Analcime phenocrysts in igneous rocks: primary or secondary?

H. R. Karlsson, R. N. Clayton

Research output: Contribution to journalArticle

34 Scopus citations

Abstract

The origin of analcime phenocrysts in volcanic rocks is problematic. Are they primary minerals crystallized directly from melts or are they secondary minerals formed from preexisting igneous minerals, such as leucite? To address this question, stable isotope (H, N, O), electron microprobe, and ion microprobe data has been obtained for analcime-bearing samples from the Crowsnest Formation in Canada and the Colima volcanic complex in Mexico. Isotopic ratios were obtained for the framework (δ18Of) and the channel water (δ18Ocw, δD) for two Crowsnest samples and one Colima sample. Collectively our data for the Crowsnest and Colima samples favor a secondary origin for analcime in these rocks. -from Authors

Original languageEnglish
Pages (from-to)189-199
Number of pages11
JournalAmerican Mineralogist
Volume76
Issue number1-2
StatePublished - 1991

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