Bedrock morphology reveals drainage network in northeast Baffin Bay

Slabon, Patricia; Dorschel, Boris; Jokat, Wilfried; Freire, Francis

doi:10.1016/j.geomorph.2017.11.024

Cited by 8 publications

(2 citation statements)

References 77 publications

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“…2015; Slabon et al . 2016, 2018a, b), establishing chronologies for the deglaciation as well as outlining the general postglacial sediment infill. In between lies the still poorly investigated Upernavik trough that is fed by one of the major ice streams in West Greenland, the Upernavik Isstrøm (Briner et al .…”

Section: Figmentioning

confidence: 99%

The deglaciation of Upernavik trough, West Greenland, and its Holocene sediment infill: processes and provenance

Weiser

Titschack

Hebbeln

2023

Boreas

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Under glacial climates, continental ice sheets such as, e.g., the Greenland Ice Sheet, extended onto the continental shelves and often carved out deep cross-shelf troughs. The sedimentary infill of such troughs commonly is a product of the complex interactions between the ice sheets, largely driving sediment input into the ocean, and the surrounding water masses. Off West Greenland, research has focused on the Disko and Uummannaq troughs, leaving the northerly adjacent Upernavik trough relatively understudied. Hence, neither the chronology of deglaciation nor the details of its postglacial infill are sufficiently well understood. Here, we combine computed tomography image-derived information with geochemical and granulometric data from four sediment cores recovered from the Upernavik trough that point to (i) deglaciation of the mid-shelf probably around 13.4 cal. ka BP that was most likely driven by a northward advection of warmer Atlantic waters during the Bølling-Allerød, (ii) the presence of widespread mass wasting around 8 cal. ka BP on the inner shelf and (iii) the complex interplay between various modes of sediment input, transport and deposition under hemipelagic sedimentation afterwards. While this interplay complicates provenance studies, we identify two major sediment delivery mechanisms that control transport and deposition from four sediment source areas. Through the Early Holocene the relative contributions of sediments from the various sources changed from a predominantly local origin to more southerly sources, mainly driven by decreasing input from the local sources. The integration of relative sediment source contributions with varying sedimentation rates challenges previous studies postulating intensified sediment delivery from the south through a greater influence of the West Greenland Current and highlights the need for the integration of sediment input and transport mechanisms into provenance studies in the area.

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Section: Figmentioning

confidence: 99%

The deglaciation of Upernavik trough, West Greenland, and its Holocene sediment infill: processes and provenance

Weiser

Titschack

Hebbeln

2023

Boreas

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“…On swath bathymetry imagery, meltwater channels take the shape of sinuous longitudinal depressions (negative landform) that are generally carved in bedrock (Lowe & Anderson, 2003;Nitsche et al, 2013;Slabon, Dorschel, Jokat, & Freire, 2018). Some channels are characterized by a flat bottom which indicates sediment infill (Brouard & Lajeunesse, 2019a;).…”

Section: Meltwater Channelsmentioning

confidence: 99%

Submarine geomorphology of the northeastern Baffin Island fiords and cross-shelf troughs

Brouard

Lajeunesse

2019

Journal of Maps

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This paper presents a series of 50 geomorphological maps of the seabed of northeastern Baffin Island fiords and cross-shelf troughs, in eastern Arctic Canada. The mapping was produced using swath bathymetry imagery from multiple bathymetry datasets. A total of 24 types of landform were systematically mapped (>55,000 landforms) and reflect processes linked to subglacial, ice-marginal or paraglacial to postglacial environments. The landforms record the transition of the seabed from being covered by a marineterminating ice sheet to the establishment of postglacial conditions. The landform assemblages allow the distinction of ice-flows orientation and ice-stream pathways along fiords and cross-shelf troughs. The multiple moraines and grounding-zone wedges indicate that the ice margin stabilized during retreat and that the overall deglaciation occurred by steps. These maps provide a framework for future investigations in northeastern Baffin Island fiords and shelf and can also provide a template for future seabed geomorphological studies in Arctic Canada. ARTICLE HISTORY

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Assessing the control factors upon glacial valley development in southernmost Patagonia (Fuegian Andes of Argentina)

Oliva,

Cioccale,

Rabassa

2023

Geomorphology

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Bedrock morphology reveals drainage network in northeast Baffin Bay

Cited by 8 publications

References 77 publications

The deglaciation of Upernavik trough, West Greenland, and its Holocene sediment infill: processes and provenance

The deglaciation of Upernavik trough, West Greenland, and its Holocene sediment infill: processes and provenance

Submarine geomorphology of the northeastern Baffin Island fiords and cross-shelf troughs

Assessing the control factors upon glacial valley development in southernmost Patagonia (Fuegian Andes of Argentina)

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