Weathering rind age assignment of Neoglacial deposits in the Okstindan Mountains, northern Norway

• Autorzy: Mahaney W. C.

Identyfikatory

DOI

10.1515/squa-2016-0013

• Języki publikacji: EN

Abstrakty

EN

Previous soil stratigraphic analysis of soil morphogenesis in the Okstindan Mountains established a Late Neoglacial soil evolutionary sequence based on historically monitored and radiocarbon-dated moraine positions over the last ~3.0 cal yr BP. Thus pedon evolution ranged from C/Cu®Ah/Cox/Cu®pedostratigraphic succession of Ah/C/Cu/Lb/ Cub/Ahb/Coxb/Cub profiles with a maximum rind weathering time of ~1.0 kyr. Following successive retreat phases of Neoglacial ice, weathering rind development continued apace on moraines, each rind population recording weathering time following successive glacier stillstands. The age of the youngest deposits falls within the period 1900–1910 AD, or the last 100 yrs, with variable moraine positions all documented by historical depictions of the position of the Austre Okstindan glacial lobe prior retreating to its present position. The next older group of deposits is considered to have been emplaced near the end of the LIA or around ~1800 AD, with time of rind development set at 200 yr, possibly older. The oldest moraine set within the late Neoglacial sequence lies atop a pedostratigraphic column, the uppermost soil radiocarbon dated at ~1.0 yr BP. Given the range of mean rind development across this threshold of deposits, from 0.22 ±0.03 mm in the inner group, 0.66 ±0.07mm in the middle group, to 1.38 ±0.15 mm in the outer, older group, it is clear that finite measurements at several sites within a suite of deposits, some dated by radiocarbon, can evenly discriminate between deposits in a glacial succession.

Słowa kluczowe

EN

Little Ice Age; Okstindan Neoglacial record; weathering rinds

• Wydawca: Institute of Geological Science Polish Academy of Science
• Czasopismo: Studia Quaternaria
• Rocznik: 2016
• Tom: Vol. 33, Nr 2
• Strony: 131--138
• Opis fizyczny: Bibliogr. 52 poz., tab., rys.

Twórcy

autor

Mahaney W. C.

• Quaternary Surveys, 26 Thornhill Ave., Thornhill, Ontario, Canada, L4J1J4 and Department of Geography, York University, 4700 Keele St., N. York, Ontario, Canada, M3J 1P3

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