J. Reche

Universitat Autònoma de Barcelona

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Francisco J. Martínez

Pontificia Universidad Católica de Valparaíso

María Luisa Arboleya

Universitat Autònoma de Barcelona

Craig Dietsch

University of Cincinnati

Carmen Aguilar

Universitat de Barcelona

Alicia López-Carmona

Instituto de Geociencias

John N. Aleinikoff

Denver Federal Center

Montserrat Liesa

Universitat de Barcelona

Jordi Cirés

Institut Cartogràfic i Geològic de Catalunya

M. Riesco

Universitat Autònoma de Barcelona

Jacobo Abati

Universidad Complutense de Madrid

Cooperative Institutions

Universitat Autònoma de Barcelona

Universidad Complutense de Madrid

Universidad Nacional Autónoma de México

Universitat de Barcelona

University of Lisbon

Instituto de Geociencias

Centre National de la Recherche Scientifique

Instituto Geológico y Minero de España

Universidad de Salamanca

Universidad de Oviedo

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Silica depleted melting of pelites. Petrogenetic grid and application to the Susqueda Aureole, Spain

Journal of Metamorphic Geology (2004)

M. Riesco Kurt Stüwe J. Reche Francisco J. Martínez

Abstract Metapelitic rocks in the low pressure contact metamorphic aureole around the Susqueda igneous complex, Spain show a number of features that make them an ideal testing ground for the modelling of silica‐undersaturated melting. Rocks in the aureole experienced localized depletion in silica by the segregation of quartz veins during a pre‐anatectic, regional cordierite‐andalusite grade metamorphic event. These rocks were then intruded by gabbroic to dioritic rocks of the Susqueda igneous complex that formed a migmatitic contact metamorphic aureole in the country rocks. This migmatisation event caused quartz‐saturated hornfels and restite formation in rocks that had experienced no quartz vein segregation in the previous regional metamorphic event, but silica‐undersaturated melting in those rocks that were previously depleted in silica. Silica‐undersaturated melting is investigated using a new petrogenetic P–T projection and equilibrium pseudosections calculated in the KFMASH and NCKFMASH systems, respectively. The grid considers quartz absent equilibria and a range of phases that form typically in silica‐undersaturated bulk compositions, for example corundum. It is shown that the quartz‐rich precursors in the Susqueda contact aureole produced about 10% melt during contact metamorphism. However, most of this melt was extracted leaving behind rocks with restitic bulk compositions and minor leucosome segregation. It is suggested that the melt mixed with the host igneous rocks causing an apparent magmatic zoning from diorite in the centre of the complex to tonalite at the margins. In contrast, the quartz‐poor precursors (from which the quartz veins segregated) melted in the silica‐undersaturated field producing a range of assemblages including peritectic corundum and spinel. Melting of the silica‐undersaturated rocks produced only negligible melt and no subsequent melt loss.

Migmatite

Diorite

Cordierite

Andalusite

10.1111/j.1525-1314.2004.00527.x

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Citations (31)

Meso-Neoproterozoic basic-intermediate mafic granulites (metabasites) from the ∼1 Ga granulitic southwestern Oaxacan complex, Mexico, crustal evolution and phase equilibria modeling

Lithos (2023)

Laura Culí J. Reche Jesús Solé Fernando Ortega‐Gutiérrez

The basement of eastern Mexico is made up of Grenvillian granulite-facies metamorphic rocks, which constitute an inferred microcontinent named Oaxaquia. Proto-Oaxaquia oceanic arc reconstructions are related to the transition from Columbia to Rodinia supercontinents (~1.5 Ga). This study focuses on the petrography, geochemistry, and phase equilibria modeling of metabasites from the southwestern Oaxacan Complex, the largest Oaxaquia outcrop. Southwestern Oaxacan Complex protoliths mainly correspond to gabbro/basalt. They constitute an assemblage apart from the rest of the Oaxacan Complex metabasites due to their Ti enrichment and SiO2 depletion related to post-magmatic/metamorphic processes. Southern study site metabasites correspond to the primitive root of the arc, mostly related to a divergent geotectonic setting. The other metabasites are related to the magmatic back/forearc active margin between proto-Oaxaquia and Amazonia craton. Phase equilibria modeling point to Zapotecan (last Grenvillian cycle) metamorphic peak conditions of 850 ± 25 °C and 1.0 ± 0.15 GPa from one garnet-amphibole bearing metabasite, and a later hydration episode (post-Grenvillian) of 760 ± 10 °C and 0.8 ± 0.20 GPa derived from one amphibole bearing metabasite. The time of incipient partial melting of the southwestern Oaxacan Complex is a pre-Zapotecan event (~1 Ga). Mineral textures do not display significant processes related to the post-Zapotecan metamorphic retrogression, and only a few whole-rock light rare element patterns display strong enrichments.

Rodinia

Protolith

Continental arc

Amphibole

10.1016/j.lithos.2023.107239

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Fluid‐fluxed melting and melt loss in a syntectonic contact metamorphic aureole from the Variscan eastern Pyrenees

Journal of Metamorphic Geology (2016)

Carmen Aguilar Montserrat Liesa J. Reche Roger Powell

Abstract Open‐system behaviour through fluid influx and melt loss can produce a variety of migmatite morphologies and mineral assemblages from the same protolith composition. This is shown by different types of granulite facies migmatite from the contact aureole of the Ceret gabbro–diorite stock in the Roc de Frausa Massif (eastern Pyrenees). Patch, stromatic and schollen migmatites are identified in the inner contact aureole, whereas schollen migmatites and residual melanosomes are found as xenoliths inside the gabbro–diorite. Patch and schollen migmatites record D1 and D2 structures in folded melanosome and mostly preserve the high‐ T D2 in granular or weakly foliated leucosome. Stromatic migmatites and residual melanosomes only preserve D2. The assemblage quartz–garnet–biotite–sillimanite–cordierite±K‐feldspar–plagioclase is present in patch and schollen migmatites, whereas stromatic migmatites and residual melanosomes contain a sub‐assemblage with no sillimanite and/or K‐feldspar. A decrease in X Fe (molar Fe/(Fe + Mg)) in garnet, biotite and cordierite is observed from patch migmatites through schollen and stromatic migmatites to residual melanosomes. Whole‐rock compositions of patch, schollen and stromatic migmatites are similar to those of non‐migmatitic rocks from the surrounding area. These metasedimentary rocks are interpreted as the protoliths of the migmatites. A decrease in the silica content of migmatites from 63 to 40 wt% SiO 2 is accompanied by an increase in Al 2 O 3 and MgO+FeO and by a depletion in alkalis. Thermodynamic modelling in the NCKFMASHTO system for the different types of migmatite provides peak metamorphic conditions ~7–8 kbar and 840 °C. A nearly isothermal decompression history down to 5.5 kbar was followed by isobaric cooling from 840 °C through 690 °C to lower temperatures. The preservation of granulite facies assemblages and the variation in mineral assemblages and chemical composition can be modelled by ongoing H 2 O‐fluxed melting accompanied by melt loss. The fluids were probably released by the crystallizing gabbro–diorite, infiltrating the metasedimentary rocks and fluxing melting. Release of fluids and melt loss were probably favoured by coeval deformation (D2). The amount of melt remaining in the system varied considerably among the different types of migmatite. The whole‐rock compositions of the samples, the modelled compositions of melts at the solidus at 5.5 kbar and the residues show a good correlation.

Migmatite

Sillimanite

Diorite

Protolith

Pigeonite

10.1111/jmg.12187

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Citations (7)

Formation of corundum in metapelites around ultramafic bodies. An example from the Saualpe region, Eastern Alps

Mineralogy and Petrology (2004)

M. Riesco K. St�we J. Reche

Ultramafic rock

Corundum

10.1007/s00710-004-0062-4

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Citations (12)

U-Pb SHRIMP-RG zircon ages and Nd signature of lower Paleozoic rifting-related magmatism in the Variscan basement of the Eastern Pyrenees

Lithos (2011)

Francisco J. Martínez Alexander Iriondo Craig Dietsch John N. Aleinikoff J. J. Peucat

Massif

Basement

Geochronology

10.1016/j.lithos.2011.08.004

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Citations (41)

A Geological Heritage Itinerary Across the Andes in the Isla Grande de Tierra del Fuego

Springer geology (2021)

J. Reche Joan Poch Mercè Corbella David Gómez‐Gras Francisco J. Martínez

Outcrop

Back-arc basin

10.1007/978-3-030-60683-1_14

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Citations (2)

Exhumation of HT–LP Variscan metapelites from interlayered cordierite–orthoamphibole assemblages (MnNCFMASH System) Catalan Coastal Ranges, NE Iberia

Comptes Rendus Géoscience (2008)

J. Reche Francisco J. Martínez

Cordierite

Massif

Sillimanite

10.1016/j.crte.2007.12.008

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Citations (4)

Hercynian Metamorphism in the Catalonian Coastel Ranges

Acta geológica hispánica/Acta geologica hispanica (1990)

Ansom Sebastian J. Reche Hortensia Durán

Paleozoic rocks in the Catalonian Coastal Ranges are in their largest part affectedby alow- tovery-low grade Hercynian metamorphism. Amphibolite facies conditions are only found in restricted areas such as the southwestern part of the Guilleries massif where upper amphibolite facies conditions are reached. Metamorphic grade increases from top to bottom of the Paleozoic stratigraphic sequence and the metamorphic peak is diachronous, being progressively older in the lower grade metamorphic zones. The isograd pattern, mineral assemblages, mineral chemistry and preserved reaction textures are consistent with a low pressure metamorphism possibly evolving from a previous Barrovian type event. The metamorphic climax in the high grade zone was reached after the seconddeformational phase. Calculatedpeak P-Tconditions are 620-640 OC and around 3.5 Kb . A latter episode of decompression from the maximum conditions to 1-2 Kb, with an associated temperature decrease to 530-550 OC, is recognized. The intrusion of late Hercynian granitoids produced contact metamorphic aureoles where the pyroxene-hornfels facies is locally reached.

Diachronous

Isograd

Massif

Hornfels

Pyroxene

Source

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Citations (9)

Variscan Metamorphism

Regional geology reviews (2019)

Luísa Ribeiro J. Reche Alicia López-Carmona Carmen Aguilar Telmo Bento dos Santos

Orogeny

10.1007/978-3-030-10519-8_12

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Citations (10)

Retrograde replacement of andalusite by Ca–Na mica in chloritoid‐bearing metapelites. PTX modelling of rocks with different Al content in the MnNCKFMASH system

Journal of Metamorphic Geology (2004)

Francisco J. Martínez J. Reche María Luisa Arboleya Manuel Julivert

Abstract Andalusite porphyroblasts are totally pseudomorphosed by margarite–paragonite aggregates in aluminous pelites containing the peak mineral assemblage andalusite, chlorite, chloritoid, margarite, paragonite, quartz ± garnet, in a NW Iberia contact area. Equilibria at low P–T are investigated using new KFMASH and (mainly) MnCNKFMASH grids constructed with Thermocalc 3.21. P–T and T–X pseudosections with phase modal volume isopleths are constructed for compositions relatively richer and poorer in andalusite to model the assemblages in an andalusite‐bearing rock that contains a thin andalusite‐rich band (ARB) during retrogression. Their compositions, prior to retrogression, are used in the modelling, and have been retrieved by restoring the pseudomorph‐forming elements into the current‐depleted matrix, except for Al 2 O 3 which is assumed to be immobile. Compositional differences between the thin band and the rest of the rock have not resulted in differences in andalusite porphyroblast retrogression. The absence of chloritoid resorbtion implies either a pressure increase at constant reacting‐system composition, or that its composition changed during retrogression at constant pressure, by becoming enriched in the progressively replaced andalusite porphyroblasts. T–X pseudosections at 1 kbar model this latter process using as end‐members in X , first, the restored original rock and ARB compositions, and, then the same process, taking into account the change in composition of both as retrogression proceeded. The MnNCKFMASH pseudosections of rocks with different Al contents facilitate making further deductions on the rock‐composition control of the resulting assemblages upon retrogression. Andalusite eventually disappears in relatively Al‐poor rocks, resulting, as in this study, in a rock formed by chloritoid–chlorite as the only FM minerals, plus margarite–paragonite pseudomorphs of andalusite. In rocks richer in Al, chlorite would progressively disappear and a kyanite/andalusite–chloritoid assemblage would eventually be stable at retrograde conditions. The Al‐silicate, stable during retrogression in Al‐rich rocks, indicates pressure conditions and hence the tectonic context under which retrogression took place.

Andalusite

Pelite

Pseudomorph

Sillimanite

10.1111/j.1525-1314.2004.00549.x

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Citations (11)