Preliminary Ar-Ar geochronology of Mesozoic alkaline-carbonatitic to tholeiitic magmatism in the Quilengues area, SW Angola

Enrique Merino-Martínez; Pablo Valverde-Vaquero; Aratz Beranoaguirre; Gustavo Galán; Janet Gabites; José Manuel

doi:10.21701/bolgeomin/136.1/009

Autores/as

Enrique Merino-Martínez Departamento de Geología y Subsuelo, Centro Nacional Instituto Geológico y Minero de España (IGME-CSIC) https://orcid.org/0000-0002-2032-6353
Pablo Valverde-Vaquero Departamento de Geología y Subsuelo, Centro Nacional Instituto Geológico y Minero de España (IGME-CSIC) https://orcid.org/0000-0002-2184-0848
Aratz Beranoaguirre UTE-PLANAGEO (IGME/LNEG/Impulso). Department of Geosciences, Goethe-University Frankfurt https://orcid.org/0000-0002-1137-6498
Gustavo Galán UTE-PLANAGEO (IGME/LNEG/Impulso)
Janet Gabites Pacific Center for Isotopic and Geochemical Research, The University of British Columbia https://orcid.org/0000-0003-3698-3275
José Manuel Instituto Geologico de Angola (IGEO) https://orcid.org/0000-0001-5509-5068

DOI:

https://doi.org/10.21701/bolgeomin/136.1/009

Palabras clave:

Geocronología Ar-Ar, Magmas alcalino-carbonatíticos, Magmatismo bimodal, Mesozoico, Angola

Resumen

Nuevos datos geocronológicos han sido obtenidos en unidades kimberlíticas relacionadas con el macizo carbonatítico de Bonga y en diques basálticos de la región de Quilengues, en el suroeste de Angola, en el marco del Plan Nacional de Geología de Angola (PLANAGEO). Las dataciones Ar-Ar en separados minerales (flogopita, anfíbol) indican distintos pulsos de intrusión para los magmas alcalino-carbonatíticos del Complejo de Bonga (155,2 ± 2,9 Ma) y el conjunto de diques en dirección NNE-SSO (124,7 ± 2,2 Ma). Estas edades concuerdan con aquellas reportadas en materiales volcánicos de la franja litoral, sugiriendo una relación directa con procesos de desestabilización litosférica inducido por el ascenso de fundidos profundos en etapas incipientes a progresivas del rifting Atlántico y la ruptura de Pangea. Los diques basálticos, por tanto, podrían representar canales de alimentación de fundidos mantélicos que extruyeron en forma de Grandes Provincias Ígneas (LIPs), los cuales conforman la Provincia de Paraná-Angola-Etendeka. Las relaciones espacio-temporales de los cuerpos estudiados están de acuerdo con la intrusión de fundidos mantélicos asociados a estadios incipientes del rifting, en direcciones equivalentes a la estructura de Lucapa y del margen Atlántico. Las nuevas edades refuerzan el conjunto de datos existentes sobre la edad de los pulsos alcalinos-carbonatíticos y bimodales (alcalinos a toleíticos) del Jurásico-Cretácico en Angola y en regiones equivalentes de Sudamérica. También se sugiere un control estructural, con el emplazamiento de los pulsos alcalinos más tardíos en direcciones ~E-O, en relación al progreso del rifting y a la acción de fallas transformantes profundas durante la ruptura continental.

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