A5084173975- Geochemistry and Geologic Mapping
- Geological and Geochemical Analysis
- Geological Studies and Exploration
- Hydrocarbon exploration and reservoir analysis
- Atmospheric and Environmental Gas Dynamics
- Heavy metals in environment
- Geological Modeling and Analysis
- Radioactive element chemistry and processing
- Remote-Sensing Image Classification
- Geophysical and Geoelectrical Methods
- Geology and Paleoclimatology Research
- earthquake and tectonic studies
- Mineral Processing and Grinding
- High-pressure geophysics and materials
- Advanced Computational Techniques and Applications
- Mineralogy and Gemology Studies
- Hydrology and Watershed Management Studies
- Methane Hydrates and Related Phenomena
- Geomagnetism and Paleomagnetism Studies
- Groundwater and Isotope Geochemistry
- NMR spectroscopy and applications
- Metal Extraction and Bioleaching
- Arsenic contamination and mitigation
- Flood Risk Assessment and Management
- Mine drainage and remediation techniques
Wisconsin Geological and Natural History Survey
2024
United States Geological Survey
2008-2023
Geology, Geophysics, and Geochemistry Science Center
2023
Denver Federal Center
2015-2023
Colorado School of Mines
2012
The U.S. Geological Survey tested the utility of imaging spectroscopy (also referred to as hyperspectral remote sensing) an aid regional mineral exploration efforts in parts Alaska. Airborne spectrometer data were collected 2014 over unmined porphyry Cu deposits eastern Alaska Range using HyMap™ sensor. Maps distributions predominant minerals, made by matching reflectance signatures remotely sensed reference spectra shortwave infrared region, do not uniquely discriminate individual rock...
Demand for critical raw materials is expected to accelerate over the next few decades due continued population growth and shifting consumption patterns of global economy. Sedimentary basins are important sources new discoveries sediment–hosted Mississippi Valley–type (MVT) and/or clastic–dominated (CD) Zn–Pb deposits likely required mitigate future supply chain disruptions Zn, Pb, Ag, Cd, Ga, Ge, Sb, In. Herein we integrate public geoscience datasets using a discrete grid system model...
Abstract Geological maps are powerful models for visualizing the complex distribution of rock types through space and time. However, descriptive information that forms basis a preferred map interpretation is typically stored in geological databases as unstructured text data difficult to use practice. Herein we apply natural language processing (NLP) geoscientific from Canada, U.S., Australia address knowledge gap. First, descriptions, ages, lithostratigraphic lithodemic information, other...
ABSTRACT The Zn–Pb–Ag metallogenic province of the western and central Brooks Range, Alaska, contains two distinct but mineralogically similar deposit types: shale-hosted massive sulphide (SHMS) smaller vein-breccia occurrences. Recent investigations Red Dog Anarraaq SHMS deposits demonstrated that these are characterized by high trace-element concentrations As, Ge, Sb Tl. This paper examines geochemistry additional (Drenchwater Su-Lik) to determine which trace elements ubiquitously elevated...
The northern margin of the Helena Embayment contains extensive syngenetic to diagenetic massive pyrite horizons that extend over 25 km along Volcano Valley-Buttress fault zone and up 8 basinward (south) within Mesoproterozoic Newland Formation. Sheep Creek Cu-Co deposit occurs a structural block bend in system, where replacement-style chalcopyrite mineralization is spatially associated mostly with two stratigraphically lowest zones. These mineralized pyritic are intercalated debris flows...
Abstract New U-Pb and 40Ar/39Ar ages integrated with geologic mapping observations across the western Alaska Range constrain distribution tectonic setting of Cretaceous to Oligocene magmatism along an evolving accretionary plate margin in south-central Alaska. These rocks were emplaced basement domains that include Neoproterozoic Jurassic carbonate siliciclastic strata Farewell terrane, Triassic plutonic volcanic Peninsular Kahiltna assemblage. Plutonic different also host economic...
Abstract Attempts to geochemically distinguish between metamorphic-hydrothermal systems that form orogenic gold deposits and both reduced oxidized magmatic-hydrothermal using isotopes or metal associations have proven ambiguous, particularly for intrusion-related systems. The absence of conclusive geochemical discriminators the overlap in geologic characteristics led deposit models being potentially incorrectly applied, which turn negatively affect regional mineral exploration mine planning....
The knowledge of the Magnetical Variation is such consequence to mariner, that without it he cannot know his course; and were Theory thereof once established, might be great use for estimating Longitude in several Parts World, as has been often very justly observed by others. But ’till this determin’d, we must rely upon Observations.
Using imaging spectrometers at multiple scales, the USGS, in collaboration with University of Alaska, is examining application hyperspectral data for identifying large-tonnage, base metal-rich deposits Alaska. Recent studies have shown this technology can be applied to regional mineral mapping [1] and valuable more local exploration [2]. Passive optical remote sensing high latitude regions faces many challenges, which include a short acquisition season poor illumination due low solar...
In the past two decades, significant research efforts have been devoted to porphyry copper indicator mineral (PCIM) identification and chemistry assist exploration. Such studies are important in Yukon-Tanana upland region of eastern Alaska because well-established geochemical exploration techniques, such as geochemistry stream-sediment samples, less effective search for resources owing cover materials that subdue signatures. The unglaciated is well-endowed with resources, including Cu-Mo-Au...
Abstract The Taurus porphyry Cu-Mo district contains four mineralized centers in the eastern interior of Alaska. All were emplaced during a magmatic episode that spanned from ca. 72 to 67 Ma, with seven distinct igneous suites. Each suite resulted hydrothermal alteration and mineralization, younger pulses overprinting older pulses. magmatic-hydrothermal system is not present at all centers. Apart Dennison occurrence, each center records repeated intermediate-silicic magmatism associated...
This report presents isotopic age data from mineralized granitic plutons in an area of the Alaska Range located approximately 200 kilometers to west-northwest Anchorage southwestern Alaska. Uranium-lead and trace element concentrations zircons were determined for 12 samples encompassing eight plutonic bodies ranging 76 57.4 millions years ago (Ma). Additionally, a rhenium-osmium molybdenite Miss Molly molybdenum occurrence is reported (approx. 59 Ma). All this study host gold-, copper-, (or)...
First posted July 7, 2016 For additional information, contact: U.S. Geological SurveyDirector, Crustal Geophysics and Geochemistry Science Center Box 25046, MS-973 Denver Federal Denver, CO 80225-0046http://crustal.usgs.gov Alaska is a major producer of base precious metals has high potential for undiscovered mineral resources. However, discovery hindered by Alaska’s vast size, remoteness, rugged terrain. New methods are needed to overcome these obstacles in order fully evaluate geology...
The foothills of the Brooks Range contain an enormous accumulation zinc (Zn) in form sulfide and barium (Ba) barite Carboniferous shale, chert, mudstone. Most resources reserves Zn occur Red Dog deposit others district; these surpass those most deposits worldwide terms size grade. In addition to lead sulfides (which silver, Ag) barite, correlative strata host phosphate deposits. Furthermore, prolific hydrocarbon source rocks Triassic Early Jurassic age generated considerable amounts...
Tungsten (W) is used in a variety of industrial and technological applications has been identified as critical mineral for the United States, India, European Union, other countries. These countries rely on W imports mostly from China, which leaves them vulnerable to supply disruption. Consequently, U.S. government current initiative understand domestic resource potential. The eastern Alaska portion Yukon-Tanana Upland (YTU), prospective skarn deposits, major source global supply. regional...
The U.S. Geological Survey (USGS) has initiated a multi-disciplinary study investigating the applicability of remote sensing technologies for geologic mapping and identification prospective areas base precious metal deposits in parts Alaska. Kahiltna terrane southwestern Alaska was selected investigation because its known mineral potential additional resources. An assortment is being investigated to aid analysis terrain, includes imaging spectroscopy (hyperspectral sensing), high spatial...