Age of the subducting Pacific slab beneath East Asia and its geodynamic implications

作者：Liu, Xin^*; Zhao, Dapeng^*; Li, Sanzhong; Wei, Wei

来源：Earth and Planetary Science Letters, 2017, 464: 166-174.

DOI：10.1016/j.epsl.2017.02.024

• the Pacific slab
• the Izanagi plate
• mantle transition zone
• lithosphere age
• slab subduction
• East Asia

We study the age of the subducting Pacific slab beneath East Asia using a high-resolution model of P-wave tomography and paleo-age data of ancient seafloor. Our results show that the lithosphere age of the subducting slab becomes younger from the Japan Trench (similar to 130Ma) to the slab's western edge (similar to 90Ma) beneath East China, and the flat (stagnant) slab in the mantle transition zone (MTZ) is the subducted Pacific plate rather than the proposed Izanagi plate which should have already collapsed into the lower mantle. The flat Pacific slab has been in the MTZ for no more than similar to 10-20 million years, considerably less than the age of the big mantle wedge beneath East Asia (>110 million years). Hence, the present flat Pacific slab in the MTZ has contributed to the Cenozoic destruction of the East Asian continental lithosphere with extensive intraplate volcanism and back-arc spreading, whereas the destruction of the North China Craton during the Early Cretaceous (similar to 140-110Ma) was caused by the subduction of the Izanagi (or the Paleo-Pacific) plate.

• 出版日期2017-4-15
• 单位中国海洋大学; 中国地震局