TY - JOUR

T1 - Faziesarchitektur und paläogeographische Bedeutung mittelpleistozäner glazilakustriner Eisrandsysteme in Nordwest- Deutschland

T2 - ein synoptischer Überblick

AU - Winsemann, Jutta

AU - Brandes, Christian

AU - Polom, Ulrich

AU - Weber, Christian

N1 - Funding information: Financial support by the MWK Niedersachsen (11.2-76202- 17-7/08) is gratefully acknowledged. We thank reviewers O. Juschus and W. Stackebrandt for helpful comments, which helped to improve the manuscript. S. Cramm, S. Grüneberg, W. Rode and D. Vogel (LIAG) carried out the seismic survey and J. Meinsen and D. Steinmetz helped with artwork. Special thanks go to the Geological Survey of Lower Saxony (LBEG) for providing the borehole data and the owners of the sand and gravel pits for the permission to work on their properties. This work also benefited from the discussion with many colleagues; in particular we would like to thank B. Deters, J. Elbracht, the late J.-P. Grötzner, F.-J. Harms, H. Jordan, B. Rakowski, H. Röhm, P. Rohde, K. Skupin, E. Speetzen, D. Tanner and P. Wellmann for discussion and providing unpublished data. Many thanks are also due to J. Buscher for improving the English.

PY - 2011/7/19

Y1 - 2011/7/19

N2 - Ice-marginal deposits are important palaeogeographic archives, recording the glacial history of sedimentary basins. This paper focuses on the sedimentary characteristics, depositional history and palaeogeographic significance of ice-marginal deposits in the Weserbergland and Leinebergland, which were deposited into deep proglacial lakes at the terminus of the Saalian Drenthe ice sheet. The depositional architecture and deformation patterns of ice-marginal deposits will be discussed with respect to glacier termini dynamics, lake-level fluctuations and basement tectonics. During the last 10 years, a total of 27 sand and gravel pits and more than 4000 borehole logs were evaluated in order to document the regional pattern and character of Middle Pleistocene ice-marginal deposits. The field study was supported with a shear-wave seismic survey. Based on this data set, and analysis of digital elevation models with geographic information systems (GIS), we attempt to improve earlier palaeogeographic reconstructions of glacial lakes in the Weserbergland and Leinebergland and reconcile some inconsistencies presented in the current valley-fill models. We hypothesize that the formation and catastrophic drainage of deep proglacial lakes in front of the Drenthe ice sheet considerably influenced the ice-sheet stability and may have initiated the Hondsrug ice stream and rapid deglaciation. Based on our analysis, it seems unlikely that the Elsterian ice sheet reached farther south than the Saalian Drenthe ice sheet in the study area.

AB - Ice-marginal deposits are important palaeogeographic archives, recording the glacial history of sedimentary basins. This paper focuses on the sedimentary characteristics, depositional history and palaeogeographic significance of ice-marginal deposits in the Weserbergland and Leinebergland, which were deposited into deep proglacial lakes at the terminus of the Saalian Drenthe ice sheet. The depositional architecture and deformation patterns of ice-marginal deposits will be discussed with respect to glacier termini dynamics, lake-level fluctuations and basement tectonics. During the last 10 years, a total of 27 sand and gravel pits and more than 4000 borehole logs were evaluated in order to document the regional pattern and character of Middle Pleistocene ice-marginal deposits. The field study was supported with a shear-wave seismic survey. Based on this data set, and analysis of digital elevation models with geographic information systems (GIS), we attempt to improve earlier palaeogeographic reconstructions of glacial lakes in the Weserbergland and Leinebergland and reconcile some inconsistencies presented in the current valley-fill models. We hypothesize that the formation and catastrophic drainage of deep proglacial lakes in front of the Drenthe ice sheet considerably influenced the ice-sheet stability and may have initiated the Hondsrug ice stream and rapid deglaciation. Based on our analysis, it seems unlikely that the Elsterian ice sheet reached farther south than the Saalian Drenthe ice sheet in the study area.

KW - Elsterian glaciation

KW - glacial Lake Leine

KW - glacial Lake Weser

KW - Hondsrug ice stream

KW - ice-marginal deltas

KW - normal faults

KW - north west Germany

KW - Saalian glaciation

KW - subaqueous ice-contact fans

UR - http://www.scopus.com/inward/record.url?scp=84855824263&partnerID=8YFLogxK

U2 - 10.3285/eg.60.2-3.01

DO - 10.3285/eg.60.2-3.01

M3 - Artikel

AN - SCOPUS:84855824263

VL - 60

SP - 212

EP - 235

JO - E and G Quaternary Science Journal

JF - E and G Quaternary Science Journal

SN - 0424-7116

IS - 2-3

ER -