The postglacial history of Kitkajärvi, North-eastern Finland, as indicated by trend-surface analysis and radio-carbon dating
The Kitka lake complex (Kitkajärvi), some 300 km2 in total area, is located at an altitude of 240.2 m a.s.l. on the Maanselkä watershed. Its waters flow eastwards to the White Sea via the river Kitkajoki. The western parts of the lake basin in particular feature shores now situated on dry land. The...
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1977
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fttsvojs:oai:journal.fi:article/9557 2023-05-15T18:43:53+02:00 The postglacial history of Kitkajärvi, North-eastern Finland, as indicated by trend-surface analysis and radio-carbon dating Heikkinen, Olavi Kurimo, Heikki 1977-01-01 https://fennia.journal.fi/article/view/9557 en eng Geographical Society of Finland https://fennia.journal.fi/article/view/9557 Copyright (c) 2014 Fennia Fennia; Vol 153 Nro 1 (1977) Fennia - International Journal of Geography; Vol 153 No 1 (1977) 1798-5617 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article 1977 fttsvojs 2020-09-30T22:46:18Z The Kitka lake complex (Kitkajärvi), some 300 km2 in total area, is located at an altitude of 240.2 m a.s.l. on the Maanselkä watershed. Its waters flow eastwards to the White Sea via the river Kitkajoki. The western parts of the lake basin in particular feature shores now situated on dry land. The clearest raised shore‑line represents a phase of Kitkajärvi called here Early Kitka. The postglacial history of the lake complex is studied here by means of trend‑surface analysis and a combination of pollen stratigraphy with radio‑carbon dating. The area is shown to have undergone deglaciation around 9400–9500 B. P. and to have been supra‑aquatic from the outset. The Early Kitka shore‑line now slopes from west to east with a gradient of approx. 0.2 m/km. At this early phase the lake possessed bifurcation features, having one outflow channel eastwards via Kitkajoki and another westwards into the Gulf of Bothnia via Livojärvi. This latter route, which most probably existed immediately on deglaciation, was closed around 8400 B. P. A gradient curve for the Kitka region is presented based on dated shorelines, and this suggests an exponential decrease in shore level gradients towards the present day. Article in Journal/Newspaper White Sea Federation of Finnish Learned Societies: Scientific Journals Online Kitka ENVELOPE(28.980,28.980,66.243,66.243) Kitkajoki ENVELOPE(29.650,29.650,66.283,66.283) Livojärvi ENVELOPE(28.200,28.200,65.983,65.983) Maanselkä ENVELOPE(29.035,29.035,65.903,65.903) White Sea |
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Open Polar |
collection |
Federation of Finnish Learned Societies: Scientific Journals Online |
op_collection_id |
fttsvojs |
language |
English |
description |
The Kitka lake complex (Kitkajärvi), some 300 km2 in total area, is located at an altitude of 240.2 m a.s.l. on the Maanselkä watershed. Its waters flow eastwards to the White Sea via the river Kitkajoki. The western parts of the lake basin in particular feature shores now situated on dry land. The clearest raised shore‑line represents a phase of Kitkajärvi called here Early Kitka. The postglacial history of the lake complex is studied here by means of trend‑surface analysis and a combination of pollen stratigraphy with radio‑carbon dating. The area is shown to have undergone deglaciation around 9400–9500 B. P. and to have been supra‑aquatic from the outset. The Early Kitka shore‑line now slopes from west to east with a gradient of approx. 0.2 m/km. At this early phase the lake possessed bifurcation features, having one outflow channel eastwards via Kitkajoki and another westwards into the Gulf of Bothnia via Livojärvi. This latter route, which most probably existed immediately on deglaciation, was closed around 8400 B. P. A gradient curve for the Kitka region is presented based on dated shorelines, and this suggests an exponential decrease in shore level gradients towards the present day. |
format |
Article in Journal/Newspaper |
author |
Heikkinen, Olavi Kurimo, Heikki |
spellingShingle |
Heikkinen, Olavi Kurimo, Heikki The postglacial history of Kitkajärvi, North-eastern Finland, as indicated by trend-surface analysis and radio-carbon dating |
author_facet |
Heikkinen, Olavi Kurimo, Heikki |
author_sort |
Heikkinen, Olavi |
title |
The postglacial history of Kitkajärvi, North-eastern Finland, as indicated by trend-surface analysis and radio-carbon dating |
title_short |
The postglacial history of Kitkajärvi, North-eastern Finland, as indicated by trend-surface analysis and radio-carbon dating |
title_full |
The postglacial history of Kitkajärvi, North-eastern Finland, as indicated by trend-surface analysis and radio-carbon dating |
title_fullStr |
The postglacial history of Kitkajärvi, North-eastern Finland, as indicated by trend-surface analysis and radio-carbon dating |
title_full_unstemmed |
The postglacial history of Kitkajärvi, North-eastern Finland, as indicated by trend-surface analysis and radio-carbon dating |
title_sort |
postglacial history of kitkajärvi, north-eastern finland, as indicated by trend-surface analysis and radio-carbon dating |
publisher |
Geographical Society of Finland |
publishDate |
1977 |
url |
https://fennia.journal.fi/article/view/9557 |
long_lat |
ENVELOPE(28.980,28.980,66.243,66.243) ENVELOPE(29.650,29.650,66.283,66.283) ENVELOPE(28.200,28.200,65.983,65.983) ENVELOPE(29.035,29.035,65.903,65.903) |
geographic |
Kitka Kitkajoki Livojärvi Maanselkä White Sea |
geographic_facet |
Kitka Kitkajoki Livojärvi Maanselkä White Sea |
genre |
White Sea |
genre_facet |
White Sea |
op_source |
Fennia; Vol 153 Nro 1 (1977) Fennia - International Journal of Geography; Vol 153 No 1 (1977) 1798-5617 |
op_relation |
https://fennia.journal.fi/article/view/9557 |
op_rights |
Copyright (c) 2014 Fennia |
_version_ |
1766234405799460864 |