Results 81 to 90 of about 16,247 (260)

Britholite-(Ce) from the metaluminous granite of SW Egypt

open access: yesMineralogia, 2023
Optical microscopy and scanning electron microscopy-energy dispersive X-ray spectroscopy (SEM-EDS) analyses were used to characterize britholite-(Ce) of the metaluminous granite (Proterozoic) intruded into the Nubian Formation in southwestern Egypt and ...
Hassan Kamaleldin M.
doaj   +1 more source

El volcanismo jurásico superior de la Formación Río Damas-Tordillo (33°-35,5°S): antecedentes su sobre petrogénesis, cronología, proveniencia e implicancias tectónicas [PDF]

open access: yes, 2014
Los depósitos continentales y volcánicos de la Formación Rio Damas-Tordillo, Jurásico Superior, representan un período restringido de sedimentación continental dentro del registro mayormente marino de la Cuenca Neuquina.
Calderón, Sergio   +7 more
core   +2 more sources

Neoarchean Arc Magmatism and Crust Recycling in the Northern Marginal Zone of the Limpopo Complex, Zimbabwe: New Insights From Zircon U‐Pb‐Hf Isotopes of a Charnockite Suite

open access: yesGeological Journal, Volume 61, Issue 3, Page 566-592, March 2026.
Charnockites with 2691–2607 Ma magmatic ages from the NMZ show arc‐magmatic geochemical signatures. They correspond to the lower‐crustal equivalent of the Chilimanzi Suite Granite in the Zimbabwe Craton. Lu‐Hf isotopic data of magmatic zircons show negative εHf(t) values (−11.18 to −2.20) with TDMC ages of 3699–3158 Ma, suggesting their protolith ...
Toshiaki Tsunogae   +6 more
wiley   +1 more source

Geology of a Part of the Panamint Range, California [PDF]

open access: yes, 1932
The Panamint Range is a tilted fault-block, uplifted probably in Tertiary time and rejuvenated by very complex recent faulting on the west. This great block is approximately 100 miles long, but the reconnaissance geologic map covers only a tract in the ...
Murphy, F. M.
core  

Geochronological challenges posed by continuously developing tectonometamorphic systems: insights from Rb–Sr mica ages from the Cycladic Blueschist Belt, Syros (Greece). [PDF]

open access: yes, 2016
Is metamorphism and its causative tectonics best viewed as a series of punctuated events or as a continuum? This question is addressed through examination of the timing of exhumation of the Cycladic Blueschist Belt (CBB).
Bond, CE   +3 more
core   +1 more source

Rapid Slab Rollback Drives Early Cretaceous Back‐Arc Extension in NE China: Implication for Crustal Growth and Episodic Porphyry Mineralization

open access: yesGeochemistry, Geophysics, Geosystems, Volume 27, Issue 3, March 2026.
Abstract The subduction of the Paleo‐Pacific Plate beneath the NE Asian continental margin induced extensive magmatism, providing an excellent opportunity to investigate the interplay between plate dynamics, arc magmatism, continental crust formation, and porphyry mineralization.
Honghui Wang   +5 more
wiley   +1 more source

THE ISLAND ARC FERROCORDIERITE-ALMANDINE PLAGIORHYOLITES OF THE MOUNT KASTEL, MOUNTAIN CRIMEA

open access: yesИзвестия высших учебных заведений: Геология и разведка, 2017
Plagio rhyolites of the Pre-Late Jurassic dyke contain restitegamet (cribrate inter grow ths of almandinespessartine and quartz) and ferrocordierite. The garnets of such habit and composition and with such kind of zonality - the content of Mg increases ...
E. M. Spiridonov
doaj   +1 more source

Partitioning of trace elements and rare earth elements between titanite and major rock-forming minerals in eclogite and clinopyroxenite from the northeastern Shandong Peninsula, eastern China [PDF]

open access: yes, 2016
第2回極域科学シンポジウム/第31回極域地学シンポジウム 11月17日(木) 国立極地研究所 ...
Andrew G. Christy   +7 more
core   +1 more source

Eocene Lamproitic Magmatism in Gangdese: Melting Sub‐Arc Lithospheric Mantle and Implications for the Early Cenozoic Magmatic “Flare Up” in Southern Tibet

open access: yesGeochemistry, Geophysics, Geosystems, Volume 27, Issue 3, March 2026.
Abstract The role of sub‐arc mantle lithosphere in the build‐up of a batholith is an outstanding issue that is still not well resolved. Lamproite is a mantle‐derived magmatic rock that provides a window to learn the composition and the enrichment processes of subcontinental lithospheric mantle (SCLM).
Y. H. Tian   +4 more
wiley   +1 more source

The Significance of Magnetic Fabrics Preserved in Hydrothermally Altered Rocks

open access: yesJournal of Geophysical Research: Solid Earth, Volume 131, Issue 3, March 2026.
Abstract Anisotropy of Magnetic Susceptibility (AMS) and Anisotropy of Magnetic Remanence (AMR) are critical petrofabric tools for investigating the evolution of volcano‐magmatic, tectonic, and surface process systems. These highly sensitive techniques can distinguish multiple magnetic fabrics within individual samples, crucial in assessing archives of
Ben Latimer   +3 more
wiley   +1 more source

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