A5008914141- Geological and Geochemical Analysis
- earthquake and tectonic studies
- Coal and Its By-products
- Geochemistry and Geologic Mapping
- Geology and Paleoclimatology Research
- High-pressure geophysics and materials
- Geochemistry and Elemental Analysis
- Hydrocarbon exploration and reservoir analysis
- Mineralogy and Gemology Studies
- Mercury impact and mitigation studies
- Coal Properties and Utilization
- Planetary Science and Exploration
- Geological Studies and Exploration
- Coal and Coke Industries Research
- Paleontology and Stratigraphy of Fossils
- Methane Hydrates and Related Phenomena
- Radioactive element chemistry and processing
- Groundwater flow and contamination studies
- Astro and Planetary Science
- Heavy metals in environment
- Arsenic contamination and mitigation
- Clay minerals and soil interactions
- Air Quality and Health Impacts
- Geological and Geophysical Studies
- Geological formations and processes
United States Geological Survey
2011-2024
Institute of Geochemistry
1999
Pacific Island Ecosystems Research Center
1997
Istituto Nazionale di Geofisica e Vulcanologia
1993
Consorzio Venezia Ricerche
1993
INGV Osservatorio Vesuviano
1993
Domestic coal combustion has had profound adverse effects on the health of millions people worldwide. In China alone several hundred million commonly burn raw in unvented stoves that permeate their homes with high levels toxic metals and organic compounds. At least 3,000 Guizhou Province southwest are suffering from severe arsenic poisoning. The primary source appears to be consumption chili peppers dried over fires fueled high-arsenic coal. Coal samples region were found contain up 35,000...
Mercury (Hg) emissions from coal combustion contribute approximately half of anthropogenic Hg to the atmosphere. With implementation first legally binding UNEP treaty aimed at reducing emissions, identification and traceability different countries/regions are critically important. Here, we present a comprehensive world stable isotope database including 108 new samples major coal-producing deposits in South Africa, China, Europe, India, Indonesia, Mongolia, former USSR, U.S. A 4.7‰ range...
The Greater Olkaria Volcanic Complex is a young (≤ 20 ka) multi-centred lava and dome field dominated by the eruption of peralkaline rhyolites. Basaltic trachytic magmas have been erupted peripherally to complex also form, with mugearites benmoreites, an extensive suite magmatic inclusions in eruptive rocks commonly represent mixed are themselves two-, three- or four-component mixes. All rock types may carry xenocrysts alkali feldspar, less plagioclase, derived from magma mixing...
The Campanian Ignimbrite is a > 200 km3 trachyte–phonolite pyroclastic deposit that erupted at 39·3 ± 0·1 ka within the Campi Flegrei west of Naples, Italy. Here we test hypothesis magma was derived by isobaric crystal fractionation parental basaltic trachyandesitic melt reacted and came into local equilibrium with small amounts (5–10 wt%) crustal rock (skarns foid-syenites) during crystallization. Comparison observed compositions results phase equilibria assimilation–fractionation...
Research Article| September 01, 2007 Quantitative model for magma degassing and ground deformation (bradyseism) at Campi Flegrei, Italy: Implications future eruptions Robert J. Bodnar; Bodnar 1Department of Geosciences, Virginia Polytechnic Institute State University, 4044 Derring Hall, Blacksburg, 24061, USA Search other works by this author on: GSW Google Scholar Claudia Cannatelli; Cannatelli Benedetto De Vivo; Vivo 2Dipartimento di Scienze della Terra, Università Napoli Federico II, Via...
Soufriere volcano of St Vincent (<0.6 Ma) is composed basalts and basaltic andesites, the most mafic which (mg-number 75) may be representative parental magmas calc-alkaline suites Lesser Antilles arc. Parental, possibly primary, at had MgO ∼12.5 wt % were probably nepheline-normative. They last equilibrated with mantle ∼17 kbar pressure, temperatures around 1130°C f(O2) exceeding FMQ (fayalite–magnetite–quartz) + 1. fractionated, along several liquid lines descent, through to andesites...
Tourmaline is a widespread mineral in the Mesoproterozoic Blackbird Co-Cu-Au-Bi-Y-REE district, Idaho, where it occurs both mineralized zones and wallrocks.We report here major-element B-isotope compositions of tourmaline from stratabound sulfide deposits their metasedimentary wallrocks, barren breccia pipes, late quartz veins, granite.Tourmalines are aluminous, intermediate schorldravite with Fe/(Fe+Mg) ratios 0.30 to 0.85 10 % 50 X-site vacancies.Compositional zoning prominent only...
Several recent models that have been put forth to explain bradyseism at Campi Flegrei (CF), Italy, are discussed. Data obtained during long-term monitoring of the CF volcanic district has led development a model based on lithological-structural and stratigraphic features produce anisotropic heterogeneous permeability showing large variations both horizontally vertically; these data inconsistent with in which is driven exclusively by shallow magmatic intrusions. events cyclical...
Abstract The composition of chevkinite and perrierite, the most common members group, is closely expressed by formula A 4 B C 2 D Si O 22 , where = (La,Ce,Ca,Sr,Th), Fe 2+ (Fe ,Fe 3+ ,Ti,Al,Zr,Nb) Ti. site dominated a strong negative correlation between (Ca+Sr) REE . Chondrite-normalized patterns are very variable, e.g. in LREE/HREE Eu/Eu*. Ti, Al variable proportions. Most chevkinites perrierites close to stoichiometric, with cation sums 12.9 13.5, compared theoretical 13. There no single,...