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ash-flow tuff

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ash-flow tuff [′ash‚flō ‚təf]
(petrology)


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1970, Ash-flow tuffs of Precambrian age in Southeast Missouri, Missouri Division of Geology and Land Survey Report of Investigations 46.
The area's geology is fairly typical of the northern Sierra Madre Occidental with structurally disrupted andesite volcanics of the Lower Volcanic Complex (LVC) exposed in the more deeply eroded parts of the district and gently tilted tuffaceous rhyolite ash-flow tuffs of the Upper Volcanic Supergroup (UVS) occupying the higher areas.
The mineralized system consists of one major and several minor northwesterly striking, steeply dipping, sulphide-rich silver-lead-zinc-antimony-gold veins that are hosted in dacitic ash-flow tuffs, agglomerates, and lava flows.
 
 
 
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