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- W209568028 abstract "The Katmai volcanic province, Alaska Peninsula, includes the catastrophic 1912 Valley of Ten Thousand Smokes (VTTS) eruption, and five andesite-dacite stratovolcanoes. The VTTS is markedly uniform in /sup 143/Nd//sup 144/Nd (0.51301) and delta/sup 18/O (6.0 per thousands) but has a small but significant variation in /sup 87/Sr//sup 86/Sr (0.70354 in andesite and dacite, 0.70368 in rhyolite). The rhyolite's low Sr content (63 ppm) makes it particularly susceptible to crustal contamination; assimilation of only 1% of Jurassic country rock (0.70480, 400 ppm Sr) is sufficient. Dacite from the 1959 eruption of nearby Mt. Trident and a basalt boulder from the rim of Mt. Katmai are isotopically similar to the VTTS andesite and dacite. Dacite from Mt. Mageik has higher /sup 87/Sr//sup 86/Sr, whereas the least-silicic in situ lava in the region, an andesite from Mt. Griggs, has the lowest /sup 87/Sr//sup 86/Sr (0.70335). The Katmai Province falls within the narrow range of /sup 143/Nd//sup 144/Nd for Quaternary lavas from the Aleutians and SW Alaska Peninsula (0.51298-0.51310) but at the high end of the /sup 87/Sr//sup 86/Sr range. Along with the greater abundance of evolved lavas, this probably reflects progressively thicker crust northward along the Alaska Peninsula, although simple assimilation of uppermore » crust cannot explain all of the isotopic data. Isotopic systematics, and Aleutian-type trace-element patterns (La/Yb > chondrites, high Ba/La), indicate that the parental magmas at Katmai are likewise derived from a time-integrated depleted mantle, recently modified by a component from the subducted slab.« less" @default.
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- W209568028 date "1985-01-01" @default.
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- W209568028 title "Isotope and trace element data bearing of the sources and evolution of magmas in the Katmai region, Alaska" @default.
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