Results 41 to 50 of about 3,752 (234)
, 2022 We report new U–Pb ages of 3823 to 230 Ma for zircon xenocrysts directly from Cretaceous granites (129 Ma).THIS DATASET IS ARCHIVED AT DANS/EASY, BUT NOT ACCESSIBLE HERE.
Chen, Y (via Mendeley Data)
core +1 more source
Литосфера, 2020 The article considers xenocrysts and megacrysts hosted in the rocks of Early Cretaceous olivine-basalt-basanite-nephelinite association that outcropped in the erosion crater of Makhtesh Ramon (Natural Reserve of Mishmar ha-Nagev, Israel).
Z. Yudalevich, Ye. Vapnik
doaj
Microstructure and Texture of a Spinel Corona Around a Basalt Hosted Corundum Xenocrystal
Journal of Petrology, 2023 AbstractThe microstructural and textural characteristics of a spinel corona that formed around a faceted corundum xenocrystal by reaction with the hosting basaltic melt in the Siebengebirge volcanic field demonstrate that the crystallographic and shape preferred orientation of spinel is influenced by the orientation of the reaction interface with ...
Schuster, Roman +5 more
openaire +3 more sources
Crystals, 2023 The geographic origin determination of ruby is increasingly important in the gem trade and geological research. Unlike metamorphic-related ruby, the rarer basalt-related ruby has gained significant attention, especially from Thailand, a major producer of
Enqi Li, Bo Xu
doaj +1 more source
Multidisciplinary Modeling of Mantle Lithosphere Structure Within the Superior Craton, North America
Geochemistry, Geophysics, Geosystems, 2021 New 3D multi‐azimuthal receiver function analysis identified four regional seismic discontinuities dipping at 7–13° within the mantle of the Superior craton of North America; most are discordant to known major upper crustal structures.
David B. Snyder +6 more
doaj +1 more source
Geochemistry, Geophysics, Geosystems, 2023 The origin of Italian kamafugites and lamproites is a matter of debate, not least due to their “crustal signature” displayed by trace element compositions and isotopic ratios, but also due to puzzling geodynamic significance.
Jennifer Günther +5 more
doaj +1 more source
Appraisal of Six Natural Mica Reference Materials for In Situ Rb‐Sr Geochronology
Geostandards and Geoanalytical Research, EarlyView.Key Points Evaluated six natural mica reference materials for in situ LA‐ICP‐MS/MS Rb‐Sr geochronology using geochemical, microstructural and isotopic characterisation. Identified robust primary reference materials: Mount Dromedary biotite (99.37 Ma) and Mica‐Fe biotite (307.75 Ma). La Posta biotite and Högsbo muscovite are suitable secondary reference
Hugo K.H. Olierook +38 more
wiley +1 more source
Geosystems and Geoenvironment, 2022 We have re-visited the ‘diamondiferous kimberlite’ from the Jamnidih area of Mahasamund, Bastar Craton, Central India. This study presents detailed field observations, petrographic and geochemical studies of Jamnidih rocks in view of the reported ...
Mahendra Kumar Singh +3 more
doaj +1 more source
Timing of the Granite magmatism, Wadi Abu Abid, North Eastern Desert, Egypt [PDF]
Alfarama Journal of Basic & Applied SciencesGranitic rocks represent a large portion of the Arabian-Nubian Shield (ANS) exposures in the North Eastern Desert (NED). The timing of the magmatic events plays a major role in illustrating the ANS development.
Mohamed Gharib +3 more
doaj +1 more source
Geochemistry, Geophysics, Geosystems, 2020 Major, trace, and isotopic compositions of plagioclase megacrysts from plagioclase ultraphyric basalts (PUB) from multiple mid‐ocean ridges were determined to characterize the liquid compositions from which they were derived.
Roger L. Nielsen +4 more
doaj +1 more source