Results 91 to 100 of about 9,703 (232)

Integrating Olivine Diffusion Chronometry With Monitoring Data to Decipher the Magma Dynamics at the Submarine Fani Maoré Volcano

Geochemistry, Geophysics, Geosystems, Volume 27, Issue 6, June 2026.
Abstract Monitoring data are critical for understanding volcanic unrest and eruption, but they often lack the ability to constrain the pre‐eruptive magma processes. As such, an increasing number of studies couple monitoring data with petrological tools to obtain insights into the causes and durations of magmatic processes. The 2018–2020 eruption of the
Karoline Brückel, Etienne Médard, Fidel Costa, Carole Berthod, Pauline Verdurme, Patrick Bachèlery, Lise Retailleau, Jean‐Christophe Komorowski, Lucia Gurioli   +8 more
wiley   +1 more source

Sintering polycrystalline olivine and polycrystalline clinopyroxene containing trace amount of graphite from natural crystals

Earth, Planets and Space, 2017
Graphite-bearing polycrystalline olivine and polycrystalline clinopyroxene with submicron to micron grain size were successfully sintered from a single crystal of naturally occurring olivine (Fo88–92Fa12–8: Mg1.76–1.84Fe0.16–0.24SiO4) and a single ...
Yumiko Tsubokawa, Masahiro Ishikawa
doaj   +1 more source

Geochemical Constraints on Spatial‐Temporal Distribution and Origin of Anomalous Mantle in the Western Pacific Basins

Geochemistry, Geophysics, Geosystems, Volume 27, Issue 6, June 2026.
Abstract Seafloor basalt samples recovered from the Caroline Basin (CB), the Parece Vela Basin (PVB), and the Western Philippine Sea Plate (WPSP) are analyzed for whole‐rock major and trace elements (including H2O), Sr‐Nd‐Pb‐Hf isotopes and 40Ar‐39Ar age‐dating.
Guo‐Liang Zhang, Han‐Tao Chi, Ji Zhang, Feng Xu   +3 more
wiley   +1 more source

Geochemical and Isotopic Constraints on Long‐Lived Source Enrichment and Mantle Evolution in Paleoproterozoic Cratonic Lamprophyres

Geochemistry, Geophysics, Geosystems, Volume 27, Issue 6, June 2026.
Abstract The cratonic lithospheric mantle records complex metasomatic processes and is frequently tapped by alkaline magmatism, offering a unique opportunity to trace the progressive evolution of the mantle. In the present contribution, we investigate a newly identified calc‐alkaline lamprophyre field from the Neoarchean Jonnagiri Schist Belt, Eastern ...
Sourav Naskar, Rohit Pandey, Nils Björn Baumann, N. V. Chalapathi Rao, George Mathew, J. Amal Dev, J. K. Tomson   +6 more
wiley   +1 more source

Clinopyroxene precursors to amphibole sponge in arc crust [PDF]

Nature Communications, 2014
AbstractThe formation of amphibole cumulates beneath arc volcanoes is a key control on magma geochemistry, and generates a hydrous lower crust. Despite being widely inferred from trace element geochemistry as a major lower crustal phase, amphibole is neither abundant nor common as a phenocryst phase in arc lavas and erupted pyroclasts, prompting some ...
openaire   +3 more sources

Multidisciplinary Investigation of Healy Submarine Volcano (Kermadec Arc, New Zealand) Using AUV and Submersible Data: Structural Control on Magmatic and Hydrothermal Processes

Geochemistry, Geophysics, Geosystems, Volume 27, Issue 6, June 2026.
Abstract We present a comprehensive multidisciplinary investigation of the Healy submarine volcano in the southern Kermadec arc, northeast of New Zealand. We show the first results of sidescan‐sonar data collected at a submarine arc volcano by an Autonomous Underwater Vehicle (AUV).
A. Bagnasco, F. Caratori Tontini, C. E. J. de Ronde, S. L. Walker, L. Cocchi, A. Ghirotto, E. Armadillo   +6 more
wiley   +1 more source

The Seismic Signature of the Atlantis Massif Oceanic Detachment Fault Determined From Crystallographic Preferred Orientation and Microstructure

Journal of Geophysical Research: Solid Earth, Volume 131, Issue 6, June 2026.
Abstract At slow‐spreading mid‐ocean ridges large scale detachment faults partly accommodate the spreading process. The mafic and ultramafic rocks at the ridges are infiltrated by water and change their mineralogy. Subsequently or contemporaneously to these reactions, detachment faulting takes place.
R. Kuehn, J. H. Behrmann, J. Kossak‐Glowczewski, B. Leiss, M. Stipp   +4 more
wiley   +1 more source

Comparative compressibility of clinopyroxenes from mantle nodules

European Journal of Mineralogy, 1995
The comparative compressibilities of two clinopyroxenes from mantle nodules were determined by single crystal X-ray diffraction with a Merrill-Bassett diamond anvil cell. The analysed crystals show different chemical compositions: PC 135, from a spinel lherzolitic nodule from Pico Cabugi, NE Brazil, has more R3+ (Fe3+ + VIA1 + Ti + Cr) in the Ml site ...
COMODI, Paola, PRINCIVALLE F., TIRONE M., ZANAZZI, Pier Francesco   +3 more
openaire   +3 more sources

Water in Eclogite and Pyroxenite Xenoliths From the Bottom 100 km of the Slave Craton (Canada) Mantle Root

Geochemistry, Geophysics, Geosystems
Major and trace elements, including H2O, were determined in garnet and clinopyroxene to constrain the evolution of mantle xenoliths from Diavik, Canada.
Esther Schmädicke, Jürgen Gose, Thomas Stachel   +2 more
doaj   +1 more source

Lunar Crustal Formation by Melt Migration and Differentiation Within a Stagnant Lid

Journal of Geophysical Research: Planets, Volume 131, Issue 6, June 2026.
Abstract The lunar anorthosite highlands represent the Moon's primary crust, which formed during the solidification of a magma ocean following the Moon‐forming giant impact. However, the canonical model of anorthite flotation in the crystallizing magma ocean often struggles to reproduce the long > ${ >} $200 Myr solidification timescale required by the
K. H. Dodds, C. Michaut, J. A. Neufeld
wiley   +1 more source