Fletta eftir efnisorði "Cryptotephra"

Atriði 1-3 af 3

First identification and characterization of Borrobol-type tephra in the Greenland ice cores: new deposits and improved age estimates

Cook, Eliza; Davies, Siwan M.; Guðmundsdóttir, Esther Ruth; Abbott, Peter M.; Pearce, Nicholas J. G. (Wiley-Blackwell, 2018-02)

Contiguous sampling of ice spanning key intervals of the deglaciation from the Greenland ice cores of NGRIP, GRIP and NEEM has revealed three new silicic cryptotephra deposits that are geochemically similar to the well‐known Borrobol Tephra (BT). The ...
Hekla 1947, 1845, 1510 and 1158 tephra in Finland: challenges of tracing tephra from moderate eruptions

Kalliokoski, Maarit; Guðmundsdóttir, Esther Ruth; Wastegård, Stefan (Wiley, 2020-07-04)

Several cryptotephra layers that originate from Icelandic volcanic eruptions with a volcanic explosivity index (VEI) of ≤ 4 and tephra volumes of < 1 km3 have previously been identified in Northern Europe, albeit within a restricted geographical area. ...
An outline for Finnish Holocene tephrochronology: volcanic ash as a dating method in Finland

Kalliokoski, Maarit (University of Turku; University of Iceland, School of Engineering and Natural Sciences, Faculty of Earth Sciences, 2020-11-13)

Tephrochronology is a high-precision dating method that uses volcanic ash horizons as isochrons in correlating and dating geological records and archaeological sites. First developed in the volcanic regions of the world, tephrochronology has expanded ...

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