A note on a thermokarst feature on the North Slope of Alaska
A thermokarst depression with active thermal erosion on one margin and a drainage way to the Sagavanirktok River is described with the aid of a sketch plan and sections. The depression is surrounded by moist tundra with thermal contraction polygons and floored by wet tundra with extensive pools. It...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
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Geological Society of Finland
1994-06-01
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| Series: | Bulletin of the Geological Society of Finland |
| Subjects: | |
| Online Access: | http://www.geologinenseura.fi/bulletin/Volume66/sgs_bt_066_1_pages_045_052.pdf |
| _version_ | 1811311719418429440 |
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| author | R.G. West J.J. Donner T. Kankainen |
| author_facet | R.G. West J.J. Donner T. Kankainen |
| author_sort | R.G. West |
| collection | DOAJ |
| description | A thermokarst depression with active thermal erosion on one margin and a drainage way to the Sagavanirktok River is described with the aid of a sketch plan and sections. The depression is surrounded by moist tundra with thermal contraction polygons and floored by wet tundra with extensive pools. It is drained by a partly sinuous flat-floored shallow valley with gentle margins. Three radiocarbon dates from a section of organic sediment at the margin of the depression, exposed by erosion, show that its accumulation extends back at least 7410 radiocarbon years. A pollen spectrum from the organic sediment at 5240a BP indicates the presence of moist tundra heath with dwarf shrubs. The feature is briefly discussed in relation to Pleistocene relict thermokarst. |
| first_indexed | 2024-04-13T10:22:50Z |
| format | Article |
| id | doaj.art-4ccf120ac697417490181c4656a348b6 |
| institution | Directory Open Access Journal |
| issn | 0367-5211 1799-4632 |
| language | English |
| last_indexed | 2024-04-13T10:22:50Z |
| publishDate | 1994-06-01 |
| publisher | Geological Society of Finland |
| record_format | Article |
| series | Bulletin of the Geological Society of Finland |
| spelling | doaj.art-4ccf120ac697417490181c4656a348b62022-12-22T02:50:25ZengGeological Society of FinlandBulletin of the Geological Society of Finland0367-52111799-46321994-06-01661455210.17741/bgsf/66.1.004A note on a thermokarst feature on the North Slope of AlaskaR.G. WestJ.J. DonnerT. KankainenA thermokarst depression with active thermal erosion on one margin and a drainage way to the Sagavanirktok River is described with the aid of a sketch plan and sections. The depression is surrounded by moist tundra with thermal contraction polygons and floored by wet tundra with extensive pools. It is drained by a partly sinuous flat-floored shallow valley with gentle margins. Three radiocarbon dates from a section of organic sediment at the margin of the depression, exposed by erosion, show that its accumulation extends back at least 7410 radiocarbon years. A pollen spectrum from the organic sediment at 5240a BP indicates the presence of moist tundra heath with dwarf shrubs. The feature is briefly discussed in relation to Pleistocene relict thermokarst.http://www.geologinenseura.fi/bulletin/Volume66/sgs_bt_066_1_pages_045_052.pdfthermokarstorganic residuespollen analysisabsolute ageC-13HoloceneAlaska |
| spellingShingle | R.G. West J.J. Donner T. Kankainen A note on a thermokarst feature on the North Slope of Alaska Bulletin of the Geological Society of Finland thermokarst organic residues pollen analysis absolute age C-13 Holocene Alaska |
| title | A note on a thermokarst feature on the North Slope of Alaska |
| title_full | A note on a thermokarst feature on the North Slope of Alaska |
| title_fullStr | A note on a thermokarst feature on the North Slope of Alaska |
| title_full_unstemmed | A note on a thermokarst feature on the North Slope of Alaska |
| title_short | A note on a thermokarst feature on the North Slope of Alaska |
| title_sort | note on a thermokarst feature on the north slope of alaska |
| topic | thermokarst organic residues pollen analysis absolute age C-13 Holocene Alaska |
| url | http://www.geologinenseura.fi/bulletin/Volume66/sgs_bt_066_1_pages_045_052.pdf |
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