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• W2112412430 abstract "GEOTHERMS,STRENGTH OF THE LlTHOSPHERE AND ZONES OF PARTIAL MELTING Steady state continental geotherms where temperature-pressure dependence of conductivity has been considered are presented in Fig. 1 for surface heat tlow of 65, 70 and 80 mWm'2. These geotherms are useful for comparison with the evolution of the thermal equilibration of the lithosphere resulting from models and - in conjuction with these models- for discussing other geophysical observations. The geotherms are calculated by an iteration algorithm that follows the variations of conductivity and heat generation in the crust and upper mantle. Conductivity at ambient conditions ofupper crustal rocks is taken to be 3.0-3.3 Wm-loC - 1; for the lower crust a value of 2.6 Wm·loC -1 is used. ln Fig. 1, for geotherms 1,3 and 4, the temperature dependence of thermal conductivity in the crust follows the results of Zoth & Haenel (1988) as described by Seipold (1998), and for geotherm 2 the results obtained by Sass et al. (1992) are used. The pressure dependence of conductivity in the crust is taken from Chapman & Furlong (1992). In the upper mantle, thermal and pressure effects on conductivity are also taken into account , following a model based on phonon lifetimes from infrared reflectivity (Hofmeister , 1999). In 1,2 and 4, the conductivity at 20-30 km depth is 2.2-2.0 Wm-loC - l , and 2 .5-2 .3 Wm-loC- 1 in geotherm 3; the conductivity decreases from these values to about 1.5 Wm-loC - 1 at the crust/mantle boundary . ln the mantle lithosphere, the conducti vity results in values of about 2.9-3.0 Wm-IoC - 1. Radiogenic heat generation (A) in a layered crust for geotherms l, 2 and 4 is taken to be 1.0-1.5 , 0.6-0 .8 and 0.4-0 .5 !-t Wm') for the upper, middle and lower crust, respectively; in geotherm 3, a first layer with a step variation in A giving a weighted value of 1.3 ~lWm') and a rnafic lower crustal layer 8 km thick with A= 0.2 !-tWm') have been assumed. At a depth of 20 km, temperature ranges from about 420 C to 550 · C; at 30 km depth, it ranges from about 580 C to 750 C, and at the crust/mantle boundary (CMB) it can reach values from about 1050 C to 1200 oc. The radiogenic heat generation in the upper mantle is taken to be 0.02 !-tWm-), and the thermal boundary layer at 1250 C is reached at 90- 130 km depth in geotherms l, 2, and 4 and at 85 km depth in" @default.
• W2112412430 created "2016-06-24" @default.
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• W2112412430 date "2005-01-01" @default.
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• W2112412430 title "Approaches to the relatively hot Altiplano plateau" @default.
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