论文部分内容阅读
对人工地震测深及天然地震面波体波三维层折反演数据进行统一处理，建立了中国及其邻区地球三维结构初始模型．此模型图像表明，中国及其邻区地球各圈层横向变化明显．岩石圈及软流圈内速度分布主要反映这一区域自古生代以来板块及地块拼合模式．各主要板块或地块（塔里木、扬子、中朝、青藏、哈萨克斯坦、印度、印度支那）岩石圈增厚或有很深的地慢根，板块或地块间的造山带岩石圈减薄，软流圈速度降低。下地幔底部及核幔边界D″层出现高速异常，表明古太平洋及古特提斯洋俯冲板块因重力坍塌已进入地球深层，形成亚洲超级下降地幔柱。这一下降地幔柱引起地球表层物质向中亚、东亚地区集中，印度半岛、青藏高原、新疆、蒙古至贝加尔一带，成为全球岩石圈最大的汇聚场所．
The seismic data from artificial seismic sounding and natural seismic plane wave three-dimensional stratification are unified, and the initial model of Earth’s three-dimensional structure in China and its adjacent areas is established. This model image shows that the horizontal variation of all the earth’s rings in China and its neighboring regions is significant. The distribution of velocities in the lithosphere and asthenosphere mainly reflects the pattern of plate and plot combination since the Paleozoic in this area. The lithosphere is thickened or deeply rooted in all major blocks or plots (Tarim, Yangtze, China, North Korea, Qinghai-Tibet, Kazakhstan, India and Indo-China), orogeny lithosphere thinning between plates and parcels, Asthenospheric velocity decreases. The high-velocity anomaly at the bottom of the lower mantle and the D-mantle boundary indicates that the subducted slabs of the ancient Pacific and the ancient Tethys Ocean have entered the Earth’s deep due to gravity collapse, forming the super-plunging mantle plume in Asia. Central Asia, East Asia concentrated, the Indian Peninsula, Qinghai-Tibet Plateau, Xinjiang, Mongolia to Baikal area, become the largest gathering place of the world’s lithosphere.