| 东蒙地区夕卡岩石榴石稀土元素地球化学及其成因 |
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| 引用本文： | 肖成东,刘学武.东蒙地区夕卡岩石榴石稀土元素地球化学及其成因[J].中国地质,2002,29(3):311-316. |
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| 作者姓名： | 肖成东 刘学武 |
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| 作者单位： | 天津华北地质勘查局,天津,300181 |
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| 摘 要： | 东蒙地区为我国北方重要的夕卡岩型锡银铜铅锌多金属成矿区，不仅矿床发育，而且成矿种类较多，典型矿床有黄岗梁Fe（Sn）、白音诺Pb-Zn-Ag等金属和浩布高Fe（Sn）－PbZnAg（Cu）矿床。研究表明，它们都是中生代岩浆岩与本区二叠系地层相互作用的产物。本文通过对黄岗梁、白音诺和浩布高3个矿床中不同阶段的石榴石夕卡岩矿物学研究，划分出早晚两期夕卡岩石榴石矿物。早期以浅色、他形细粒、均质的钙铁榴石为主，多形成环带的核心；晚期以深色、半自形中粗粒、弱非均质的钙铝榴石为主，多构成环带的边部。同时采用ICP－MS方法对3其中石榴石比较发育的黄岗梁和浩布高2个矿床中石榴石单矿物进行了稀土元素含量的测定。结果表明，矿区早期的石榴石具有岩浆成因的特征，晚期石榴石具有热液交代成因特征，即东蒙地区既有早期岩浆阶段的岩浆型夕卡岩，又有晚期热液交代型夕卡岩的多成因认识。
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| 关 键 词： | 夕卡岩 成因 石榴石 稀土元素 东蒙地区 多金属矿床 |
| 文章编号： | 1000-3657(2002)03-0311-06 |
REE geochemistry and origin of skarn garnets from eastern Inner Mongolia |
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| XIAO Cheng-dong,LIU Xue-wu.REE geochemistry and origin of skarn garnets from eastern Inner Mongolia[J].Chinese Geology,2002,29(3):311-316. |
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| Authors: | XIAO Cheng-dong LIU Xue-wu |
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| Abstract: | Eastern Inner Mongolia,as the most important skarn-type tin- si lver-copper-lead-zinc poly-metallic metallogenic province in northern China ,is characterized by not only well-developed Mesozoic magmatic plutons and t heir related skarn mineral deposits but also a great variety of mineral deposi t types.Based on the mineralogical study of garnets of different stages from the Huanggangliang iron-tin mineral deposit,Baiyinnuo lead-zinc-silver poly metallic deposit and Haobugao skarn lead-zinc-tin deposits,two kinds of gar nets are recognized.The early-stage garnet is mainly andradite,which is light -colored,fine-grained,anhedral and isotropic and in most cases forms the co re of a grain;the late-stage garnet is mainly grossular,which is dark-color ed,medium-to coarse-grained,subhedral and slightly anisometric and mostly fo rms the rim of a grain.In addition,rare earth element (REE)concentrations in garnet separates from the Huanggangliang and Haobugao skarn mineral deposits were determined using ICP-MS.The results sug-gest that the early-stage garn et in the area shows the character of magmatic origin,while the late-stage g arnet indicates a hydrothermal metasomatic origin.So,there are both early-sta ge magmatic skarn and late-stage hydrothermal metasomatic skarn in eastern Inne r Mongolia. |
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| Keywords: | skarn garnet origin REE eastern Inner Mongolia |
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