| 某些幔源矿物晶体中异常消光现象的显微喇曼谱研究 |
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| 引用本文： | 王阿莲,郁鉴源,许志琴,郭立鹤.某些幔源矿物晶体中异常消光现象的显微喇曼谱研究[J].岩石矿物学杂志,1992,11(1):52-60. |
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| 作者姓名： | 王阿莲 郁鉴源 许志琴 郭立鹤 |
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| 作者单位： | 中国地质科学院矿床地质研究所，清华大学化学系，中国地质科学院地质研究所，中国地质科学院矿床地质研究所 北京 100037，北京 100084，北京 100037，北京 100037 |
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| 基金项目： | 地质行业科学技术发展基金资助项目No.88090的成果之一 |
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| 摘 要： | 异常消光是一种在幔源晶体中常可观察到的物性改变现象,然而它与晶体的真实结构之间的内在联系却至今仍未被认识清楚。本项工作试图用一种灵敏的微区结构探测新技术——显微激光喇曼谱方法研究幔源晶体中由构造作用导致的异常消光现象的结构本质。实验结果说明:上地幔高温蠕变作用对橄榄石及辉石主要感应了晶体内微区晶轴取向的变化,还未能产生明显的结构相变;不同的异常消光现象反映晶轴扭转的单位大小不同,并主要依赖于矿物晶体本身的结构特性。
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| 关 键 词： | 显微喇曼谱 幔源晶体的异常消光 |
Micro-Raman Spectroscopic Study of the Heterogeneous Extinction Phenomena in Some Mantle-Derived Crystals |
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| Wang Alian,Yu Jianyuan,Xu Zhiqin,Guo Lihe Institute of Mineral Deposits,Chinese Academy of Geological Sciences,Beiging.Micro-Raman Spectroscopic Study of the Heterogeneous Extinction Phenomena in Some Mantle-Derived Crystals[J].Acta Petrologica Et Mineralogica,1992,11(1):52-60. |
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| Authors: | Wang Alian Yu Jianyuan Xu Zhiqin Guo Lihe Institute of Mineral Deposits Chinese Academy of Geological Sciences Beiging |
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| Institution: | Wang Alian,Yu Jianyuan,Xu Zhiqin,Guo Lihe Institute of Mineral Deposits,Chinese Academy of Geological Sciences,Beiging 100037 Department of Chemistry,Qinghua University,Beiging 100084 Institute of Geology,Chinese Academy of Geological Sciences,Beiging 100037 Institute of Mineral Deposits,Chinese Academy of Geological Sciences,Beiging 100037 |
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| Abstract: | Two types of heterogeneous extinction phenomena are observed in the
olivine and pyroxene crystals of a mantle-derived lherzolite xenolith from
Hannuoba, Hebei Province. The laser Raman microprobic analysis indicates
that, in olivine exhibiting a heterogeneous extinction character with obvious
boundary, the Raman bands belonging to different symmetric species appear
regularly in the spectra in different extinction zones. It is proved that there
exists a sudden torsion of crystal axes along the boundary between the
extinction zones. In pyroxene displaying an undulatory extinction character,
the relative intensities of the Raman bands measured from neighboring
points show a gradual change. It is demonstrated that the torsion of crystal
axes in pyroxene lattice takes place progressively.
Three deductions could be drawn from the experiments;
1. High-temperature (>1000Cº)creep strain in the upper mantle could
not result in phase transition in these olivine and pyroxene crystals.
2. The two heterogeneous extinction phenomena are all torsions of crys-
tal axes in essence, but the torsion units are different in size. In olivine,
the size is in micrometer with thousands of unit cells included. In pyroxene,
it is in sub-unit cell level.
3. Under the same pressure-temperature conditions, the type of the
torsion of crystal axes occurring in a crystal lattice mainly depends on the
structural character of the crystal itself. |
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| Keywords: | Micro-Raman spectrum heterogeneous extinction in mantle-derived crystal |
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