Neil R Bennett

Neil R Bennett
California State University, East Bay | CSUEB · Chemistry and Biochemistry

PhD

About

26
Publications
3,813
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362
Citations
Introduction
Currently teaching in the Chemistry and Biochemistry dept. at CSU, East Bay and am a visiting scientist in the Earth and Planetary Sciences Dept. at UC Davis. I'm interested in: experimental petrology, planetary differentiation, element speciation in silicate melts, mixing properties of alloys.
Additional affiliations
September 2008 - August 2013
University of Toronto
Position
  • PhD Student
September 2008 - August 2013
University of Toronto
Position
  • PhD Student
September 2004 - June 2008
University of Birmingham
Position
  • Student

Publications

Publications (26)
Article
We report results from multi-anvil (MA) and laser-heated diamond anvil cell (LH-DAC) experiments that synthesize high-pressure phases, including bridgmanite, ferropericlase, stishovite, and ultramafic liquid, in the presence of an argon-rich fluid. The goal of the experiments is to constrain the equilibrium distribution of argon in magma ocean envi...
Preprint
Full-text available
Earth’s volatile elements cannot be accounted for as mixtures of different chondrites, despite their clear chondritic heritage. Early-acting, but as yet unidentified, processes apparently fractionated volatile elements now contained by planets. Here we test the hypothesis that planetary-scale differentiation, namely core formation and primordial at...
Article
Full-text available
The D” layer at the base of the Earth’s mantle exhibits anomalous seismic properties, which are attributed to heat loss from and chemical interaction with the underlying molten Fe-rich outer core. Here we show that mass transfer due to temperature variations within the D” layer could lead to resolvable fractionation of iron isotopes. We constrain t...
Article
Rationale: The microanalytical community has an outstanding need for PGE standard reference materials, particularly for trace element analysis by LA-ICPMS. NIST glasses contain Rh, Pd, and Pt, but lack Ru, Os, and Ir. Synthesis of silicate PGE standards has proven difficult due the tendency of PGEs to form metallic nuggets. Methods: Additive man...
Article
Full-text available
The Moon accreted meteoritic material towards the end of Solar System formation. Quantification of this late accretion requires an estimation of the abundance of highly siderophile, or iron-loving, elements in the lunar mantle. As lunar mantle samples are not available, estimates are derived from lunar basalt compositions, but the melting phase rel...
Article
Performing well-controlled metal-silicate partitioning experiments at conditions directly simulating those of a deep magma ocean is difficult. It is therefore common to perform experiments at lower pressures and temperatures, which are used to determine the effects of salient variables. Often, these effects are determined by multiple linear regress...
Article
Isotopic fractionation associated with diffusion in crystals is the most reliable means of understanding the origin of mineral zoning in igneous and metamorphic rocks. We have experimentally determined the relative diffusivities of iron isotopes in olivine as a function of crystallographic orientation, composition, and temperature. For two isotopes...
Article
Full-text available
The decay of short-lived iodine (I) and plutonium (Pu) results in xenon (Xe) isotopic anomalies in the mantle that record Earth's earliest stages of formation. Xe isotopic anomalies have been linked to degassing during accretion, but degassing alone cannot account for the co-occurrence of Xe and tungsten (W) isotopic heterogeneity in plume-derived...
Article
Full-text available
The origin of Earth's ancient magnetic field is an outstanding problem. It has recently been proposed that exsolution of MgO from the core may provide sufficient energy to drive an early geodynamo. Here we present new experiments on Mg partitioning between iron-rich liquids and silicate/oxide melts. Our results indicate that Mg partitioning depends...
Article
Full-text available
Nano-crystalline diamond is a new carbon phase with numerous intriguing physical and chemical properties and applications. Small doped nanodiamonds for example do find increased use as novel quantum markers in biomedical applications. However, growing doped nanodiamonds below sizes of 5 nm with controlled composition has been elusive so far. Here w...
Article
We have performed experiments to investigate the solubility and metal-silicate partitioning of gold as a function of metal sulphur content (XS), silicate melt polymerization (NBO/T) and pressure (P). These experiments show that Au becomes less siderophile both with increasing pressure and as the metal phase becomes more sulphur-rich. For the studie...
Article
The platinum-group elements (PGEs; Os, Ir, Ru, Rh, Pt, Pd), along with rhenium and gold, are grouped together as the highly siderophile elements (HSEs), defined by their extreme partitioning into the metallic, relative to the oxide phase (> 104). The HSEs are highly refractory, as gauged by their high melting and condensation temperatures, and were...
Article
Estimates of the primitive upper mantle (PUM) composition reveal a depletion in many of the siderophile (iron-loving) elements, thought to result from their extraction to the core during terrestrial accretion. Experiments to investigate the partitioning of these elements between metal and silicate melts suggest that the PUM composition is best matc...
Article
The solubility of Pt in silicate melt was investigated at conditions of 2073–2573 K, 2 GPa and ∼IW −1.5 to +3.5. These are the first measurements of Pt solubility under conditions more reducing than the iron-wüstite buffer (IW) which are demonstrably free from contamination by metal-inclusions. Pt solubility increases with increasing temperature an...
Presentation
An abstract detailing experiments to determine the non-metal avoidance behaviour of siderophile elements using a thermal diffusion technique.
Article
A calibration method for quantitative determination of Ce4+/Ce3+ in alkali-aluminosilicate glasses using Ce M-4,M-5-edge X-ray absorption near edge structure (XANES) spectroscopy is presented. Samples of varying alkali oxide content synthesized over a range of temperatures and oxygen fugacities (fO(2)) were analyzed using both synchrotron-based XAN...
Article
The solubility of Re and Au in haplobasaltic melt has been investigated at 1673–2573 K, 0.1 MPa–2 GPa and IW−1 to +2.5, in both carbon-saturated and carbon-free systems. Results extend the existing, low pressure and temperature, dataset to more accurately predict the results of metal-silicate equilibrium at the base of a terrestrial magma ocean. So...
Data
The solubility of Re and Au in haplobasaltic melt has been investigated at 1673-2573 K, 0.1 MPa-2 GPa and IW-1 to +2.5, in both carbon-saturated and carbon-free systems. Results extend the existing, low pressure and temperature, dataset to more accurately predict the results of metal-silicate equilibrium at the base of a terrestrial magma ocean. So...
Article
Reliable determination of highly siderophile element (HSE) distribution between metal and silicate melt is key to understanding the relative roles of equilibrium core-formation and ongoing accretion in establishing the observed level of these elements in the primitive upper mantle (PUM). Platinum is of particular interest among the HSE due to its p...
Article
Full-text available
There is a basic assumption that the upper crustal point of magma emplacement overlies the point where magma was generated. This contribution discusses the concept of lateral magma movement in the upper crust based on the Mourne Granite Centres, Northern Ireland. We report anisotropy of magnetic susceptibility fabric data from the Western Mourne Ce...
Article
Soret separation of melts consisting of Fe (+ 1–10wt.% Ni) with added C, Si or S and trace highly siderophile elements (HSE; Ru, Rh, Pd, Re, Os, Ir, Pt and Au) was investigated in experiments done at 2GPa, Thot~2000°C and Thot−Tcold~250°C. Experiments with added C and Si produced homogeneous samples, whereas those with S resulted in significant com...

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