Results 21 to 30 of about 5,095 (245)

Geomorphology of the Central Kamchatka Depression, the Kamchatka Peninsula, NE Pacific

Journal of Maps, 2023
The Kamchatka Peninsula lies on the eastern active margin of Eurasia, adjacent to the Kuril-Kamchatka subduction zone. In this study, we provide a geomorphological map of the Central Kamchatka Depression – the largest sedimentary basin in Kamchatka and ...
E. Zelenin, A. Gurinov, S. Garipova, A. Zakharov   +3 more
doaj   +1 more source

Dating peat profiles using tephra: stratigraphy, geochemistry and chronology [PDF]

Mires and Peat, 2010
In this article we provide a brief overview of the protocols for dating peat profiles using tephrochronology. A standardised methodology for the detection, extraction and analysis of tephras is presented and the relevant problems and limitations are ...
G.T. Swindles, F. De Vleeschouwer, G. Plunkett   +2 more
doaj   +2 more sources

Smoking guns and volcanic ash: the importance of sparse tephras in Greenland ice cores

Polar Research, 2020
Volcanic ash (fine-grained tephra) within Greenland ice cores can complement the understanding of past volcanism and its environmental and societal impacts.
Gill Plunkett, Michael Sigl, Jonathan R. Pilcher, Joseph R. McConnell, Nathan Chellman, J.P. Steffensen, Ulf Büntgen   +6 more
doaj   +1 more source

First discovery of Holocene cryptotephra in Amazonia. [PDF]

Sci Rep, 2015
The use of volcanic ash layers for dating and correlation (tephrochronology) is widely applied in the study of past environmental changes. We describe the first cryptotephra (non-visible volcanic ash horizon) to be identified in the Amazon basin, which ...
Watson EJ, Swindles GT, Savov IP, Bacon KL.   +3 more
europepmc   +3 more sources

Cosmogenic helium signatures at Deception Island volcano (Antarctica): geochronological implications for its eruptive history. [PDF]

Sci Rep
Cosmogenic nuclei production for dating the Earth surface exposure of rock/mineral samples, especially 3He, is a robust technique in geochronology. We describe its application to constrain the ages of key eruptive episodes of the volcanic history of ...
Álvarez-Valero AM, Sumino H, Burgess R, Arribas L, Polo-Sánchez A, Geyer A, Caracausi A, Albert H, Aulinas M, Ban M, Borrajo J, García-Arias M, Ichikawa G, Kereszturi G, Rodríguez JAL.   +14 more
europepmc   +2 more sources

Chronological Assessment of the Balta Alba Kurgan Loess-Paleosol Section (Romania) – A Comparative Study on Different Dating Methods for a Robust and Precise Age Model

Frontiers in Earth Science, 2021
Loess-paleosol sequences (LPSs) are important terrestrial archives of paleoenvironmental and paleoclimatic information. One of the main obstacles for the investigation and interpretation of these archives is the uncertainty of their age-depth ...
Stephanie Scheidt, Sonja Berg, Ulrich Hambach, Ulrich Hambach, Nicole Klasen, Stephan Pötter, Alexander Stolz, Daniel Veres, Christian Zeeden, Dominik Brill, Helmut Brückner, Stephanie Kusch, Christian Laag, Christian Laag, Frank Lehmkuhl, Martin Melles, Florian Monnens, Lukas Oppermann, Janet Rethemeyer, Janina J. Nett   +19 more
doaj   +1 more source

Detection and Characterisation of Eemian Marine Tephra Layers within the Sapropel S5 Sediments of the Aegean and Levantine Seas

Quaternary, 2020
The Eemian was the last interglacial period (~130 to 115 ka BP) to precede the current interglacial. In Eastern Mediterranean marine sediments, it is marked by a well-developed and organic-rich “sapropel” layer (S5), which is thought to ...
Christopher Satow, Katharine M. Grant, Sabine Wulf, Hartmut Schulz, Addison Mallon, Ian Matthews, John Lowe   +6 more
doaj   +1 more source

The Medial Offshore Record of Explosive Volcanism Along the Central to Eastern Aegean Volcanic Arc: 2. Tephra Ages and Volumes, Eruption Magnitudes and Marine Sedimentation Rate Variations

Geochemistry, Geophysics, Geosystems, 2021
We use the tephrostratigraphic framework along the Aegean Volcanic Arc established in Part 1 of this contribution to determine hemipelagic sedimentation rates, calculate new tephra ages, and constrain the minimum magnitudes of (sub)plinian eruptions of ...
S. Kutterolf, A. Freundt, T. H. Druitt, J. McPhie, P. Nomikou, K. Pank, J. C. Schindlbeck‐Belo, T. H. Hansteen, S. R. Allen   +8 more
doaj   +1 more source

Hiroshi Machida −respected tephrochronologist, teacher, leader [PDF]

, 2011
Professor Emeritus Hiroshi Machida (Hiroshi hereafter) is the leading tephrochronologist of his generation in Japan. Perhaps more than any other geoscientist from Japan, Hiroshi carried the insights and advances of tephra studies and their application in
Lowe, David J., Moriwaki, Hiroshi, Suzuki, Takehiko   +2 more
core   +2 more sources

Holocene record of large explosive eruptions from Chaitén and Michinmahuida Volcanoes, Chile

Andean Geology, 2013
Tephra fall deposits and one large ignimbrite close to Chaitén and Michinmahuida Volcanoes were analyzed for chemistry and radiocarbon dated to correlate the eruptive units and establish the timing of eruptions.
Álvaro Amigo, Luis E. Lara, Victoria C. Smith   +2 more
doaj   +1 more source