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Varved glaciomarine clay in central Sweden before and after the Baltic Ice Lake drainage: a further clue to the drainage events at Mt Billingen
Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för geologi och geokemi.
Vise andre og tillknytning
2013 (engelsk)Inngår i: GFF, ISSN 1103-5897, E-ISSN 2000-0863, Vol. 135, nr 3-4, s. 293-307Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Glaciomarine clay found west of Mt Billingen, central Sweden, contains two distinct varve units separated by a sand layer that we interpret to be sediment deposited in the North Sea during the catastrophic drainage of the Baltic Ice Lake (BIL). The lower varve series was deposited proximal to the retreating ice margin and consists of varves that grade upward from gray to red. The upper varve series was deposited after the drainage event when fresh water within the Baltic basin flowed westward north of Billingen; the upper varves grade from red to gray. Grain size, elemental composition (determined by X-ray fluorescence (XRF)), iron and organic-carbon content vary within each varve, with values that grade upward through each varve, but with a sharp contact with the overlying varve. The two varve units differ from each other, with the lower sequence being coarser and the upper containing a higher iron and organic-carbon content. We attribute the differences between pre- and post-drainage varves to reflect changes in distance to the ice margin and provenance. The stratigraphy at the site suggests that the BIL drainage lasted <1 year. Lithostratigraphic correlations to the Lake Langen basin west of Mt Billingen support the idea of glacier ice in the Langen basin during the drainage and a retreat and advance of the ice sheet during Allerod and Younger Dryas, including the possibility of an earlier, Allerod drainage.

sted, utgiver, år, opplag, sider
2013. Vol. 135, nr 3-4, s. 293-307
Emneord [en]
varved clay, Baltic Ice Lake drainage, marine varves, Quaternary, Sweden, lithostratigraphy
HSV kategori
Identifikatorer
URN: urn:nbn:se:su:diva-98294DOI: 10.1080/11035897.2013.819032ISI: 000327571800009OAI: oai:DiVA.org:su-98294DiVA, id: diva2:683913
Merknad

AuthorCount:5;

Tilgjengelig fra: 2014-01-07 Laget: 2014-01-03 Sist oppdatert: 2017-12-06bibliografisk kontrollert

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