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The isotopic and chemical evolution of Mount St. Helens

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The isotopic and chemical evolution of Mount St. Helens; 1983; Article; Journal; Earth and Planetary Science Letters; Halliday, A. N.; Fallick, A. E.; Dickin, A. P.; Mackenzie, A. B.; Stephens, W. E.; Hildreth, W.

Summary

Isotopic and major and trace element analysis of nine samples of eruptive products spanning the history of the Mt. St. Helens volcano suggest three different episodes; (1) 40,000-2500 years ago: eruptions of dacite with ??{lunate}Nd = +5, ??{lunate}Sr = -10, variable ??18O, 206Pb/204Pb ??? 18.76, Ca/Sr ??? 60, Rb/Ba ??? 0.1, La/Yb ??? 18, (2) 2500-1000 years ago: eruptions of basalt, andesite and dacite with ??{lunate}Nd = +4 to +8, ??{lunate}Sr = -7 to -22, variable ??18O (thought to represent melting of differing mantle-crust reservoirs), 206Pb/204Pb = 18.81-18.87, variable Ca/Sr, Rb/Ba, La/Yb and high Zr, (3) 1000 years ago to present day: eruptions of andesite and dacite with ??{lunate}Nd = +6, ??{lunate}Sr = -13, ??18O ???6???, [...]

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local-index unknown 70011362
local-pk unknown 70011362
series unknown Earth and Planetary Science Letters

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citationTypeArticle
journalEarth and Planetary Science Letters
languageEnglish
parts
typevolume
value63
typeissue
value2

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