A5022835194- Geochemistry and Geologic Mapping
- Geological and Geochemical Analysis
- Hydrocarbon exploration and reservoir analysis
- Geological Studies and Exploration
- Atmospheric and Environmental Gas Dynamics
- Geology and Paleoclimatology Research
- Geochemistry and Elemental Analysis
- Heavy metals in environment
- Paleontology and Stratigraphy of Fossils
- earthquake and tectonic studies
- Geophysical and Geoelectrical Methods
- Radioactive element chemistry and processing
- Geomagnetism and Paleomagnetism Studies
- Geological formations and processes
- Isotope Analysis in Ecology
- Water Quality and Resources Studies
- Groundwater and Isotope Geochemistry
- Analytical chemistry methods development
- Mine drainage and remediation techniques
- Geochemistry and Geochronology of Asian Mineral Deposits
- Remote-Sensing Image Classification
- Mineral Processing and Grinding
- Geological Modeling and Analysis
- Marine and environmental studies
- Archaeology and Natural History
United States Geological Survey
2012-2023
Denver Federal Center
1992-2023
Georgia State University
1992
The Red Dog Zn-Pb deposits are hosted in organic-rich mudstone and shale of the Mississippian Kuna Formation. A complex mineralization history is defined by four sphalerite types or stages: (1) early brown sphalerite, (2) yellow-brown (3) red-brown (4) late tan sphalerite. Stages 2 3 constitute main ore-forming event volumetrically most important. Sulfides stages 1 were deposited with barite, whereas stage largely replaces barite. Distinct chemical differences exist among different From to...
New Re-Os data for chalcopyrite, bornite, and pyrite from the carbonate-hosted Cu deposit at Ruby Creek (Bornite), Alaska, show extremely high Re abundances (hundreds of ppb, low ppm) contain essentially no common Os. The provide first absolute ages ore formation Cu-(Co) demonstrate that systematics pyrite, bornite are unaffected by greenschist metamorphism. main phase mineralization predominantly occurred 384 ± 4.2 Ma, with an earlier possibly ~400 Ma. consistent observed paragenetic...
Analyses of sphalerite samples from shale-hosted massive sulfide and stratigraphically underlying vein breccia deposits in the Red Dog district northern Alaska show a range δ 66Zn values zero to 0.60 per mil. The lowest are observed deposits, overlying (but structurally displaced) systematic trend increasing south north (Main-Aqqaluk-Paalaaq-Anarraaq). inversely correlated with Fe/Mn ratio also tend be higher low Cu sphalerite, consistent precipitation lower closer principal hydrothermal...
Far field features of ore deposits include mineralogical, geochemical, or biological attributes that can be recognized beyond the obvious limits deposits. They primary, if formed in association with mineralization alteration processes, secondary, from interaction hydrosphere and biosphere. This paper examines a variety far different deposit types considers novel applications to exploration discovery. Primary mineral rock chemistry, isotopic element halos, fluid pathways thermal anomalies...
The Red Dog sediment-hosted deposit in the De Long Mountains of northern Alaska is largest Zn producer world. Main stage mineralization characterized by massive sulfide ore and crosscutting subvertical veins. Although vein clearly younger than ore, exact temporal relationship between two unclear. Re-Os geochronology pyrite used to determine absolute age main at Dog. A 10-point isochron on both yields an 338.3 ± 5.8 Ma interpreted represent ore. data indicate that types are coeval within...
The Red Dog Zn-Pb-Ag district in the western Brooks Range, northern Alaska, contains numerous shale-hosted Zn-Pb sulfide and barite deposits organic-rich siliceous mudstone shale, chert, carbonate rocks of Carboniferous Kuna Formation. giant consist a cluster four orebodies (Main, Qanaiyaq, Aqqaluk, Paalaaq) that lie within distinct thrust panels offset single ore deposit during Mesozoic Brookian orogeny. These Zn-Pb-Ag-barite contain one world’s largest reserves resources zinc. Fluid...
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 Porphyry Cu indicator minerals are mineral species in clastic sediments that indicate the presence of mineralization and hydrothermal alteration associated with porphyry skarn deposits. recovered from shallow till samples near giant Pebble Cu-Au-Mo deposit SW Alaska, USA, include apatite, andradite garnet, Mn-epidote, visible gold, jarosite, pyrite, cinnabar. Sulphide other than pyrite absent till, most likely due to oxidation till. The distribution abundant apatite cinnabar suggest...
Abstract The North Australian Zinc Belt is the largest zinc-lead province in world, containing three of ten known individual deposits (HYC, Hilton-George Fisher, and Mount Isa). Northern Cordillera America second province, a further two world’s top (Red Dog Howards Pass). Despite this world-class endowment, exploration both mineral provinces during past 2 decades has not been particularly successful, yielding only significant discoveries (Teena, Australia, Boundary, Canada). One most...
The Cripple Creek district (653 metric tons (t) of Au) consists Au-Te veins and disseminated gold deposits that are spatially related to alkaline igneous rocks in an Oligocene intrusive complex. Vein paragenesis includes quartz-biotite-K feldspar-fluorite-pyrite followed by base metal sulfides telluride minerals. Disseminated consist microcrystalline native with pyrite associated zones pervasive adularia.New 40 Ar/ 39 Ar dates indicate there was a complex magmatic hydrothermal history....
Sulfur and oxygen isotope analyses have been obtained for barite samples from the giant stratiform sulfide-barite deposits at Red Dog in western Brooks Range of Alaska, deposits elsewhere Red district, vein breccia barite occurrences central Range. Twelve 15 deposits studied lie within middle to Upper Mississippian black shale chert units. The data reveal two different patterns on δ 34 S versus 18 O plots. The first, which is best illustrated by deposit at Anarraaq, shows linear trends with...
The Anarraaq deposit in northern Alaska consists of a barite body, estimated to be as much 1 billion metric tons, and Zn-Pb-Ag massive sulfide zone with an resource about 18 Mt at percent Zn, 5.4 Pb, 85 g/t Ag. minerals are hosted by the uppermost part Mississippian Kuna Formation (Ikalukrok unit) that carbonaceous siliceous mudstone or shale interbedded carbonate. amount carbonate is atypical district whole, comprising one third section. total thickness Ikalukrok unit considerably greater...
First posted December 19, 2017 For additional information, contact: Mineral Resources Program Coordinator U.S. Geological Survey 913 National Center Reston, VA 20192Email: minerals@usgs.gov https://minerals.usgs.gov Vanadium is used primarily in the production of steel alloys; as a catalyst for chemical industry; making ceramics, glasses, and pigments; vanadium redox-flow batteries (VRBs) large-scale storage electricity. World resources 2012 were estimated to be 63 million metric tons, which...
Pb and Sr isotope data were obtained on the shale-hosted Zn-Pb-Ag Red Dog deposits (Qanaiyaq, Main, Aqqaluk, Paalaaq), other shale-hosted near Dog, sulfide barite deposits in the western central Brooks Range. The other shale-hosted are hosted Mississippian Kuna Formation, which is underlain by a sequence of marine-deltaic clastic rocks of the Upper Devonian to Lower Endicott Group. Ag-Pb-Zn vein-breccias are found Galena formed during main mineralization stages from Anarraaq Wulik...
Geochemical analyses of major, trace, and rare earth elements (REE) in more than 200 samples variably silicified altered wall rocks, massive banded sulfide, silica rock, sulfide-rich unmineralized barite were obtained from the Main, Aqqaluk, Anarraaq deposits Red Dog Zn-Pb-Ag district northern Alaska. Detailed lithogeochemical profiles for two drill cores at Aqqaluk display an antithetic relationship between SiO2/Al2O3 TiO2/Zr which, together with textural information, suggest preferential...
Aeromagnetic data are used to better understand the geology and mineral resources near Late Cretaceous Pebble porphyry Cu-Au-Mo deposit in southwestern Alaska. The reduced-to-pole (RTP) transformation of regional-scale aeromagnetic shows that is within a cluster magnetic anomaly highs. Similar Pebble, Iliamna, Kijik, Neacola copper occurrences highs trend northeast along crustal-scale Lake Clark fault. A high-amplitude, short- moderate-wavelength centered over Kemuk occurrence, an...
We combined aeromagnetic, induced polarization, magnetotelluric, and gravity surveys as well drillhole geologic, alteration, magnetic susceptibility, density data for exploration characterization of the Cu-Au-Mo Pebble porphyry deposit. This undeveloped deposit is almost completely concealed by postmineralization sedimentary volcanic rocks, presenting an challenge. Individual geophysical methods primarily assist regional characterization. Positive chargeability conductivity anomalies are...
Exploration geochemical and mineralogical studies by the U.S. Geological Survey at Pebble porphyry Cu-Au-Mo deposit were designed to (1) determine whether concealed can be detected with surface samples, (2) better understand processes of metal migration from surface, (3) test existing methods for assessing mineral resources and/or develop new ones. Surface water (ponds, streams, springs), pond stream sediment, soils subjected various leaching techniques, glacial till samples collected. The...