| 山西大同第四纪火山岩中幔源包体的变形特征及其上地幔流变学意义 |
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| 引用本文： | 陈孝德,林传勇.山西大同第四纪火山岩中幔源包体的变形特征及其上地幔流变学意义[J].地震地质,1997,19(4):26-320. |
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| 作者姓名： | 陈孝德 林传勇 |
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| 作者单位： | 国家地震局地质研究所 |
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| 摘 要： | 山西大同第四纪玄武岩中含有少量小型的幔源包体，主要为尖晶石二辉橄榄岩。包体的变形显微构造反映了上地幔条件下至少有两次变形事件；包体的平衡温度为９００～１０５０℃，平衡压力为１．１～１．７ＧＰａ，对应的来源深度为４０～６０ｋｍ。由包体的变形显微构造推导的上地幔流变学参数表明，该地区上地幔符合大陆拉张带上地幔的特征。在第四纪时期，该地区上地幔仍然继续其底辟上涌过程
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| 关 键 词： | 上地幔 显微构造 第四纪 山西 |
DEFORMATION FEATURES OF MANTLE XENOLITHS FROM QUATERNARY BASALTS IN DATONG, SHANXI PROVINCE AND THEIR RHEOLOGICAL IMPLICATIONS |
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| Abstract: | The Quaternary basalts in Datong, Shanxi Province contain small mantle xenoliths which are generally only 2～3cm in size. These mantle xenoliths comprise mainly spinel lherzolite. The textures of the xenoliths are variable from protogranular to porphyroclastic. The dislocation substructures of olivine from the xenoliths are dominated mainly by dislocation walls representative of high temperature dislocation creep. In addition, some dislocation substructures typical of lower temperature plastic deformation a |
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| Keywords: | Upper mantle Microstructures Quaternary Shanxi Province |
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