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Dislocation of Eemian peat in a deglaciation succession: stratigraphical implications for the Neubrandenburg area

Albrecht, Joachim LU (2003) In Zeitschrift für Geomorphologie 47(2). p.191-213
Abstract
A large gravel pit 30 km north of the Pomeranian ice margin has been investigated. Besides gravel, sand, fines and diamicton, several deposits of organic material are present, some of them showing a typical Eemian Pollen- and macroflora. Previous interpretations assume that the sediments below the Eemian peat belong to the Saalian, and those above the peat to the Weichselian. Sorted sediments in the central part of the pit are interpreted as Elsterian and Saalian glacifluvial channel fills. This study shows that all sediments in the pit belong to the last deglaciation and that none of the peat layers are in situ. Rafts of older sediments, including peat and older tills, have been dislocated during an ice advance and finally deposited in a... (More)
A large gravel pit 30 km north of the Pomeranian ice margin has been investigated. Besides gravel, sand, fines and diamicton, several deposits of organic material are present, some of them showing a typical Eemian Pollen- and macroflora. Previous interpretations assume that the sediments below the Eemian peat belong to the Saalian, and those above the peat to the Weichselian. Sorted sediments in the central part of the pit are interpreted as Elsterian and Saalian glacifluvial channel fills. This study shows that all sediments in the pit belong to the last deglaciation and that none of the peat layers are in situ. Rafts of older sediments, including peat and older tills, have been dislocated during an ice advance and finally deposited in a dead-ice environment during the retreat of the last ice sheet. The dominating gravel and sand deposits in the central part of the pit are interpreted as an intermediate braided river system in the dead-ice landscape. Debris-rich dead-ice melted down and melt-out material as well as mass-movement deposits were deposited. Pollen assemblages from the different organic materials suggest both Eemian and Tertiary origin. All of them are re-deposited. Since Eemian and Tertiary peat are not in situ in this open section, organic material from drill holes in the vicinity may also be re-deposited and might not serve as stratigraphical marker horizons. Thus, stratigraphical marker horizons such as peat cannot be accepted unconditionally, but must be proved in their sedimentological, stratigraphical and structural context. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Zeitschrift für Geomorphologie
volume
47
issue
2
pages
191 - 213
publisher
Gebr. Borntraeger Science Publishers
external identifiers
  • wos:000184539900003
  • scopus:17744398311
ISSN
0372-8854
language
English
LU publication?
yes
id
bb9257d1-b6d4-4584-96b0-385ff13b4f8c (old id 304791)
date added to LUP
2007-08-22 08:41:54
date last changed
2018-05-29 09:38:29
@article{bb9257d1-b6d4-4584-96b0-385ff13b4f8c,
  abstract     = {A large gravel pit 30 km north of the Pomeranian ice margin has been investigated. Besides gravel, sand, fines and diamicton, several deposits of organic material are present, some of them showing a typical Eemian Pollen- and macroflora. Previous interpretations assume that the sediments below the Eemian peat belong to the Saalian, and those above the peat to the Weichselian. Sorted sediments in the central part of the pit are interpreted as Elsterian and Saalian glacifluvial channel fills. This study shows that all sediments in the pit belong to the last deglaciation and that none of the peat layers are in situ. Rafts of older sediments, including peat and older tills, have been dislocated during an ice advance and finally deposited in a dead-ice environment during the retreat of the last ice sheet. The dominating gravel and sand deposits in the central part of the pit are interpreted as an intermediate braided river system in the dead-ice landscape. Debris-rich dead-ice melted down and melt-out material as well as mass-movement deposits were deposited. Pollen assemblages from the different organic materials suggest both Eemian and Tertiary origin. All of them are re-deposited. Since Eemian and Tertiary peat are not in situ in this open section, organic material from drill holes in the vicinity may also be re-deposited and might not serve as stratigraphical marker horizons. Thus, stratigraphical marker horizons such as peat cannot be accepted unconditionally, but must be proved in their sedimentological, stratigraphical and structural context.},
  author       = {Albrecht, Joachim},
  issn         = {0372-8854},
  language     = {eng},
  number       = {2},
  pages        = {191--213},
  publisher    = {Gebr. Borntraeger Science Publishers},
  series       = {Zeitschrift für Geomorphologie},
  title        = {Dislocation of Eemian peat in a deglaciation succession: stratigraphical implications for the Neubrandenburg area},
  volume       = {47},
  year         = {2003},
}