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- W1814045 abstract "The Sitkoh Bay alkalic plutonic suite consists of six elongate small plutons totaling about 10 km wide by 45 km long on Chichagof Island near Tenakee Springs, southeastern Alaska. The suite, of Silurian or older age, contains a wide variety of rock types, ranging from nepheline syenite, syenite and trondhjemite to quartz monzonite and granite. This report provides majorand minor-element chemical data, including rare-earth elements (REE), for four bodies of the suite: the Kook Lake, Basket Lake, Point Hayes, and Tenakee Springs plutons. Rocks analyzed are samples typical of units mostly obtained from 1960 reconnaissance mapping. This part of Chichagof Island in the early Paleozoic was probably in or near a continental-margin volcanic arc based on the nature of country rocks of the alkalic suite, but the rocks of the suite lack fingerprints of such arc-related magmatism (for example, strong Nb depletion). The magmatism may be related to a rapid switch from subduction or collision to transcurrent tectonic activity, such as recorded for alkalic rocks from other areas. The analytical data show no evidence of significant REE or other element concentrations as are economic in other bodies of this type, but lack of mineral-resource directed sampling precludes data interpretation in terms of economic significance." @default.
- W1814045 created "2016-06-24" @default.
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- W1814045 date "1990-01-01" @default.
- W1814045 modified "2023-09-26" @default.
- W1814045 title "The Sitkoh Bay alkalic plutonic suite: Silurian or older alkalic magmatism on eastern Chichagof Island, southeastern Alaska" @default.
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- W1814045 doi "https://doi.org/10.3133/ofr90297" @default.
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