Results 11 to 20 of about 771 (201)

Offshore Record of Explosive Volcanic Eruptions in the Southern Part of the Panamá Basin During the Past 10 Myr: 2. Inferences About the Construction of the Northern Andean Arc and Regional Geodynamics

Geochemistry, Geophysics, Geosystems
Volcanic material preserved in marine and lacustrine sediments is a key high‐resolution archive for studying the past eruptive history of volcanic regions.
Mathilde Bablon, Pablo Samaniego, Jean‐Luc Le Pennec, François Nauret, François Michaud, Marianne Saillard, Silvana Hidalgo, Jean‐Luc Devidal, François Orange, Céline Liorzou, Gueorgui Ratzov   +10 more
doaj   +2 more sources

Offshore Record of Explosive Volcanic Eruptions in the Southern Part of the Panamá Basin During the Past 10 Myr: 1. Tephrostratigraphy, Cross‐Correlations and Geochemical Characterization

Geochemistry, Geophysics, Geosystems
Northern Andean volcanism is characterized by an intense Quaternary activity, whose onshore deposits have partly covered Mio‐Pliocene products associated with the early development of the arc, making it difficult to obtain an exhaustive catalog of past ...
Mathilde Bablon, Marianne Saillard, François Michaud, François Nauret, Pablo Samaniego, Jean‐Luc Le Pennec, Silvana Hidalgo, Gueorgui Ratzov, Jean‐Luc Devidal, François Orange, Céline Liorzou   +10 more
doaj   +2 more sources

Tephrochronology in faulted Middle Pleistocene tephra layer in the Val d’Agri area (Southern Italy)

Annals of Geophysics, 2006
The High Agri River Valley is a Quaternary Basin located along the hinge of the Southern Apennines fold-andthrust belt. The inner margin of the orogen has been affected by intense transtensional and normal faulting, which accompanied vigorous volcanism ...
L. Ferranti, L. Maschio, D. Insinga, P. Burrato, D. B. Karner, G. D’Addezio, P. R. Renne   +6 more
doaj   +3 more sources

Millennium-scale changes in mire vegetation reconstructed from plot-based pollen and vegetation analysis and their implications for conservation [PDF]

Mires and Peat, 2023
Historical perspective helps ecologists and conservationists to better understand modern processes and potential future changes, but collecting long-term ecological data with fine spatiotemporal resolution is challenging.
Chuh Yonebayashi
doaj   +1 more source

Holocene Marine Tephra Offshore Ecuador and Southern Colombia: First Trench‐to‐Arc Correlations and Implication for Magnitude of Major Eruptions

Geochemistry, Geophysics, Geosystems, 2022
Tephra layers preserved in marine sediments are strong tools to study the frequency, magnitude and source of past major explosive eruptions. Thirty‐seven volcanoes from the Ecuadorian and Colombian arc, in the northern Andes, experienced at least one ...
Mathilde Bablon, Gueorgui Ratzov, François Nauret, Pablo Samaniego, François Michaud, Marianne Saillard, Jean‐Noël Proust, Jean‐Luc Le Pennec, Jean‐Yves Collot, Jean‐Luc Devidal, François Orange, Céline Liorzou, Sébastien Migeon, Silvia Vallejo, Silvana Hidalgo, Patricia Mothes, Miguel Gonzalez   +16 more
doaj   +1 more source

Machine Learning Applied to K-Bentonite Geochemistry for Identification and Correlation: The Ordovician Hagan K-Bentonite Complex Case Study

Geosciences, 2021
Altered tephras (K-bentonites) are of great importance for calibration of the geologic time scale, for local, regional, and global correlations, and paleoenvironmental reconstructions.
Achim D. Herrmann, John T. Haynes, Richard M. Robinet, Norlene R. Emerson   +3 more
doaj   +1 more source

Global tephra studies: role and importance of the international tephra research group “Commission on Tephrochronology” in its first 60 years [PDF]

History of Geo- and Space Sciences, 2022
Tephrochronology is a correlational and age-equivalent dating method whereby practitioners characterize, map, and date tephra (or volcanic ash) layers and use them stratigraphically as connecting and dating tools in the geosciences (including volcanology)
D. J. Lowe, P. M. Abbott, P. M. Abbott, T. Suzuki, B. J. L. Jensen   +4 more
doaj   +1 more source

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