Holocene tephra formations erupted in the Taupo area, and interbedded tephras from other volcanic sources
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A Holocene tephra record from the Lofoten Islands, Arctic Norway
A tephrochronology has been established for a peat bog in the Lofoten Islands that provides a dating framework for future lake and bog studies of climate variation in this climatically sensitive area. Twenty-three tephra layers were identified, all apparently of Icelandic origin. These included the historically dated tephras of AD 1875 (Askja), AD 1362 (Öraefajökull), AD 1158 (Hekla), AD 1104 (...
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[1] Sediment gravity cores collected from the Pacific seafloor offshore Central America contain numerous distal ash layers from plinian-type eruptions at the Central American Volcanic Arc dating back to more than 200 ka. In part 1 of this contribution we have correlated many of those ash layers between cores and with 26 tephras on land. The marine ash layers cover areas of up to 10 km in the Pa...
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Introduction: Water-magma, or ice-magma, interactions have long been theorized as an important process in the Martian geologic record [1-3]. The ability to unambiguously recognize tephra deposits and volcanic edifices produced by H 2 O-magma interactions is important for understanding the geologic history of Mars and for understanding the genesis of the major components of the Martian surface l...
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Twenty piston cores were collected from water depths of ∼650–3300 m from offshore Bay of Plenty, North Island, New Zealand. They contain tephra from 11 Okataina Volcanic Centre and 4 Taupo Volcanic Centre rhyolite eruptions during the last ∼50 kyr that produce a tephrostratigraphic framework across the tectonically and volcanically complex region of southern Havre Trough, Alderman Trough and th...
متن کاملDetection of Tephra Layers in Antarctic Sediment Cores with Hyperspectral Imaging
Tephrochronology uses recognizable volcanic ash layers (from airborne pyroclastic deposits, or tephras) in geological strata to set unique time references for paleoenvironmental events across wide geographic areas. This involves the detection of tephra layers which sometimes are not evident to the naked eye, including the so-called cryptotephras. Tests that are expensive, time-consuming, and/or...
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ژورنال
عنوان ژورنال: New Zealand Journal of Geology and Geophysics
سال: 1973
ISSN: 0028-8306,1175-8791
DOI: 10.1080/00288306.1973.10431394