Unexpected ice flow directions during the Late Weichselian deglaciation of the south Baltic area indicated by a new lithostratigraphy in NW Poland and NE Germany

1995 ◽  
Vol 28 ◽  
pp. 127-144 ◽  
Author(s):  
Erik Lagerlund ◽  
Kärstin Malmberg Persson ◽  
Dariusz Krzyszkowski ◽  
Per Johansson ◽  
Elzbieta Dobracka ◽  
...  
Keyword(s):  
The South ◽  
Ice Flow ◽  
Ne Germany ◽  
Flow Directions ◽  
Late Weichselian ◽  
Baltic Area ◽  
Nw Poland

scholarly journals Weichselian sedimentary record and ice-flow patterns in the Sodankylä area, central Finnish Lapland

2020 ◽  
Vol 92 (2) ◽  
pp. 77-98
Author(s):  
Annika Katarina Åberg ◽  
◽  
Seija Kultti ◽  
Anu Kaakinen ◽  
Kari O. Eskola ◽  
...  
Keyword(s):  
Flow Direction ◽  
Flow Patterns ◽  
Ice Flow ◽  
Fluvial Deposits ◽  
Finnish Lapland ◽  
Aeolian Deposits ◽  
Scandinavian Ice Sheet ◽  
Lidar Dem ◽  
Flow Directions ◽  
Late Weichselian

Three different till units separated by interstadial fluvial deposits were observed in the Sodankylä area in the River Kitinen valley, northern Finland. The interbedded glaciofluvial sediments and palaeosol were dated by OSL to the Early (79±12 to 67±13 ka) and Middle (41±9 ka) Weichselian. A LiDAR DEM, glacial lineations, the flow direction of till fabrics, esker chains and striations were applied to investigate the glacial flow patterns of the Sodankylä, Kittilä and Salla areas. The analysis revealed that the youngest movement of the Scandinavian Ice Sheet is not visible as DEM lineations within the studied areas. The modern morphology in Kittilä and Salla shows streamlined landforms of various dimensions mainly oriented from the NW and NNW, respectively, corresponding to the Early/Middle Weichselian ice-flow directions inferred from till fabrics. The Late Weichselian ice flow has produced an insignificant imprint on the landforms. This study suggests a northern location for the ice-divide zone during the Early/Middle Weichselian, and a more western–southwestern position during the Late Weichselian. The OSL ages of 14±3.3 ka from the aeolian deposits may indicate ice-free areas during the Bølling–Allerod warm period in the vicinity of the River Kitinen.

Late Weichselian ice-flow directions in J ren, SW Norway; clast fabric and clast lithology evidence in the uppermost till

1999 ◽  
Vol 53 (4) ◽  
pp. 177-189 ◽  
Author(s):  
Hafdís Eyglö Jönsdöttir ◽  
Hans Petter Sejrup ◽  
Eiliv Larsen ◽  
Knut Stalsberg
Keyword(s):  
Ice Flow ◽  
Flow Directions ◽  
Late Weichselian

Palynology of Permian shale, clay and sandstone clasts from the Basen till in northern Vestfjella, Dronning Maud Land

2005 ◽  
Vol 17 (1) ◽  
pp. 87-96 ◽  
Author(s):  
SOFIE LINDSTRÖM
Keyword(s):  
Sedimentary Rock ◽  
Sedimentary Rocks ◽  
Middle Permian ◽  
The South ◽  
Ice Flow ◽  
Rock Samples ◽  
Dronning Maud Land ◽  
Flow Directions

The palynological content of randomly collected sedimentary rock clasts from the till on the south-east slope of the Basen nunatak in northern Vestfjella in western Dronning Maud Land indicate that these sedimentary rocks were derived from strata of Middle Permian age. The palynological content and preservation is similar to palynofloras described from the sedimentary rocks that crop out at the Fossilryggen nunatak to the south-east, therefore, it seems likely that the Fossilryggen area represents the source of the sedimentary rock samples in the Basen till. This is further supported by known ice flow directions obtained from striations and clast fabric measurements in the area.

Port Bruce ice-flow directions based on heavy-mineral assemblages in tills from the south shore of Lake Erie in Ohio

1993 ◽  
Vol 30 (6) ◽  
pp. 1236-1241 ◽  
Author(s):  
John W. Hofer ◽  
John P. Szabo
Keyword(s):  
Lake Erie ◽  
Lake Ontario ◽  
Heavy Mineral ◽  
The South ◽  
Ice Flow ◽  
Probable Source ◽  
Mineral Assemblages ◽  
South Shore ◽  
Flow Directions

The flow directions of ice lobes within the Erie basin may be deduced from heavy-mineral assemblages of the Hayesville, Hiram, and Ashtabula tills deposited during the Port Bruce Stade after the Erie Interstade. These tills have heavy-mineral assemblages dominated by purple garnet, green hornblende, and clinopyroxene. Oolitic hematite occurs in all tills, but is dominant in the Ashtabula Till. The probable source of hematite is the Furnaceville Ironstone Member of the Clinton Group which crops out south of Lake Ontario. Trilinear plots of purple garnet – red garnet – epidote suggest that the eastern Grenville Subprovince is the provenance of all three tills. Southwestward-flowing ice of an Ontario–Erie lobe deposited these tills in the Erie basin. The Huron–Erie lobe did not deposit tills along the south shore of Lake Erie after the Erie Interstade.

scholarly journals Modeling ice birefringence and oblique radio wave propagation for neutrino detection at the South Pole

2020 ◽  
Vol 61 (81) ◽  
pp. 84-91 ◽  
Author(s):  
T. M. Jordan ◽  
D. Z. Besson ◽  
I. Kravchenko ◽  
U. Latif ◽  
B. Madison ◽  
...  
Keyword(s):  
Time Delays ◽  
Ice Core ◽  
High Energy ◽  
Propagation Model ◽  
Neutrino Interaction ◽  
Crystallographic Axis ◽  
South Pole ◽  
The South ◽  
Range Estimation ◽  
Ice Flow

AbstractThe Askaryan Radio Array (ARA) experiment at the South Pole is designed to detect high-energy neutrinos which, via in-ice interactions, produce coherent radiation at frequencies up to 1000 MHz. Characterization of ice birefringence, and its effect upon wave polarization, is proposed to enable range estimation to a neutrino interaction and hence aid in neutrino energy reconstruction. Using radio transmitter calibration sources, the ARA collaboration recently measured polarization-dependent time delay variations and reported significant time delays for trajectories perpendicular to ice flow, but not parallel. To explain these observations, and assess the capability for range estimation, we use fabric data from the SPICE ice core to model ice birefringence and construct a bounding radio propagation model that predicts polarization time delays. We compare the model with new data from December 2018 and demonstrate that the measurements are consistent with the prevailing horizontal crystallographic axis aligned near-perpendicular to ice flow. The study supports the notion that range estimation can be performed for near flow-perpendicular trajectories, although tighter constraints on fabric orientation are desirable for improving the accuracy of estimates.

scholarly journals “Striations” Produced by Catastrophic Subglacial Drainage of a Glacier-dammed Lake, Mjølkedalsbreen, Southern Norway

1989 ◽  
Vol 35 (120) ◽  
pp. 193-196 ◽  
Author(s):  
Danny McCarroll ◽  
John A. Matthews ◽  
Richard A. Shakesby
Keyword(s):  
Control Site ◽  
Ice Flow ◽  
Length Width ◽  
Flow Directions ◽  
Dammed Lake ◽  
Width Measurements ◽  
Southern Norway ◽  
Subglacial Drainage

Abstract “Striations” produced by catastrophic subglacial drainage of an ice-dammed lake were investigated in front of Mjelkedalsbreen, Jotunheimen, southern Norway. At each site, length, width, and orientation of at least 50 “striations” were recorded. These data are compared with similar measurements from a glacially abraded “control” site. On the basis of length or width measurements alone, “striations” produced by subglacial drainage are not consistently distinguishable from those produced by glacial abrasion. However, the former display more variable orientations and cross-cutting relationships which could be misinterpreted as indicating changing ice-flow directions. They can be recognized by the occurrence of some “striations” with relatively low length : width ratios, which indicate the transport of boulders by saltation.

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