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NARROW
GeoRef Subject
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all geography including DSDP/ODP Sites and Legs
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Animas River basin (1)
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Primary terms
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absolute age (10)
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Australasia
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brines (1)
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carbon
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Cenozoic
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Quaternary
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upper Pleistocene (2)
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Tertiary
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middle Tertiary (3)
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Paleogene
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Paleocene (1)
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upper Cenozoic (1)
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Chordata
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volcanic rocks
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stable isotopes
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D/H (4)
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deuterium (3)
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Nd-144/Nd-143 (1)
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O-18/O-16 (8)
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Pb-206/Pb-204 (2)
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Mesozoic
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Triassic
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metal ores
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lead
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Pb-206/Pb-204 (2)
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Sangre de Cristo Mountains (2)
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Sonoran Desert (1)
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oxygen
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O-18/O-16 (8)
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Paleozoic
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Carboniferous
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Devonian
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Precambrian
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thermal waters (1)
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United States
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Sierra Nevada Batholith (1)
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Montezuma County Colorado (1)
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Needle Mountains (1)
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Ouray County Colorado (6)
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Rio Grande County Colorado (4)
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Saguache County Colorado (2)
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Silverton Caldera (5)
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San Juan volcanic field (14)
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San Miguel County Colorado (4)
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Sawatch Range (2)
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Colorado Plateau (6)
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Idaho (1)
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Picuris Range (1)
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Socorro County New Mexico
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Taos County New Mexico
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Questa Caldera (2)
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Taos Plateau (1)
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Tusas Mountains (1)
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Paradox Basin (1)
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Southwestern U.S. (1)
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Creede Caldera (5)
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Sangre de Cristo Mountains (2)
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Sawatch Range (2)
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Uinta Mountains (1)
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Wind River Range (1)
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Uncompahgre Uplift (2)
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San Juan Mountains
Recognition and significance of Upper Devonian fluvial, estuarine, and mixed siliciclastic-carbonate nearshore marine facies in the San Juan Mountains (southwestern Colorado, USA): Multiple incised valleys backfilled by lowstand and transgressive systems tracts
Abstract The Southern Rocky Mountain volcanic field contains widespread andesite and dacitic lavas erupted from central volcanoes; associated with these are ~26 regional ignimbrites (each 150–5000 km 3 ) emplaced from 37 to 23 Ma, source calderas as much as 75 km across, and subvolcanic plutons. Exposed plutons vary in composition and size from small roof-zone exposures of porphyritic andesite and dacite to batholith-scale granitoids. Calderas and plutons are enclosed by one of the largest-amplitude gravity lows in North America. The gravity low, interpreted as defining the extent of a largely concealed low-density silicic batholith complex, encloses the overall area of ignimbrite calderas, most of which lack individual geophysical expression. Initial ignimbrite eruptions from calderas aligned along the Sawatch Range at 37–34 Ma progressed southwestward, culminating in peak eruptions in the San Juan Mountains at 30–27 Ma. This field guide focuses on diverse features of previously little-studied ignimbrites and caldera sources in the northeastern San Juan region, which record critical temporal and compositional transitions in this distinctive eastern Cordilleran example of Andean-type continental-margin volcanism.
Geophysical study of the San Juan Mountains batholith complex, southwestern Colorado
The use of fluoride as a natural tracer in water and the relationship to geological features: examples from the Animas River Watershed, San Juan Mountains, Silverton, Colorado
Eruptive and noneruptive calderas, northeastern San Juan Mountains, Colorado: Where did the ignimbrites come from?
Environment of Ore Deposition in the Creede Mining District, San Juan Mountains, Colorado: Part VI. Maximum Duration for Mineralization of the OH Vein
Importance of mechanical disaggregation in chemical weathering in a cold alpine environment, San Juan Mountains, Colorado
Environment of ore deposition in the Creede mining district, San Juan Mountains, Colorado; Part V, Epithermal mineralization from fluid mixing in the OH Vein
Sultan Mountain Mine, western San Juan Mountains, Colorado; a fluid inclusion and stable isotope study
Epithermal Base-Metal and Precious-Metal Systems, San Juan Mountains, Colorado
Abstract Special thanks are due Jim Points, general r.1anager, and Charles Ponchak, chief geologist, for allowling use of maps and records of past and present development and production at Camp Bird mine. Ihformation for this paper has been taken freely from several sources including the author's own work at Camp Bird as geologist. Sources used are Langston, D.J., 1978 and Paul, A.H.; 1974, Colorado School of Mines M.S. theses (unpublished), and Burbank, w.s., 1941, Colorado Sci. Soc. Proc., vol. 14, no. 5, p. 141–261.