| 湖南道县辉长岩包体的组构与波速各向异性研究及其意义 |
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| 关键词:gabbro xenolith mineral fabric anisotropy elastic wave measurment |
| 基金项目:地矿部华南重大项目(9501109); 中南工业大学青年科学研究基金共同资助 |
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| Mineral Fabrics and Seismic Wave Anisotropy of Gabbro Xenoliths from Daoxian Alkaline Basalt, Hunan Province |
| Seismic wave anisotropy of the lower-crust has becrme an important topic in recent years. We can get some information of the lower-crust by such geophysical methods as reflection and refraction, and some work on xenolith samples also gives us much beneficial information, including elastic velocity measurments and rock fabric measurments at U stage. In this paper, fabrics of main rock-forming minerals like plagioclase, clinopyroxene and orthopyroxene in two kinds of gabbro xenoliths have been studied. Fabric figures show that b axis of plagioclase has preferred orientation vertical to lineation. This shape is the same as the bedding gabbro intrusions in Late Paleozoic Panxi rift. Synthetic velocity calculated from fabrics, densities and rock components is consistent with the measurements in laboratory. This implies that anisotropy of the lower crust strongly depends on LPO of main minerals, which can be used to interpret strong reflection in seismic wave reflection of the lower crust. |
| KONG Hua,JIN Zhen-min,MA Fang,OU Xin-gong.2000.Mineral Fabrics and Seismic Wave Anisotropy of Gabbro Xenoliths from Daoxian Alkaline Basalt, Hunan Province[J].Acta Geoscientica Sinica,21(3):287-293. |
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