Results 171 to 180 of about 771 (201)

Bayesian tools for tephrochronology

The Holocene, 2003
It is suggested that Bayesian statistical methods for radiocarbon data interpretation, already widely used in archaeology, also have potential to improve the dating of tephra layers and hence enhance their use for tephrochronology. By re-analysing data from a recently published paper in which the authors sought to identify the calendar date of the ...
Buck, Caitlin E., Higham, Thomas F.G., Lowe, David J.   +2 more
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Tephrochronological studies in northern England

The Holocene, 1996
Tephrostratigraphic investigations of two upland blanket bogs in northern England show that micro scopic layers of tephra are present. Their geochemistry shows that they are identical to two Icelandic tephra layers of known age found at sites in Scotland and the north of Ireland.
Jonathan R. Pilcher, Valerie A. Hall
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Tephrochronology

The word “tephra” is an all-encompassing term for the explosively erupted, pyroclastic (fragmental) products of a volcanic eruption. Since the early pioneering work of Thorarinsson and others, the value of tephras in providing time-parallel marker horizons or isochrons is now well understood.
Alloway, B. V., Lowe, D. J., Jensen, B. J. L., Plunkett, G.   +3 more
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Tephrochronology of the Toluca Basin, central Mexico

Quaternary Science Reviews, 1999
Abstract The major element glass geochemistry of 10 Late Pleistocene and Holocene tephras found in the Toluca Basin in the Trans-Mexican Volcanic Belt is reported for the first time, as a key step towards establishing a tephrochronology for the region.
Anthony J. Newton, Sarah E. Metcalfe
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About this title ‐ Marine Tephrochronology

Geological Society, London, Special Publications, 2014
This Special Publication includes articles presenting recent advances in marine tephrochronological studies and outlines innovative techniques in geochemical fingerprinting, stratigraphy and the understanding of depositional processes. It represents a significant resource for the palaeoceanographic community at a time when marine ...
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Tephrochronology: a New Zealand case study

Earth-Science Reviews, 2000
Abstract Tephrochronology is the study of volcanic ash (tephra) beds for the purpose of correlating and dating volcanic and other geologic events. Large magnitude silicic eruptions can disperse tephra up to thousands of kilometres from the vent, producing a near instantaneous marker horizon.
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Tephrochronology by Microprobe Glass Analysis

1981
Basaltic tephra layers form a considerable part of the postglacial tephra deposits in Iceland. They can be related to the volcanic systems that produced them by characteristics based on major and minor element chemistry. Microprobe analysis of volcanic glass shards have made it possible to relate even very thin (1–2 mm) basaltic tephra layers in distal
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Quaternary Tephrochronology in the Mediterranean Region

1981
Quaternary volcanism in the Mediterranean region was highly explosive, especially in the Roman-Campanian province, the Aeolian Islands and the Hellenic island arc. Pantelleria and Etna were less explosive. Tephra layers originating from all of these volcanoes have been encountered in Quaternary sediments.
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Tephrochronology and Palaeoecology: The Value of Isochrones

1981
The applications of tephrochronology to the correlation of temporally similar yet spatially disjunct flora and fauna are discussed, using as examples recent work in Iceland and Kenya. The paucity of such studies is noted and its relevance to studies in palaeoecology and island biogeography commented upon.
P. C. Buckland, P. Foster, D. W. Perry, D. Savory   +3 more
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The Application of Tephrochronology in Iceland

1981
The situation in Iceland for establishing a tephrochronological time scale is very good. This is due to the great number of volcanic eruptions in post glacial time, a great range of variation in chemistry between tephra layers, a rapid thickening of the soil, separating layers with small age difference, and the existence of detailed accounts of many ...
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