Petrology, metallogeny and U-Pb geochronology of the paleoproterozoic mafic-ultramafic Hamutenha intrusion, Angolan Shield

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Title: Petrology, metallogeny and U-Pb geochronology of the paleoproterozoic mafic-ultramafic Hamutenha intrusion, Angolan Shield
Authors: Consorci del Museu de Ciències Naturals de Barcelona
Campeny, Marc
Proenza, Joaquín A.
Castillo-Oliver, Montgarrí
Torró, Lisard
Villanova-de-Benavent, Cristina
Melgarejo, Joan Carles
Gonçalves, Antonio O.
Román-Alpiste, Manuel J.
Blanco-Quintero,
Issue Date: 13-Oct-2023
Keywords: Roques plutòniques
Geocronologia
Spatial coverage: Angola
Sud-àfrica
Access to document: http://hdl.handle.net/2072/527554
Extent: 59 p.
Abstract: The Hamutenha intrusion (Huíla province, SW Angola) is a 3-km-long elongated magmatic body defined by a set of two intrusive units. The northern unit is formed by alternating bands of dunites and olivine gabbros, while the southern unit is composed of amphibole diorites. The Hamutenha body is hosted by the Paleoproterozoic Epupa Complex in the Angolan Shield, SW margin of the Congo Craton. A mineralogical, petrological and geochemical study of the Hamutenha intrusion has been performed. The constrained compositional features of the parental melt suggest interaction of tholeiitic magmas with a significant enrichment in Fe and Ti. Although disseminated Fe–Ni–Cu-(Co) secondary sulphides are observed, both the crustal contamination parameters and generally low bulk-rock metals contents indicate that these elements were most likely previously extracted from the parental melt. U–Pb zircon dating of amphibole diorite samples from the southern unit yields a date of 1844 ± 14 Ma. These data suggest that the emplacement of these rocks was previous to the KC emplacement and it was probably related to the Paleoproterozoic Epupa Complex magmatism.
Terms of use: CC-BY-NC-ND
Appears in Collections:Mineralogia / Articles

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