Recent sedimentation in three adjacent fjord-lakes on the Québec North Shore (eastern Canada): facies analysis, laminae preservation, and potential for varve formation

This paper analyzes short gravity cores sampled along transects in three adjacent deep fjord-lakes (lakes Pentecote, Walker and Pasteur) on the Quebec North Shore, Eastern Canada, in order to evaluate the distribution of laminated sediments and potential for varve formation. Facies analysis based on lithological description, digital photos, CT-scan images and bathymetric data allowed for the identification of four main sediment facies, namely: laminated sediments, partially laminated sediments, bioturbated sediments, and massive sediments. Direct evidence that Lake Walker undergoes thermal stratification was monitored from 2014–2016. Mean sedimentation rates and sedimentation fluxes of postglacial sediments in the distal basin of the three studied lakes are -1 and 0.03–0.16 g cm -2 a -1 , respectively based on 210 Pb, 137 Cs and AMS radiocarbon dating. On the basis of thin section image analysis and 210 Pb (CIC) chronology model, Lake ...