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NARROW
GeoRef Subject
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all geography including DSDP/ODP Sites and Legs
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Mexico
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Popocatepetl (1)
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North America (1)
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Railroad Valley (1)
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United States
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Nevada
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Nye County Nevada
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Grant Canyon Field (1)
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New Mexico
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Jemez Mountains (3)
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Los Alamos County New Mexico (1)
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Pajarito Plateau (1)
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Sandoval County New Mexico (3)
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Valles Caldera (4)
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commodities
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energy sources (1)
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geothermal energy (1)
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metal ores
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gold ores (1)
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molybdenum ores (2)
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silver ores (1)
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oil and gas fields (1)
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petroleum (1)
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elements, isotopes
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carbon
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isotope ratios (2)
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Al-26 (1)
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Be-10 (1)
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beryllium
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Al-26 (1)
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oxygen
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igneous rocks
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igneous rocks
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plutonic rocks
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ultramafics
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dunite (1)
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volcanic rocks
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pyroclastics
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rhyolite tuff (1)
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volcanic ash (1)
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metamorphic rocks
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minerals
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illite (1)
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sulfides
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Primary terms
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absolute age (3)
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atmosphere (1)
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carbon
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C-13/C-12 (2)
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Cenozoic
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Quaternary
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Holocene (1)
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Pleistocene (1)
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Tertiary
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Neogene
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Miocene
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upper Miocene (1)
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clay mineralogy (1)
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economic geology (2)
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faults (1)
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geochemistry (3)
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geochronology (3)
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geothermal energy (1)
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heat flow (1)
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hydrogeology (1)
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igneous rocks
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plutonic rocks
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ultramafics
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peridotites
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dunite (1)
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volcanic rocks
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pyroclastics
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ash-flow tuff (1)
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rhyolite tuff (1)
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inclusions
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fluid inclusions (2)
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isotopes
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radioactive isotopes
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Al-26 (1)
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Be-10 (1)
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stable isotopes
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C-13/C-12 (2)
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O-18/O-16 (2)
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S-34/S-32 (1)
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magmas (1)
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metal ores
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gold ores (1)
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molybdenum ores (2)
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silver ores (1)
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metals
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alkaline earth metals
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beryllium
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Be-10 (1)
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magnesium (1)
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aluminum
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Al-26 (1)
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metamorphic rocks
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metaigneous rocks
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serpentinite (1)
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metasomatic rocks
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serpentinite (1)
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metasomatism (3)
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Mexico
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Popocatepetl (1)
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mineral deposits, genesis (2)
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North America (1)
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oil and gas fields (1)
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oxygen
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O-18/O-16 (2)
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paragenesis (1)
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petroleum (1)
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petrology (1)
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pollution (1)
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sedimentary rocks
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carbonate rocks
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dolostone (1)
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travertine (1)
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springs (2)
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sulfur
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S-34/S-32 (1)
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tectonics
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neotectonics (1)
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thermal waters (2)
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United States
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Nevada
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Nye County Nevada
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Grant Canyon Field (1)
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New Mexico
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Jemez Mountains (3)
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Los Alamos County New Mexico (1)
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Pajarito Plateau (1)
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Sandoval County New Mexico (3)
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Valles Caldera (4)
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volcanology (1)
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rock formations
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Santa Fe Group (1)
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sedimentary rocks
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sedimentary rocks
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carbonate rocks
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dolostone (1)
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travertine (1)
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Spatial and temporal trends in pre-caldera Jemez Mountains volcanic and fault activity
Carbon dioxide sequestering using ultramafic rocks
Geochemical surveillance of magmatic volatiles at Popocatépetl volcano, Mexico
Geology and Geothermal Origin of Grant Canyon and Bacon Flat Oil Fields, Railroad Valley, Nevada
Quaternary erosion and cosmic-ray-exposure history derived from 10 Be and 26 Al produced in situ—An example from Pajarito plateau, Valles caldera region
Gas Geochemistry and Guide for Geothermal Features in the Clear Lake Region, California
Abstract Thermal/mineral waters of the Clear Lake region, California are among the most challenging geothermal fluids in the world to study because they display enormous chemical and isotopic diversity and do not geochemically resemble fluids in typical, high-temperature (≥200°C) geothermal systems (Goff et al., 1993a, 1993b). The Clear Lake region contains no boiling hot springs, hot fumaroles, or springs actively depositing sinter, features commonly linked with high-temperature reservoirs. Regionally, the fluids display tremendous variations in chemical and isotopic composition, caused more by variations in bedrock composition than by subjacent magmatic heat sources (Goff et al., 1977; Thompson et al., 1981a; 1992; Donnelly-Nolan et al., 1993). The distribution of fluids is roughly coincident with the late Tertiary and Quaternary Clear Lake volcanic field (2.1 Ma to 10 ka; Donnelly-Nolan et al., 1981; Hearn et al., 1981). The region lies northeast of The Geysers steam field, the largest geothermal field in the world, yet drilling of approximately 25 exploration wells has not found a commercially exploitable geothermal system. Because conditions in most of these wells are very hot (≥200°C at 2000 m) but relatively impermeable, the Clear Lake region is rated as one of the best hot dry rock geothermal prospects in the United States (Goff and Decker, 1983). Gas geochemistry is becoming more widely used for geothermal prospecting, especially in areas where spring chemistry is ambiguous or where spring waters are not directly derived from deep reservoirs (Goff et al., 1985; 1991; Janik et al, 1991; 1992). Geothermal gases commonly originate from