A5057948012- Geological and Geochemical Analysis
- High-pressure geophysics and materials
- earthquake and tectonic studies
- Glass properties and applications
- Geochemistry and Geologic Mapping
- Mineralogy and Gemology Studies
- Geology and Paleoclimatology Research
- Hydrocarbon exploration and reservoir analysis
- Clay minerals and soil interactions
- Building materials and conservation
- CO2 Sequestration and Geologic Interactions
- Astro and Planetary Science
- Radioactive element chemistry and processing
- Paleontology and Evolutionary Biology
- Geochemistry and Elemental Analysis
- Mine drainage and remediation techniques
- Evolution and Paleontology Studies
- Metal Extraction and Bioleaching
- Crystal Structures and Properties
- Nuclear materials and radiation effects
- Diamond and Carbon-based Materials Research
- Zeolite Catalysis and Synthesis
- Geological Studies and Exploration
- Paleontology and Stratigraphy of Fossils
- Geological formations and processes
University of Bristol
2015-2024
Abu Dhabi Department of Education and Knowledge
2023
Durham University
2015-2019
University of Tübingen
2016
ETH Zurich
2015
University of Edinburgh
2015
Institut des Sciences de la Terre
2015
Centre National de la Recherche Scientifique
2015
Université Savoie Mont Blanc
2015
University of Oxford
2015
We report new experimental data on the composition of magmatic amphiboles synthesised from a variety granite (sensu lato) bulk compositions at near-solidus temperatures and pressures 0.8–10 kbar. The total aluminium content (Altot) synthetic calcic varies systematically with pressure (P), although relationship is nonlinear low (<2.5 kbar). At higher pressures, resembles that other studies, which suggests general between Altot P relatively insensitive to composition. have developed...
We present new experiments, combined with a re-evaluation of published data, to characterize the topology silicate–carbonate two-liquid solvus in five-component system SiO2–Na2O–Al2O3–CaO–CO2 (SNAC + CO2). Conjugate liquid compositions have been determined for wide range pressures (0·1–2·5 GPa) and temperatures (1225–1700°C) as well variable degrees CO2 saturation. The expansion field increasing pressure and/or decreasing temperature, contraction conditions where PCO2 < Ptotal is accurately...
Fluids liberated from subducting slabs are critical in global geochemical cycles. We investigate the behaviour of Mo during slab dehydration using two suites exhumed fragments subducted, oceanic lithosphere. Our samples display a positive correlation δ98/95MoNIST 3134 with Mo/Ce, compositions close to typical mantle (-0.2‰ and 0.03, respectively) very low values both (-1‰) Mo/Ce (0.002). Together new, experimental data, we show that molybdenum isotopic fractionation is driven by preference...
Although gas exsolution is a major driving force behind explosive volcanic eruptions, viscosity critical in controlling the escape of bubbles and switching between effusive behavior. Temperature composition control melt viscosity, but crystallization above volume (>30 %) can lock up magma, triggering an explosion. Here, we present alternative to this well-established paradigm by showing how unexpectedly small nano-sized crystals cause disproportionate increase magma viscosity. Our situ...
Volatile elements play an important role in many aspects of the physicochemical architecture sub-volcanic plumbing systems, from liquid line descent to dynamics magma storage and eruption.However, it remains difficult constrain behaviour magmatic volatiles on short timescales before eruption using established petrologic techniques (e.g.melt inclusions): specifically, final days months storage.This study presents a detailed model pre-eruptive volatile Campi Flegrei system (Italy), through...
A compendium of diffusion measurements and their Arrhenius equations for water, carbon dioxide, sulfur, fluorine, chlorine in silicate melts similar composition to natural igneous rocks is presented. Water silicic well studied understood, however little data exists intermediate basic compositions. The demonstrate that both the water concentration anhydrous melt affect coefficient water. Carbon dioxide appears only weakly dependent, at most, on volatilefree no effect has been observed,...
We report the results of experiments on two natural marine sediments with different carbonate contents (calcareous clay: CO2 = 6·1 wt %; marl: 16·2 %) at subduction-zone conditions (3 GPa, 750–1200°C). Water (7–15 was added to starting materials simulate effects external water addition from within subducting slab. The onset melting is 760°C in water-rich experiments; melt becomes abundant by 800°C. In contrast, published, water-poor occurs variable temperatures production significant...
Abstract The Ethiopian Rift Valley hosts the longest record of human co-existence with volcanoes on Earth, however, current understanding magnitude and timing large explosive eruptions in this region is poor. Detailed records volcanism are essential for interpreting palaeoenvironments occupied by our hominin ancestors; also evaluating volcanic hazards posed to 10 million people currently living within active rift zone. Here we use new geochronological evidence suggest that a 200 km-long...
Abstract The Fe–Mg exchange coefficient between olivine (ol) and melt (m), defined as $${\text{Kd}}_{{{\text{Fe}}^{T} {-} {\text{Mg}}}}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mtext>Kd</mml:mtext><mml:mrow><mml:msup><mml:mrow><mml:mtext>Fe</mml:mtext></mml:mrow><mml:mi>T</mml:mi></mml:msup><mml:mo>-</mml:mo><mml:mtext>Mg</mml:mtext></mml:mrow></mml:msub></mml:math> = (Fe ol /Fe m )·(Mg /Mg ), with all Fe T expressed 2+ , is one of the most widely used...
The majority of basaltic magmas stall in the Earth's crust as a result rheological evolution caused by crystallization during transport. However, relationships between crystallinity, rheology and eruptibility remain uncertain because it is difficult to observe dynamic magma real time. Here, we present in-situ 4D data for crystal growth kinetics textural pyroxene trachybasaltic high-temperature experiments under water-saturated conditions at crustal pressures. We dendritic on initially...
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...