摘要
利用大别山超高压榴辉岩中绿辉石的实测组构数据，计算了超高压榴辉岩的波速各向异性值．通过与实测值比较，探讨了相辉岩的波速各向异性与绿辉石晶格优选方位的关系．结果表明：绿辉石的晶格优选方位是引起榴辉岩波速各向异性的主要原因，但不是唯一因素，岩石的其它几何学特征如石榴子石形态组构等对其波速也有影响；绿辉石ＬＰＯ在不同的方向上对Ｖｐ的影响不一样；在Ｙ轴上，即平行于面理，垂直干线理的方向上，剪切波Ｖｓ慢波的波速最小，剪切波快波的最大波速和最小波速与线理面理方向有２０°～３０°左右的偏差．
The anisotropy of ultra-shigh-pressure eclogite in Dabie mountains has been studied using the measured omphacite fabric data and the relationship between anisotropy of eclogite and omphacite LPO is discussed based on comparison with the experiment-determind wave-speed data. The results indicate that: the omphacite LPO is the main cause of the wave-speed anisotropy of eclogite, but other factors, such as garnet shape fabrics, have also certain influences; the omphacite LPO has a different influence on the V at different directions; along the Y dircchon, which is parallel to foliation and vertical to lineation, the wave-speed of slow shear wave V has a smallest value; the maximum and minimum wave-speeds of fast shear wave have a deviation or about 20°-30° for the lineation and foliation.
出处
《福州大学学报（自然科学版）》
CAS
CSCD
2000年第1期110-115,共6页
Journal of Fuzhou University(Natural Science Edition)
基金
国家自然科学基金!49672144
关键词
榴辉岩
波速
各向异性
组构
eclogite
wave-speed
anisotropy
fabric
Dabic mountains
