A5047921255- Geology and Paleoclimatology Research
- Paleontology and Stratigraphy of Fossils
- Geological and Geochemical Analysis
- Ion-surface interactions and analysis
- Geochemistry and Elemental Analysis
- High-pressure geophysics and materials
- earthquake and tectonic studies
- Nuclear Physics and Applications
- Silicon Effects in Agriculture
- Astro and Planetary Science
- Geological Studies and Exploration
- Planetary Science and Exploration
- Geological formations and processes
- Methane Hydrates and Related Phenomena
University of Bristol
2022-2024
Abstract The origin of titanium-rich basaltic magmatism on the Moon remains enigmatic. Ilmenite-bearing cumulates in lunar mantle are often credited as source, but their partial melts not a compositional match and too dense to enable eruption. Here we use petrological reaction experiments show that ilmenite-bearing react with olivine orthopyroxene mantle, shifting melt composition high-Ti suite. New high-precision Mg isotope data confirm basalts have variable isotopically light compositions...
We determined equilibrium Mg isotope fractionation between olivine and melt (Δ 26/24 Ol/melt ) in five, naturally quenched, olivine-glass pairs that were selected to show clear textural chemical evidence of equilibration.We employed a high-precision, critical mixture double-spiking approach obtain weighted mean Δ = -0.071± 0.010 ‰, for values corrected common olivineglass temperature 1438 K.As function temperature, the can be expressed as (-1.46± 0.26) × 10 5 /T 2 .The samples analysed have...
In order to better constrain the Mg isotopic composition of mantle, we have analysed twenty-eight samples both oceanic and continental peridotite using a high-precision, critical mixture double spiking approach. The unaltered show no variability δ26Mg in outside analytical uncertainty yield value −0.236 ± 0.006‰ (2s.e.) for accessible substantiating its non-chondritic composition. We also determined inter-mineral fractionations sub-set samples. document small but significant differences...
We analysed forty-nine, hand-picked, mid-ocean ridge basalt (MORB) glasses for their Mg isotopic compositions using a high-precision, critical mixture double-spiking approach. Additionally, the Fe of subset (twenty-two) these samples were measured. Samples from East Pacific, Mid-Atlantic, South Indian and Scotia ridges have average δ26Mg ∼ −0.21 ‰ δ57Fe ∼0.10 ‰, while those ultra-slow spreading Gakkel West lighter isotope compositions, as low −0.32 heavier up to 0.25 ‰. Overall, show...
We developed critical mixture double-spiking Si isotope measurement, achieving an enhanced long-term reproducibility of ±0.03‰ ( δ 30 Si, 2 s.d.), which is ∼4 times better than the current methods' over ±0.1‰ s.d.).