Evidence for the occurrence of Vedde Ash in Sweden: radiocarbon and calendar age estimates
✍ Scribed by Stefan Wastegård; Svante Björck; Göran Possnert; Barbara Wohlfarth
- Publisher
- John Wiley and Sons
- Year
- 1998
- Tongue
- English
- Weight
- 110 KB
- Volume
- 13
- Category
- Article
- ISSN
- 0267-8179
No coin nor oath required. For personal study only.
✦ Synopsis
A tephra layer of rhyolitic composition has been recorded in sediments from Lake Madtja ¨rn, southwestern Sweden. Geochemical analyses have shown that the tephra is identical to the rhyolitic component of the middle Younger Dryas Vedde Ash. A series of AMS radiocarbon measurements places the radiocarbon age of the tephra within a 14 C plateau at 10 400-10 300 14 C y BP. Based on a linear Younger Dryas sedimentation rate and assumptions about the apparent synchroneity of changes in lake sediments, tree rings and ice-core records, the calendar year age of the tephra concentrations is estimated at 12 045-11 975 yr BP, which accords well with the age of the equivalent tephra in the GRIP core.