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- W2395057324 abstract "The Southern Rocky Mountain volcanic fi eld contains widespread andesite and dacitic lavas erupted from central volcanoes; associated with these are ~26 regional ignimbrites (each 150–5000 km3) 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 batholithscale granitoids. Calderas and plutons are enclosed by one of the largest-amplitude gravity lows in North America. The gravity low, interpreted as defi ning 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 fi eld 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." @default.
- W2395057324 created "2016-06-24" @default.
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- W2395057324 date "2013-01-01" @default.
- W2395057324 modified "2023-09-28" @default.
- W2395057324 title "From ignimbrite to batholith, northeastern San Juan Mountains, Colorado<subtitle>Bonanza, Cochetopa Park, and North Pass calderas</subtitle>" @default.
- W2395057324 doi "https://doi.org/10.1130/2013.0033(14)" @default.
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