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This dataset consists of 65 magnetotelluric (MT) stations collected in 2015 near Mountain Pass, California. The U.S. Geological Survey acquired these data to create a regional conductivity model near the Mountain Pass mine. This work is in support of characterizing mineral deposits.
Tags: Apparent Resistivity,
California,
Clark Mountain,
Earth Magnetic Field,
GMEGSC, All tags...
Geology, Minerals, Energy, and Geophysics Science Center,
GeoscientificInformation,
Impedance,
Ivanpah,
MRP,
MT,
Magnetotellurics,
Mescal Ranges,
Mineral Resources Program,
Mojave,
Mountain Pass,
Phase,
San Bernardino County,
Time Series,
Tipper,
electromagnetic surveying,
geophysics,
magnetotelluric surveying, Fewer tags
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This dataset contains chemical and isotopic data from 39 produced water samples collected from sealed separators containing water from horizontal hydrocarbon wells in the lower Eagle Ford Group. The samples were collected from Lavaca and Gonzales counties, Texas in December, 2015. All wells had been in production for longer than 6 months and had produced more than 10,000 barrels (~160,000 liters) of water.
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Temporal and spatial sources of silica for chert remain poorly constrained. Modern sources to the worlds oceans include silica in rivers > aeolian (dust) deposition > sea floor vents and submarine weathering. However, changes in aridity and dust flux during the Phanerozoic may explain variations in the ocean silica cycle and times and places of chert formation. The chemistry of fine quartz dust (FQD) provides a chemical mechanism for the transformation of FQD to polymorphs of silica in chert; FQD is readily dissolved, then reprecipitated as Opal-A by either biotic or abiotic processes. An unequivocal relation between increases in dust flux and biogenic opal-A in the western Pacific Ocean during the past 200 kyr...
Tags: Africa,
Energy Resources,
Geochemistry,
International,
Soil Sciences, All tags...
USGS Science Data Catalog (SDC),
aridity,
chalcedony,
chemistry,
chert,
deposition,
dust,
eolian,
flocculates,
gypsum,
loess,
microcrystalline,
opal,
porcellanite,
quartz,
silica polymorphs,
silt,
wind, Fewer tags
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The table contains oxide and cation compositions of olivine grains from drill core of the Duluth Complex, Minnesota. The oxides were determined by electron probe microanalysis (EPMA) and are reported in weight percent (wt%). The cations were calculated based on the oxide compositions and are reported in mole percent (mol%). Olivine is a magnesium iron orthosilicate mineral with the formula (Mg2+, Fe2+)2SiO4. Olivine forms a solid solution series with magnesium (Mg) at one end and iron (Fe) at the other. Forsterite (Mg2SiO4) is the magnesium endmember and fayalite (Fe2SiO4) is the iron endmember. Minor elements can substitute into the crystal structure, such as manganese (Mn) and nickel (Ni). To better understand...
Categories: Data;
Types: Citation;
Tags: Cook County,
Duluth,
Environmental Health,
Geochemistry,
Lake County, All tags...
Mineralogy,
Minnesota,
St. Louis County,
USGS Science Data Catalog (SDC),
electron microscopy,
mineralogy, Fewer tags
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Corescan© Hyperspectral Core Imager Mark III (HCI-III) system data were acquired for hand samples, and subsequent billets made from the hand samples, collected during the U.S. Geological Survey (USGS) 2014, 2015, and 2016 field seasons in the Nabesna area of the eastern Alaska Range. This area contains exposed porphyry deposits and hand samples were collected throughout the region in support of the HyMap imaging spectrometer survey (https://doi.org/10.5066/F7DN435W) (Kokaly and others, 2017a). The HCI-III system consists of three different components. The first is an imaging spectrometer which collects reflectance data with a spatial resolution of approximately 500 nanometers (nm) for 514 spectral channels covering...
Tags: Alaska,
Alaska,
Alaska Range,
Bond Creek,
Canada, All tags...
ENVI,
Environment for Visualizing Images,
MRP,
Mineral Resources Program,
Nabesna,
Nabesna A-2 quadrangle,
Nabesna A-4 quadrangle,
Nabesna B-4 quadrangle,
Nikonda Creek,
Nutzotin Mountains,
Orange Hill,
SWIR,
VNIR,
Valdez-Cordova County,
Wrangell Mountains,
Wrangell–Saint Elias National Preserve,
Yukon Territory,
economy,
geoscientificInformation,
hyperspectral imaging,
imaging spectroscopy,
infrared imaging,
mineral resources,
mineralogy,
remote sensing,
shortwave infrared,
spectroscopy,
visible-near infrared, Fewer tags
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