Open AccessA little goes a long way: discovery of a new mid‐Holocene tephra in Sweden
Author(s) -
BOYGLE JANE
Publication year - 1998
Publication title -
boreas
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.95
H-Index - 74
eISSN - 1502-3885
pISSN - 0300-9483
DOI - 10.1111/j.1502-3885.1998.tb00878.x
Subject(s) - tephra , geology , electron microprobe , shetland , volcano , tephrochronology , electron probe microanalysis , holocene , geochemistry , volcanic glass , volcanic ash , pumice , mineralogy , volcanic rock , paleontology , oceanography
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 14 C 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 SiO 2 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 14 C BP) on the basis of calcium and magnesium contents.