Results 51 to 60 of about 1,760 (179)

Rootless tephra stratigraphy and emplacement processes [PDF]

Bulletin of Volcanology, 2017
Volcanic rootless cones are the products of thermohydraulic explosions involving rapid heat transfer from active lava (fuel) to external sources of water (coolant). Rootless eruptions are attributed to molten fuel-coolant interactions (MFCIs), but previous studies have not performed systematic investigations of rootless tephrostratigraphy and grain ...
Hamilton, Christopher W., Fitch, Erin P., Fagents, Sarah A., Thordarson, Thorvaldur   +3 more
openaire   +3 more sources

VOLCANIC EVENTS RECORD OVER THE LAST 900 YEARS FROM SNOW AND FIRN SEQUENCE IN VOSTOK STATION AREA

Лëд и снег, 2015
The results of chemical analyses of snow samples from five pits and cores drilled in the vicinities of Vostok Station, Antarctica, are presented. High resolution (every 2–3 cm, or about three samples per year) ion measurements allowed to compile a new ...
T. V. Hodzher, L. P. Golobokova, E. Yu. Osipov, N. A. Onishchuk, U. G. Filippova, V. Yu. Lipenkov, A. A. Ekaykin   +6 more
doaj   +1 more source

Out in the cold? A review of Early Middle Palaeolithic settlements in northern Central Europe, age data and geological preconditions for site formation and preservation

Boreas, EarlyView.
The characteristics of settlement of Neanderthals in northern Central Europe during the earlier phases of the Middle Palaeolithic (Marine Isotope Stage 8–6) have been a matter of debate for decades, specifically regarding the population dynamics at such latitudes during the coldest phases. In this paper, we review the known archaeological record of the
Gianpiero Di Maida, Jutta Winsemann, Malte Hoffmann, Tobias Lauer, Utz Böhner, Thomas Terberger   +5 more
wiley   +1 more source

Correlation of Papanetu Tephra to Karapiti Tephra, central North Island, New Zealand [PDF]

New Zealand Journal of Geology and Geophysics, 1986
Abstract New road exposures around Lake Rotoaira and south and east of Lake Taupo have provided the opportunity to re‐examine the stratigraphic relationships between the rhyolitic Papanetu and Karapiti Tephras (c. 10 000 years B.P.).
Paul C. Froggatt, Graeme J. Solloway
openaire   +1 more source

Origin and significance of ice‐rafted detritus in the Atlantic sector of the Southern Ocean

Geochemistry, Geophysics, Geosystems, 2007
Piston core TN057‐14 from the eastern Atlantic sector of the Southern Ocean contains several layers rich in volcanic tephra that were deposited during the last glacial period.
Simon H. H. Nielsen, D. A. Hodell, G. Kamenov, T. Guilderson, M. R. Perfit   +4 more
doaj   +1 more source

Refining the timing of Middle Pleistocene (MIS 12 to MIS 6) ice advances into northern central Europe: sedimentological analysis and single‐grain luminescence dating of glaciotectonic complexes and tunnel‐valley fills

Boreas, EarlyView.
We summarize the current state of knowledge on the age of the Middle Pleistocene ice advances into northern central Europe and provide 25 new single‐grain feldspar luminescence ages of Elsterian and Saalian glacigenic sediments to constrain the age of the ice advances and their tentative correlation with marine isotope stages/substages.
Niklas von Soest, Neda Rahimzadeh, Debra Colarossi, Falko Malis, Tobias Lauer, Wera Sander‐Beuermann, Yvonne Spychala, Christian Brandes, Runa Fälber, Sumiko Tsukamoto, Jutta Winsemann   +10 more
wiley   +1 more source

Towards an ‘absolute’ timing of biostratigraphic and environmental phases from the Saalian late glacial to the Weichselian pleniglacial in central Europe—Insights from a lacustrine succession in Lichtenberg, northern Germany

Boreas, EarlyView.
Palynological records are central to the biostratigraphic subdivision of the Late Pleistocene in central Europe. Yet many interglacial and interstadial phases—such as the Eemian, Brörup and Odderade—remain only poorly constrained in time due to limited numerical dating.
Michael Hein, Thomas Kasper, Alexis Badai Samudra, Martin Theuerkauf, Markus Lothar Fischer, Neda Rahimzadeh, Maria Sekar Proborukmi, Sonja Rigterink, Agnieszka Gruszczyńska, Christian Zeeden, Simon Parfitt, David John Horne, Lucy Roberts, Dustin White, Lisa Brogmus, Hans von Suchodoletz, Tobias Lauer, Marcel Weiss, David Colin Tanner, Brigitte Urban   +19 more
wiley   +1 more source

Dispersal, source and glass chemistry of a third tephra unit within Iceland's Settlement Layer

Boreas, EarlyView.
Tephra layers may be studied to understand the dynamics and sequence of past explosive volcanism. In Iceland, the distinctive Settlement Layer (AD ~877) underlies almost all archaeological evidence for the Norse Settlement and is preserved in soils across Iceland and as cryptotephra overseas.
Conner A. G. Morison, Guðrún Larsen, Anthony J. Newton, Andrew J. Dugmore   +3 more
wiley   +1 more source

Tephra occurrence in Alaska: a map-based compilation of stratigraphic tephra data [PDF]

, 2018
The principal hazard associated with future explosive eruptions of Alaska volcanoes is the generation of volcanic ash clouds which are explosively blasted high into the atmosphere and then drift away from the volcano with the wind. The fragments in the ash cloud (tephra) vary in size and the heavier particles fall near the source while finer particles ...
A.K. Worden, J.R. Schaefer, K.M. Mulliken   +2 more
openaire   +1 more source

The Tephras of Yotei Volcano

The Quaternary Research (Daiyonki-Kenkyu), 1976
1) 羊蹄第3軽石・スコリア層 (Yo. Ps-3), 羊蹄第2軽石・スコリア層 (Yo. Ps-2), 羊蹄第1軽石・スコリア層 (Yo. Ps-1) は, 支笏軽石流堆積物 (Spfl) と恵庭a降下軽石層 (En-a) の両層準の間にあり, とくにYo. Ps-1,-3は羊蹄山東麓から札幌-苫小牧低地帯におよぶ広い分布を示す.2) 札幌-苫小牧低地帯の周辺では, Yo. Ps-1とYo. Ps-3は, 従来恵庭火山起源のものと考えられてきたが, Yo. Ps-1,-2,-3はいずれも羊蹄火山起源であることをあきらかにすることができた.3) Yo. Ps-3の分布は, 羊蹄火山を西端とする長楕円形で分布軸の方向はほぼ真東であり, 75km以遠におよぶ.
KASHIWABARA, Makoto, HIROSE, Yasushi, KAGAWA, Masahito, KAN, Keiichi, KASUGAI, Akira, YAMAGISHI, Kazuo   +5 more
openaire   +3 more sources