Recording the largest gabbro-anorthositic complex worldwide: The Kunene Complex (KC), SW Angola
Autor(a) principal: | |
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Data de Publicação: | 2022 |
Outros Autores: | , , , , , , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
Texto Completo: | http://hdl.handle.net/10400.9/3969 |
Resumo: | ABSTRACT: 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). |
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Recording the largest gabbro-anorthositic complex worldwide: The Kunene Complex (KC), SW AngolaGravity modellingMesoproterozoic igneousKunene complexAngola (Southwest)ABSTRACT: 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).ElsevierRepositório do LNEGRey-Moral, CarmenMochales, TaniaMartinez, Enrique MerinoLobón, Jose Luis GarciaBahut, María Teresa LópezMartín-Banda, RaquelFeria, María CarmenBallesteros, DianneMachadinho, AnaAlves, Daniela2022-12-02T11:36:19Z2022-092022-09-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/10400.9/3969engRey-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 1067900301-926810.1016/j.precamres.2022.106790info:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2022-12-04T04:45:16Zoai:repositorio.lneg.pt:10400.9/3969Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T16:15:26.887820Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse |
dc.title.none.fl_str_mv |
Recording the largest gabbro-anorthositic complex worldwide: The Kunene Complex (KC), SW Angola |
title |
Recording the largest gabbro-anorthositic complex worldwide: The Kunene Complex (KC), SW Angola |
spellingShingle |
Recording the largest gabbro-anorthositic complex worldwide: The Kunene Complex (KC), SW Angola Rey-Moral, Carmen Gravity modelling Mesoproterozoic igneous Kunene complex Angola (Southwest) |
title_short |
Recording the largest gabbro-anorthositic complex worldwide: The Kunene Complex (KC), SW Angola |
title_full |
Recording the largest gabbro-anorthositic complex worldwide: The Kunene Complex (KC), SW Angola |
title_fullStr |
Recording the largest gabbro-anorthositic complex worldwide: The Kunene Complex (KC), SW Angola |
title_full_unstemmed |
Recording the largest gabbro-anorthositic complex worldwide: The Kunene Complex (KC), SW Angola |
title_sort |
Recording the largest gabbro-anorthositic complex worldwide: The Kunene Complex (KC), SW Angola |
author |
Rey-Moral, Carmen |
author_facet |
Rey-Moral, Carmen Mochales, Tania Martinez, Enrique Merino Lobón, Jose Luis Garcia Bahut, María Teresa López Martín-Banda, Raquel Feria, María Carmen Ballesteros, Dianne Machadinho, Ana Alves, Daniela |
author_role |
author |
author2 |
Mochales, Tania Martinez, Enrique Merino Lobón, Jose Luis Garcia Bahut, María Teresa López Martín-Banda, Raquel Feria, María Carmen Ballesteros, Dianne Machadinho, Ana Alves, Daniela |
author2_role |
author author author author author author author author author |
dc.contributor.none.fl_str_mv |
Repositório do LNEG |
dc.contributor.author.fl_str_mv |
Rey-Moral, Carmen Mochales, Tania Martinez, Enrique Merino Lobón, Jose Luis Garcia Bahut, María Teresa López Martín-Banda, Raquel Feria, María Carmen Ballesteros, Dianne Machadinho, Ana Alves, Daniela |
dc.subject.por.fl_str_mv |
Gravity modelling Mesoproterozoic igneous Kunene complex Angola (Southwest) |
topic |
Gravity modelling Mesoproterozoic igneous Kunene complex Angola (Southwest) |
description |
ABSTRACT: 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). |
publishDate |
2022 |
dc.date.none.fl_str_mv |
2022-12-02T11:36:19Z 2022-09 2022-09-01T00:00:00Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://hdl.handle.net/10400.9/3969 |
url |
http://hdl.handle.net/10400.9/3969 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Rey-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 106790 0301-9268 10.1016/j.precamres.2022.106790 |
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info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf |
dc.publisher.none.fl_str_mv |
Elsevier |
publisher.none.fl_str_mv |
Elsevier |
dc.source.none.fl_str_mv |
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Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
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Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
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Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
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Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
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