Mineralogy, Petrology, and Magmatic Conditions from the Fish Canyon Tuff, Central San Juan Volcanic Field, Colorado

Phenocryst-poor rhyolites of bimodal, tholeiitic provinces: the Rattlesnake Tuff and implications for mush extraction models

“…The eruption temperature of the Fish Canyon Tuff is between 700-800°C (Whitney and Stormer 1985;Bachmann et al 2002). In contrast, our previous temperature estimates suggest that rhyolite E was 880°C, which conforms with our new estimate of 860°C for rhyolite C. More extreme temperature differences from monotonous ignimbrites are found for example in the rhyolites from the Snake River Plain where eruptive temperatures are mostly in excess of 950°C (Honjo et al 1992).…”

Calcium Isotope Composition of Meteorites, Earth, and Mars

“…Ages and K/Ca compositions of meteorites come from Jarosewich (1990), Kallemeyn et al (1989), Laul et al (1986), Mittlefehldt (1994), Mittlefehldt & Lindstrom (1990), Shih et al (1993), Stolper & McSween (1979), von Michaelis et al (1969, and Warren et al (1999). Igneous rocks from Earth include the following: DM-40 and DM-10 evolved marginal members of the Precambrian Muskox layered intrusion; 81-AZ-WG-1 a Late Cretaceous peraluminous muscovite-bearing granite from the Santa Catalina Mountains of southern Arizona (Farmer & DePaolo 1984); Tsm-7 a strongly welded vitric crystal-poor rhyolitic Tertiary ignimbrite from the early Sapinero Mesa Tuff collected from its type locality near its source the San Juan and Uncompahgre caldera complex, western San Juan volcanic field, Colorado (Simon 2000); Fish Canyon Tuff a slightly welded plagioclase sanidine hornblende quartz crystal-rich Tertiary dacitic ignimbrite collected in Saguache Creek, Colorado some tens of km from its source the La Garita caldera, central San Juan volcanic field (Whitney & Stormer 1985); 83-IB-1 and 83-IB-12 biotite and hornblende-bearing granodiorites from central and northeastern Oregon, respectively (Marshall & DePaolo 1989); BCR-1 a well characterized U.S. Geological Survey standard of Columbia River Basalt, Oregon (Gladney et al 1983); 519-8-3 and 519-95 massive tholeiitic normal-type mid-ocean ridge basalts, dredged from the South Atlantic ridge during the Deep Sea Drilling Project Leg 73 (Dietrich et al 1984); BMR-10 a relatively coarse-grained plagioclase and clinopyroxene phyric basalt from Mount Bangum a Quaternary volcano in the New Britain island arc of Papua New Guinea (DePaolo & Johnson 1979); NM5087 a plagioclase phyric massive tholeiitic normal-type mid-ocean ridge basalt flow unit dredged from the North Atlantic ridge during the expedition at 22…”

The size and frequency of the largest explosive eruptions on Earth

“…This category includes several of the very largest events, no- tably the Fish Canyon Tuff (e.g. Whitney and Stormer 1985;Bachmann et al 2002), the Toba Tuffs (Chesner 1998;Gardner et al 2002) and several Andean ignimbrites (e.g. Cerro Galan: Francis et al 1989;Atana: Lindsay et al 2001b).…”