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- W2127145395 abstract "Detailed mapping, structural analysis and high precision UPb zircon ages from hypabyssal porphyries and tonalites has enabled the timing of the major collisional episode of the Barberton greenstone belt to be determined. This episode, known as the D2 deformation, can be divided into D2-early and D2-late. D2-early deformation, bracketed as having occurred between 3229 and 3227 Ma, was typified by isoclinal folding (F2 of shales and associated cherts (Fig Tree Group), but not of the overlying quartzose clastic rocks (Moodies Group). D2-late deformation was at 3226 Ma, or later, with large F3 open-tight folds dominating the map pattern in the Weltevreden study area. Late D2 faults, such as the Moodies Fault, that define the boundaries of the major structural domains converge near the Saddleback Fault, a major boundary within the Barberton greenstone belt. Strain calculations suggest that plane strain was dominant, with at least 60% shortening occurring during the D2 deformational events. Although an early and a late stage of D2 deformation can be distinguished in the field, precise UPb zircon ages indicate that these events represent a continuum, ranging from the onset of an arc-arc assembly event (D2-early), through to major collisional and post-amalgamation events (D2-late), all of which spanned ∼3 million years. La cartographie détailĺee, l'analyse structurale et la datation de haute précision UPb sur zircon dans les porphyres subvolcaniques et les tonalites a permis de déterminer la durée de l'épisode majeur de collision dans la ceinture des roches vertes de Barberton. Cetépisode, connu sous le nom de déformation D2, peut se subdiviser en D2-précoce et D2-tardif. La déformation D2-précoce, dont la fourchette d'aˆges se situe entre 3229 et 3227 Ma, est caractérisée typiquement par le plissement isoclinal F2 des shales et des cherts associés du Groupe de Fig Tree, et non des roches clastiques quartzeuses susjacentes du Groupe de Moodies. La déformation D2-tardive s'est produite il y a 3226 Ma, ou plus tard, avec de grands plis ouvertsàfermés F3 responsables de la structure générale visible sur la carte de la zone d'étude de Weltevreden. Les failles D2-tardives, comme la Faille de Moodies, définissent les limites des grands domaines structuraux et convergent près de la Faille de Saddleback, limite majeureàl'intérieur de la ceinture de roches vertes de Barberton. Le calcul des déformations suggère une déformation plane dominante, avec au moins 60% de raccourcissement durant lesépisodes de déformation D2. Bien que l'on puisse distinguer sur le terrain un stage precoce et un stage tardif de la deformation D2, lesaˆges précis UPb sur zircon indiquent que cesévénements représentent un continuumàpartir du début de l'assemblage arc-arc (D2-précoce) jusqu'àla collision majeure et le stage post-collage (D2-tardif), le tout durant environ 3 millions d'années." @default.
- W2127145395 created "2016-06-24" @default.
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- W2127145395 date "2000-02-01" @default.
- W2127145395 modified "2023-10-04" @default.
- W2127145395 title "An Arch˦an arc-arc collisional event: a short-lived (ca 3 Myr) episode, Weltevreden area, Barberton greenstone belt, South Africa" @default.
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