| 内蒙古霍各乞铜多金属矿床的含矿建造及矿床成因分析 |
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| 引用本文： | 费红彩,董普,安国英,肖荣阁.内蒙古霍各乞铜多金属矿床的含矿建造及矿床成因分析[J].现代地质,2004,18(1):32-40. |
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| 作者姓名： | 费红彩 董普 安国英 肖荣阁 |
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| 作者单位： | 中国地质大学"岩石圈构造、深部过程及探测技术"教育部重点实验室,北京,100083 |
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| 基金项目： | 国家自然科学基金项目(40073013)，国土资源部国际合作与科技司自由探索项目(2000440)。 |
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| 摘 要： | 内蒙古霍各乞矿床是狼山地区著名的大型铜多金属矿床,含矿建造层序依次为中元古界陆缘裂谷拉斑玄武岩系→矿化热水沉积岩系→陆源碎屑岩系。拉斑玄武岩及基性侵入岩大部分变质为绿泥石片岩,但局部残留基性火山岩和辉长岩类变余结构构造,局部达到斜长角闪岩相,且w(Na2O)>w(K2O)。变余辉长岩的稀土总量较低,且轻、重稀土基本没有分异,黑云绿泥片岩的稀土总量较高,其配分曲线呈轻稀土富集、重稀土亏损型。黑云绿泥片岩中B、F、K、Ti、Zn、Rb、Sn、Nb、Ag、Ba、Pb、U相对富集,Cu、Pb、Zn富集系数高于变余辉长岩,表明绿泥石片岩具有热液蚀变的特征。含矿岩段条带状石英岩、透辉透闪石岩的稀土总量偏低,轻、重稀土有明显分异,并表现为特征的正Eu异常。除矿化富集外,微量元素Be、B、F、Rb、Ag、Ba、Th、U也有明显富集,表现了热水富集成因的特征。矿床矿化受岩性层控制的特征明显,并且在一定的构造部位富集,具有热液叠加改造的特征。硫同位素变化范围大,多表现为正值,硫化物δ34S值的大小排序为黄铁矿>磁黄铁矿>黄铜矿>方铅矿、闪锌矿。矿床成因分析表明霍各乞多金属矿床为热水沉积块状硫化物矿化叠加变质热液改造富集而形成的矿床。
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| 关 键 词： | 铜多金属 热水沉积 热液改造 霍各乞 内蒙古 |
| 文章编号： | 1000-8527(2004)01-0032-09 |
| 修稿时间： | 2003年9月15日 |
ORE-BEARING FORMATION AND ITS GENESIS ANALYSIS OF THE HUOGEQI POLYMETAL DEPOSIT IN INNER MONGOLIA |
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| FEI Hong-cai,DONG Pu,AN Guo-ying,XIAO Rong-ge.ORE-BEARING FORMATION AND ITS GENESIS ANALYSIS OF THE HUOGEQI POLYMETAL DEPOSIT IN INNER MONGOLIA[J].Geoscience——Journal of Graduate School,China University of Geosciences,2004,18(1):32-40. |
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| Authors: | FEI Hong-cai DONG Pu AN Guo-ying XIAO Rong-ge |
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| Abstract: | The Huogeqi deposit is a famous large-scale polymetal Cu deposit in the Langshan area,Inner Mongolia. The sequence of ore-bearing formation is spilite group occurring in Middle Proterozoic terrigenous rift, mineralized hydrothermal sedimentary rock and terrigenous clastic rock formation. A large part of the spilite has metamophized into chlorite schist. The original rocks are submarine eruption intrusion rocks such as basic volcanic rock and gabbro and so on, with Na_2O content higher than K_2O, total content of REE is low in blasto-gabbro but high in biotite schist, and its distribution plots show enrichment of light REE and depletion of heavy REE. The elements such as B,F,K,Ti,Zn,Rb,Sr,Nb,Ag,Ba,Pb,U,Th are relatively enriched in biotite schist, the enrichment parameters of Cu,Pb and Zn are higher than those in blasto-gabbro, which suggests that the chlorite schist is of the characteristics of hydrothemeral alteration. Total content of REE in the banded quartzite and diopside-tremolite of the ore-bearing segment is clearly low and there is a distinct differentiation between heavy REE and light REE, and shows the featured positive Eu anomaly.Besides the mineralized enrichment, the trace elements such as Be,B,F,Rb,Ag,Ba, Th, U also show distinct enrichment, suggesting its hydrothermal enrichment genesis. The features of the mineralization of the deposit which is controlled by the lithologic layers and enriched in partial structure are quite apparent, which show the features of hydrothermal stacking modification. Sulfur isotope with a wide range of variation shows positive values but sulfur isotope in vein ore is a little low with the values of 4.07‰ to 16.66‰ ,and the values of δ~(34)S in stratiform ore are from 10.6‰ to 24‰. The sequence of δ~(34)S of sulfate is gradually down from pyrite, pyrrhotite to chalcopyrite, galena and sphalerite. The deposit genesis analysis suggests that the Huogeqi polymetal deposit belongs to hydrothermal modification deposits of hydrothermal sedimentary deposits stacked with hydrothermal alteration. |
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| Keywords: | Cu polymetal deposit hydrothermal sedimentation hydrothermal modification Huogeqi Inner Mongolia |
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