Repository logo
 
Publication

Recording the largest gabbro-anorthositic complex worldwide: The Kunene Complex (KC), SW Angola

2022-09Journal article Open access
Simple item page
dc.contributor.authorRey-Moral, Carmen
dc.contributor.authorMochales, Tania
dc.contributor.authorMartinez, Enrique Merino
dc.contributor.authorLobón, Jose Luis Garcia
dc.contributor.authorBahut, María Teresa López
dc.contributor.authorMartín-Banda, Raquel
dc.contributor.authorFeria, María Carmen
dc.contributor.authorBallesteros, Dianne
dc.contributor.authorMachadinho, Ana
dc.contributor.authorAlves, Daniela
dc.date.accessioned2022-12-02T11:36:19Z
dc.date.available2022-12-02T11:36:19Z
dc.date.issued2022-09
dc.description.abstractABSTRACT: The Kunene Complex (KC) represents a large Mesoproterozoic igneous body, mainly composed of anorthosites and gabbroic rocks that extends from SW Angola to NW Namibia (18000 km2, N-S trend, and ca. 350 km long and 25???50 km wide). Although the KC has been studied from a cartographic and geochemical point of view, little is known about its structure at depth below the sedimentary deposits of the Kalahari basin. Hence, we use available satellite gravity data to estimate its extent and to unravel its morphology at depth. The Bouguer anomaly map depicts a gravity gradient from the coast (+200 mGal) towards eastern Angola (-150 mGal), which is explained by the transition from a young, dense and thin basaltic oceanic crust, formed during the Mesozoic Atlantic rifting, to an old, light and thick Archaean to Proterozoic continental crust (Congo Craton), to the east. The outcropping KC interrupts the gravity trend, showing at the western, southwestern and northeastern sides, several positive and isolated gravity anomalies linked to gabbroic intrusions associated to KC (ca. 50 km wavelength and -90 mGal). In contrast, the anomalies found at the central part of the massif (50 km wavelength and < -110 mGal) correspond to the dominant anorthositic members, according to the spatial correlation of the mapping. Five 2.5D gravity profiles have been modelled to investigate the unexposed eastern boundary, reconstructing the surface crustal structure (between 0 and 15 km depth) overlaid by the thin sedimentary cover of the Kalahari basin. The gravity modelling helps us to show that the KC was emplaced in the Upper Crust and extends in depth up to ca. 6 km, showing a lobular geometry and following a large NE-SW to NNE-SSW linear trend, presumably inherited from older Palaeoproterozoic structures. The lateral continuation of the KC to the east (between 50 and 125 km) beneath the Kalahari sediments suggests an overall size of at least twice the outcropping dimension (about 42500 km2). This statement clearly influences in the economic potential of this massif, related to the prospecting of raw materials and certain types of economic mineralization (Fe-Ti oxides, metallic sulphides or platinum group minerals).pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.citationRey-Moral, Carmen... [et.al.] - Recording the largest gabbro-anorthositic complex worldwide: The Kunene Complex (KC), SW Angola. In: Precambrian Research, 2022, vol. 379, article nº 106790pt_PT
dc.identifier.doi10.1016/j.precamres.2022.106790pt_PT
dc.identifier.issn0301-9268
dc.identifier.urihttp://hdl.handle.net/10400.9/3969
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherElsevierpt_PT
dc.relationPLANAGEO project (Plan de Cartografía Geol´ogica, Geofísica y Geoquímica de Angola, IGME-LNEG-IMPULSO Consortium)pt_PT
dc.relationGeosciences Center
dc.relation.publisherversionhttps://doi.org/10.1016/j.precamres.2022.106790pt_PT
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/pt_PT
dc.subjectGravity modellingpt_PT
dc.subjectMesoproterozoic igneouspt_PT
dc.subjectKunene complexpt_PT
dc.subjectAngola (Southwest)pt_PT
dc.titleRecording the largest gabbro-anorthositic complex worldwide: The Kunene Complex (KC), SW Angolapt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.awardTitleGeosciences Center
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/UIDB%2F00073%2F2020/PT
oaire.citation.titlePrecambrian Researchpt_PT
oaire.citation.volume379pt_PT
oaire.fundingStream6817 - DCRRNI ID
person.familyNameMachadinho
person.givenNameAna
person.identifier.ciencia-idFF17-D4F9-4315
person.identifier.orcid0000-0003-1323-217X
person.identifier.scopus-author-id56638554400
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.nameFundação para a Ciência e a Tecnologia
rcaap.rightsopenAccesspt_PT
rcaap.typearticlept_PT
relation.isAuthorOfPublication6361ac1f-6e95-47cb-acb5-38ceff71784c
relation.isAuthorOfPublication.latestForDiscovery6361ac1f-6e95-47cb-acb5-38ceff71784c
relation.isProjectOfPublication757a5d95-9598-49c4-8d66-4486f17e45cd
relation.isProjectOfPublication.latestForDiscovery757a5d95-9598-49c4-8d66-4486f17e45cd

Files

Original bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
PrecambrianResearch_vol.379_106790.pdf
Size:
12.24 MB
Format:
Adobe Portable Document Format
Download
License bundle
Now showing 1 - 1 of 1
No Thumbnail Available
Name:
license.txt
Size:
1.71 KB
Format:
Item-specific license agreed upon to submission
Description:
Download

Collections

GCG - Artigos em revistas internacionais