| 江西凤凰岽含锡黄英岩脉特征及成因 |
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| 引用本文： | 熊小林,朱金初.江西凤凰岽含锡黄英岩脉特征及成因[J].矿物岩石,1994,14(1):28-35. |
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| 作者姓名： | 熊小林 朱金初 |
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| 作者单位： | 南京大学地球科学系 |
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| 摘 要： | 江西会昌县岩背火山盆地密坑山含黄玉花岗岩体的北侧外接触带，产有数条含锡黄英岩脉。据野外产状、岩石结构构造等表明岩脉属岩浆成因。稀土元素研究表明，凤凰岽黄英岩ＲＥＥ含量极低，∑ＲＥＥ及配分曲线与脉侧黄玉石英化蚀变岩有着明显的区别。富氟花岗岩浆结晶晚期衍生的富Ｓｉ，Ａｌ，Ｆ含少量Ｋ，Ｎａ的残余熔浆沿断裂上侵因压力降低产生二次沸腾，使Ｋ，Ｎａ分离进入含水相，这是富Ｓｉ，Ａｌ，Ｆ；极贫Ｋ，Ｎａ的黄英岩形成的决定因素。
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| 关 键 词： | 黄英岩，稀土元素，二次沸腾 |
THE CHARACTERISTICS AND GENESIS OF Sn-BEARING TOPAZITE DYKES IN FENGHUANGDONG,JIANGXI PROVINCE |
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| Xiong Xiaolin,Zhu Jinchu,Liu changshi,Shen Weizhou.THE CHARACTERISTICS AND GENESIS OF Sn-BEARING TOPAZITE DYKES IN FENGHUANGDONG,JIANGXI PROVINCE[J].Journal of Mineralogy and Petrology,1994,14(1):28-35. |
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| Authors: | Xiong Xiaolin Zhu Jinchu Liu changshi Shen Weizhou |
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| Abstract: | Fenhuangdong Sn-bearing topazite occurs as dykes in the contact zone of Mikenshan granite(topaz-bearing granite)in the Yanbei volcano basin in Jiangxi Province. Structural,textural,mineralogical and rare earth element evidences suggest a dominantly magmatic genesis for those dykes.These topazite dykes may be formed by the residual magma evolved from the F-rich granite (Miken-shan granite).The topazitic melt,a Si,Al,F-rich and K,Na-poor magma,was obtained through second boiling which caused the alkalies of residual magma to be partitioning into aqueous phase. |
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| Keywords: | Topazite rare earth elements second boiling |
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