António Olímpio Gonçalves

Agostinho Neto University

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Joan Carles Melgarejo i Draper

Universitat de Barcelona

Octávio Mateus

Universidade Nova de Lisboa

Michael J. Polcyn

Southern Methodist University

Louis L. Jacobs

Southern Methodist University

Marc Campeny

Natural Science Museum of Barcelona

Anne S. Schulp

Naturalis Biodiversity Center

María Pura Alfonso Abella

Universitat Politècnica de Catalunya

José Mánuel

Agostinho Neto University

Maria Luísa Morais

Agostinho Neto University

Alessandra Costanzo

Ollscoil na Gaillimhe – University of Galway

Cooperative Institutions

Universitat de Barcelona

Agostinho Neto University

Southern Methodist University

Universidade Estadual Paulista (Unesp)

Macquarie University

Australian Research Council

ARC Centre of Excellence for Core to Crust Fluid Systems

Museu da Lourinhã

Universidade Nova de Lisboa

Instituto de Geociencias

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Sequence of crystallisation of pegmatites: the Angola case

Estudos Geológicos (2009)

António Olímpio Gonçalves Joan-Carles Melgarejo i Draper María Pura Alfonso Abella

The Precambrian basement of Angola contains several pegmatite fi elds, although most of them have not been studied yet. Some of them include pegmatites devoid of rare elements, as those found close to Caxito, about 100 km ENE Luanda. These pegmatites are exploited for the production of industrial minerals. Moreover, some rare element pegmatite fi elds occur close to Namibe, in the desertic part of the southwest of the country. These pegmatites were prospected for Be and Ta in the 1960’s. The distribution of the pegmatite types, as well as the exceptional quality of the outcrops, due to lack of weathering or soil cover, allow a complete sampling in order to study the evolution of a pegmatite fi eld, from parental granites to barren pegmatites, beryl-columbite-phosphate pegmatites and spodumene pegmatites. Furthermore, the internal evolution of each pegmatite type has been also studied.

Pegmatite

Spodumene

Outcrop

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Citations (3)

The Fossil Record of Biodiversity in Angola Through Time: A Paleontological Perspective

Springer eBooks (2019)

Octávio Mateus Pedro M. Callapez Michael J. Polcyn Anne S. Schulp António Olímpio Gonçalves

Fossil Record

Geologic record

Geologic time scale

10.1007/978-3-030-03083-4_4

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Citations (5)

The cranial anatomy and relationships of Cardiocorax mukulu (Plesiosauria: Elasmosauridae) from Bentiaba, Angola

PLoS ONE (2021)

Miguel Marx Octávio Mateus Michael J. Polcyn Anne S. Schulp António Olímpio Gonçalves

We report a new specimen of the plesiosaur Cardiocorax mukulu that includes the most complete plesiosaur skull from sub-Saharan Africa. The well-preserved three-dimensional nature of the skull offers rare insight into the cranial anatomy of elasmosaurid plesiosaurians. The new specimen of Cardiocorax mukulu was recovered from Bentiaba, Namibe Province in Angola, approximately three meters above the holotype. The new specimen also includes an atlas-axis complex, seventeen postaxial cervical vertebrae, partial ribs, a femur, and limb elements. It is identified as Cardiocorax mukulu based on an apomorphy shared with the holotype where the cervical neural spine is approximately as long anteroposteriorly as the centrum and exhibits a sinusoidal anterior margin. The new specimen is nearly identical to the holotype and previously referred material in all other aspects. Cardiocorax mukulu is returned in an early-branching or intermediate position in Elasmosauridae in four out of the six of our phylogenetic analyses. Cardiocorax mukulu lacks the elongated cervical vertebrae that is characteristic of the extremely long-necked elasmosaurines, and the broad skull with and a high number of maxillary teeth (28–40) which is characteristic of Aristonectinae. Currently, the most parsimonious explanation concerning elasmosaurid evolutionary relationships, is that Cardiocorax mukulu represents an older lineage of elasmosaurids in the Maastrichtian.

Osteology

10.1371/journal.pone.0255773

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Citations (8)

Ti-V oxide deposits in the Kunene anorthositic complex (SW Angola)

C. Villanova Salvador Galí Lisard Torró M. Castillo Marc Campeny

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Zonación del Pirocloro Primario en Carbonatitas de Angola

Macla: revista de la Sociedad Española de Mineralogía (2009)

Cosimo Bambi Joan Carles Melgarejo i Draper António Olímpio Gonçalves María Pura Alfonso Abella Alessandra Costanzo

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Carbon isotope stratigraphy, magnetostratigraphy, and 40Ar/39Ar age of the Cretaceous South Atlantic coast, Namibe Basin, Angola

Journal of African Earth Sciences (2014)

C. Strganac Johanna Salminen Louis L. Jacobs Michael J. Polcyn Kurt M. Ferguson

We present the δ13C and paleomagnetic stratigraphy for marine strata at the coast of southern Angola, anchored by an intercalated basalt with a whole rock 40Ar/39Ar radiometric age of 84.6 ± 1.5 Ma, being consistent with both invertebrate and vertebrate biostratigraphy. This is the first African stable carbon isotope record correlated to significant events in the global carbon record spanning the Late Cenomanian to Early Maastrichtian. A positive ∼3‰ excursion seen in bivalve shells below the basalt indicates the Cenomanian–Turonian Boundary Event at 93.9 Ma, during Oceanic Anoxic Event 2. Additional excursions above the basalt are correlated to patterns globally, including a negative ∼3‰ excursion near the top of the section interpreted as part of the Campanian–Maastrichtian Boundary Events. The age of the basalt ties the studied Bentiaba section to a pulse of Late Cretaceous magmatic activity around the South Atlantic and significant tectonic activity, including rotation, of the African continent.

Cenomanian

Magnetostratigraphy

Chemostratigraphy

Geochronology

Excursion

10.1016/j.jafrearsci.2014.03.003

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Citations (35)

Nb and REE Distribution in the Monte Verde Carbonatite–Alkaline–Agpaitic Complex (Angola)

Minerals (2019)

Sandra Amores-Casals António Olímpio Gonçalves Joan Carles Melgarejo i Draper Joan Martı́

The Angolan alkaline–carbonatite complex of Monte Verde has a semi-circular shape and is comprised of a central intrusion of foidolite rocks surrounded by concentrically arranged minor bodies of other alkaline rocks and carbonatite magmatic breccias. This rock association is hosted by fenitized Eburnean granites. Concentric swarms of alkaline dykes of late formation, mostly of nepheline trachyte composition, crosscut the previous units. Most high-field strength elements (HFSE) and rare earth elements (REE) are concentrated in pyrochlore crystals in the carbonatite and alkaline breccias. Magmatic fluornatropyrochlore is replaced and overgrown by five secondary generations of pyrochlore formed during subsolidus stages and have higher Th, REE, Si, U, Sr, Ba, Zr, and Ti contents. The second, third, and fourth pyrochlore generations are associated with late fluids also producing quartz and REE rich minerals; whereas fifth and sixth pyrochlore generations are linked to the fenitization process. On the other hand, minerals of the rinkite, rosenbuschite, wöhlerite, eudialyte groups, as well as loparite-(Ce), occur in accessory amounts in nepheline trachyte, recording low to moderate agpaicity. In addition, minor REE-bearing carbonates, silicates, and phosphates crystallize as late minor secondary minerals into carbonatite breccia and alkaline dykes. In conclusion, the scarcity of HFSE and REE minerals at the Monte Verde carbonatite-alkaline-agpaitic complex suggests low metallogenetic interest and economic potential for the outcrops analysed in this study. However, the potential for buried resources should not be neglected.

Carbonatite

Nepheline

Nepheline syenite

Breccia

Trachyte

Cape verde

Peralkaline rock

10.3390/min10010005

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Citations (11)

A New Kaolin Deposit in Western Africa: Mineralogical and Compositional Features of Kaolinite from Caluquembe (Angola)

Clays and Clay Minerals (2019)