Publications by authors named "Etienne Deloule"
The occurrence of rhyolite melts in the mantle has been predicted by high pressure-high temperature experiments but never observed in nature. Here we report natural quartz-bearing rhyolitic melt inclusions and interstitial glass within peridotite xenoliths. The oxygen isotope composition of quartz crystals shows the unequivocal continental crustal derivation of these melts, which approximate the minimum composition in the quartz-albite-orthoclase system.
View Article and Find Full Text PDFHigh-spatial-resolution measurements of iron isotopes in pyrites by secondary ion mass spectrometry using the new Hyperion-II radio-frequency plasma source.
Rapid Commun Mass Spectrom
February 2021
Article Synopsis
- * A new plasma ion source, Hyperion-II, significantly improves the spatial resolution and sensitivity of measurements in comparison to older methods, allowing for high-precision analysis of iron isotopes in pyrites.
- * Tests confirm that factors such as crystal orientation and topography have minimal impact on measurement accuracy, leading to a reliable method for analyzing micrometric pyrites with enhanced clarity and stability.
Lithium elemental and isotopic compositions of olivines in peridotite xenoliths from Hebi in the North China Craton provide direct evidence for the highly variable δ(7)Li in Archean lithospheric mantle. The δ(7)Li in the cores of olivines from the Hebi high-Mg# peridotites (Fo > 91) show extreme variation from -27 to +21, in marked deviation from the δ(7)Li range of fresh MORB (+1.6 to +5.
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