Page 48 - Geothermal Energy Systems Exploration, Development, and Utilization

24 1 Reservoir Definition

Initial Moho depth = 35 km
Initial Moho temperature = 550 °C
Time, t = 67 Ma, Dx = 211 km 0.3 cm yr −1

550 °C

1000 °C
1200 °C
(a)
Time, t = 41 Ma, Dx = 135 km 0.3 cm yr −1

550 °C

1000 °C

1200 °C
(b)
Time, t = 1.3 Ma, Dx = 110 km 30 cm yr −1

550 °C

1000 °C
1200 °C
(c)
Figure 1.12 Uplifted isotherms (thick grey Case of no strain softening, after 211 km of
line) created by lithospheric extension, af- extension; (b) asymmetric extension obtained
ter Huismans and Beaumont, 2002. Crust with the introduction of strain softening and
and lithosphere are rheologically stratified. 41 Myr after rifting initiation; and (c) case of
Lateral boundary conditions reproducing ex- a fast rifting velocity, involving a large zone
tension correspond to the imposed rifting (∼40 km) of hot middle crust.
velocities given in centimeters per year. (a)