| 南极拉斯曼丘陵长英质片麻岩中夕线石的出溶现象 |
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| 引用本文： | 任留东,王彦斌,刘晓春,赵 越.南极拉斯曼丘陵长英质片麻岩中夕线石的出溶现象[J].岩石矿物学杂志,2008,27(6):524-528. |
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| 作者姓名： | 任留东 王彦斌 刘晓春 赵 越 |
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| 作者单位： | 1. 中国地质科学院,地质研究所,北京,100037
2. 中国地质科学院,地质力学研究所,北京,100081 |
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| 基金项目： | 国家自然科学基金，地质大调查项目，国土资源部百名优秀青年科技人才资助项目，中国科学院所长基金 |
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| 摘 要： | 南极拉斯曼丘陵长英质片麻岩中的粗粒夕线石可能有内部出溶现象,出溶形成的矿物有磁铁矿、钛铁矿-赤铁矿和石英出溶矿物条纹,并有少量的斜方辉石.电子探针成分分析表明,本区夕线石高温结晶时不仅有Fe3 ,可能还有Fe2 、Mg2 和Ti4 的替换,铁氧化物质量分数可高达2.9%;随着温度的不断降低,固溶体互溶度也不断减小,大部分微量组分从夕线石中析出形成出溶结构,而且低温变体中稳定的替换元素以Fd3 为主.铁组分的类质同像替换对物理化学计算和夕线石矿化环境均有所影响,对夕线石晶胞参数a的影响很小,而对b,尤其对c的影响较大,与前人的结论有所不同.
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| 关 键 词： | 夕线石 出溶 铁组分替换 晶胞参数 南极拉斯曼丘陵 |
The exsolution assemblage of sillimanite in quartzofeldspathic gneiss of the Larsemann Hills, East Antarctica |
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| REN Liu-dong,WANG Yan-bin,LIU Xiao-chun and ZHAO Yue.The exsolution assemblage of sillimanite in quartzofeldspathic gneiss of the Larsemann Hills, East Antarctica[J].Acta Petrologica Et Mineralogica,2008,27(6):524-528. |
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| Authors: | REN Liu-dong WANG Yan-bin LIU Xiao-chun and ZHAO Yue |
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| Institution: | Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China;Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China;Institute of Geomechanics, Chinese Academy of Geological Science s, Beijing 100081, China;Institute of Geomechanics, Chinese Academy of Geological Science s, Beijing 100081, China |
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| Abstract: | The exsolution assemblage of sillimanite from quartzofeldspathic gneiss in the Larsemann Hills of East Antarctica consists of magnetite, ilmenite-hematite and quartz exsolution laminae and minor orthopyroxene. A compositional analysis shows that the sillimanite primarily crystallized at high temperature has not only Fe3+ but also Fe2+, Mg2+ and Ti4+ substitutes. Iron oxides can be as high as 2.9%. With the decreasing temperature, the solubility of the other components in sillimanite decreased and most of the dissolved components were exsolved, resulting in the formation of the exsolution texture. The sill imanite stable at low temperature is dominated by Fe3+ substitution for Al in the octhedral coordination. The iron replacement of sillimanite may somewhat affect the physic-chemical calculation and exert negative effects on sillimanite mineralization. The Fe substitution in sillimanite has an insignificant effect on a but a substantial effect on b, especially on c values of the crystal cell lattice. These results are to some extent contradictory to the previous conclusions. |
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| Keywords: | sillimanite exsolution substitution parameters of the crystal cell lattice Larsemann Hills East Antarctica |
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