Juha Köykkä - Oulu

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Res Terrae, Ser. A 32, J. <strong>Köykkä</strong>, Sedimentology of the Mesoproterozoic Telemark basin-fills, South Norway: implications for sedimentation processes, depositional environments and tectonic evolution the driving mechanisms and stress environments in which the sedimentary basin was created. From a genetic point of view, the sedimentary basin classification can be simply subdivided into the following: (i) extensional basins controlled by heating of the lithosphere from below and stretching and thinning of the crust, leading to rifting and thick sedimentation prisms (e.g., rifts and passive margins); (ii) pull-apart basins controlled by same mechanisms and formed in shear settings; and (iii) compressional basins, where contraction process caused crustal thickening, leading to local loads and isostatic subsidence (e.g., forelands, back-arcs, and ocean trenches). Sedimentation in a basin is generally controlled by a combination of autogenic (internal) and allogenic (external) processes. The relative importance of each mechanism depends mostly on basin configuration and proximal vs. distal settings. Autogenic processes can be studied by lithofacies analysis, but allogenic processes also require an understanding of sequence stratigraphy, geochemistry, and possible clastic petrofacies. These processes determine the distribution of depositional elements within a depositional system in a sedimentary basin (e.g., Ingersoll and Busby, 1985; Allen and Allen, 1990; Einsele, 2000; Miall, 2000). Allogenic controls on sedimentation and accommodation space in basins are controlled by the interactions of climate, tectonics and sea level changes (Fig. 8). Eustasy is mainly controlled by tectonics and climate, whereas climate is mainly controlled by global orbital forcing or possible local tectonism (e.g., formation of thrust belts). Tectonics is driven by the Earth’s internal dynamics (plume and plate tectonic processes). The sediment supply is mainly controlled by climate, tectonism, transportation, and the nature of the provenance. In Paper IV, the paleotectonic and plate-reconstruction of the studied sedimentary basin is studied by combining all of the available data. The reconstruction was based on the methods and tools described above. 48
Res Terrae, Ser. A 32, J. <strong>Köykkä</strong>, Sedimentology of the Mesoproterozoic Telemark basin-fills, South Norway: implications for sedimentation processes, depositional environments and tectonic evolution Fig. 8. Complex interplay of allogenic controls that affect to the sedimentary basin sedimentation, sediment supply, accommodation, and depositional trends and patterns (modified from Catuneanu et al., (2005). Eustasy, tectonic and climate mainly control sedimentation, whereas eustasy and tectonics are response to accommodation space. 49
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Juha Köykkä - Oulu

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