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Vector analysis of chemical variation in the lavas of Pari??cutin volcano, Mexico

Journal of the International Association for Mathematical Geology

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DOI: 10.1007/BF01029294

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Abstract

Compositional variations in the lavas of Pari??cutin volcano, Mexico, have been examined by an extended method of Q-mode factor analysis. Each sample composition is treated as a vector projected from an original eight-dimensional space into a vector system of three dimensions. The compositions represented by the vectors after projection are closely similar to the original compositions except for Na2O and Fe2O3. The vectors in the three-dimensional system cluster about three different planes that represent three stages of compositional change in the Pari??cutin lavas. Because chemical data on the compositions of the minerals in the lavas are presently lacking, interpretations of the mineral phases that may have been involved in fractional crystallization are based on CIPW norm calculations. Changes during the first stage are attributed largely to the fractional crystallization of plagioclase and olivine. Changes during the second stage can be explained by the separation of plagioclase and pyroxene. Changes during the final stage may have resulted mostly from the assimilation of a granitic material, as previously proposed by R. E. Wilcox. ?? 1979 Plenum Publishing Corporation.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Vector analysis of chemical variation in the lavas of Pari??cutin volcano, Mexico
Series title:
Journal of the International Association for Mathematical Geology
DOI:
10.1007/BF01029294
Volume
11
Issue:
4
Year Published:
1979
Language:
English
Publisher location:
Kluwer Academic Publishers-Plenum Publishers
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Journal of the International Association for Mathematical Geology
First page:
345
Last page:
371