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Academic & Professional Books  Palaeontology  Palaeontology: General

The Geomorphological Setting, Glacial History and Holocene Development of 'Kap Inglefield Sø', Inglefield Land, North-West Greenland

Monograph
By: Weston Blake, Jr.(Author), Mary M Boucherle(Author), Bent Fredskild(Author), Jan A Janssens(Author), John P Smol(Author)
42 pages, illustrations
The Geomorphological Setting, Glacial History and Holocene Development of 'Kap Inglefield Sø', Inglefield Land, North-West Greenland
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  • The Geomorphological Setting, Glacial History and Holocene Development of 'Kap Inglefield Sø', Inglefield Land, North-West Greenland ISBN: 9788763512138 Paperback Jan 1992 Not in stock: Usually dispatched within 1-2 weeks
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About this book

A 115 cm-long core was raised from an irregular shaped lake informally named "Kap Inglefield Sø", 1.5 km southeast of Kap Inglefield, North-West Greenland, at an elevation of 150 m. A 49 cm-thick organic sequence is underlain by banded sediment (sand alternating with clay/silt), deposited in an ice-dammed lake. Today the lake is held up at the outlet by bouldery till containing marien shells. The presence of till containing shells with low D/L ratios for aspartic acid at several inland sites, together with well preserved glacial sculpture along the coast (mirrowing features on nearby Ellesmere Island) and over 80 m of Holocene emergence, provides convinding evidence that an ice stream, draining from coalesced Greenland and Innuitian Ice Sheets over Kane basin, filled Smith Sound at the last (late-Wisconsian) glacial maximum. Four 14C age determinations have been made on Core 80-18, and the age of the basal organic sediment is 7210 ± 130 conventional radiocarbon years.

The minerogenic sediment in Core 80-18, rich in embedded pollen, is lacking in contemporary algae and zoological remains, whereas their number varies throughout the organic part of the core, giving some indication of climate and trophic fluctuations. In the organic sequence only 20 diatom species were recorded, and of these only five taxa were ever present at greater than trace levels. The diatom assemblage was dominated by small Fragilaria species, typical of early postglacial environments from most glaciated lakes, regardless of location or geologic substrate. Their continued abundance throughout the history of this lake reflects the extreme climate of the region. These harsh concitions are also reflected in the fossil Cladocera (Crustacea). Fragments of mosses occurred throughout the organic sequence; Calliergon giganteum dominated at most levels between 5 and 40 cm. A pollen- and microfossil diagram can be divided into five zones. From the bottom upward they are: A. Poaceae pioneer plant zone; B. Salix arctica – Polypodiaceae zone with many pioneer plants; C. Salix arctica zone with high pollen influx; D. Cyperaceae zone with Dryas, Oxyria and Salix; and E. Saxifraga oppositifoliaPapaver zone with many pioneer (fell-field) plants. In this uppermost zone up to 250 000 Pediatrum/ml indicate a slow sedimentation rate, as do the age determinations, probably caused by the development of a nearly permanent ice cover over the central part of the lake. Detailed analysis of the top 7.6 cm of sediment in a second core revealed drastic changes in the chlorophycean (green algae) fossils. Scenedesmus is dominant below 4.7 cm, whereas Pediastrum is dominant above 4.6 cm. An AMS date of 4050 ± 110 conventional radiocarbon years pinpoints the time a which the cover of lake ice became more permanent.

Customer Reviews

Monograph
By: Weston Blake, Jr.(Author), Mary M Boucherle(Author), Bent Fredskild(Author), Jan A Janssens(Author), John P Smol(Author)
42 pages, illustrations
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