Sequential development of the metamorphic aureole beneath the Ronda peridotites and its bearing on the tectonic evolution of the Betic Cordillera

Tubía, José María; Cuevas, Julia; Ibarguchi, JoséI.Gil

doi:10.1016/s0040-1951(97)00124-8

Cited by 101 publications

(131 citation statements)

References 61 publications

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“…the Ronda peridotites ;Lundeen 1978;Obata 1980;Van der Wal and Vissers 1996;Garrido et al 2011;Précigout et al 2013). Thus, in the vicinity of the Ronda peridotites, crustal rocks show systematically the highest metamorphic grade and extensive melting (Loomis 1972;Torres-Roldán 1981Balanyá et al 1997;Tubía et al 1997Tubía et al , 2013Argles et al 1999;Acosta-Vigil et al 2001, 2014Platt et al 2003;Esteban et al 2008;Barich et al 2014). This contribution focuses on MI in Grt of mylonitic, former high P granulitic metasedimentary migmatites from the Jubrique Alpujárride unit.…”

Section: Geological Settingmentioning

confidence: 98%

The composition of nanogranitoids in migmatites overlying the Ronda peridotites (Betic Cordillera, S Spain): the anatectic history of a polymetamorphic basement

Acosta-Vigil

Barich

Bartoli

et al. 2016

Contrib Mineral Petrol

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The study of the composition of primary melts during anatexis of high-pressure granulitic migmatites is relevant to understand the generation and differentiation of continental crust.Peritectic minerals in migmatites can trap dropless of melt that forms via incongruent melting reactions during crustal anatexis. These melt inclusions commonly crystallize and form nanogranitoids upon slow cooling of the anatectic terrane. To obtain the primary compositions of crustal melts recorded in these nanogranitoids, including volatile concentrations and information on fluid regimes, they must be remelted and rehomogenize before analysis. A new occurrence of nanogranitoids was recently reported in garnets of mylonitic metapelitic gneisses (former high pressure granulitic migmatites) at the bottom of the prograde metamorphic sequence of Jubrique, located on top of the Ronda peridotite slab (Betic Cordillera, S Spain). Nanogranitoids within separated chips of cores and rims of large garnets from these former migmatites were remelted at 15 kbar and 850, 825 or 800 ºC and dry (without added H 2 O), during 24 hours, using a piston cylinder apparatus. Although all experiments show glass (former melt) within melt inclusions, the extent of rehomogenization depends on the experimental temperature. Experiments at 850-825 ºC show abundant disequilibrium microstructures, whereas those at 800 ºC show a relatively high proportion of rehomogenized nanogranitoids, indicating that anatexis and entrapment of melt inclusions in these rocks was likely close to 800 ºC. Electron microprobe and NanoSIMS analyses show that experimental glasses are leucogranitoid and peraluminous, though define two distinct compositional groups. Type I corresponds to K-rich, Ca-and H 2 O-poor leucogranitic melts, whereas type II represents K-poor, Ca-and H 2 O-rich granodioritic to tonalitic melts. Type I and II melt inclusions are found in most cases at the cores and rims of large garnets, respectively. We tentatively suggest that these former migmatites underwent two melting events under contrasting fluid regimes, possibly during two different orogenic periods. This 3 study demonstrates the strong potential of melt inclusions studies in migmatites and granulites in order to unravel their anatectic history, particularly in strongly deformed rocks where most of the classical anatectic microstructures have been erased during deformation.

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Section: Geological Settingmentioning

confidence: 98%

The composition of nanogranitoids in migmatites overlying the Ronda peridotites (Betic Cordillera, S Spain): the anatectic history of a polymetamorphic basement

Acosta-Vigil

Barich

Bartoli

et al. 2016

Contrib Mineral Petrol

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“…Nevertheless, this overthrust cannot be deduced from the geologic map Piles Mateos et al, 1978a). This thrusting is real in other places, for instance in the northeast of Sierra Alpujata (to the east of the study area), where the peridotites locally overthrust the Blanca unit (Tubía et al, 1997) and in the Sierra de las Nieves, where the peridotites spectacularly overthrust Mesozoic rocks, in this case of the Dorsal Complex Martín Algarra, 2011 and.…”

Section: Introductionmentioning

confidence: 83%

“…Thus, previous works arguing for the exhumation of the peridotites in early Miocene, reflecting extensional collapse, include: Loomis (1975), Lundeen (1978), and Priem et al (1979), which are based mainly on K/Ar dating of rocks from the metamorphic aureole around the peridotites; the works of Doblas & Oyarzun (1989), Van der Wal & Vissers (1993), Vissers et al (1995), Tubía (1985Tubía ( , 1994, Tubía & Cuevas (1986, Tubía et al (1997;, Balanyá et al, (1993Balanyá et al, ( , 1997, Davies et al (1993), Sánchez Gómez et al (1995, Platt et al, 2003, Esteban et al (2011, Afiri et al (2011), and Garrido et al (2011), which used tectonic and petrological criteria derived from the study of peridotites and/or crustal rocks; the works of Zindler et al (1983) and Reisberg et al (1989), based on Sr and Nd isotopic data of clinopyroxenes; and works of Platt & Whitehouse (1999) and Sanchez-Rodriguez & Gebauer (2000), based on zircon dating of migmatitic rocks. Précigout et al (2013) deduced that the Ronda peridotites were emplaced during the OligoceneMiocene just before 22 Ma.…”

Section: Introductionmentioning

confidence: 99%

Late Palaeozoic to Triassic formations unconformably deposited over the Ronda peridotites (Betic Cordilleras): Evidence for their Variscan time of crustal emplacement

Galdeano

Cruz

2016

Estud. geol.

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“…It is a slice of mantle that was uplifted during Alpine orogeny [Sánchez-Rodríguez and Gebauer, 2000]. The massif is now in tectonic contact with continental metamorphic series of the Betic Cordilleras that dominantly comprise metapelitic rocks (gneisses and schists) and marbles of Paleozoic to Triassic ages (see precise descriptions of these lithologies in Tubía et al [1986Tubía et al [ , 1992Tubía et al [ , 1997). …”

Section: The Ronda Peridotite : Petrographical Featuresmentioning

confidence: 99%

“…These pyroxenites contain up to 80 % of pyroxenes, mostly clinopyroxenes, with some plagioclase, olivine and spinel. The peridotite is also locally cross cut by very rare and late granitic intrusions which formed during the latest stages of uplift of the peridotites [Tubía et al, 1997]. All these subordinate lithologies, scattered within the whole peridotite, represent less than 5 % of the Ronda massif.…”

Section: Fig 1 -A-geological Map (Aftermentioning

confidence: 99%

Cartography of the Ronda peridotite (Spain) by hyperspectral remote sensing

Launeau¹,

Sotin²,

Girardeau³

2002

Bulletin De La Société Géologique De France

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Abstract. -The Ronda Peridotite, south of Andalusia (Spain), was imaged by AVIRIS in 1991 and partially sampled by us in the field with a GER 3700 spectrometer in 1997 in order to get experience in processing hyperpectral images of planetary surfaces with probes such as ISM Phobos (1989), OMEGA Mars Express (2003) and VIMS Cassini (2004). The high spectral resolution of the images (224 channels from 400 to 2455 nm) is necessary to conduct geological analysis with remote petrological determinations of rock types. On Earth, it is also necessary to determine species of vegetation because of their strong influence in mapping lithology, even in dry areas like the Ronda peridotite.The Ronda AVIRIS image was first processed to infer geological features using photo-interpretation of colour composite images extracted from 150 useful channels compared to geological maps and checked on the field during the campaign of July 97. This allows us to distinguish easily the peridotite massif from its surrounding rocks and its own serpentine zoning.Since this work followed the work of Chabrillat et al. [2000] we chose to explore the AVIRIS data with other techniques. We chose to remove the contribution of the atmosphere with spectra collected in the field on a white target at various altitudes and to remove the main vegetation with spectra of the most characteristic vegetation of the peridotite. In both cases we first estimated the amount of atmosphere and vegetation with band ratios and remove them with two similar empiric corrections of the reflectance.From the spectroscopy data, after removal of the atmosphere and some vegetation signal, we were able to clearly distinguish the crustal rocks from the mantle ones, as well as compositional variations due to pyroxene and mostly serpentine abundance within the peridotites. Hyperspectral infrared spectrometry will provide good geological mapping of the main rocks on planetary surfaces, if images can also be calibrated with in situ field measurements which will not miss any unexpected component. However, some ambiguities remain between certain types of rock which have close mineralogical composition (e.g. harzburgite compared to lherzolite) or which have resulting spectra very similar to each other (plagioclase and lizardite in peridotites). Some other ambiguities between spectra are also introduced by techniques of analysis based on relative reflectance. By not taking into account absolute intensity of the reflectance, because of roughness and topographic shading effects, small mineral variations are not always visible. Cartographie de la péridotite de Ronda (Espagne) par télédétection hyperspectrale : données AVIRISMots clés. -Ronda, Péridotite, Pétrographie, Hyperspectral, SAM, AVIRISRésumé. -La péridotite de Ronda, au sud de l'Andalousie (Espagne), a été imagée par AVIRIS en 1991 et partiellement échantillonnée par nous-même sur le terrain à l'aide d'un spectromètre GER 3700 en 1997 dans le but d'acquérir une expérience dans le traitement des images hyperspectrales des surfaces ...

show abstract

Sequential development of the metamorphic aureole beneath the Ronda peridotites and its bearing on the tectonic evolution of the Betic Cordillera

Cited by 101 publications

References 61 publications

The composition of nanogranitoids in migmatites overlying the Ronda peridotites (Betic Cordillera, S Spain): the anatectic history of a polymetamorphic basement

The composition of nanogranitoids in migmatites overlying the Ronda peridotites (Betic Cordillera, S Spain): the anatectic history of a polymetamorphic basement

Late Palaeozoic to Triassic formations unconformably deposited over the Ronda peridotites (Betic Cordilleras): Evidence for their Variscan time of crustal emplacement

Cartography of the Ronda peridotite (Spain) by hyperspectral remote sensing

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