Lithospheric thickness of the Chinese continent

• Published in: Physics of the earth and planetary interiors Vol. 159; no. 3; pp. 257 - 266
• Main Authors: An, Meijian, Shi, Yaolin
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.12.2006
• Subjects: Chinese continent; Lithospheric thickness; S-velocity; Temperature; Lithospheric thickness; Temperature; S-velocity; Chinese continent
• ISSN: 0031-9201; 1872-7395
• DOI: 10.1016/j.pepi.2006.08.002

We invert for the upper-mantle temperatures of the Chinese continent in the depth range of 70–240 km from a recent S-velocity model. The depth where temperatures intersect a mantle adiabat with a potential temperature of ∼1300 °C is in close correspondence with the top of the seismic low velocity zone for most regions. This correspondence implies that seismic lithosphere estimated from short-time scale seismic information may be equivalent to the long-time scale geodynamical lithosphere. Defining the 1300 °C adiabat as coinciding with the lithospheric base, we estimate the seismic-thermal lithosphere thickness. The estimated thickness shows obvious dependence on the tectonic settings. Beneath eastern China, which mainly belongs to the circum-Pacific tectonic domain, it has a thickness of ∼100 km; and beneath the Qinghai–Tibet plateau and south to the Tarim craton, which belong to the Tethyan tectonic domain it has a thickness of ∼160–220 km. The lithospheric thicknesses of the three large para-platforms/cratons range from ∼170 km for the western Yangtze, ∼140 km for Tarim, and ∼100 km for Sino-Korean. The three cratons may have been reshaped by Phanerozoic tectonic activities and are thinner than most cratons in other continents.