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70-9 Crustal structure and lithosphere thermal state in central-southern Asia
Session: From mantle to mountains: understanding interactions between deep Earth and surface processes from geologic data and modeling
Presenting Author:
Irina Artemieva
Author:
Artemieva, Irina M.1r>
(1) Zhejiang Deep-time Digital Earth International Research Center, Hangzhou, China,
Abstract:
Thermal structure of the lithosphere reflects its long-term evolution and controls its rheology, expressed in crustal and mantle anisotropic layering as observed in many seismic tomographic models globally and for Asia. Estimates of lithosphere thermal thickness, which defines lithospheric geotherms, show significant differences depending on the method and the employed lithosphere definition. While lithosphere thermal structure is often constrained by borehole heat flow values, the approach requires exclusion of tectonic provinces with non-steady-state thermal state. These requirements are not satisfied for ca. 75% of the Asian continent.
This study presents a new lithosphere thermal model for the central-southern Asia (15-50 N/70-135 E) based on an alternative approach (Artemieva, 2019a,b) and constrained by a new model of crustal thickness in Asia. The results are discussed in relation to regional geological and geodynamic evolution that shaped the region from Archean to present, including reworked and fragmented Precambrian cratons, the Paleozoic Central Asia Orogenic Belt and the Meso-Cenozoic Tethyan Belt.