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Showing 1 to 9 of 9 for “"Etendeka"”.
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Karoo-Etendeka Unconformities in NW Namibia and their Tectonic Implications
In north-western Namibia the fills of the Karoo-Etendeka depositories can be subdivided into (1) a Carboniferous-Permian, (2) a Triassic-Jurassic and (3) a Cretaceous megasequence, each recording extensional periods related to successive rifting phases in the evolving South Atlantic. The tectonic …
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The geology and geochemistry of the Etendeka Formation quartz latites, Namibia
The Etendeka Formation volcanics of north-western Namibia form part of the Karoo Igneous Province of southern Africa and consist of a series of basalts interbedded with quartz latites and minor volumes of latite. This thesis examines various aspects of the geology and geochemistry of the quartz …
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Stable isotope geochemistry of the Okenyenya igneous complex, Namibia : constraints on contamination and fluid interaction
… the oxygen isotope composition of the southern Etendeka rhyolite (δ¹⁸O = + 11.5‰). It is suggested that the assimilant may have been derived from the same source as the southern Etendeka rhyolite, as opposed to the rhyolite itself, which would be expected to occur at a high crustal level. Simple …
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Magmatism in southern Uruguay and the early rifting of the South Atlantic
… lies at the southern margin of the Parana - Etendeka continental flood basalt province. New Ar- Ar ages of the basalts range from 134 to 130 Ma while ages from the rhyolites range from 130 to 124 Ma. This magamtism was contemporaneous with the main flood basalt event, although rhyolite …
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Geochemistry of dolerites from the Parana flood basalt province, southern Brazil
The Cretaceous Parana-Etendeka flood basalt magmatism of South America and " Africa was accompanied by intense intrusive activity. This study examines the geochemistry and petrogenesis of dykes from two regions of southern Brazil. Dykes from the Ponta Grossa region of Parana. State fed the basalt …
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Carbonatites as a record of the carbon isotope composition of large igneous province outgassing
… related to the Deccan Traps and the Paraná-Etendeka. We find no evidence for magmas with carbon isotope ratios lighter than depleted mantle values of δ<sup>13</sup>C =−6±2‰ from any of these LIPs, though some carbonatites range to heavier δ<sup>13</sup>C ratios. We attribute relatively heavy …
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Detektion eines mesozoischen Gangschwarmes in NW Namibia und Rekonstruktion regionaler Spannungszustände während der Südatlantiköffnung
… weisen die Gänge als erodierte Förderkanäle der Etendeka Plateaubasalte aus. Durch den Einsatz von hochauflösenden Aeromagnetik- und Satellitendaten war es möglich, die Geometrie des Gangschwarmes erstmals detailliert synoptisch zu erfassen. Viele zu den Schichten des Grundgebirges …
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The hydrocarbon potential of the deep offshore along the Argentine volcanic rifted margin : a numerical simulation
… of the South Atlantic. Since 135Ma, the Paraná/Etendeka continental flood basalts were emplaced, associated with seaward dipping reflector sequences (SDRS), possibly caused by the Tristan da Cunha hot spot. After break-up, thermal subsidence affected predominantly the development of the rifted …
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Geochemistry of the Sabie River Basalt Formation in the central Lebombo, Karoo Igneous Province
… Gondwanaland (e.g. Kirwanveggan of Antarctica, Etendeka of Namibia and the Parana Basin of South America). It is suggested that there is a geographical association of LFE-type basalts with Archaean crust (or Archaean crust re-worked in low temperature - high pressure events) and N-type basalts …