The "Lund Moraine" - the geomorphic limit of the last Young Baltic ice advance in the ?resund region

GFF(2023)

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摘要
Here we present geomorphological evidence of a previously unrecognised similar to 50 km long, ice-marginal moraine complex in southwestern Skane, southernmost Sweden, which we name the "Lund Moraine". This lobate moraine marks a sharp boundary between heavily streamlined and gently undulating landscapes, and closely outlines the extent of the "Lund till/diamicton". We interpret that the moraine was formed by a northward readvance, corresponding to a last Young Baltic readvance of the Scandinavian Ice Sheet into oresund. Consequently, we infer that the "Lund till/diamicton" was formed subglacially, in contrast to earlier interpretations of it being a waterlain diamicton. Based on previously published dates, stratigraphically below "Lund till/diamicton", we infer that this readvance occurred sometime after c. 16 cal. ka BP. This readvance could offer an explanation to the apparent discrepancy of observations of the postglacial marine limit from outside and inside the Lund Moraine. Our observations will hopefully settle the similar to 50 years long controversy concerning the extent or even existence of such a readvance into oresund. We expect that our findings will guide further work towards disentangling the complex deglacial history of Skane and the wider oresund region.
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关键词
Scandinavian Ice Sheet,Fennoscandian ice sheet,Low Baltic ice stream,Young Baltic ice stream,deglaciation,Skane,LiDAR
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