Ocurrencia de rocas metapelíticas con presencia de cloritoide y su significado en el metamorfismo de la Formación Silgará en la región central del Macizo de Santander

We report here for the first time the occurrence of chloritoid in Mg-Al-rich metapelitic rocks of the Silgar Formation at the Central Santander Massif, which was metamorphosed up to the amphibolite facies. These rocks contain an unusual mineral assemblage such as quartz + biotite + muscovite + garne...

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Bibliographic Details
Published inBoletiín de ciencias de la tierra no. 40; p. 5
Main Authors Castellanos-Alarcón, Oscar Mauricio, Ríos-Reyes, Carlos Alberto, García-Ramírez, Carlos Alberto
Format Journal Article
LanguageSpanish
Published Bogota Universidad Nacional de Colombia 01.07.2016
Subjects
Geochemistry
Metamorphic rocks
Colombia
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Summary:We report here for the first time the occurrence of chloritoid in Mg-Al-rich metapelitic rocks of the Silgar Formation at the Central Santander Massif, which was metamorphosed up to the amphibolite facies. These rocks contain an unusual mineral assemblage such as quartz + biotite + muscovite + garnet + staurolite kyanite chloritoid, with minor plagioclase and K-feldspar, and Fe-Ti oxides as the main accessory phases. Associated carbonate rocks containing the mineral assemblage tremolite + calcite. Chloritoid occurs as porphyroblastic tablets in graphite-bearing metapelitic schists highly tectonized that can be associated to the influence of the major tectonic structures in the study area. The occurrence of chloritoid as an index mineral in metapelitic rocks of the Silgar Formation is attributed to a thermal event (associated to the emplacement of small granitic masses) overimposed on the regional metamorphism.
ISSN:0120-3630
2357-3740