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- W4250529574 abstract "The depositional framework outlined for the Falkland Islands deposits in the previous chapter is investigated in the context of the Gondwanan supercontinent. The focus in this chapter switches from trying to recognise the immediate physical processes responsible for the sedimentological variations, to seeking an explanation for the underlying mechanisms responsible for initiating the dynamic environmental setting. The sedimentology, combined with a review of the existing literature, points most convincingly towards the idea that GondwanaGondwana was host to a large subglacial lake.Lake MilankovitchMilankovitch orbitalOrbital forcing is explored as an explanation for the cyclical nature of the deposits. Firstly, the XRFXRF and reflectance data were subjected in the depth domain to spectral analysis through which prominent periodicities (in depth) could be identified. Then, by considering the data alongside a synthetic Carboniferous orbital solution,Synthetic Carboniferous orbital solution an age modelAge model and a time constraint for deposition were developed. Orbital cycles appear to be expressed in this stratigraphic record at 100 and 400 kyr periodicities, implying the transition took approximately 1.2 myr. Within the course of the transition, glaciological processes (including the build-up of an unstable ice sheetIce sheet regime following the intense and prolonged icehouse state) may also have assisted in driving the oscillations. Taking into consideration the phases of glaciationGlaciation documented across other landmasses that were also once part of Gondwana, together with the expected diachroneity of climate change across the continent, the transition in the Falkland Islands is constrained to the SakmarianSakmarian Stage of the Early Permian. Possible causes of deglaciationDeglaciation are also briefly explored in this chapter." @default.
- W4250529574 created "2022-05-12" @default.
- W4250529574 creator A5033427965 @default.
- W4250529574 date "2015-01-01" @default.
- W4250529574 modified "2023-09-30" @default.
- W4250529574 title "Discussion" @default.
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- W4250529574 doi "https://doi.org/10.1007/978-3-319-08708-5_4" @default.
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