Figure 11. Comparison between the metamorphic P-T-t evolution of the Alboran Sea basement and the P-T evolution experienced by several Alpujarride units from the western Betic Cordillera. A. Metamorphic evolution of the high-grade schist and melting conditions in the gneiss (shaded area) at Site 976 (from Soto and Platt, in press). P-T evolution of the migmatitic and pelitic gneiss are from Soto et al. (Chap. 19, this volume). Approximate cooling P-T path is shown by the broken line. Age determinations (± 2s) along the cooling path correspond to Ar/Ar mean central ages of coexisting biotite and muscovite (from Platt and Kelley, Chap. 22, this volume) and apatite fission track mean ages (from Hurford et al., Chap. 21, this volume). The estimated closure temperature of muscovite (426 ± 22°C) and biotite (330 ± 25°C) are from Platt and Kelley (Chap. 22, this volume). Temperature of the apatite partial annealing zone in these rocks (60-120°C) is from Hurford et al. (Chap. 21, this volume). B. Thermal evolution of the different Alpujarride units is from Tubía et al. (1997) for the eclogite rocks of the Ojén Unit (underlying the Ronda peridotite slab), from Sánchez-Gómez et al. (Chap. 23, this volume) for the gneissic rocks of the same unit; García-Casco and Torres-Roldán (1996) for the gneissic rocks of the Torrox Unit, and Azañón et al. (1998) for the upper levels of the Salobreña Unit. Average age determinations have been calculated with the following data sets: Zeck et al. (1992), Monié et al. (1994), Andriessen and Zeck (1996), and Sosson et al. (1998). The P-T grid is composed from Spear and Cheney (1989), Vielzeuf and Clemens (1992), granite solidi sources are summarized in Johannes and Holtz (1996), and Al-silicate triple point from Berman (1988) (for further details see Soto and Platt, in press). (1) = H2O-saturated granite solidus, (2) = Muscovite + K-feldspar + Quartz + H2O = Liquid.

Figure 11. Comparison between the metamorphic P-T-t evolution of the Alboran Sea basement and the P-T evolution experienced by several Alpujarride units from the western Betic Cordillera. A. Metamorphic evolution of the high-grade schist and melting conditions in the gneiss (shaded area) at Site 976 (from Soto and Platt, in press). P-T evolution of the migmatitic and pelitic gneiss are from Soto et al. (Chap. 19, this volume). Approximate cooling P-T path is shown by the broken line. Age determinations (± 2

) along the cooling path correspond to Ar/Ar mean central ages of coexisting biotite and muscovite (from Platt and Kelley, Chap. 22, this volume) and apatite fission track mean ages (from Hurford et al., Chap. 21, this volume). The estimated closure temperature of muscovite (426 ± 22°C) and biotite (330 ± 25°C) are from Platt and Kelley (Chap. 22, this volume). Temperature of the apatite partial annealing zone in these rocks (60-120°C) is from Hurford et al. (Chap. 21, this volume). B. Thermal evolution of the different Alpujarride units is from Tubía et al. (1997) for the eclogite rocks of the Ojén Unit (underlying the Ronda peridotite slab), from Sánchez-Gómez et al. (Chap. 23, this volume) for the gneissic rocks of the same unit; García-Casco and Torres-Roldán (1996) for the gneissic rocks of the Torrox Unit, and Azañón et al. (1998) for the upper levels of the Salobreña Unit. Average age determinations have been calculated with the following data sets: Zeck et al. (1992), Monié et al. (1994), Andriessen and Zeck (1996), and Sosson et al. (1998). The P-T grid is composed from Spear and Cheney (1989), Vielzeuf and Clemens (1992), granite solidi sources are summarized in Johannes and Holtz (1996), and Al-silicate triple point from Berman (1988) (for further details see Soto and Platt, in press). (1) = H₂O-saturated granite solidus, (2) = Muscovite + K-feldspar + Quartz + H₂O = Liquid.