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Petrology and geochemistry of meta-ultramafic rocks in the Paleozoic Granjeno Schist, northeastern Mexico: Remnants of Pangaea ocean floor

dc.contributor.authorTorres Sánchez, Sonia Alejandra
dc.contributor.authorAugustsson, Carita
dc.contributor.authorJenchen, Uwe
dc.contributor.authorBarboza Gudiño, Rafael J.
dc.contributor.authorAlemán Gallardo, Eduardo
dc.contributor.authorRamírez Fernández, Juan Alonso
dc.contributor.authorTorres Sánchez, Darío
dc.contributor.authorAbratis, Michael
dc.date.accessioned2018-08-20T20:19:17Z
dc.date.available2018-08-20T20:19:17Z
dc.date.issued2017-01
dc.identifier.citationTorres-Sánchez, S., Augustsson, C., Jenchen, U., et al. (2017). Petrology and geochemistry of meta-ultramafic rocks in the Paleozoic Granjeno Schist, northeastern Mexico: Remnants of Pangaea ocean floor. Open Geosciences, 9(1), pp. 361-384. Retrieved 20 Aug. 2018, from doi:10.1515/geo-2017-0029es_MX
dc.identifier.urihttp://hdl.handle.net/11627/4072
dc.description.abstract"The Granjeno Schist is a meta-volcanosedimentary upper Paleozoic complex in northeastern Mexico. We suggest different tectonic settings for metamorphism of its serpentinite and talc-bearing rocks based on petrographic and geochemical compositions. According to the REE ratios (LaN/YbN = 0.51 –20.0 and LaN/SmN = 0.72–9.1) and the enrichment in the highly incompatible elements Cs (0.1 ppm), U (2.8 ppm), and Zr (60 ppm) as well as depletion in Ba (1 – 15 ppm), Sr (1 –184 ppm), Pb (0.1 –14 ppm), and Ce (0.1 –1.9 ppm) the rocks have mid-ocean ridge and subduction zones characteristics. The serpentinite contains Al-chromite, ferrian chromite and magnetite. The Al-chromite is characterized by Cr# of 0.48 to 0.55 suggesting a MORB origin, and Cr# of 0.93 to 1.00 for the ferrian chromite indicates a prograde metamorphism. We propose at least two serpentinization stages of lithospheric mantle for the ultramafic rock of the Granjeno Schist, (1) a first in an ocean-floor environment at sub-greenschist to greenschist facies conditions and (2) later a serpentinization phase related to the progressive replacement of spinel by ferrian chromite and magnetite at greenschist to low amphibolite facies conditions during regional metamorphism. The second serpentinization phase took place in an active continental margin during the Pennsylvanian. We propose that the origin of the ultramafic rocks is related to an obduction and accretional event at the western margin of Pangea."es_MX
dc.language.isoenges_MX
dc.rightsAttribution-NonCommercial-NoDerivatives 4.0 Internacional*
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/*
dc.subjectUltramafic rockses_MX
dc.subjectSerpentinitees_MX
dc.subjectGranjeno Schistes_MX
dc.subjectNortheastern Mexicoes_MX
dc.subjectGondwanaes_MX
dc.subjectPangeaes_MX
dc.subject.classificationArea::CIENCIAS FÍSICO MATEMÁTICAS Y CIENCIAS DE LA TIERRA::CIENCIAS DE LA TIERRA Y DEL ESPACIO::GEOLOGÍAes_MX
dc.titlePetrology and geochemistry of meta-ultramafic rocks in the Paleozoic Granjeno Schist, northeastern Mexico: Remnants of Pangaea ocean floores_MX
dc.typearticlees_MX
dc.identifier.doihttps://doi.org/10.1515/geo-2017-0029


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Attribution-NonCommercial-NoDerivatives 4.0 Internacional
Except where otherwise noted, this item's license is described as Attribution-NonCommercial-NoDerivatives 4.0 Internacional