Results 41 to 50 of about 9,430 (230)

The formation of tephra layers in peatlands: An experimental approach [PDF]

, 2010
Tephrochronology provides a valuable method of dating peat deposits but results may be compromised if tephra undergoes significant post-depositional movement.
Gehrels, Maria, Payne, Richard
core   +1 more source

Identification and correlation of the Aso‐3 tephra in the Omaezaki area, central Japan: A valuable key stratum for the MIS 6/5 transition period

Journal of Quaternary Science, EarlyView.
ABSTRACT The Aso‐3 tephra is one of the most significant widespread marker layers from the Middle to Late Pleistocene, generated by a large caldera‐forming eruption at the Aso volcano in Kyushu, southwestern Japan. Despite its importance, a distal co‐ignimbrite ash correlative has yet to be clearly identified, primarily because although volcanic glass ...
Toshinori Sasaki, Takuya Morimoto, Tatsuyuki Ueno, Kazuo Mizoguchi, Norihisa Goto, Hisanori Ominami, Shohei Onaka   +6 more
wiley   +1 more source

Mortars From Punic and Hellenistic–Roman Solunto: Materials, Formulations, and Technology

Archaeometry, EarlyView.
ABSTRACT This study presents an archaeometric investigation of 18 hydraulic rendering and bedding mortars from Punic and Hellenistic–Roman Solunto (NW Sicily). The research aimed to characterize raw materials, reconstruct manufacturing sequences, and evaluate technological proficiency through mineralogical and petrochemical analyses.
G. Montana, G. Polizzi, C. Portale, M. Gasparo Morticelli, L. Randazzo   +4 more
wiley   +1 more source

The Contributions of Marine Sediment Cores to Volcanic Hazard Assessments: Present Examples and Future Perspectives

Geosciences, 2023
The rigorous assessment of volcanic hazards relies on setting contemporary monitoring observations within an accurate, longer-term geological context. Revealing that geological context requires the detailed fieldwork, mapping and laboratory analysis of ...
Chris Satow, Sebastian Watt, Mike Cassidy, David Pyle, Yuqiao Natalie Deng   +4 more
doaj   +1 more source

Marine tephrochronology: a personal perspective

, 2014
This special volume on marine tephrochronology is remarkable, and timely, because it marks a concerted step towards what might be informally termed ‘phase 3’ of a revolution in Quaternary geosciences that began around 40 years ago.
Lowe, David J., David J. Lowe
core   +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

Petrographic Characterization of the Tephras in the Lowermost to Lower Members of Daisen Tephra Formations.

The Quaternary Research (Daiyonki-Kenkyu), 2002
これまでに屈折率の測定されていない大山最下部火山灰と下部火山灰にはさまれるテフラについて,残存する斜方輝石,角閃石,カミングトン閃石の屈折率を測定した.またDMPについては,ごくわずかに斑晶に付着するガラスの屈折率を測定した.最下部火山灰を構成する各テフラは,鉱物組成,斜方輝石および角閃石の屈折率から,それぞれ識別できる.最下部火山灰cpmおよびhpm1のフィッション・トラック年代と,琵琶湖湖底堆積物中の大山火山起源とされるBT44-49火山灰層群の推定堆積年代との対比から,BT44-49火山灰層群の一部は,大山最下部火山灰に対比できる可能性があり,BT44-49火山灰の角閃石および斜方輝石の屈折率が明らかになれば,両地点におけるテフラの対比を検討することが可能と考える.
Furusawa, Akira, Umeda, Koji
openaire   +2 more sources

Late Holocene palynology and palaeovegetation of tephra-bearing mires at Papamoa and Waihi Beach, western Bay of Plenty, North Island, New Zealand.

, 1995
The vegetation history of two mires associated with Holocene dunes near the western Bay of Plenty coast, North Island, New Zealand, is deduced from pollen analysis of two cores.
Wigley, G.N.A., G. N. A. Wigley, D. J. Lowe, Lowe, David J., R. M. Newnham, Newnham, Rewi M.   +5 more
core   +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

Rapid Tephra Identification in Geological Archives With Computed Tomography: Experimental Results and Natural Applications

Frontiers in Earth Science, 2021
Volcanic ash (tephra) horizons represent powerful chronological and stratigraphic markers: rapid and widespread deposition allows for correlation of geological records in time and space.
Willem G. M. van der Bilt, Willem G. M. van der Bilt, Jan Magne Cederstrøm, Eivind W. N. Støren, Eivind W. N. Støren, Sarah M. P. Berben, Sarah M. P. Berben, Sunniva Rutledal, Sunniva Rutledal   +8 more
doaj   +1 more source