A5077134714- Geochemistry and Geologic Mapping
- Geological and Geochemical Analysis
- Geochemistry and Elemental Analysis
- Geomagnetism and Paleomagnetism Studies
- earthquake and tectonic studies
- Groundwater and Isotope Geochemistry
- Mineralogy and Gemology Studies
- Pleistocene-Era Hominins and Archaeology
- Coal and Its By-products
- Mining Techniques and Economics
- Geological and Geophysical Studies Worldwide
- Statistics Education and Methodologies
- Hydrocarbon exploration and reservoir analysis
- Soil erosion and sediment transport
- Mineral Processing and Grinding
- Geology and Paleoclimatology Research
- Coal Properties and Utilization
- Hydrology and Watershed Management Studies
- Aquatic and Environmental Studies
- Hydrology and Sediment Transport Processes
- Karst Systems and Hydrogeology
National Energy Technology Laboratory
2023
Bureau of Economic Analysis
2023
University of Michigan
2016-2020
South Carolina Department of Natural Resources
2016
United States Geological Survey
2016
Abstract The genetic link between magmas and ore deposit formation is well documented by studies of fossil hydrothermal systems associated with magmatic intrusions at depth. However, the role explosive volcanic processes as active agents mineralization remains unexplored owing to fact that metals volatiles are released into atmosphere during eruption arc volcanoes. Here, we draw on observations uniquely preserved El Laco iron in Central Andes shed new light metallogenic volcanism operates a...
Coal is increasingly evaluated as a source of rare earth elements (REEs) in the United States to address overreliance on imported REEs. The objective this study was assess distribution REEs lignites from selected mining areas Texas Gulf Coastal Plain region. Thirty-one archived lignite and rock samples previously collected by U.S. Geological Survey were analyzed for their element critical mineral content. These include one core (5400 5500 horizons) two opencast mines (Gibbons Creek 3500 4500...
New O and Fe stable isotope ratios are reported for magnetite samples from high-grade massive of the Mesoproterozoic Pea Ridge Pilot Knob magnetite-apatite ore deposits these results compared with data other iron oxide-apatite to shed light on origin southeast Missouri deposits. The δ 18 values ( n = 12) 3) range 1.0 7.0 3.3 6.7‰, respectively. 56 10) 6) 0.03 0.35 0.06 0.27‰, These suggest that crystallized a silicate melt (typical igneous ranges 0.06–0.49‰) grew in equilibrium...
Abstract The textures of outcrop and near-surface exposures the massive magnetite orebodies (>90 vol % magnetite) at Plio-Pleistocene El Laco iron oxide-apatite (IOA) deposit in northern Chile are similar to basaltic lava flows have compositions that overlap high- low-temperature hydrothermal magnetite. Existing models—liquid immiscibility complete metasomatic replacement andesitic flows—attempt explain genesis by entirely igneous or processes. Importantly, those models were developed...
Abstract The Plio-Pleistocene El Laco iron oxide-apatite (IOA) orebodies in northern Chile are some of the most enigmatic mineral deposits on Earth, interpreted to have formed as lava flows or by hydrothermal replacement, two radically different processes. Field observations provide support for both processes, but ultimately fail explain all observations. Previously proposed genetic models based and study outcrop samples include (1) magnetite crystallization from an erupting immiscible Fe-...
Iron oxide-apatite (IOA) and iron oxide-copper-gold deposits (IOCG) are often spatially temporally related with one another coeval magmatism. However, a genetic model that accounts for observations of natural systems remains elusive, few observational data able to distinguish among working hypotheses invoke meteoric fluid, magmatic-hydrothermal immiscible melts. Here, we use high-resolution trace element concentrations in magnetite, hematite pyrite, high-precision Fe O stable isotope...
Society of Economic Geologists American Association Petroleum University Michigan System NSF EAR grants 1250239 1264560 Chile's Millennium Science Initiative (MSI) through Nucleus for Metal Tracing along Subduction NC130065 Comision Nacional de Investigacion Cientifica y Tecnologica (CONICYT) CONICYT FONDECYT 1140780 grant 1822977