Listvenites: new insights of a hydrothermal system fossilized in Cerro Matoso peridotites, Montelíbano, Córdoba Department, Colombia

Palabras clave: Listvenita, metasomatismo, sistemas hidrotermales, Cerro Matoso, espinelas

Resumen

El producto de alteración metasomatica (e.g., carbonation) de peridotitas son listvenitas. Basados en una descripción de los afloramientos en el depósito de lateritas niquelíferas de Cerro Matoso, localizado al NW de Colombia, la composición mineralógica confirmada con XRD y análisis químicos con XRF y WDS/EDS, se redefine una unidad previamente llamada tachyilita como listvenita. Se describen dos tipos de listvenitas; listvenita A con la asociación mineralógica: cuarzo + siderita + filosilicatos + goetita +/- magnetita, y listvenita B con la asociación: siderita + filosilicatos + goetita. Relictos de Cr-espinela, acompañados por Mn-siderita y texturas neoblásticas, indican un origen a partir de peridotitas, en donde Mn-Fe serían aportados por fluidos hidrotermales. Ambientes hidrotermales reductores con fluidos alcalinos y de bajas temperaturas debieron favorecer la formación de listvenitas, que se observan a lo largo de una zona de fracturas orientada WNW-ESE en el Pit-1 de Cerro Matoso. Expuestas a condiciones climáticas quizás desde el Eoceno pero definitivamente desde la última Orogenia Andina, las listvenitas fueron afectadas al igual que todas las rocas en el depósito de Cerro Matoso por intensos procesos de meteorización y lixiviación mineral ocultando el verdadero origen de algunas.

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Cómo citar
Castrillón, A., & Guerrero, J. (2020). Listvenites: new insights of a hydrothermal system fossilized in Cerro Matoso peridotites, Montelíbano, Córdoba Department, Colombia. Boletín Geológico, (47), 67-84. https://doi.org/10.32685/0120-1425/boletingeo.47.2020.492

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Publicado
2020-12-23
Cómo citar
Castrillón, A., & Guerrero, J. (2020). Listvenites: new insights of a hydrothermal system fossilized in Cerro Matoso peridotites, Montelíbano, Córdoba Department, Colombia. Boletín Geológico, (47), 67-84. https://doi.org/10.32685/0120-1425/boletingeo.47.2020.492
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