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Profile of sediment echo sounding during POLARSTERN cruise ARK-XX/1 with links to ParaSound data files

Authors
Publisher
PANGAEA
Publication Date
Identifiers
DOI: 10.1594/pangaea.756573
Keywords
  • Ark-Xx/1
  • Atlas Parasound P70 Deep-Sea Parametric Sub-Bottom Profiler
  • Awi_Paleo
  • Paleoenvironmental Reconstructions From Marine Sediments @ Awi
  • Polarstern
  • Ps66
  • Ps66/1-Track
  • Underway Cruise Track Measurements
  • Uniform Resource Locator/Link To Raw Data File
Disciplines
  • Archaeology
  • Earth Science

Abstract

Ghostscript wrapper for G:\Users\rsieger.DMAWI\Documents\Umbruch 79 (2).pdf Abstract: A 2420 km long profile of high-resolution sub-bottom echosounder data (PARASOUND) is interpreted for facies distribution and stratigraphy across the Canadian Arctic Archipelago including the continental slopes from Baffin Bay to Beaufort Sea through M’Clure Strait. Five units are identified and interpreted as (i) bedrock (Devonian sedimentary rocks), unconformably over- lain by (ii) subglacial till, overlain by (iii) proglacial diamicton deposited during deglaciation with (iv) Holocene muds on top. Subglacial tills have a basinward counterpart of numerous thick stacked debris-flow deposits found on the continental slopes of Baffin Bay and the Beaufort Sea interfingering with stratified deep-sea sediments at the continental rise (v). The debris flows are interpreted as mostly LGM in age and built up major glacial Trough Mouth Fans at both ends of Northwest Passage. They are indicative of ocean- ward export of glacial debris from fast flowing ice streams at the shelf edge derived from the Laurentide and Innuitian ice sheets. Diamicton deposited during deglaciation is widespread in the inner part of the Northwest Passage but relatively thin. Evidence of moraines as part of the deglaciation deposits points to a re-advance of grounding ice in places, which we interpret as possibly Younger Dryas and early Holocene in age. Postglacial Holocene sedi- ments of significant thickness (>0.2 m) were only found in depressions of the Lancaster Sound and Barrow Strait. Zusammenfassung: Entlang einer 2420 km langen Profillinie durch den Kanadisch-Arktischen Archipel mit den angrenzenden Kontinentalhängen von der Baffinbay durch die M’Clure-Straße bis zur Beaufortsee werden hoch auflösende Sedimentechographien (PARASOUND) in Bezug auf Stratigraphie und Faziesverteilung ausgewertet. Es liegen fünf Einheiten vor, die, von unten nach oben, als (i) Untergrund (Devonische Sedimentgesteine mit Erosionsdis- kordanz zum Hangenden), (

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