Geochemistry of Rare Earth Elements in Lamprophyres in Laowangzhai Gold Orefield, Yunnan Province
来源期刊：JOURNAL OF RARE EARTHS2000年第1期
论文作者：XU Cheng HUANG Zhi-long XIAO Hua-yun LIU Cong-qiang
Key words：rare earths; lamprophyre; geochemistry; laowangzhai gold orefield;
Abstract: Lamprophyres, widely distributed in the Laowangzhai gold orefield, Yunnan Province, China, and closely related to gold mineralization in time and space, can be distinguished into three kinds: the fresh(weakly altered), the altered, and the mineralized lamprophyres. These lamprophyres in the orefield are similar in the range of REE contents and REE patterns, but definitely different in parameters of LRE/HRE, NLa/Yb etc. The geochemistry of REE in fresh lamprophyre shows that the rock is a product of different partial melting of the enriched mantle. Calculation results of mass balance of REE activity regularity in the process of alteration and mineralization of the lamprophyres in the orefield shows that the altering fluids and mineralizing fluids contain REE, and these fluids are mainly the products of mantle degassing and magma degassing during the lamprophyric magmatism.
XU Cheng1，HUANG Zhi-long1，XIAO Hua-yun1，LIU Cong-qiang1
(1.Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China)
Abstract:Lamprophyres, widely distributed in the Laowangzhai gold orefield, Yunnan Province, China, and closely related to gold mineralization in time and space, can be distinguished into three kinds: the fresh(weakly altered), the altered, and the mineralized lamprophyres. These lamprophyres in the orefield are similar in the range of REE contents and REE patterns, but definitely different in parameters of LRE/HRE, NLa/Yb etc. The geochemistry of REE in fresh lamprophyre shows that the rock is a product of different partial melting of the enriched mantle. Calculation results of mass balance of REE activity regularity in the process of alteration and mineralization of the lamprophyres in the orefield shows that the altering fluids and mineralizing fluids contain REE, and these fluids are mainly the products of mantle degassing and magma degassing during the lamprophyric magmatism.
Key words:rare earths; lamprophyre; geochemistry; laowangzhai gold orefield;
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