By Philip M. Bethke, Peter W. Lipman, Paul B. Barton, Nora K. Foley, David A. Sawyer(auth.)

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Published through the yankee Geophysical Union as a part of the Field journey Guidebooks Series.

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Mineralization in Silicic Calderas: Questa, New Mexico and the San Juan Mountains, Colorado, Taos, New Mexico to Lake City, Colorado, July 20-July 25, 1989

In regards to the ProductPublished via the yankee Geophysical Union as a part of the sector journey Guidebooks sequence. content material:

Extra resources for Mineralization in Silicic Calderas: Questa, New Mexico and the San Juan Mountains, Colorado, Taos, New Mexico to Lake City, Colorado, July 20-July 25, 1989

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This meteoric water differed substantially from the brines in hydrogen, oxygen, dissolved sulfate, and dissolved carbonate isotopic compositions (Rye and others, 1988,' Foley and others, 1989). These northern waters circulated deeply in the northern part of the district and mixed with the southern brines along the sides of the upwelling plume and in the heat-transfer zone in the roots of the system. Precipitation of the ores at the interface between the deep brine and the overlying ground water in the main part of the district appears to have resulted mainly from mixing, and to a lesser degree from boiling.

About 100 meters west along the road, relatively mafic biotite-bearing welded tuffs that are assigned to the informal lower member of the Treasure Mountain underly the lavas of the Conejos Formation. These tuffs are considered to mark the initiation of activity that eventually led to formation of the Platoro caldera and are present locally on most sides of the caldera. The welded tuff section has local weak bedding within it. 0 Curve to left. After curve, a quartz latite porphyry intrusive (64% 8i0 2 ) at 12:00.

Geologic, isotopic, and fluid-inclusion data can be used to constrain the hydrologic environment of the Creede mineralization, and to develop a qualitative model (Figure 3-3), comparable to active geothermal systems. Extensive stable isotope studies (Bethke and Rye, 1979, Rye and others, 1988), and fluid inclusion studies (summarized in Woods and others, 1982 and Hayba and others, 1985; and extended by Foley and others, 1989) indicate that the Creede ores were deposited along the top of a saline, deeply circulating, hydro- Table 3-3: Distict-wide Correlation of Mineral Assembalges.

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Mineralization in Silicic Calderas: Questa, New Mexico and by Philip M. Bethke, Peter W. Lipman, Paul B. Barton, Nora K.
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