A little goes a long way: discovery of a new mid-Holocene tephra in Sweden |
| |
| Authors: | JANE BOYGLE |
| |
| Institution: | Department of Environmental and Geographical Sciences, John Dalton Extension Building, Chester Sr. Manchester, MI 5GD, UK |
| |
| Abstract: | This pilper reports the presence of a volcanic ash layer in western Sweden which is geochemically identiticd as the Kebister tephra. This tephrdpresenceof (dated c . 3600 14C BP) was discovered at Kebister, Shetland and thc rcsults presented here indicate that the deposit may have a greater geographical distribution than previously thought. The geochemistry of the volcanic glass was analysed by using discrete grain electron probe microanalysis (EPMA). Thc SiO2 content of the glass ranges from 66.19 to 71.96%, FeO content 2.73 to 6.07% and MgO content 0.15 to 0.57%? The tephra can he distinguished from the more widespread Hekla 4 tephra ( c . 3800 14C BP) on the basis of calcium and magnesium contents. |
| |
| Keywords: | |
|
|
