Kind R, Yuan X, Saul J, Nelson D, Sobolev S V, Mechie J, Zhao W, Kosarev G, Ni J, Achauer U, Jiang M
GeoForschungsZentrum Potsdam, Telegrafenberg, 14473 Potsdam, Germany.
Science. 2002 Nov 8;298(5596):1219-21. doi: 10.1126/science.1078115.
Seismic data from central Tibet have been combined to image the subsurface structure and understand the evolution of the collision of India and Eurasia. The 410- and 660-kilometer mantle discontinuities are sharply defined, implying a lack of a subducting slab beneath the plateau. The discontinuities appear slightly deeper beneath northern Tibet, implying that the average temperature of the mantle above the transition zone is about 300 degrees C hotter in the north than in the south. There is a prominent south-dipping converter in the uppermost mantle beneath northern Tibet that might represent the top of the Eurasian mantle lithosphere underthrusting the northern margin of the plateau.
来自西藏中部的地震数据被整合起来，用于绘制地下结构图像并了解印度与欧亚大陆碰撞的演化过程。410千米和660千米的地幔间断面清晰可辨，这意味着高原下方不存在俯冲板块。间断面在藏北地区似乎略深一些，这表明过渡带上方地幔的平均温度在北部比南部高约300摄氏度。在藏北地区最上部地幔中有一个显著的向南倾斜的转换带，它可能代表了俯冲到高原北缘下方的欧亚地幔岩石圈顶部。
