Nov 14, 2019 · Olivine is a widespread mineral in ultramafic to intermediate volcanic and igneous rocks (e.g., basalt to andesite, shoshonite, komatiite, boninite, peridotite, or gabbro) representative of various tectonic settings (Pearce and Cann, 1973). In primitive ocean island basalt, for instance, olivine is the only crystallizing phase and thus the main ...

Aug 6, 2018 · The schematic evolution of the complex growth, dissolution and diffusion history of olivine crystals from high-Mg middle-K Shiveluch basalt is depicted in simplified centre-to-margin...

Sep 15, 2023 · Our results reveal that the CE5 basalt olivines have overall lower Ni and Co than those in the Apollo low-Ti basalts. The distinctive olivine chemistry with recently reported bulk-rock chemistry carries evidence for more late-stage clinopyroxene-ilmenite cumulates of the lunar magma ocean (LMO) in the CE5 mantle source.

Sep 15, 2023 · In this study we use modelling of Fe-Mg interdiffusion in zoned olivine crystals to investigate the magmatic environments in which the zonation was formed, be that within the lunar crust or during cooling within a surficial lava flow, helping to understand the thermal histories of the two basalt suites.

Sep 24, 2020 · In this study, the hypothesis of phenocryst growth during ascent is tested for several basalts (13–7 wt% MgO) and shown to be viable. Phenocrysts of olivine and clinopyroxene frequently display diffusion-limited growth textures, and clinopyroxene compositions are consistent with polybaric crystallization.

Nov 1, 2019 · Olivine phenocrysts in basalts erupted in the Kaikohe-Bay of Islands volcanic field (KBIVF), a cluster of Quaternary monogenetic edifices in northern New Zealand, provide an opportunity to investigate magma source and assembly. The phenocryst population has both cognate and non-cognate origins with respect to the carrier magma.

Feb 6, 2024 · Olivine is another critical mineral in basalt classification. In alkali basalt, it is commonly present instead of Ca-poor pyroxene. In olivine tholeiites, it is present in company with Ca-poor pyroxene. By adding olivine, our basalt model has grown to four minerals: plagioclase, two pyroxenes, and olivine.

Jan 6, 2006 · Comparison of Gusev picritic basalts with olivine-phyric shergottites allows a more rigorous interpretation of their origin, and comparison with regionally extensive, olivine-rich surface units mapped using thermal emission spectroscopy provides a global geologic context for olivine-bearing rocks in the Martian crust.

Nov 17, 2012 · The olivine macrocrysts found in oceanites, picrites and magnesian basalts erupted at hotspot volcanoes are generally interpreted either as phenocrysts crystallized from the magma or as xenocrysts extracted from a deforming cumulate.

The sintering behavior of olivine and olivine-basalt aggregates has been examined at temperatures near 1,300° C. Experimental factors contributing to rapid sintering kinetics and high-density, fine-grained specimens include: (i) the uniform dispersion of basalt throughout the specimen, (ii) a very fine, uniform particle size for the olivine powd...