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- W2913445699 abstract "The late− to post−collisional Cape Granite Suite (CGS) located in the southwest of South Africa iscomprised of S−, I−, and A−type granites, mafic intrusives, and volcanic flows. The CGS is interpretedto have formed during the closing of the Adamastor Ocean during the Late−Proterozoic toEarly−Cambrian. Recently, the S−type granites have received much attention concerning theirpetrogenesis and sources. However, the I− and A−type granites remain poorly understood and littlestudied. Therefore, with new geochemical and isotopic data the petrogenesis, sources, and tectonicsettings of I− (Vredenburg Batholith) and A−type (Cape Columbine) granites of the CGS form the focusfor this study.The major and trace element data presented in this thesis show that the granites from the VredenburgBatholith are weakly peraluminous to metaluminous, ferroan, and alkali−calcic. Associated with thegranites are metaluminous, magnesian, and calc−alkalic igneous enclaves. Formerly, the granites havebeen interpreted to have formed by fractionation. However, with new geochemical analyses and reassessmentof such models, it can be shown that such processes are incompatible with accounting forthe chemical variation displayed by the granites and their enclaves. Moreover, the I−type granites andenclaves exhibit positive linear trends between whole−rock major and trace elements vs. maficity (Fe +Mg), which can be explained by co−entrainment of peritectic and accessory phases. Thelithogeochemical characteristics of the enclaves and host granite reflect melting of a heterogeneoussource. Moreover, the granite and enclave's eNd(t) values reflect melting of Paleoproterozoic-agedcrustal sources. Finally, with tectonomagmatic discrimination diagrams, it can be shown that thetectonic setting of the granites indicates a transition from a collisional to extensional regime whichcorroborates the inferences of previous studies.The Cape Columbine Granites lithogeochemical characteristics are ferroan, calc−alkalic and weaklyperaluminous. They show typical A−type granite characteristics in having high silica content, high Na +K values, REE enrichment as compared to S− and I−type granites and strong negative Eu anomalies.For this thesis, it can be shown that anatexis of quartzofeldspathic protolith in an extensional regimeproduced the chemical variation of the Cape Columbine Granite. Moreover, their isotope ratios aretypically radiogenic, indicative of a crustal origin. With this new geochemical data evidence is providedagainst and in support of previous inferences made about the petrogenesis of the I− and A−typegranites of the CGS. This also betters our understanding of the magmatic processes involved in theconstruction of the CGS over time." @default.
- W2913445699 created "2019-02-21" @default.
- W2913445699 creator A5053915853 @default.
- W2913445699 date "2018-01-01" @default.
- W2913445699 modified "2023-09-24" @default.
- W2913445699 title "Geology, geochemistry and Sr-Nd isotope analysis of the Vredenburg batholith and Cape Columbine granites" @default.
- W2913445699 hasPublicationYear "2018" @default.
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