Results 11 to 20 of about 5,095 (245)

High-resolution stalagmite stratigraphy supports the Late Holocene tephrochronology of southernmost Patagonia

Communications Earth & Environment, 2021
Volcanic ash layers are important markers for the chronostratigraphy of paleoclimate and paleoenvironmental archives at the southern tip of South America. However, this requires that tephras are well-dated.
B. Klaes, G. Wörner, K. Kremer, K. Simon, A. Kronz, D. Scholz, C. Mueller, C. Höschen, J. Struck, H. Arz, S. Thiele‐Bruhn, D. Schimpf, R. Kilian   +12 more
semanticscholar   +2 more sources

Tephrochronology and Provenance of an Early Pleistocene (Calabrian) Tephra From IODP Expedition 374 Site U1524, Ross Sea (Antarctica)

Geochemistry, Geophysics, Geosystems, 2021
We present a full characterization of a 20 cm‐thick tephra layer found intercalated in the marine sediments recovered at Site U1524 during International Ocean Discovery Program (IODP) Expedition 374, in the Ross Sea, Antarctica.
A. Di Roberto, B. Scateni, G. Di Vincenzo, M. Petrelli, G. Fisauli, S. Barker, P. Del Carlo, F. Colleoni, D. Kulhanek, R. McKay, L. De Santis, The IODP Expedition 374 Scientific   +11 more
semanticscholar   +2 more sources

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

Using Soil Stratigraphy and Tephrochronology to Understand the Origin, Age, and Classification of a Unique Late Quaternary Tephra-Derived Ultisol in Aotearoa New Zealand

Quaternary, 2019
In this article, I show how an Ultisol, representative of a globally-important group of soils with clay-rich subsoils, low base saturation, and low fertility, in the central Waikato region in northern North Island, can be evaluated using soil ...
D. Lowe
semanticscholar   +3 more sources

Marine tephrochronology: a personal perspective [PDF]

Geological Society, London, Special Publications, 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. The 10 articles collectively represent a re-focussed examination of tephras and cryptotephras preserved in ocean sediments
Lowe, David J.
openaire   +5 more sources

Cryptotephras in the marine sediment record of the Edisto Inlet, Ross Sea: Implications for the volcanology and tephrochronology of northern Victoria Land, Antarctica

Quaternary Science Advances, 2023
We present the results of the tephrochronology study of a 14.49 m long marine sediment core (TR 17–08) collected in the Edisto Inlet, Ross Sea (Antarctica).
A. Di Roberto, G. Re, B. Scateni, M. Petrelli, T. Tesi, L. Capotondi, C. Morigi, G. Galli, E. Colizza, R. Melis, F. Torricella, P. Giordano, F. Giglio, Andrea Gallerani, K. Gariboldi   +14 more
semanticscholar   +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