Continental subduction, intracrustal shortening, and coeval upper-crustal extension: P-T evolution of subducted south Iberian paleomargin metapelites (Betics, SE Spain)

Booth‐Rea, Guillermo; Martı́nez-Martı́nez, José Miguel; Giaconia, Flavio

doi:10.1016/j.tecto.2015.08.036

Cited by 43 publications

(88 citation statements)

References 106 publications

(146 reference statements)

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“…Accurate petrological descriptions of the area can be found in previous studies (i.e. Navarro Vázquez and Velendo Muñoz, 1979;Aldaya, 1990;Jabaloy, 1993;Booth et al, 2015).…”

Section: The Lithological Successionsupporting

confidence: 70%

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The nevado-filábride complex in the western part of Sierra de los Filabres (Betic Internal Zone), structure and lithologic succession

Galdeano¹,

Garrido²

2016

Bol. geol. min.

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In the western part of Sierra de los Filabres (in the Nevado-Filábride Complex, within the Betic Internal Zone) several tectonic units have been described, in varying numbers depending on the author describing them. However, new cartographical data show that the limits of these units pass through the lithological formations without displacing them. Moreover, the rocks belonging to some units that are supposedly situated in a lower tectonic position really belong to higher formations. From bottom to top, these lithological formations are the following: (1) dark schists and quartzites; (2) quartzites, sandstones, sands, lutites, schists, and mica schists; (3) schists; (4) marbles, schists, and mica schists. High-angle reverse faults are associated with the great E-W anticline of Sierra de los Filabres. The existence of sands and apparent lutites visibly interlayered between rocks, such as schists and mica schists with garnets, poses a metamorphic problem that has not as yet been addressed.

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“…Accurate petrological descriptions of the area can be found in previous studies (i.e. Navarro Vázquez and Velendo Muñoz, 1979;Aldaya, 1990;Jabaloy, 1993;Booth et al, 2015).…”

Section: The Lithological Successionsupporting

confidence: 70%

“…These articles claim that the BedarMacael unit is located in the study area, and contains most of the marble, except for the lower layers that belong to the Calar Alto unit. This view is also shared by Augier et al (2005) and Booth et al (2015).…”

Section: General Backgroundsupporting

confidence: 68%

The nevado-filábride complex in the western part of Sierra de los Filabres (Betic Internal Zone), structure and lithologic succession

Galdeano¹,

Garrido²

2016

Bol. geol. min.

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“…However, some geoscientists exclude the NFC from the Alborán domain (e.g. Booth‐Rea et al., ), because recent work showed that the NFC and AC yielded different metamorphic ages (e.g. Kirchner et al., : <20 Ma for the NFC and c .…”

Section: Geological Settingmentioning

confidence: 99%

“…The other division includes (from bottom to the top) the Ragua (or ~Veleta), the Calar Alto (or ~lower part of Mulhacén) and the Bédar‐Macael (or ~upper part of Mulhacén) units and differences in metamorphic features (Martínez‐Martínez, Soto, & Balanyá, ) and were, thus, adopted by us (Figure ). In addition, the presence of the Dos Picos shear zone between the Ragua and the Calar Alto units makes the second division more reasonable (Augier, Booth‐Rea, et al., ; Booth‐Rea 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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Early Miocene subduction in the western Mediterranean: Constraints from Rb-Sr multimineral isochron geochronology

Kirchner

Behr

Loewy

et al. 2016

Geochem. Geophys. Geosyst.

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The Betic Cordillera of southern Spain is a complex orogen formed in the context of convergence between Africa and Iberia from the Mesozoic to the present. The internal zone of the orogen includes three tectonic complexes, two of which have been subducted to high-pressure conditions, then exhumed back to the surface during subsequent extension. Subduction in the structurally lower complex, known as the Nevado-Filabride Complex (NFC), has been a topic of debate for several years due to conflicting geochronological data. Here we use multimineral isochron 87 Rb/ 86 Sr dating on carefully selected mineral samples from high-pressure metamorphic rocks in the NFC to better constrain the timing of high-pressure metamorphism and subduction in the region. Out of five samples analyzed, statistically valid multimineral isochrons were obtained for one eclogite and two schists, yielding ages of 20.1 6 1.1, 16.0 6 0.3, and 13.3 6 1.3 Ma, respectively. Despite that the other two eclogite samples appeared to preserve prograde mineral assemblages, low 87 Rb/ 86 Sr ratios in white mica precluded precise age calculations. These new ages are in close agreement with previously published Lu-Hf ages on garnet and U-Pb ages on metamorphic zircon overgrowths for the same rocks, but are substantially younger than published data from the 40 Ar/ 39 Ar technique. Combined with recently published tomographic images of slab structure beneath the Alboran Sea, the new ages support a tectonic model in which subduction occurred both prior to the Miocene and during the early to mid-Miocene, but that it was punctuated in time by a pulse of extensional exhumation in the early Miocene associated with lithospheric delamination and/or slab tearing.

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Continental subduction, intracrustal shortening, and coeval upper-crustal extension: P-T evolution of subducted south Iberian paleomargin metapelites (Betics, SE Spain)

Cited by 43 publications

References 106 publications

The nevado-filábride complex in the western part of Sierra de los Filabres (Betic Internal Zone), structure and lithologic succession

The nevado-filábride complex in the western part of Sierra de los Filabres (Betic Internal Zone), structure and lithologic succession

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

Early Miocene subduction in the western Mediterranean: Constraints from Rb-Sr multimineral isochron geochronology

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