Results 51 to 60 of about 9,430 (230)
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 +5 more
openaire +3 more sources
Tephrochronology and its application: A review
, 2011 Tephrochronology (from tephra, Gk ‘ashes’) is a unique stratigraphic method for linking, dating, and synchronizing geological, palaeoenvironmental, or archaeological sequences or events.
Lowe, David J., David J. Lowe
core +1 more source
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 +19 more
wiley +1 more source
Journal of Maps, 2021 Soils of the Upper Volturno basin in the Central-Southern Apennines (Molise, Italy) were surveyed in detail. Trends in development are described with focus on the contrast between the mountain soils and the soils of the basin.
R. H. van Otterloo, J. Sevink
doaj +1 more source
Tephra transformations: variable preservation of tephra layers from two well-studied eruptions [PDF]
Bulletin of Volcanology, 2018 Volcanologists often use terrestrial tephra layers to reconstruct volcanic eruptions. However, the conversion of fresh tephra deposits into tephra layers is poorly understood. To address this knowledge gap, we surveyed tephra layers emplaced by the 1980 eruption of Mount St Helens, USA (MSH1980) and the 1947 eruption of Hekla, Iceland (H1947).
Cutler NA +5 more
openaire +4 more sources
Meteoritics &Planetary Science, EarlyView.Abstract Within the Danian Scaglia Rossa Formation appears a regionally correlatable horizon cutting across multiple sections and outcrops within the Umbria–Marche Basin of NE Italy, where it is intercalated with uniform pelagic carbonate successions. This horizon is called “ALE layer” and has tentatively been interpreted as a fine‐grained volcanic ash.
Toni Schulz +5 more
wiley +1 more source
Geochemistry, Geophysics, Geosystems, 2023 Alaska contains over 130 volcanoes and volcanic fields that have been active within the last 2 million years. Of these, roughly 90 have erupted during the Holocene, with many characterized by at least one large explosive eruption.
Jordan Lubbers +4 more
doaj +1 more source
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. +3 more
openaire +3 more sources
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 +4 more
doaj +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