Results 21 to 30 of about 771 (201)

Tephrochronology at Sites 502 and 503

, 1982
Michael T. Ledbetter
openaire   +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. J. Barker, P. Del Carlo, F. Colleoni, D. K. Kulhanek, R. McKay, L. De Santis, The IODP Expedition 374 Scientific Party   +11 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

Probabilistic Source Classification of Large Tephra Producing Eruptions Using Supervised Machine Learning: An Example From the Alaska‐Aleutian Arc

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, Matthew Loewen, Kristi Wallace, Michelle Coombs, Jason Addison   +4 more
doaj   +1 more source

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

Holocene carbon accumulation in the peatlands of northern Scotland [PDF]

Mires and Peat, 2018
The response of peatland carbon accumulation to climate can be complex, with internal feedbacks and processes that can dampen or amplify responses to external forcing.
J.L. Ratcliffe, R.J. Payne, T.J. Sloan, B. Smith, S. Waldron, D. Mauquoy, A. Newton, A.R. Anderson, A. Henderson, R. Andersen   +9 more
doaj   +1 more source

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

Radiocarbon Dating and Tephrochronology in Kamchatka [PDF]

Radiocarbon, 1993
We discuss results of 14C dates obtained from areas of young volcanoes in Kamchatka. We apply these dates to reconstructing regional volcanic activity during the Holocene.
Braitseva O.A., Sulerzhitsky L.D., Litasova S.N., Melekestsev I.V., Ponomareva V.V.   +4 more
openaire   +2 more sources

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

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