Precambrian alluvial fan and braidplain sedimentation patterns: Example from the Mesoproterozoic Rjukan Rift Basin, southern Norway

The sedimentation and paleohydrology of the Mesoproterozoic stream deposits in a strike–slip basin (Svinsaga Formation), Telemark, southern Norway

“…Similar fining-and thinning-upward sheet-like successions of clast-supported conglomerates in association with pebbly horizontal to low-angle cross-stratified sandstones have been noted in other alluvial deposits (e.g., Martins-Neto, 1984;Köykkä, 2011). Each sheet records a single depositional/aggradational flooding event, where a waning-flood cycle begins with a clast-supported conglomerates followed by low-angle cross-bedded and pebbly sandstone.…”

“…11) with studies from ancient alluvial fan deposits (e.g. Köykkä, 2011), indicates that paleohydrological investigations are important in interpreting ancient fluvial systems. Values obtained from the Mesoproterozoic alluvial fan Heddersvatnet Formation (see Köykkä, 2011) indicate much steeper paleoslopes than those of the Svinsaga Formation.…”

“…Köykkä, 2011), indicates that paleohydrological investigations are important in interpreting ancient fluvial systems. Values obtained from the Mesoproterozoic alluvial fan Heddersvatnet Formation (see Köykkä, 2011) indicate much steeper paleoslopes than those of the Svinsaga Formation. Generally, the greater paleoslope values obtained from the Heddersvatnet Formation clearly indicate relics of steep margin channels, whereas the Svinsaga Formation braided system shows a more gentle paleoslope.…”

“…The sedimentology of the ancient braided stream sedimentation systems and channel-fills, in different tectonic settings, has been described in many studies (e.g., Eriksson et al, 2006Eriksson et al, , 2008Long, 2006), but only very few paleohydrological studies have been made on ancient fluvial deposits (e.g., Van Der Neut and Eriksson, 1999;Eriksson et al, 2006Eriksson et al, , 2008Davidson and Hartley, 2010;Köykkä, 2011). Eriksson et al (2006Eriksson et al ( , 2008 reported and discussed a possibly unique fluvial style from the Proterozoic (ca.…”

Constraints on the Statherian evolution of the intraplate rifting in a Paleo-Mesoproterozoic paleocontinent: New stratigraphic and geochronology record from the eastern São Francisco craton

“…In the Sapiranga Synthem, rounded to sub-rounded clasts of volcanic rocks (unstable fragments) are found in the conglomerates of lithofacies Cc, which preservation must have been most likely favored by arid climatic conditions. The developments of braided fluvial systems and "dry" aeolian deposits in part of the section are common to the filling under such climatic conditions (e.g., Aspler et al, 1994;Eriksson et al, 1998;Köykkä, 2011). The minor and thin lacustrine delta deposits (lithofacies associations A6 and A7) are also characteristic of sedimentation rift in an arid climate (e.g., Köykkä, 2011).…”