Spatial and interannual variations in sedimentation patterns recorded in nonglacial varved sediments from the Canadian High Arctic

摘要: Multiple cores taken throughout Nicolay Lake in the Canadian High Arctic contain laminated sediments that are interpreted as varved. Annual sediment accumulation during last 197 years reveals three major patterns have important implications for hydroclimatic reconstruction. Widespread dispersal is evident most and contrasts with when anomalous localized bifurcating of deposition occur. Localized limited to centre lake attributed turbidity currents originate on delta foreslope. In contrast, a pattern produced river supplying switches from one two distributaries, resulting altered proximal accumulation. Principal component analysis additional anomalies sedimentologically indistinct, but constitute sources variance. The recognition removal critical accurate reconstruction flux catchment, particularly long records where geomorphic conditions may changed. This study identifies potentially misleading depositional artifacts methodology recognize similar controls other lakes.