Research Geologist
Geology, Geophysics, and Geochemistry Science Center
Email:
lemorgan@usgs.gov
Office Phone:
303-236-4729
Fax:
303-236-3200
ORCID:
0000-0001-9930-524X
Location
Building 95
P.O. Box 25585
Denver Federal Center
Lakewood
, CO
80225-0585
US
Supervisor:
Philip L Verplanck
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Ar/Ar data are reported from minerals and rocks that were collected as part of a mineral resource investigation of the Tonopah, Divide, and Goldfield districts in Nevada. Data are reported from 92 samples and associated standards from eight separate neutron irradiations in the Denver USGS TRIGA reactor, including separated mineral grains and whole rocks. Data were collected by infrared laser heating of irradiated samples, either incremental heating or fusion, and analysis by multi-collector mass spectrometry. The reported data have been corrected for blanks, radioactive decay, and interfering nucleogenic reactions associated with sample irradiation.
Categories: Data;
Types: Map Service,
OGC WFS Layer,
OGC WMS Layer,
OGC WMS Service;
Tags: 40Ar/39Ar,
Ar,
Divide district,
Geochemistry,
Goldfield, All tags...
Goldfield district,
Mineralogy,
Nevada,
Nye County,
Structural Geology,
Tonopah,
Tonopah district,
USGS Science Data Catalog (SDC),
USGS TRIGA reactor,
Volcanology,
argon,
geochronology,
gold mineralization,
infrared laser,
mapping,
mass spectrometry,
mineral exploration,
mineralization,
neutron irradiation, Fewer tags
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This dataset accompanies planned publication 'Determining fault geometry through the transport-parallel distribution of thermochronometer cooling ages'. The Ar/Ar data is for samples that record the thermal history of the area. The geochronology provides time constraints for the thermal histories studied in the manuscript. Samples were collected from Nepal, overseen by Nadine McQuarrie (University of Pittsburgh), who sent them to the USGS Denver Argon Geochronology Laboratory for Ar/Ar analysis.
Categories: Data;
Tags: 40Ar/39Ar,
Argon Geochronology Laboratory,
GGGSC,
Geochemistry,
Geology, Geophysics, and Geochemistry Science Center, All tags...
Geophysics,
MRP,
Mineral Resources Program,
Nepal,
Seismology,
U.S. Geological Survey,
USGS,
USGS Science Data Catalog (SDC),
geochronology,
geoscientificInformation,
mass spectroscopy,
radiometric dating, Fewer tags
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This dataset accompanies planned publication 'Detrital record of the Late Oligocene – Early Miocene mafic volcanic arc in the Southern Patagonian Andes (~51°S) from single-clast geochronology and trace element geochemistry'. The Ar/Ar data is for samples that record the detrital sedimentary record of the basin. The geochronology provides time constraints for the sedimentation studied in the manuscript. Samples were collected from the Magallanes-Austral Basin, and collection was supervised by Julie Fosdick, who sent them to the USGS for Ar/Ar analysis.
Categories: Data;
Tags: 40Ar/39Ar,
Argentina,
Argon Geochronology Laboratory,
Chile,
GGGSC, All tags...
Geochemistry,
Geology, Geophysics, and Geochemistry Science Center,
MRP,
Mineral Resources Program,
Patagonia,
Sedimentology,
Stratigraphy,
Structural Geology,
U.S. Geological Survey,
USGS,
USGS Science Data Catalog (SDC),
geochronology,
geoscientificInformation,
mass spectroscopy,
radiometric dating, Fewer tags
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This dataset accompanies publication '40Ar/39Ar geochronology and petrogenesis of the Table Mountain Shoshonites, Golden, CO', to be published in Rocky Mountain Geology, which analyzed lava flows on North and South Table Mountain in Golden, CO, for argon geochronology and geochemistry.
Categories: Data;
Tags: 40Ar/39Ar,
Cretaceous,
Eocene,
GGGSC,
Geology, Geophysics, and Geochemistry Science Center, All tags...
MRP,
Mineral Resources Program,
North Table Mountain,
Paleogene,
Ralston Buttes,
Ralston Dike,
South Table Mountain,
USGS Science Data Catalog (SDC),
atomic emission spectroscopy,
geochemistry,
geochronology,
geoscientificInformation,
mass spectroscopy,
radiometric dating, Fewer tags
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This data release includes 40Ar/39Ar intercalibration data from the U.S. Geological Survey for neutron fluence monitors HD-B1 (Heidelberg biotite) and FCs (Fish Canyon sanidine). Potassium-bearing mineral grains were analyzed by argon geochronology at the U.S. Geological Survey Argon Geochronology Laboratory in Denver, Colorado. These data provide intercalibration information between the two fluence monitors.
Categories: Data;
Tags: 40Ar/39Ar,
<1GB,
Argon Geochronology Laboratory,
Colorado,
Denver, All tags...
GGGSC,
Geology, Geophysics, and Geochemistry Science Center,
Lakewood,
MRP,
Mineral Resource Program,
U.S. Geological Survey,
USGS,
USGS Science Data Catalog (SDC),
United States,
biota,
geochronology,
intercalibration, Fewer tags
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