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Presolar silicate grains: Abundances, isotopic and elemental compositions, and the effects of secondary processing
presolar grains silicates nucleosynthesis isotopes AGB stars
2017/4/10
Close to a thousand presolar silicate grains have been identified since their initial discovery in interplanetary dust
particles (IDPs) just over ten years ago. Studies have shown that silicates are ...
In-situ chromium isotope measurement of chromium-rich fine grains in the Murchison CM2 chondrite
54-chromium isotopic anomaly presolar grain
2017/4/12
Isotopic anomalies of 54Cr have been reported in bulk chondrites. Stepwise dissolution experiments have suggested
the presence of a carrier of the 54Cr anomaly, probably of presolar origin. Although ...
Roundness and surface features of quartz grains in Middle Devonian deposits of the East Baltic and their palaeogeographical implications
East Baltic Devonian roundness of detrital particles surface texture of quartz
2009/10/21
The roundness and surface texture of quartz grains were studied in Devonian sediments of 32 drill cores. Roundness was estimated in more than 800 samples and surface textures were examined under scann...
A Deep-Water Glauconitization Process on the Ivory Coast-Ghana Marginal Ridge (ODP Site 959): Determination of Fe3+-Rich Montmorillonite in Green Grains
Eastern Atlantic Fe3+-rich Montmorillonite Foraminifer Fillings Glauconitization Green Clay Pleistocene
2011/12/5
Abstract: The mineral and chemical composition of green glauconitic grains from ODP Site 959 (2100 m water depth) located on the northern flank of the Ivory Coast-Ghana Marginal Ridge was studied. Rec...
Submicroscopic Structure of Fe-Coatings on Quartz Grains in Tropical Environments
Electron Microscopy Fe-coating Fe-nodules Fe-oxide Forms Submicroscopic Structure Ultrathin Sections X-ray Microprobe Analysis
2011/12/27
Formation of Fe-coatings or segregation at the expense of quartz grains is a common process in the tropical environment. Limited information is available about their internal structure at the submicro...
Occluded Mica in Hydroxy-Interlayered Vermiculite Grains from a Highly-Weathered Soil
Electron microprobe High-resolution transmission electron microscopy Mica transformation Vermiculite
2011/12/1
Abstract: Hydroxy-interlayered vermiculite (HIV) is a ubiquitous phyllosilicate in the <0.05-mm fraction of sandy soils on the U.S. southeastern coastal plain. Extensive areas of soils with abundant H...