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Recent sedimentation in a high arctic lake, northern Ellesmere Island, Canada

Identifieur interne : 001681 ( Istex/Corpus ); précédent : 001680; suivant : 001682

Recent sedimentation in a high arctic lake, northern Ellesmere Island, Canada

Auteurs : Bern Zolitschka

Source :

RBID : ISTEX:26F38AB53EE926C194F7738A0F7511DD22190775

Abstract

Abstract: A multiple core study was conducted on laminated minerogenic sediments from Lake C2, Northern Ellesmere Island, Canadian High Arctic. Lateral persistence, distal thinning, variation in grain size of these laminations as well as present-day processes of highly seasonal sediment transfer into the lake basin suggest that clastic varves have been formed. Sedimentation rates based on 210Pb dating agree well with sedimentation rates based on lamination counts giving further evidence that laminations are annual. Errors in varve counting were reduced from 12% to < 2% using the multi-core approach of cross-correlating all records. Varved sediments are occasionally interrupted by thick coarse-grained layers, which are interpreted as deposits of turbidity currents and may be related to extremely high discharge events and slope failures of the delta front. Micro-laminated sediments spanning the last two centuries were studied in detail. Suspension settling is the dominant process of deposition depending upon stream discharge which is controlled by nival melt and summer temperatures. Application of varve chronology thus allows to use lamination thickness measurements as source of high resolution proxy data for palaeoclimatic reconstruction.

Url:
DOI: 10.1007/BF00176934

Links to Exploration step

ISTEX:26F38AB53EE926C194F7738A0F7511DD22190775

Le document en format XML

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