A5046904205- Geological and Geochemical Analysis
- Mineralogy and Gemology Studies
- Geology and Paleoclimatology Research
- Geochemistry and Geologic Mapping
- High-pressure geophysics and materials
- earthquake and tectonic studies
The University of Queensland
2017
Environmental Earth Sciences
2017
A wide number of genetic models have been proposed for volcanically transported ruby and sapphire deposits around the world. In this contribution we compare trace element chemistry, mineral melt inclusions, oxygen isotope ratios in blue to reddish-violet sapphires from Yogo Gulch, Montana, U.S.A., with rubies Chantaburi-Trat region Thailand Pailin Cambodia. The similarities between Thai/Cambodian suggest a common origin gem corundum both deposits. Specifically, advance model whereby formed...
Abstract Significant uncertainty surrounds the processes involved in formation of basalt-hosted corundum, particularly role that mantle plays corundum generation. Some previous studies have suggested trace-element ratios (namely, Cr/Ga and Ga/Mg) are useful for distinguishing two types corundum: ‘magmatic’ ‘metamorphic’, designations include crustal processes. However, recent studies, including this one, discovered transitional groups between these end-members difficult to classify.We used...
Many sapphire and ruby occurrences are spatially linked with orogenic belts such as the Pan-African Orogen, Himalayas, regions of active or former subduction along western margin Pacific Ocean. These gemstones have oxygen isotope compositions (δ18O) that span >45‰, reflecting wide range environments conditions involved in corundum (Al2O3) formation. We compiled a global data base δ18O, from which following major groups emerge: dominant population sapphires δ18O centred around 5.5‰ (the...