Thermophysical properties for the major rock formations of the Western Himalaya: Implications for 2-D conductive thermal modeling
| Autor: | Sidagam, E., Ray, L., Dutta, A., Chopra, N., Podugu, N., Khan, T. |
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| Rok vydání: | 2023 |
| Zdroj: | XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) |
| DOI: | 10.57757/iugg23-1095 |
| Popis: | Thermal modeling of the lithosphere is essential to understand the geodynamics, seismogenesis, and crustal evolution of any region. Surface heat flow, radiogenic heat production, and thermal conductivity variations with temperature are the primary parameters that influence thermal modeling. The Western Himalaya is devoid of all these parameters, which hindered accurate thermal modeling of the region. In the present study, we have measured the above thermophysical properties in the laboratory for the major rock formations of the Western Himalaya along three NW-SE profiles. The major rock formations include sandstone, limestone, dolomitic limestone, slate, phyllite, quartzite, schist, gneiss, and granitoid. Thermal conductivity and heat production of these rocks vary from 2.6 to 5.4 Wm-1K-1 and 1.7 to 2.6 µWm-3. The crustal structure along one of the profiles, i.e., Tanakpur-Pangla profile (150 km length), is made using available geological and geophysical (seismological and gravity) information, along with new data on rock thermal conductivity and its variation with temperature and radiogenic heat production to obtain 2D conductive thermal structure beneath the region by finite element method. The 2D temperature-depth distribution along this profile covering Siwalik, Lesser Himalaya, and Higher Himalaya formations reveals that the temperature at Moho varies from 450 °C to 750 °C. At a few locations, subsurface temperatures estimated from the 1D conductivity models are in good agreement with that of the 2D results within the uncertainty limits. The results of 2D thermal modeling provide significant progress in understanding of the first-order characteristics of the conductive thermal field in the Western Himalaya. The 28th IUGG General Assembly (IUGG2023) (Berlin 2023) |
| Databáze: | OpenAIRE |
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