New age constraints from the SW Baltic Sea area - implications for Scandinavian Ice Sheet dynamics and palaeo-environmental conditions during MIS 3 and early MIS 2

Boreas ◽  
2016 ◽  
Vol 46 (1) ◽  
pp. 34-52 ◽  
Author(s):  
Michael Kenzler ◽  
Sumiko Tsukamoto ◽  
Stefan Meng ◽  
Manfred Frechen ◽  
Heiko Hüneke
Keyword(s):  
Baltic Sea ◽  
Environmental Conditions ◽  
Ice Sheet ◽  
New Age ◽  
Mis 3 ◽  
Scandinavian Ice Sheet ◽  
Ice Sheet Dynamics ◽  
Sea Area ◽  
Age Constraints

scholarly journals New age constraints for the maximum extent of the last British-Irish Ice Sheet (NW sector)

2012 ◽  
Vol 28 (1) ◽  
pp. 2-7 ◽  
Author(s):  
J. D. Everest ◽  
T. Bradwell ◽  
M. Stoker ◽  
S. Dewey
Keyword(s):  
Ice Sheet ◽  
New Age ◽  
Maximum Extent ◽  
Age Constraints

Ice sheet dynamics on the Lofoten–Vesterålen shelf, north Norway, from Late MIS-3 to Heinrich Stadial 1

2015 ◽  
Vol 119 ◽  
pp. 136-156 ◽  
Author(s):  
Jo Brendryen ◽  
Haflidi Haflidason ◽  
Leif Rise ◽  
Shyam Chand ◽  
Maarten Vanneste ◽  
...  
Keyword(s):  
Ice Sheet ◽  
Mis 3 ◽  
Ice Sheet Dynamics ◽  
North Norway

scholarly journals New age constraints for the limit of the British-Irish Ice Sheet on the Isles of Scilly

2017 ◽  
Vol 32 (1) ◽  
pp. 48-62 ◽  
Author(s):  
R. K. Smedley ◽  
J. D. Scourse ◽  
D. Small ◽  
J. F. Hiemstra ◽  
G. A. T. Duller ◽  
...  
Keyword(s):  
Ice Sheet ◽  
New Age ◽  
Age Constraints

scholarly journals Proposing a new conceptual model for the reconstruction of ice dynamics in the SW sector of the Scandinavian Ice Sheet (SIS) based on the reinterpretation of published data and new evidence from optically stimulated luminescence (OSL) dating

2020 ◽  
Vol 69 (2) ◽  
pp. 201-223
Author(s):  
Christopher Lüthgens ◽  
Jacob Hardt ◽  
Margot Böse
Keyword(s):  
Baltic Sea ◽  
Optically Stimulated Luminescence ◽  
The South ◽  
Geochronological Data ◽  
The Baltic Sea ◽  
Ice Dynamics ◽  
Mis 3 ◽  
Scandinavian Ice Sheet ◽  
The Baltic ◽  
The Last Glacial

Abstract. We propose a new concept of the Weichselian ice dynamics in the south-western sector of the Baltic Sea depression. The review of existing geochronological data from Germany, Denmark and southernmost Sweden in combination with new optically stimulated luminescence (OSL) data from the German Oder Lobe area is the basis for a reassessment and an improvement of previous ice dynamic models. Factors like the pre-existing topography, glaciotectonic features and the occurrence of till beds and inter-till deposits of varying origin are also taken into consideration for our process-based reconstruction of the sedimentary environments close to the ice margin and hence the ice dynamics of the Scandinavian Ice Sheet (SIS). During the early MIS 3 (marine isotope stage), the late MIS 3 and MIS 2, the SIS advanced into present-day terrestrial areas around the south-western Baltic Sea Basin. The first ice advance during the warming phase in early MIS 3 is poorly documented as the Ellund–Warnow Advance in Germany but may be correlated with the numerically dated Ristinge Advance in Denmark and Sweden. The late MIS 3 advance in contrast is reliably documented. It shaped the landforms of the Brandenburg Advance and the maximum Weichselian ice extent in the Oder Lobe area in north-eastern Germany and occurred contemporaneously with the Klintholm Advance in southern Sweden and Denmark. The lack of a corresponding till in various cliff profiles along the Baltic Sea coastline between southern Schleswig-Holstein and the island of Rügen can be explained by the distinct lobate structure of this ice advance, which was strongly guided by the pre-existing low-lying topography. We propose the horst of Bornholm, Denmark, acting as an ice divide, with ice-dammed lakes existing on the lee side between two glacier lobes. This lobate structure had not been considered in previous conceptual models, which led to seemingly conflicting chronological and stratigraphical interpretations. Our introduction of the lobate structure for the first time resolves these contradictions and integrates the data in a coherent model. The dynamics of the MIS 2 readvance to the Last Glacial Maximum (LGM) extent were clearly different to the previous advance and were most likely characterized by a more uniformly advancing ice front with a less lobate structure which also overrode the horst of Bornholm and the island of Rügen. This advance reached the maximum Weichselian ice extent in some parts of the south-western SIS, but, in the Oder Lobe area, it is proven to have terminated at a lesser extent than the early MIS 3 advance, but it did shape the most prominent morphological landform record of the last glacial cycle. In order to advance the reconstruction of Weichselian ice dynamics in the future, we strongly suggest using both an MIS-based terminology and a process-based approach in the interpretation of geochronological data to live up to the dynamic nature of continental ice sheets.

Tephrochronological evidence of a later Younger Dryas ice-sheet maximum in central Norway

2021 ◽  
Author(s):  
Simon A. Larsson ◽  
Stefan Wastegård ◽  
Fredrik Høgaas
Keyword(s):  
Radiocarbon Dating ◽  
Ice Sheet ◽  
Younger Dryas ◽  
Coastal Lake ◽  
Cold Event ◽  
Western Norway ◽  
Scandinavian Ice Sheet ◽  
Marine Fossils ◽  
Ice Sheet Dynamics ◽  
Southern Norway

<p>The Scandinavian Ice Sheet responded time-transgressively to the Younger Dryas (Greenland Stadial 1) cold event with large regional variations. Around Trondheimsfjorden in central Norway, the Tautra Moraines and the Hoklingen Moraines have long been assumed to have formed by glacial readvances during this event, as they have been dated to c. 12.7 and 11.6 cal. ka BP respectively (Olsen et al., 2015), mainly based on radiocarbon dating of often marine fossils. The Tautra Moraines, being the outer ridges of the two, should thus represent the maximum ice-sheet extent in this region during the Younger Dryas.</p><p>This ice-front position established a pro-glacial lake west of present-day Leksvik village on the Fosen peninsula (Selnes, 1982), which covered the Lomtjønnin lakes and Lomtjønnmyran fens, and drained through a spillway via Lake Rørtjønna. Some 20 km inland (northeast) from this location, inside the Tautra Moraines, the location of the Damåsmyran bog was covered by the ice sheet at that time.</p><p>By examining sediments from these sites for occurrences of volcanic ashes (visible and cryptotephra), combined with radiocarbon dating, we find that the ice front remained at the Tautra Moraines until the late Younger Dryas, contrary to the previous chronology (and overriding the suggested formation age of the Hoklingen Moraines). These findings comply with several recent reconstructions of the deglaciation at other sites in western (Lohne et al., 2012; Mangerud et al., 2016) and southern Norway (Romundset et al., 2019) and are a strong example of the usefulness of tephrochronology in the reconstruction of past ice-sheet dynamics.</p><p> </p><p><strong>References</strong></p><p>Lohne, Ø.S., Mangerud, J. & Svendsen, J.I. (2012) Timing of the Younger Dryas glacial maximum in Western Norway. <em>Journal of Quaternary Science</em>, vol. 27, pp. 81–88.</p><p>Mangerud, J., Aarseth, I., et al. (2016) A major re-growth of the Scandinavian Ice Sheet in western Norway during Allerød–Younger Dryas. <em>Quaternary Science Reviews</em>, vol. 132, pp. 175–205.</p><p>Olsen, L., Høgaas, F. & Sveian, H. (2015) Age of the Younger Dryas ice-marginal substages in Mid-Norway—Tautra and Hoklingen, based on a compilation of 14C-dates. <em>Norges geologiske undersøkelse Bulletin</em>, vol. 454, pp. 1–13.</p><p>Romundset, A., Lakeman, T.R. & Høgaas, F. (2019) Coastal lake records add constraints to the age and magnitude of the Younger Dryas ice-front oscillation along the Skagerrak coastline in southern Norway. <em>Journal of Quaternary Science</em>, vol. 34, pp. 112–124.</p><p>Selnes, H. (1982) Paleo-økologiske undersøkelser omkring israndavsetninger på Fosenhalvøya, Midt-Norge. Thesis at the Department of Botany, University of Trondheim.</p>

Age and duration of a MIS 3 interstadial in the Fennoscandian Ice Sheet core area – Implications for ice sheet dynamics

2021 ◽  
Vol 264 ◽  
pp. 107011
Author(s):  
Johan Kleman ◽  
Martina Hättestrand ◽  
Ingmar Borgström ◽  
Derek Fabel ◽  
Frank Preusser
Keyword(s):  
Ice Sheet ◽  
Core Area ◽  
Mis 3 ◽  
Ice Sheet Dynamics
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