摘要
根据福建省明溪幔源包体（二辉橄榄岩）中橄榄石晶格优选方位（ＬＰＯ）及其晶体弹性刚度系数，计算了地震波速度及其各向异性．研究结果表明，该区地震波各向异性是由橄榄石塑性流动产生晶格优选方位而引起的．与构造背景有关的ＶＰ，Ｖｓ１，Ｖｓ２和△Ｖｓ分布特征表明，中国东南沿海地区上地幔物质流动方向（由ＮＷＷ向ＳＥＥ）与橄榄石［１００］定向排列方向（ａ轴）和ＶＰ最大方向有一致的趋势．
Olivine-petrofabric data in combination with crystalelastic constants have beenused to calculate velocity anisotropy from mantle-derived xenoliths(1herzolite) inMingxi, Fujian province.It is suggested that seismic anisotropy originates from lattice preferred orientation(LPO) of olivine induced by plastic flow of highly anisotropic olivines. The Patterns of olivine fabric and distribution of Vp, VSV, VSH and△VS with respect to the tectonic setting implies the direction of mantle-matter flowfrom NWW to SEE, which is coincided with the orientation of a-[100] axies(maximum VP direction) of olivine beneath East-South coast region in China.
出处
《地球物理学报》
SCIE
EI
CSCD
北大核心
1994年第4期469-477,共9页
Chinese Journal of Geophysics
基金
国家自然科学基金
关键词
上地幔
橄榄石
晶格方位
地震波
Upper mantle, Olivine, Plastic flow, Lattice preferred orientation,Anisotropy.
