| Rare—Earth Elements and Genesis of Lamprophyres in the Laowangzhai Gold Orefield,Yunnan Province |
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| 引用本文： | 黄智龙,朱成明,等.Rare—Earth Elements and Genesis of Lamprophyres in the Laowangzhai Gold Orefield,Yunnan Province[J].中国地球化学学报,1996,15(2):138-146. |
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| 作者姓名： | 黄智龙 朱成明 |
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| 作者单位： | [1]InstituteofGeochemistry,ChineseAcademyofSciences,Guiyang,550002 [2]GuangzhouInstituteofGeochemistry,Chin |
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| 摘 要： | The Laowangzhai super-large gold orefield,which is situated in northern Mt.Ailao tectonic zone,Yunnan Province,is a typical gold orefield where lamprophyres are temporally and spatially related to gold mineralization.Major element data show that lamprophyres in the orefield are of alkalic series and can be divided into potassic and K-rich calc-alkaline lamprophyres.The rocks are enriched in rare-earth elements as compared with the primary mantle and mid-ocean ridge basalts(MORB).Modelled calculations by the least squares method of Petrological Mixing show that the mantle-source for the lamprophyres in enriched in rarc earth elemeots.The geotectonic development of western Yunnan,Sr and Nd isotopic compositions,incompatible element patterns and linear programing calculations indicate that the fluids were derived from dehydration of submaine sediments which are enriched in ALK,LREE and incompatible elements and then were carried to mantle wedges as a result of plate subduction.That is the main factor leading to the formation of a metasonatic fertile mantle in the area studied.
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| 关 键 词： | 金矿田 云南 稀土元素 煌班岩 古化学 成矿作用 |
Rare-earth elements and genesis of lamprophyres in the Laowangzhai gold orefield,Yunnan Province |
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| Huang Zhilong,Zhu Chengming,Wang Liankui.Rare-earth elements and genesis of lamprophyres in the Laowangzhai gold orefield,Yunnan Province[J].Chinese Journal of Geochemistry,1996,15(2):138-146. |
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| Authors: | Huang Zhilong Zhu Chengming Wang Liankui |
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| Institution: | (1) Institute of Geochemistry, Chinese Academy of Sciences, 550002 Guiyang;(2) Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, 510640 Guangzhou |
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| Abstract: | The Laowangzhai super-large gold orefield, which is situated in northern Mt. Ailao tectonic zone, Yunnan Province, is a typical
gold orefield where lamprophyres are temporally and spatially related to gold mineralization. Major element data show that
lamprophyres in the orefield are of alkalic series and can be divided into potassic and K-rich calc-alkaline lamprophyres.
The rocks are enriched in rare-earth elements as compared with the primary mantle and mid-ocean ridge basalts(MORB). Modelled
calculations by the least squares method of Petrological Mixing show that the mantle source for the lamprophyres is enriched
in rare-earth elements. The geotectonic development of western Yunnan, Sr and Nd isotopic compositions, incompatible element
patterns and linear programing calculations indicate that the fluids were derived from dehydration of submaine sediments which
are enriched in ALK, LREE and incompatible elements and then were carried to mantle wedges as a result of plate subduction.
That is the main factor leading to the formation of a metasomalic fertile mantle in the area studied.
This project was supported by the National Natural Science Foundation of China. |
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| Keywords: | Laowangzhai gold orefield Yunnan lamprophyre rare-earth element genesis |
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