A5042770569- Geological and Geochemical Analysis
- Geochemistry and Geologic Mapping
- Nuclear materials and radiation effects
- earthquake and tectonic studies
- High-pressure geophysics and materials
- Radioactive element chemistry and processing
- Geochemistry and Elemental Analysis
- Geology and Paleoclimatology Research
- Mineralogy and Gemology Studies
- Geomagnetism and Paleomagnetism Studies
- Geological Studies and Exploration
- Hydrocarbon exploration and reservoir analysis
- Nuclear Materials and Properties
- Luminescence Properties of Advanced Materials
- Minerals Flotation and Separation Techniques
- Paleontology and Stratigraphy of Fossils
- Extraction and Separation Processes
- Glass properties and applications
- Building materials and conservation
- Isotope Analysis in Ecology
- Geological Formations and Processes Exploration
- Nuclear Physics and Applications
- Geochemistry and Geochronology of Asian Mineral Deposits
- Geological and Tectonic Studies in Latin America
- Cultural Heritage Materials Analysis
Memorial University of Newfoundland
2016-2025
Memorial
2023
Argonne National Laboratory
1996-2019
Arizona Geological Survey
2019
University of Arizona
2019
George Washington University
1999-2006
St. John’s Health Sciences Centre
2006
Indiana State University
2003-2005
Purdue University West Lafayette
1999-2005
University of Notre Dame
1999-2000
This paper reports the results from a second characterisation of 91500 zircon, including data electron probe microanalysis, laser ablation inductively coupled plasma‐mass spectrometry (LA‐ICP‐MS), secondary ion mass (SIMS) and fluorination analyses. The focus this initiative was to establish suitability large single zircon crystal for calibrating in situ analyses rare earth elements oxygen isotopes, as well provide working values key geochemical systems. In addition extensive testing...
Research Article| January 02, 2003 Zircon Saturation Thermometry John M. Hanchar; Hanchar Department of Earth and Environmental Sciences, The George Washington University, Washington, DC 20006 Search for other works by this author on: GSW Google Scholar E. Bruce Watson Science, Rensselaer Polytechnic Institute, Troy, New York 12180 Author Article Information Publisher: Mineralogical Society America First Online: 03 Mar 2017 © Of Reviews in Mineralogy Geochemistry (2003) 53 (1): 89–112....
Zircon crystals were grown from a Li-Mo flux (7.5 mol% Li2MoO4; 86.5 MoO3) to which equal molar proportions ZrO2 and Li2SiO3 added (3 each). The initially undoped, but later Dy was the without any other charge-compensating species. With P added, in proportions, zircon incorporated 1.37 (6.99 wt%) 1.36 (1.33 P, factor of 5.3 increase over intentionally flux. P+REE-doped displayed an approximately 1000-fold REE La through Lu, result decreasing ionic radii. incorporation P5+ allowed, general...
Research Article| February 01, 2007 Rare Earth Element Behavior in Zircon-Melt Systems John M. Hanchar; Hanchar 1Department of Sciences, Memorial University Newfoundland, Alexander Murray Building, St. John's, NL A1B 3X5 Canada E-mail: johnh@esd.mun.ca Search for other works by this author on: GSW Google Scholar Wim van Westrenen 2Faculty and Life Vrije Universiteit, De Boelelaan 1085 1081 HV Amsterdam, The Netherlands wim.van.westrenen@falw.vu.nl Elements (2007) 3 (1): 37–42....
Research Article| June 01, 2016 Iron-rich melts, magmatic magnetite, and superheated hydrothermal systems: The El Laco deposit, Chile Fernando Tornos; Tornos * 1Centro de Astrobiología (CSIC-INTA). Ctra. Torrejón a Ajalvir, km 4.5, 28850 Ardoz, Madrid, Spain *E-mails: f.tornos@csic.es, francisco.velasco@ehu.es, jhanchar@mun.ca Search for other works by this author on: GSW Google Scholar Francisco Velasco; Velasco 2Departamento Mineralogía y Petrología, Universidad del País Vasco UPV/EHU,...
Abstract The origins of magnetite-apatite deposits are controversial, and the crux debate is what types fluids form these rocks. We present evidence from 20 worldwide showing ubiquitous involvement molten salts. studied distributed globally, various tectonic settings, Precambrian to Quaternary in age. In every case, water-poor polycrystalline melt inclusions ore-stage minerals dominated by sulfate, chloride, carbonate components plus variable proportions calc-silicates, phosphates, iron ±...
Zircon crystals synthesized in a Li-Mo oxide melt and doped with trivalent lanthanides Y (REE), both without P, were examined by single-crystal X-ray diffraction (XRD). REE are incorporated into the Zr site zircon structure, some appears to be displaced Si site. Crystals middle (MREE, Sm Dy) Y, plus P follow xenotime substitution (REE3+ + P5+ = Zr4+ Si4+) rather closely, whereas heavy (HREE, Er Lu) deviate from substitution, having REE:P atomic ratios significantly greater than one. Xenotime...
Abstract The geology and geochemistry of the El Laco iron oxide deposit (Central Andes, Chile) support a genesis related to ascent, degassing, subvolcanic emplacement an unusual oxidized silica-poor but water-and iron-rich melt that took place during growth host Pliocene-Holocene andesitic volcano. model proposed in this paper for evolution involves formation shallow telescoped magmatichydrothermal system with complex melt-fluid unmixing vertical column less than 1 km. dominant...