A5003954112- Geological and Geochemical Analysis
- Crystal Structures and Properties
- Geochemistry and Geologic Mapping
- Geochemistry and Elemental Analysis
- Geology and Paleoclimatology Research
- Calcium Carbonate Crystallization and Inhibition
- Clay minerals and soil interactions
- Marine Biology and Environmental Chemistry
- Planetary Science and Exploration
- Astro and Planetary Science
- High-pressure geophysics and materials
- Marine Ecology and Invasive Species
- X-ray Diffraction in Crystallography
- earthquake and tectonic studies
- Ocean Acidification Effects and Responses
- Building materials and conservation
- Paleontology and Stratigraphy of Fossils
- Marine Biology and Ecology Research
- Radioactivity and Radon Measurements
- Cultural Heritage Materials Analysis
- Marine Bivalve and Aquaculture Studies
- Heavy metals in environment
- Biocrusts and Microbial Ecology
- Isotope Analysis in Ecology
- Zeolite Catalysis and Synthesis
Natural History Museum
2016-2025
Iziko Museums of South Africa
2024
Polish Academy of Sciences
2024
American Museum of Natural History
2015
Tata Steel (Netherlands)
2004
GFZ Helmholtz Centre for Geosciences
1998-2003
University of Bristol
2002
Abstract On September 24, 2023, NASA's OSIRIS‐REx mission dropped a capsule to Earth containing ~120 g of pristine carbonaceous regolith from Bennu. We describe the delivery and initial allocation this asteroid sample introduce its bulk physical, chemical, mineralogical properties early analyses. The is very dark overall, with higher‐reflectance inclusions particles interspersed. Particle sizes range submicron dust stone ~3.5 cm long. Millimeter‐scale larger stones typically have hummocky or...
Abstract The Jadar deposit (Serbia) is a unique end member of the volcano-sedimentary Li class, where main ore mineral jadarite (LiNaSiB3O7(OH)), to date only recorded at locality. We provide first account features based on study drill hole material, complemented by petrographic analysis, whole-rock, and isotopic geochemistry. Li-B mineralization hosted sediments interlayered with tuffs that were deposited in fault-bounded lacustrine basin. Mineralization processes initially involved...
Cristobalite is a common mineral in volcanic ash produced from dome-forming eruptions. Assessment of the respiratory hazard posed by requires understanding nature cristobalite it contains. Volcanic contains coupled substitutions Al
The stable isotope compositions of Cu and Zn in major geochemical reservoirs is increasingly studied with the aim to develop these systems as novel tools study their global biogeochemical cycles. objectives present were particular (i) constrain further range Cu, Zn, Pb mineral dust by analysing samples from sources Asia Africa (Chinese Loess Plateau, Chinese deserts, Thar desert, Sahel region) (ii) assess impacts human activities on composition aerosols synthesising published natural...
Abstract Land colonization by plants and their fungal bacterial symbionts during the Paleozoic was fundamental to evolution of terrestrial ecosystems, but how these early communities influenced mineral weathering soil development remains largely unknown. We investigated cryptogamic ground covers (CGCs) in Iceland identify modern analogous characterize structure biologically mediated features. Using a novel application X-ray microcomputed tomography, we show that moss-dominated CGCs soils are...
Abstract Piston-cylinder cell assemblies experience inhomogeneous pressure distribution upon pressurization due to the variable compressibilities of components. This results in sample experiencing a lower than expected, given applied force piston. Although effect is generally compensated for by applying ‘friction’ correction, there have been wide variations corrections some harder materials. We determined friction correction factors range commonly used our laboratory relative select...
Over 50 million people in South Asia are exposed to groundwater contaminated with carcinogenic arsenic(III). Photocatalyst-adsorbent composite materials popularly developed for removing arsenic a single-step water treatment. Here, As(III) is oxidised As(V), which subsequently removed via adsorption. We previously component additive surface complexation model (CA-SCM) predict the speciation of adsorbed onto TiO2/Fe2O3 under different environmental conditions, using complexes taken from...
On 24 September 2023, the NASA OSIRIS-REx mission dropped a capsule to Earth containing approximately 120 g of pristine carbonaceous regolith from Bennu. We describe delivery and initial allocation this asteroid sample introduce its bulk physical, chemical, mineralogical properties early analyses. The is very dark overall, with higher-reflectance inclusions particles interspersed. Particle sizes range sub-micron dust stone about 3.5 cm long. Millimeter-scale larger stones typically have...
The search for in situ organic matter on Mars involves encounters with minerals and requires an understanding of their influence lander rover experiments. Inorganic host materials can be helpful by aiding the preservation compounds or unhelpful causing destruction during thermal extraction steps. Perchlorates are recognized as confounding degradation studies. On heating, perchlorates decompose to produce oxygen, which then oxidizes matter. Other common Mars, such sulfates, may also oxygen...
Abstract Exceptional preservation of biogeochemical complexity in the Precambrian is largely limited to cherts, phosphates and shales; however, ancient fossils, including microbial mats microbially induced sedimentary structures, also occur, more rarely, poorly sorted, coarse-grained siliciclastics. The precise micromechanics by which exceptional retention organic traces occur within such rocks over billion-year geological timescales remain understood. Herein, we explore micro–nano-scale...
Research Article| October 01, 2010 Aragonite in olivine from Calatrava, Spain—Evidence for mantle carbonatite melts >100 km depth Emma R. Humphreys; Humphreys 1Department of Earth Sciences, University Bristol, Wills Memorial Building, Bristol BS8 1RJ, UK2Department Mineralogy, Natural History Museum, Cromwell Road, London SW7 5BD, UK Search other works by this author on: GSW Google Scholar Ken Bailey; Bailey Chris J. Hawkesworth; Hawkesworth UK3University St Andrews, College Gate, North...
Mixed color waste glass extracted from municipal solid is either not recycled, in which case it an environmental and financial liability, or used relatively low value applications such as normal weight aggregate. Here, we report on converting into a novel glass-ceramic lightweight aggregate (LWA), potentially suitable for high added structural concrete (upcycling). The artificial LWA particles were formed by rapidly sintering (<10 min) powder with clay mixes using sodium silicate binder...
Abstract Aim Quantify the contribution of environmental factors (water temperature, salinity and depth) evolutionary history to varied skeletal mineralogy in calcifying marine organisms. Location Global Ocean. Time period Present. Major taxa studied Order: Cheilostomatida; Phylum: Bryozoa. Methods We employed X‐ray diffraction (XRD) analyse mineral composition 872 individual colonies, representing 437 bryozoan species, terms calcite/aragonite ratios. integrated these data with equivalent...
While there is enormous interest in studying oxide perovskites with stoichiometries based upon or derived from ABO3, including oxygen-deficient compositions and organometallics, other closely related topologies have been overlooked. Hydroxyperovskites are such a group. Their structures perovskite-like octahedral frameworks vacant cavity A sites, all oxygen atoms form hydroxyl groups. There fifteen naturally occurring hydroxyperovskites numerous synthetic analogues. two stoichiometries:...
Mussels have the ability to control biomineral production and chemical composition, producing shells with a range of functions. In addition biological control, environment also seems influence process biomineralization; thus, can be used as archives ambient water parameters during calcium carbonate deposition. Past present environmental conditions are recorded in form various proxies including Mg/Ca or Sr/Ca ratios. For such accurate robust, effects size studied organism must examined...
Bryozoans represent an extremely diversified phylum in terms of biomineralogy. The mineral composition the bryozoan skeleton is most likely controlled by organism itself and to some degree ambient environmental conditions (e.g., pH, Mg/Ca ratio, temperature). purpose this study describe nearly one-quarter all Antarctic species known date discuss, locally a global context, potential factors that control mineralization skeletons. Collections bryozoans were gathered divers with van Veen grabs...
Here we use two enriched stable isotopes, 68Znen and 64Znen (>99%), to prepare 68ZnO nanoparticles (NPs) soluble 64ZnCl2. The standard LUFA 2.2 test soil was dosed with NPs 64ZnCl2 5 mg kg-1 each, plus between 0 95 of ZnCl2 a natural isotope composition. After 0, 1, 3, 6, 12 months incubation, earthworms (Eisenia andrei) were introduced for 72 h exposures. Analyses soils, pore waters, earthworm tissues using multiple collector inductively coupled plasma mass spectrometry allowed the...