Results 61 to 70 of about 9,073 (173)

The Hidden Internal Flow Dynamics of Shear‐Thinning Magma in Dikes

AGU Advances, Volume 6, Issue 2, April 2025.
Abstract The viscosity of magma has a first‐order control on the explosivity and hazards of a volcanic eruption, and the detection of diking within the subsurface may indicate an eruption is imminent. As magma approaches the surface it is highly likely it will have a non‐Newtonian shear‐thinning rheology (apparent viscosity decreases as shear rate ...
Janine L. Kavanagh, Caitlin M. Chalk, Thomas J. Jones, David J. C. Dennis   +3 more
wiley   +1 more source

Understorey succession after burial by tephra from Mount St. Helens

Journal of Ecology, 2018
Successional change following disturbance is a fundamental ecological process that remains central to understanding patterns in plant ecology. Although succession has been studied for well over a century, understanding of the patterns and processes of ...
D. Fischer, J. Antos, A. Biswas, D. Zobel   +3 more
semanticscholar   +1 more source

Seismic Stratigraphy of Valdivia Bank, South Atlantic and Implications for Oceanic Plateau Evolution, Sedimentation, and Thermal Rejuvenation

Geochemistry, Geophysics, Geosystems, Volume 26, Issue 4, April 2025.
Abstract Valdivia Bank (VB) is an oceanic plateau in the South Atlantic that formed from hotspot‐ridge volcanism during the Late Cretaceous at the Mid‐Atlantic Ridge (MAR). It is part of Walvis Ridge (WR), a quasi‐linear seamount chain extending from offshore Namibia to Tristan da Cunha and Gough Islands.
E. Contreras, W. Sager, V. Spiess, N. Fekete, B. Wu, H. Zhou   +5 more
wiley   +1 more source

A Continuous 150‐kyr Record of Geomagnetic Field Variations From Lake Chala, Eastern Equatorial Africa

Geochemistry, Geophysics, Geosystems, Volume 26, Issue 4, April 2025.
Abstract Records of geomagnetic field variations from continental Africa are sparse yet provide a key dating tool for low‐latitude paleoclimatic changes. Long‐lived tectonic and crater lakes in eastern tropical Africa potentially provide important, long (>100,000 years, kyrs) and continuous sedimentary records of African monsoonal climate over past ...
Anita Di Chiara, Vassil Karloukovski, Barbara A. Maher, Maarten Van Daele, Thijs Van der Meeren, Dirk Verschuren   +5 more
wiley   +1 more source

Computer Code for Tephra Index

, 2023
The provided code incorporates a collection of linear regressions and stepwise selection techniques to predict tephra layers within lacustrine deposits using spectral gamma-ray data.
openaire   +2 more sources

Assessment of Seawater Nd Isotope Signatures Extracted From Foraminiferal Shells and Authigenic Phases From Volcanogenic Sediments of the Adriatic Sea

Geochemistry, Geophysics, Geosystems, Volume 26, Issue 4, April 2025.
Abstract The neodymium isotope signatures (εNd) of the authigenic fraction have been extensively used to reconstruct past seawater εNd and hydrological circulation. Among the various methods, sequential extraction of hydrogenic ferromanganese oxyhydroxides from bulk sediments represents a rapid and straightforward approach that may potentially induce ...
Guohui Gao, Christophe Colin, Giuseppe Siani, Sophie Sepulcre, Rosella Pinna‐Jamme, Frederic Haurine, Arnaud Dapoigny   +6 more
wiley   +1 more source

Multispectral Properties of Rocks in Marker Band Valley and Evidence for an Alteration Unit Below the Amapari Marker Band at Gale Crater, Mars

Journal of Geophysical Research: Planets, Volume 130, Issue 4, April 2025.
Abstract The Mars Science Laboratory rover, Curiosity, has been examining strata from a period of Martian history where extensive clay mineral formation transitioned to sulfate mineral formation. This mineralogic change corresponds to a change from a wetter to a more arid climate.
W. H. Farrand, A. M. Eng, A. R. Trussell, J. R. Johnson, J. F. Bell III, S. G. Banham, A. L. Roberts, L. M. Thompson, E. B. Rampe, C. J. Hardgrove, C. M. Fedo, A. A. Fraeman, C. M. Weitz   +12 more
wiley   +1 more source

Exploring the origins of magnetization within the Chicxulub crater upper peak ring

Meteoritics &Planetary Science, Volume 60, Issue 4, Page 823-848, April 2025.
Abstract Large terrestrial impacts may produce vast subsurface hydrothermal systems, capable of generating conditions favorable to the origin of life. Modeling suggests that these systems may persist for >1 million years for basin‐sized craters; however, direct experimental constraints on hydrothermal system duration are needed.
Christina M. Verhagen, Sonia M. Tikoo, Martin Schmieder, Jérôme Gattacceca, François Demory, Juliane Gross, David A. Kring, Paul V. Burger, Sean P. S. Gulick, Joanna V. Morgan, Mario Rebolledo‐Vieyra, Jaime Urrutia‐Fucugauchi, Annemarie E. Pickersgill, Cornelia Rasmussen   +13 more
wiley   +1 more source

Morphology and microtextures of tephra particles

, 2011
The purpose of this PhD thesis is to give insights into the dynamics of highly explosive eruptions and on both tephra dispersal and sedimentation, based on the characterization of the erupted material. A systematic and detailed morphological characterization of tephra particles from different eruptions and the calculation of their terminal fall ...
openaire   +2 more sources

Late Cenozoic tephrostratigraphy offshore the southern Central American Volcanic Arc: 1. Tephra ages and provenance

, 2016
We studied the tephra inventory of 18 deep‐sea drill sites from six DSDP/ODP legs (Legs 84, 138, 170, 202, 205, and 206) and two IODP legs (Legs 334 and 344) offshore the southern Central American Volcanic Arc (CAVA). Eight drill sites are located on the
J. Schindlbeck, S. Kutterolf, A. Freundt, G. Alvarado, K.‐L. Wang, S. Straub, S. Hemming, M. Frische, J. Woodhead   +8 more
semanticscholar   +1 more source