1989, Granites and Rhyolites 2013
DOI: 10.1002/9781118782057.ch11
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Geochemistry and Petrology of Mid-Tertiary Ash Flow Tuffs from the Sierra El Virulento Area, Eastern Chihuahua, Mexico

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Cited by 2 publications
(2 citation statements)
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“…It is well known that variations in bulk‐rock Sr isotopes are thought to reflect combinations of hydrothermal alteration, crustal contamination, and variable source compositions (Beard, ; Davies & Halliday, ; Hildreth & Fierstein, ; Johnson, ; Johnson, Lipman, & Czamanske, ; Mikoshiba, Kanisawa, Matsuhisa, & Togashi, ; Moll, ). In this case, Sr‐rich plagioclases from the shoshonitic samples show low and uniform 87 Sr/ 86 Sr ratios (0.7036–0.7040), consistent with the whole‐rock Sr‐isotope compositions ( 87 Sr/ 86 Sr = 0.7037–0.7039), and this phenomenon could rule out the possibility of significant crustal contamination.…”
Section: Discussionmentioning
confidence: 99%
“…It is well known that variations in bulk‐rock Sr isotopes are thought to reflect combinations of hydrothermal alteration, crustal contamination, and variable source compositions (Beard, ; Davies & Halliday, ; Hildreth & Fierstein, ; Johnson, ; Johnson, Lipman, & Czamanske, ; Mikoshiba, Kanisawa, Matsuhisa, & Togashi, ; Moll, ). In this case, Sr‐rich plagioclases from the shoshonitic samples show low and uniform 87 Sr/ 86 Sr ratios (0.7036–0.7040), consistent with the whole‐rock Sr‐isotope compositions ( 87 Sr/ 86 Sr = 0.7037–0.7039), and this phenomenon could rule out the possibility of significant crustal contamination.…”
Section: Discussionmentioning
confidence: 99%
“…3.7) definitely represents titanomagnetites from a silicic volcanic source, with the three titanomagnetite analyses from a silicic tuff plotting in this field. 'Comnariilon,'of Vdlq4g, $titro.fci,t'lfllfy iilnrimg Ex'traotflon (v.a[ue* -tt a Titanomagnetite analyses comparable to those presented here have been reported from k.own dacitic and rhyolitic tuffs (ronn 1970;Moll 1981;Froggatt 1982:' Westgat€ et at. 1985.…”
Section: Sourcesupporting
confidence: 72%