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A high 87Sr 86Sr mantle source for low alkali tholeiite, northern Great Basin

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A high 87Sr 86Sr mantle source for low alkali tholeiite, northern Great Basin; 1975; Article; Journal; Geochimica et Cosmochimica Acta; Mark, R. K.; Lee, Hu, C.; Bowman, H. R.; Asaro, F.; McKee, E. H.; Coats, R. R.

Summary

Olivine tholeiites, the youngest Tertiary units (about 8-11 m.y. old) at five widely spaced localities in northeastern Nevada, are geologically related to the basalts of the Snake River Plain, Idaho, to the north and are similar in major element and alkali chemistry to mid-ocean ridge basalts (MORB) and island arc tholeiites. The measured K (1250-3350 ppm), Rb (1??9-6??2 ppm) and Sr (140-240 ppm) concentrations overlap the range reported for MORB. Three of the five samples have low, unfractionated rare earth element (REE) patterns, the other two show moderate light-REE enrichment. Barium concentration is high and variable (100-780 ppm) and does not correlate with the other LIL elements. The rocks have 87Sr/86Sr = 0??7052-0??7076, considerably [...]

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Type Scheme Key
local-index unknown 70009867
local-pk unknown 70009867
series unknown Geochimica et Cosmochimica Acta

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journalGeochimica et Cosmochimica Acta
parts
typevolume
value39
typeissue
value12
languageEnglish
citationTypeArticle

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