Results 91 to 100 of about 571,249 (212)

Magmatic Interaction as Recorded in Texture and Composition of Plagioclase Phenocrysts from the Sirjan Area, Urumieh-Dokhtar Magmatic Arc, Iran [PDF]

Journal of Sciences, Islamic Republic of Iran, 2009
Tertiary andesitic basalts of the Sirjan area, Urmieh-Dokhtar Magmatic Arc, Iran, contain plagioclase phenocrysts enclosed in a matrix of amphibole, clinopyroxene and rare olivine crystals.
B. Monfaredi
doaj  

Tectonics on Early Earth Driven by Earth's Changing Shape During Tidal Recession of the Moon

Journal of Geophysical Research: Solid Earth, Volume 131, Issue 11, November 2026.
Abstract Few fragments of Earth's earliest crust have survived, and so this formative period of our planet's history is shrouded in mystery. To leverage the limited data available, it is important to understand all the processes that could have shaped our young planet.
S. J. Lock
wiley   +1 more source

A Late Cretaceous Aborted Spreading Center in the Northern Arabian Sea Recorded by the Laxmi Basin

Geochemistry, Geophysics, Geosystems, Volume 27, Issue 11, November 2026.
Abstract The Laxmi Basin (LB), a marginal depression, is a prominent geomorphic feature in the northern Arabian Sea. Understanding how the basin formed has important implications for the India–Seychelles breakup and the evolution of the western Indian Ocean.
Sibin Sebastian, Jyotiranjan S. Ray
wiley   +1 more source

Insights From Megacryst‐Included Zircon Dates on the Spatial Extent of Magma Mixing in the Tuolumne Intrusive Suite, California, USA

Geochemistry, Geophysics, Geosystems
The spatial extent of mixing between separately emplaced batches of magma is a key component in understanding the incremental assembly of plutons. Potassium feldspar megacrysts (>3 cm length) in granodioritic rocks are hypothesized to record magma mixing
Elena Watts, Julia Ye, Sean P. Gaynor, Valbone Memeti, Blair Schoene   +4 more
doaj   +1 more source

Magma mixing during the 2001 event at Mount Etna (Italy): Effects on the eruptive dynamics.

, 2006
During the 2001 eruptive episode three different magmas were erupted on the southern flank of Mount Etna volcano from distinct vent systems. Major and minor element chemistry of rocks and minerals shows that mixing occurred, and that the mixed magma was ...
CORTESOGNO, LUCIANO, VICCARO M., FERLITO C., CRISTOFOLINI R., GAGGERO, LAURA, VICCARO, MARCO, CRISTOFOLINI R, GAGGERO L., FERLITO, Carmelo, CORTESOGNO L   +9 more
core   +1 more source

Hydrothermal Sealing at Turrialba, Poás, and Rincón de la Vieja Volcanoes (Costa Rica) Promotes Phreatic and Phreatomagmatic Eruptions

Journal of Geophysical Research: Solid Earth, Volume 131, Issue 11, November 2026.
Abstract Hydrothermal sealing is a mechanism thought to be responsible for challenging‐to‐forecast phreatic and phreatomagmatic eruptions. To better understand this process, we present a study in which we assessed the textural, mineralogical, and physical properties (porosity, permeability, and tensile strength) of blocks of hydrothermal seal that were
Michael J. Heap, Geoffroy Avard, Claire E. Harnett, H. Albert Gilg, James Hickey, Thierry Reuschlé, Fabian B. Wadsworth, Maëlys Moulin, Sophie Pearson‐Grant, J. Maarten de Moor, Emily Mick, Patrick Baud   +11 more
wiley   +1 more source

Magma hybridization in the middle crust: Possible consequences for deep-crustal magma mixing

, 2012
The 465 Ma Svarthopen pluton in north-central Norway was emplaced under middle-crustal conditions (∼700 MPa) into metasedimentary rocks of the Helgeland Nappe Complex. The pluton is characterized by zones of mingling and mixing of gabbro/diorite with peraluminous, garnet-bearing biotite granite.
Barnes, CG, Frost, CD, Nordgulen, Øystein, Prestvik, Tore   +3 more
openaire   +2 more sources

Photometric Characterization of the Moon's Silicic Sites: Insights Into the Origin of Silica‐Rich Magmas

Journal of Geophysical Research: Planets, Volume 131, Issue 11, November 2026.
Abstract Lunar “red spots” have been inferred to be regions of extrusive silicic volcanism based on the analysis of remote sensing observations that suggest SiO2 ${\mathrm{S}\mathrm{i}\mathrm{O}}_{2}$‐rich, FeO‐poor composition and morphologies similar to terrestrial silicic domes.
S. R. Burnette, K. L.  Donaldson Hanna, A. Dove, J. M. Sunshine, L. Santori, S. N. Valencia   +5 more
wiley   +1 more source

A complex magmatic plumbing system beneath the subvolcanic mafic sill intrusions, Gabal Qatrani, Faiyum Depression, NW Desert, Egypt: Evidence from mineral textures, zoning and chemistry

Geosystems and Geoenvironment
Neogene subvolcanic sills of tholeiitic basalt from Gabal Qatrani, Faiyum Depression, NW Desert, Egypt, represent composite intrusions of monogenetic sequences that are related to Red Sea rifting.
Ezz El Din Abdel Hakim Khalaf, Takashi Sano   +1 more
doaj   +1 more source

Sulfidation Reaction Mechanisms of Olivine and Diopside at Mercury's Reducing Conditions

Journal of Geophysical Research: Planets, Volume 131, Issue 11, November 2026.
Abstract The surface of Mercury contains elevated amounts of sulfur of up to 4 wt.%. Volcanic degassing of S from the interior of the planet could have initiated sulfidation reactions between the degassed S and surface materials in the planet's past, leading to the observed surface S enrichment.
Rody C. Erftemeijer, Thomas Müller, Christian J. Renggli   +2 more
wiley   +1 more source