意义[J].现代地质,2012,26(3):478-488. |
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| 作者姓名： | 陈小丹 叶会寿 汪欢 |
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| 作者单位： | 1. 中国地质大学地球科学与资源学院,北京,100083
2. 中国地质科学院矿产资源研究所,北京,100037 |
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| 基金项目： | 国土资源部全国危机矿山接替资源找矿项目 |
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| 摘 要： | 豫西雷门沟钼矿床属于东秦岭钼矿带典型的斑岩型矿床之一,矿床广泛发育钾长石化,呈面型和线型2种形式产出。据野外观察,面型钾长石化以成矿前钾长石化蚀变围岩为特征,包括钾长石化花岗斑岩和钾长石化片麻岩,蚀变岩石主要由钾长石构成,少量石英和斜长石残留,蚀变强烈时石英、斜长石等消失,全岩钾长石化,为成矿前围岩蚀变;线型钾长石化包括钾长石细脉、钾长石-萤石辉钼矿脉和石英辉钼矿脉边部的钾长石化晕,钾长石呈脉状充填或者交代脉边部的石英,为成矿阶段蚀变。电子探针成分分析表明,蚀变形成的钾长石K2O含量较高,Na2O、CaO含量较低。X衍射结构显示,蚀变形成的钾长石为微斜长石,蚀变温度为310～418℃,表明由碱性热液交代形成。Pb同位素组成显示钾长石中K质主要来源于地幔。根据成矿热液具有富碱质的地幔来源特征,结合Mo元素地球化学特征,认为退化碱质交代作用有助于雷门沟斑岩钼矿床的形成。
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| 关 键 词： | 钾长石化 X衍射 Pb同位素 雷门沟斑岩钼矿床 豫西 |
Alteration Characteristics of K-feldspar in Leimengou Porphyry Mo Deposit in Western Henan Province and Its Insight into Metallogenetic Process |
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| CHEN Xiao-dan
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YE Hui-shou
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WANG Huan.Alteration Characteristics of K-feldspar in Leimengou Porphyry Mo Deposit in Western Henan Province and Its Insight into Metallogenetic Process[J].Geoscience——Journal of Graduate School,China University of Geosciences,2012,26(3):478-488. |
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| Authors: | CHEN Xiao-dan YE Hui-shou WANG Huan |
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| Institution: | 1(1.School of Earth Sciences and Resources,China University of Geosciences,Beijing 100083,China; 2.Institute of Mineral Resources,Chinese Academy of Geological Sciences,Beijing 100037,China) |
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| Abstract: | Leimengou Mo deposit in Western Henan Province is a typic porphyry Mo deposit in East Qinling Molybdenum belt.The deposit pervasively develops K-feldspar alteration,including vein type and whole rock alteration.The whole rock alteration charactered as the porphyry and the gneiss being potassic altered absolutely.Vein type alteration is represented by the K-feldspar slevage,K-feldspar fluorite vein amd K-feldspar halo beside the margin of quartz-molybdenum veinnet.This paper analyzed the alteration features of K-feldspar,composition of altered minerals,X-ray powder diffraction and Pb isotope composition of types of altered K-feldspar.The compositions of feldspar show that K2O is the main compontent;X-ray powder diffraction data suggest that K-feldspar are andesine-microcline with alteration temperatures of 310-418 ℃.Pb isotope composition show that K in K-feldspar originates from mantle.According to the mantle derived characteristics of the ore-forming fluid,combining with the geochemistry of Mo,we conducted that the K-feldspar alteration has a good interpretation on the metallogenic process. |
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| Keywords: | K-feldspar alteration X-ray diffraction Pb isotope Leimengou porphyry Mo deposit Western Henan Province |
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