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- W2101003583 abstract "Koegel Fontein is a 30 km diameter anorogenic igneous complex that intruded Namaqualand gneisses during the initial phase of break-up of Africa and South America. It is notable for the presence of quartz porphyry dykes that formed from low-δ 18 O magmas. Many of the igneous rocks show petrographic evidence for alteration and have had their δ 18 O values lowered by fluid-rock interaction at high temperatures. Partial melting and/or assimilation of this material produced the low- δ 18 O magmas. Whole-rock δD and δ 18 O values indicate equilibrium with meteoritc water with a δ 18 O value around -10 ‰, which is abnormally negative given the relatively low latitude at the time of intrusion. A combination of an elevated volcanic edifice and the ‘continental effect’ is the most likely explanation." @default.
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- W2101003583 date "2009-01-01" @default.
- W2101003583 modified "2023-09-25" @default.
- W2101003583 title "O- and H-isotope Study of the Cretaceous Koegel Fontein Complex" @default.
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- W2101003583 doi "https://doi.org/10.3997/2214-4609-pdb.241.curtis_paper" @default.
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