Thybo H, Perchuc E
H. Thybo, Geological Institute, University of Copenhagen, Oster Voldgade 10, DK-1350 Copenhagen K, Denmark. E. Perchuc, Institute of Geophysics, Polish Academy of Sciences, ul.Ksiecia Janusza 64, PL-01452 Warsaw, Poland.
Science. 1997 Mar 14;275(5306):1626-9. doi: 10.1126/science.275.5306.1626.
Strong, scattered reflections beyond 8 degrees (8degrees) offset are characteristic features of all high-resolution seismic sections from the continents. The reflections identify a low-velocity zone below approximately 100 kilometers depth beneath generally stratified mantle. This zone may be caused by partial melting, globally initiated at equal depth in the continental mantle. Solid state is again attained at the Lehmann discontinuity in cold, stable areas, whereas the zone extends to near the 400-kilometer discontinuity in hot, tectonically active areas. Thus, the depth to the Lehmann discontinuity may be an indicator of the thermal state of the continental mantle.
超过8度偏移的强烈、散射反射是来自大陆的所有高分辨率地震剖面的特征。这些反射识别出在一般分层地幔之下约100公里深度以下的低速带。该区域可能是由部分熔融引起的，在大陆地幔中以相等深度全球引发。在寒冷、稳定区域的莱曼不连续面处再次达到固态，而在炎热、构造活跃区域该区域延伸至接近400公里不连续面。因此，莱曼不连续面的深度可能是大陆地幔热状态的一个指标。
