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Revision of river terrace geochronology in the Orawa-Nowy Targ Depression, south Poland : insights from OSL dating

Olszak, Janusz; Kukulak, Józef and Alexanderson, Helena LU (2016) In Proceedings of the Geologists' Association 127(5). p.595-605
Abstract

Geochronologies of intramontane depression (basin) fluvial sedimentation enable to identify through time periods of alluviation and river erosion, and date fault movement. For these purposes the optically stimulated luminescence (OSL) dating has been applied to evaluate and to develop a geochronological framework of river terraces. We study the age of river terrace deposits of the Czarny Dunajec River and its tributaries, in the Orawa-Nowy Targ Depression situated at the contact of the Central and the Outer Carpathians; where alluvial sediment ages were derived mainly from morphostratigraphic dating. Thorough careful analysis our approach demonstrates that the OSL dates differ markedly from the previous age assignments. Alluvium of the... (More)

Geochronologies of intramontane depression (basin) fluvial sedimentation enable to identify through time periods of alluviation and river erosion, and date fault movement. For these purposes the optically stimulated luminescence (OSL) dating has been applied to evaluate and to develop a geochronological framework of river terraces. We study the age of river terrace deposits of the Czarny Dunajec River and its tributaries, in the Orawa-Nowy Targ Depression situated at the contact of the Central and the Outer Carpathians; where alluvial sediment ages were derived mainly from morphostratigraphic dating. Thorough careful analysis our approach demonstrates that the OSL dates differ markedly from the previous age assignments. Alluvium of the terrace elevated 5.5–6.0 m above the present-day valley floor, in terms of cementation and lithology resembling sediments described as pre-Pleistocene, was found to have been deposited ∼34 ka ago (MIS 3). Sediments of the lower terraces, 3 m and 3.5 m high, similar in elevation and internal structure to those of the Holocene terraces, are most likely of MIS 3 and MIS 2 ages, respectively. The architecture of the terraces introduces climate as a dominant driver for terrace formation at the southern border of the depression. We conclude that the morphostratigraphic approach appears insufficient for reliable dating of river terraces, especially in areas where they might be affected by young tectonic movements. Comprehensive and credible chronostratigraphy of fluvial deposits is required, particularly in the studies of the history of the fluvial systems and seismic hazard in the Carpathians.

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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Carpathians, Morphostratigraphy, Orawa-Nowy Targ Depression, OSL dating, River terraces
in
Proceedings of the Geologists' Association
volume
127
issue
5
pages
11 pages
publisher
Elsevier
external identifiers
  • scopus:85006314478
  • wos:000389117000005
ISSN
0016-7878
DOI
10.1016/j.pgeola.2016.09.004
language
English
LU publication?
yes
id
6e5fa988-4c84-4fd8-b74b-1fe9bb06f259
date added to LUP
2017-01-12 07:44:15
date last changed
2017-09-18 11:36:05
@article{6e5fa988-4c84-4fd8-b74b-1fe9bb06f259,
  abstract     = {<p>Geochronologies of intramontane depression (basin) fluvial sedimentation enable to identify through time periods of alluviation and river erosion, and date fault movement. For these purposes the optically stimulated luminescence (OSL) dating has been applied to evaluate and to develop a geochronological framework of river terraces. We study the age of river terrace deposits of the Czarny Dunajec River and its tributaries, in the Orawa-Nowy Targ Depression situated at the contact of the Central and the Outer Carpathians; where alluvial sediment ages were derived mainly from morphostratigraphic dating. Thorough careful analysis our approach demonstrates that the OSL dates differ markedly from the previous age assignments. Alluvium of the terrace elevated 5.5–6.0 m above the present-day valley floor, in terms of cementation and lithology resembling sediments described as pre-Pleistocene, was found to have been deposited ∼34 ka ago (MIS 3). Sediments of the lower terraces, 3 m and 3.5 m high, similar in elevation and internal structure to those of the Holocene terraces, are most likely of MIS 3 and MIS 2 ages, respectively. The architecture of the terraces introduces climate as a dominant driver for terrace formation at the southern border of the depression. We conclude that the morphostratigraphic approach appears insufficient for reliable dating of river terraces, especially in areas where they might be affected by young tectonic movements. Comprehensive and credible chronostratigraphy of fluvial deposits is required, particularly in the studies of the history of the fluvial systems and seismic hazard in the Carpathians.</p>},
  author       = {Olszak, Janusz and Kukulak, Józef and Alexanderson, Helena},
  issn         = {0016-7878},
  keyword      = {Carpathians,Morphostratigraphy,Orawa-Nowy Targ Depression,OSL dating,River terraces},
  language     = {eng},
  month        = {11},
  number       = {5},
  pages        = {595--605},
  publisher    = {Elsevier},
  series       = {Proceedings of the Geologists' Association},
  title        = {Revision of river terrace geochronology in the Orawa-Nowy Targ Depression, south Poland : insights from OSL dating},
  url          = {http://dx.doi.org/10.1016/j.pgeola.2016.09.004},
  volume       = {127},
  year         = {2016},
}