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The thermal state and strength of the lithosphere in the Spanish Central System and Tajo Basin from crustal heat production and thermal isostasy

Jiménez Díaz, Alberto and Ruiz Pérez, Javier and Villaseca González, Carlos and Tejero López, Rosa María and Capote del Villar, Ramón (2012) The thermal state and strength of the lithosphere in the Spanish Central System and Tajo Basin from crustal heat production and thermal isostasy. Journal of Geodynamics, 58 . pp. 29-37. ISSN 0264-3707

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Abstract

In this work we have modeled the thermal structure of the lithosphere of the Spanish Central System
and the Tajo Basin, and their implications for lithospheric strength. For this, we have used refined heatproducing
elements (HPE) values to obtain new estimates of heat production rates in the Spanish Central
System and Tajo Basin areas, which have been used joined to the relation between topography and
thermal structure of the lithosphere to calculate the best-fit surface heat flows in the study area. Moreover,
we have implemented a temperature-dependent thermal conductivity (appropriate for olivine) for the
lithospheric mantle to improve the calculations of temperature profiles in the mantle. The geotherms so
obtained, together with the implementation of a new rheological law for the upper lithospheric mantle,
have been used to calculate refined estimations of the strength and effective elastic thickness of the
lithosphere. We have obtained surface heat flow values of 84 mW m−2 and
∼82 mW m−2 for the Spanish
Central System and the Tajo Basin, respectively. The thermal state of the lithosphere affects mantle
temperatures, and hence may be playing an important role in the uplift and maintenance of the Spanish
Central System.


Item Type:Article
Uncontrolled Keywords:Heat flow; Thermal structure; Strength envelopes; Rheology; Continental lithosphere; Iberian Peninsula
Subjects:Sciences > Physics > Thermodynamics
Sciences > Geology > Geodynamics
ID Code:17110
Deposited On:15 Nov 2012 11:54
Last Modified:15 Nov 2012 11:54

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