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Revisiting the Borrobol Tephra
Boreas, 2016The Borrobol Tephra has been identified as one of the key tephra horizons for the Lateglacial time period but it also exemplifies many of the promises and problems of tephrochronology. Additional horizons with similar major element composition and approximately the same age have been identified around the North Atlantic region.
Lind E. M. +3 more
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1981
A dark tephra layer, named “a”, is found in soils in East and Northeast Iceland. Its volume is approximately 2 km3 and it covers about 40% of Iceland. An isopach map and grain-size study suggests that the tephra deposit forms a distinctly two-lobed layer and was erupted in the year 1477 from the central volcano Kverkfjoll, at the northern margin of ...
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A dark tephra layer, named “a”, is found in soils in East and Northeast Iceland. Its volume is approximately 2 km3 and it covers about 40% of Iceland. An isopach map and grain-size study suggests that the tephra deposit forms a distinctly two-lobed layer and was erupted in the year 1477 from the central volcano Kverkfjoll, at the northern margin of ...
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A second tephra isochron for the Younger Dryas period in northern Europe: The Abernethy Tephra
Quaternary Geochronology, 2015Abstract Visible and non-visible (cryptotephra) volcanic ash layers are increasingly being used to underpin the chronology and high-precision correlation of sequences dating to the last glacial–interglacial transition (LGIT). As the number of sediment records analysed for tephra content rises, and methodological developments permit the detection ...
A. MacLeod +4 more
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1984
The transport modes of subaerial fallout tephra are (1) by ballistic trajectory and (2) by turbulent suspension. Energy is supplied initially to fragments by the eruption and later by wind. Tephra that falls from the atmosphere onto land is called subaerial fallout or airfall tephra.
Richard V. Fisher, Hans-Ulrich Schmincke
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The transport modes of subaerial fallout tephra are (1) by ballistic trajectory and (2) by turbulent suspension. Energy is supplied initially to fragments by the eruption and later by wind. Tephra that falls from the atmosphere onto land is called subaerial fallout or airfall tephra.
Richard V. Fisher, Hans-Ulrich Schmincke
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1981
Tephra studies would benefit greatly from the development of simple, inexpensive, approximate-dating methods that would allow us to estimate the age of a tephra sample in the field office. Colleagues outside the discipline, whose main interest in tephra layers lie in the dates they represent, would benefit also.
openaire +1 more source
Tephra studies would benefit greatly from the development of simple, inexpensive, approximate-dating methods that would allow us to estimate the age of a tephra sample in the field office. Colleagues outside the discipline, whose main interest in tephra layers lie in the dates they represent, would benefit also.
openaire +1 more source