Weathering processes and Quaternary origin of an alpine blockfield in Arctic Sweden
2009 (English)In: Boreas, ISSN 0300-9483, Vol. 38, no 2, 379-398 p.Article in journal (Refereed) Published
The weathering and origin of an autochthonous blockfield in the northern Swedish mountains were investigatedthrough an examination of fine matrix and clasts from two pits excavated across ridge-top sorted circles; one on asummit, the other in a saddle. At the summit, fine matrix chemical weathering is limited to the production of poorlycrystallized Al- and Fe-oxyhydroxides, whereas some additional vermiculitization and gibbsite crystallization occursin the saddle. In both locations, volumes of clay-sized matrix are low, mass balance calculations indicate onlyminor elemental losses and no chemically etched grains are visible under a scanning electron microscope (SEM). Inaddition, soil horizons are absent and chemical weathering intensity is uniformly low across both excavated sortedcircles. Minor clast chemical weathering consists of Fe oxidation, which dominates in the matrix-rich circle centres,and some rind development, which increases in frequency in the clast-rich rings. The dominance of physicalweathering processes and the presence of only minor chemical weathering, in both fine matrix and clasts, indicatethat the blockfield is not a Neogene weathering remnant. Rather, the blockfield has a Quaternary origin, developingduring interglacials, interstadials and the Holocene, primarily through subsurface weathering processes.
Place, publisher, year, edition, pages
Wiley Interscience , 2009. Vol. 38, no 2, 379-398 p.
Research subject Physical Geography
IdentifiersURN: urn:nbn:se:su:diva-26927DOI: 10.1111/j.1502-3885.2008.00061.xISI: 000264563700013OAI: oai:DiVA.org:su-26927DiVA: diva2:211853
The Swedish Society for Anthropology and Geography
Andréefonden, Axel Lagrelius Fond and Carl Mannerfelts Fond provided funding to Goodfellow, and Swedish Research Council grant 621-2005-4972 provided funding to Stroeven.2009-04-202009-04-202009-04-20Bibliographically approved