Petrology and Thermobarometric Estimates For Metasediments, Orthogneisses, and Eclogites From the Nevado-Filábride Complex In the Western Sierra Nevada (Betic Cordillera, Spain)

Ruiz-Cruz, M. D.; Galdeano, Carlos Sanz de; Santamaría, Ángel

doi:10.3749/canmin.1500037

Cited by 15 publications

(14 citation statements)

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“…Since the Bédar‐Macael and Calar Alto units are treated as one unit (Mulhacén nappe) by some authors, we compare our results for the Calar Alto unit with the P–T conditions for the Mulhacén nappe in general. The here constrained peak‐ P conditions of 17.4 ± 1.2 kbar at 526 ± 17°C are close to previous results of ~18–19 kbar at ~550°C (Ruiz‐Cruz et al., ), ~16 kbar/450–500°C (Booth‐Rea et al., ), 14.4 ± 2.8 kbar at 651 ± 117°C (Gómez‐Pugnaire et al., ) and ~19 kbar at 570–590°C (Jabaloy‐Sánchez et al., ) for metapelites in the Bédar‐Macael and Calar Alto units (Figure c). However, the P–T data estimated by Ruiz‐Cruz et al.…”

Section: Discussionsupporting

confidence: 91%

“…(b) Previously determined P–T paths for metasedimentary rocks of the Ragua unit (Aerden et al., ; Augier, Agard, et al., ). (c) Previously reported P–T paths for metasedimentary rocks from the Bédar‐Macael and Calar Alto units (Aerden et al., ; Augier, Agard, et al., ; Bakker et al., ; Booth‐Rea et al., ; Gómez‐Pugnaire et al., ; Jabaloy‐Sánchez et al., ; Ruiz‐Cruz et al., )…”

Section: Discussionmentioning

confidence: 99%

“…However, the P–T data estimated by Ruiz‐Cruz et al. () resulted from their modelling of garnet growth at H 2 O‐absent conditions (see their figure , for example, garnet+kyanite at 300°C at >15 kbar). We think that such conditions would not lead to garnet porphyroblasts, but to very small irregularly zoned garnet around decomposing minerals such as plagioclase and biotite at HP conditions as reported, for instance, by Compagnoni and Rolfo () and Rubbo, Borghi, and Compagnoni ().…”

Section: Discussionmentioning

confidence: 99%

“…The HP metamorphism in the Calar Alto and Bédar‐Macael units developed at eclogite facies conditions of 15–25 kbar and 500–750°C for ultrabasic and basic rocks (Augier, Agard, et al., ; Jabaloy‐Sánchez et al., ; López Sánchez‐Vizcaíno et al., ; Platt et al., ; Puga, Nieto, Díaz de Federico, Bodinier, & Morten, ; Puga et al., ; Ruiz‐Cruz et al., ), and at 10–20 kbar and 450–590°C for metapelites (Augier, Agard, et al., ; Bakker, de Jong, Helmers, & Biermann, ; Booth‐Rea et al., ; Ruiz‐Cruz et al., ), or higher temperatures of 651 ± 117°C at 14.1 ± 2.8 kbar (Gómez‐Pugnaire et al., ). The distinct peak‐ P conditions of different rock types were explained by their juxtaposition after peak metamorphism (Jabaloy‐Sánchez et al., ).…”

Section: Geological Settingmentioning

confidence: 99%

“…The NFC is characterized by HP metabasites (Bodinier, Morten, Puga, & Díaz de Federico, ; Gómez‐Pugnaire & Fernández Soler, ; Gómez‐Pugnaire, Visona, & Franz, ; Morten, Bargossi, Martínez‐Martínez, Puga, & Díaz de Federico, ; Puga, Nieto, & Díaz de Federico, ; Ruiz‐Cruz, Sanz de Galdeano, & Santamaría, ), metasediments (Augier, Booth‐Rea, et al., ; Augier, Jolivet, & Robin, ; Booth‐Rea, Martínez‐Martínez, & Giaconia, ; Gómez‐Pugnaire & Franz, ; Ruiz‐Cruz et al., ) and orthogneisses (Gómez‐Pugnaire et al., ; Ruiz‐Cruz et al., ). The timing of HP metamorphism in the NFC is still currently debated, due to conflicting geochronological data using different methods.…”

Section: Introductionmentioning

confidence: 99%

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Two Tertiary metamorphic events recognized in high‐pressure metapelites of the Nevado‐Filábride Complex (Betic Cordillera, S Spain)

Massonne

2018

Journal Metamorphic Geology

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Two phengite–garnet‐bearing metapelites from the Nevado‐Filábride Complex, Betic Cordillera, one from the Ragua unit (sample 23085) and the other (sample 23098) from the Calar Alto unit, were studied in detail to elucidate their metamorphic evolution. We calculated various P–T pseudosections for different O2 and H2O‐CO2 contents and Fe3+/Fe2+ ratios with PERPLE_X . On the basis of the compositions of the garnet core and the highest Si content in potassic white mica, different peak pressures of 12.7 ± 0.7 kbar at 525 ± 10°C (23085) and 17.4 ± 1.2 kbar at 526 ± 17°C (23098) resulted (errors refer to an estimated 1σ range). The suggested clockwise P–T loop was followed in both cases by another loop caused by a reheating process. On the basis of garnet rim compositions, peak temperatures of 596 ± 10°C at 10.7 ± 1.4 kbar (23085) and 629 ± 11°C at 8.5 ± 0.7 kbar (23098) resulted, supported by Zr‐in‐rutile thermometry (23085: 591 ± 11°C; 23098: 607 ± 10°C). In situ dating of monazite (23085) with the electron microprobe yielded ages between c. 48 and 14 Ma. On the basis of the monazite composition and histogram analysis, two age populations with mean ages of 40.2 ± 1.7 (1σ) and 24.1 ± 0.8 Ma could be defined. Low Y2O3 contents (<0.6 wt%) in monazite point to its formation after initial growth of garnet. The older generation was therefore assigned to the formation of the garnet core and the early P–T loop. The younger monazite population was related to the late P–T loop. A geodynamic scenario is hypothesized that assigns the Eocene metamorphism to subduction of a continental margin to depths of 50–65 km, followed by exhumation in an exhumation channel accompanied by mixing of slices of different rock types including mantle rocks. This process ended with stacking of such slices causing reheating of the studied rocks in the Early Miocene. The noted time gap of c. 15 Ma between subduction and nappe stacking is similar to the continent–continent collisional orogeny of the Himalaya.

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Section: Discussionsupporting

confidence: 91%