榴辉岩中石英出溶体的拉曼光谱学研究及其构造意义

王璐; 金振民; 何谋春

榴辉岩中石英出溶体的拉曼光谱学研究及其构造意义

1.
中国地质大学研究生院, 湖北武汉 430074
2.
中国地质大学地球科学学院, 湖北武汉 430074
3.
中国地质大学资源学院, 湖北武汉 430074

详细信息

作者简介:
王璐（1978－）, 女, 1999年毕业于中国地质大学（武汉）地球科学学院, 获学士学位, 主要从事超高压岩石显微构造研究

中图分类号: P588
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- 被引次数: 0
出版历程
- 收稿日期: 2002-05-09
- 刊出日期: 2003-03-25

Raman Spectrum Study on Quartz Exsolution in Omphacite from Eclogite and Its Tectonic Significances

1.
Graduate School, China University of Geosciences, Wuhan 430074, China
2.
Faculty of Earth Sciences, China University of Geosciences, Wuhan 430074, China
3.
Faculty of Earth Resources, China University of Geosciences, Wuhan 430074, China

摘要

摘要: 利用拉曼光谱学和费氏台方法对若干地区超高压榴辉岩中柯石英和榴辉岩中石英出溶体的超显微构造特征进行了研究.研究结果表明, 石榴石(或绿辉石) 中柯石英向石英相变是一个连续变化过程.绿辉石中石英出溶体和主晶具有一定的晶体学拓扑关系, 即石英出溶体长轴有两个展布方向: 平行于绿辉石(10 0) 裂理面和平行于绿辉石(- 10 1) 面.目前, 部分学者推断榴辉岩绿辉石中石英出溶体可作为超高压变质作用的标志.笔者认为, 棒状定向石英在绿辉石中出溶的温压条件和出溶机理尚未查明.因此, 需加强过量二氧化硅单斜辉石出溶机理的超高压实验研究, 从而为证实石英出溶体作为超高压标志提供实验定量约束.
- 超高压榴辉岩 /
- 柯石英 /
- 石英出溶体 /
- 拉曼光谱
Abstract: The studies on ultra-microstructure characteristic of quartz exsolution in eclogite and coesite in UHP eclogite of several localities are done with the appliance of laser Raman spectroscopy and U-stage. Research results show that the phase transformation of coesite-quartz in garnet and/or omphacite is a continuous process. Topological relationships are present between quartz exsolution in omphacite and its host mineral which shows orientations of two long axes of quartz exsolution parallel to (100) and (-101) of omphacite. At present, some of scholars suggest that the quartz exsolution in omphacite of eclogite is the evidence of UHP metamorphism. However, temperature and pressure condition and the exsolution mechanism of oriented needlelike quartz in omphacite still remain unclear. Therefore further study should be enhanced on experimental study on exsolution mechanism of super-silicate clinopyroxene, which could provide experimental quantitative constraint on quartz exsolution as UHP indicator.
- ultrahigh pressure eclogite /
- coesite /
- quartz exsolution /
- Raman spectroscopy

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图 1 大别山榴辉岩绿辉石、石榴石中柯石英包体显微照片(透射光模式)

a, c.HHW-1, 榴辉岩, 黄花屋; b, d.SM-3, 榴辉岩, 石马.Qz.石英; Cs.柯石英; Omp.绿辉石; Grt.石榴石

Fig. 1. Micrograph of coesite inclusions in omphacite and garnet from eclogites, Southern Dabie, Central China

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图 2 榴辉岩单斜辉石中石英出溶体显微照片

a, b, c为南大别山双河榴辉岩(RP-28);d为瑞士Arami石榴石二辉橄榄岩中石榴石的单斜辉石Cpx包体(A99);a为反射光模式, b, c, d为透射光模式

Fig. 2. Micrograph of quartz exsolutions in clinopyroxenes of eclogites

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图 3 榴辉岩石榴石中柯石英向石英相变的拉曼图谱(GH-4, 港河, 南大别山)

a为柯石英包体的显微照片(透射光模式) 及系统拉曼测试点位示意图; b, c, d分别为1, 4, 5号拉曼测试点位的拉曼图谱

Fig. 3. Raman spectrum showing phase transformation of coesite to quartz in garnet from eclogite

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图 4 绿辉石中石英出溶体的拉曼图谱(RP-28, 榴辉岩, 双河)

a为石英出溶体的显微照片(反射光模式) 及系统拉曼测试点位示意图; b, c, d图分别为1, 2, 3号拉曼测试点位的拉曼图谱

Fig. 4. Raman spectrum of quartz exsolutions in omphacite

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图 5 单斜辉石中石英出溶体与穿插超高压榴辉岩的后期石英脉的拉曼图谱对比

a.中透辉石包体的石英出溶体拉曼图谱(A99, 石榴石二辉橄榄岩, 瑞士Arami); b.中石英出溶体拉曼图谱(RP28, 榴辉岩, 大别双河); c.穿插超高压榴辉岩的后期石英脉拉曼图谱(Wu-5, 大别五庙)

Fig. 5. Raman spectrum comparison between quartz exsolution in Cpx and later quartz vein cutting UHPeclogite

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图 6 石英出溶长轴方向与绿辉石晶格方向的拓扑关系

Fig. 6. Topological relationship between the long-axis quartz of exsolutions and omphacite lattice direction

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