 | | Journal (article/letter/editorial) | | diversity in Cretaceous anorogenic granites from Namibia and implications for A-type granite genesis R.B...complexes in the Damaraland of west – central Namibia are silicic in composition. Although all have trace...from the five largest silicic complexes (Paresis, Erongo, Brandberg, Cape Cross, Gross Spitzkoppe) that...involved, and their relative proportions. The Paresis complex has an isotopic signature (d18O= + 9x , eNd130...O isotope variations reported from the mafic Okenyenya and Messum complexes, and from rhyodacites in |  | | Journal (article/letter/editorial) | | Pan‑African lithospheric mantle beneath the Damara Belt, Namibia, by the Tristan mantle plume: geochemical evidence...mantle and variably enriched mantle beneath this region. Clinopyroxenes showing geochemical depletion have...continental breakup. Keywords Mantle · Northwest Namibia · Trace elements · Isotopes · Amphibole · Metasomatism...mantle convection and thus having preserved a complex record of its initial melt depletion and subsequent...process include amphibole, phlogopite, apatite, zircon and clinopyroxene. The role of mantle metasomatism |  | | Journal (article/letter/editorial) | | felsic magmatism in the Cretaceous Paresis ring complex, Namibia: evidence for mixing of crust and mantle-derived...the farthest inland of any felsic complex in the Cretaceous ring complex group. The other ring complexes...the Congo craton and related inliers in northern Namibia. The comendites are peralkaline, highly differentiated...All rights reserved. Keywords: Damaraland; Ring complex; Syenites; Comendites; Radiogenic isotopes; Magma...ŽPeate, 1997.. The Damaraland Igneous Province in Namibia is a well-exposed and preserved group of some 20 |  | CURTIS, C. G., TRUMBULL, R. B., DE BEER, C. H., HARRIS, C., REID, D. L., ROMER, R. L. (2011) GEOCHEMISTRY OF THE EARLY CRETACEOUS KOEGEL FONTEIN ANOROGENIC IGNEOUS COMPLEX, SOUTH AFRICA. South African Journal of Geology, 114 (3) 353-378 doi:10.2113/gssajg.114.3-4.353 | Journal (article/letter/editorial) | | EARLY CRETACEOUS KOEGEL FONTEIN ANOROGENIC IGNEOUS COMPLEX, SOUTH AFRICA C.G. CURTIS Department of Geological...South Africa ABSTRACT The Koegel Fontein Igneous Complex in the Western Cape Province of South Africa is...first geochemical study of the Koegel Fontein Complex. Two groups of mafic units are distinguished based...along the continental margin occur in and near the complex. These regional dolerites are much more homogeneous...magmas makes up the bulk of the Koegel Fontein complex, with the large Rietpoort granite pluton and quartz-porphyry |  | | Journal (article/letter/editorial) | | Gross Spitzkoppe topaz granite, central western Namibia: a geochemical and Nd–Sr–Pb isotope study Stephen...igneous complexes that formed in the Damaraland of Namibia during an episode of continental rifting and magmatism...of the GSS yield an age for emplacement of the complex at 125 F 1 Ma. Initial 87Sr/86Sr ratios vary from...melting is by basaltic underplating of the source region in the lower crust. The range in initial Nd and...2004 Elsevier B.V. All rights reserved. Keywords: Namibia; Anorogenic; A-type granite; Lower crust; Radiogenic |  | | Journal (article/letter/editorial) | | small-fraction melt generation occurred beneath the region in two phases; at 145 Ma and 127.5 Ma, i.e. before...Columbia River provinces, which alludes to the complex interaction of lithospheric and asthenospheric...Uruguay and Brazil) and eastern part (Damaraland, Namibia) [4,26,28–31]. These range from 134 to 127.5 Ma...intrusive complexes from Damaraland (north-west Namibia, Fig. 2). Contact relations indicate that, on the... flow [46]. Furthermore, the Paresis alkaline complex postdates the eruption of the Etendeka flood basalts |  | Cernuschi, F., Dilles, J.H., Kent, A.J.R., Schroer, G., Raab, A.K., Conti, B., Muzio, R. (2015) Geology, geochemistry and geochronology of the Cretaceous Lascano East intrusive complex and magmatic evolution of the Laguna Merín basin, Uruguay. Gondwana Research, 28 (2) 837-857 doi:10.1016/j.gr.2014.07.007 | Journal (article/letter/editorial) | | geochronology of the Cretaceous Lascano East intrusive complex and magmatic evolution of the Laguna Merı́n basin...geochronology of the Cretaceous Lascano East intrusive complex and magmatic evolution of the Laguna Merı́n basin...the Cretaceous Lascano East intrusive RI P T complex and magmatic evolution of the Laguna Merín basin...alkaline compositions are well-exposed and studied in Namibia on the African margin. Ring complexes CE are...basalts and the sub-alkaline to alkaline ring complex centers within the evolving rifted continental |  | | Journal (article/letter/editorial) | | Damaraland Lamprophyres and Carbonatites, Northwestern Namibia: Evidence for Plume–Lithosphere Interactions ANTON...igneous complexes in Damaraland, northwestern Namibia. Lamprophyres, emplaced as late-stage dykes, stocks...WORDS: geochemistry; lamprophyre carbonatite; Namibia; Tristan plume ∗Corresponding author. Telephone:+27-21-650-2921...complexes extend through Damaraland in northwestern Namibia (Fig. 1) and provide an example of the contiguous... 1. Simplified geological map of northwestern Namibia, showing the main outcrop regions of the Etendeka |  | | Journal (issue) | | island. The eontribution of Birkenmajer deseribes a region not very familiar in literature. He gives a review...transmission of seismic energy through the tectonically complex overlying section (Fig. 3). 239 100 km Basel...ofIvrea (crossed ruling); CRL = Cremosina line complex, bounding the Ivrea-Ceneri body (narrow horizontal...Helvetic nappes and the External Massifs is similarly complex, yet did not produce a comparable effect, and that...Scientific Party, 1991; Buness, 1992). The border region of the Po plain is problematic. Here, excellent |  | | Journal (article/letter/editorial) | | of the Alkaline Core of the Messum Igneous Complex, Namibia: Evidence for the Progressively Decreasing...3 GEOLOGICAL SURVEY, P.O. BOX 2168, WINDHOEK, NAMIBIA RECEIVED NOVEMBER 12, 1998; REVISED TYPESCRIPT...TYPESCRIPT ACCEPTED APRIL 12, 1999 The Messum complex of NW Namibia, a part of the Paraná– Etendeka volcanic...INTRODUCTION Paraná–Etendeka volcanism; Messum complex; alkaline core; crustal contamination; Tristan...Etendeka Igneous province in the Damaraland region of northwest Namibia (Fig. 1) contains numerous anorogenic |  | | Book | | simplest way to visualize the chemical composition of complex silicate materials is as a mixture of oxides: silicon...NaAlSi3O8). Solid solution in pyroxenes is more complex, so representing the composition of a pyroxene...be ignored. Garnet compositions are still more complex and require six end-members (Box 5.2). Such ‘formula... see Fig. 1.5); the dashed lines delineate the region of overlap between alkali and subalkali basalts... The circumstances behind this transition are complex. The field evidence may be summarized as follows: |
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