| 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. |
| Genre: | Article |
| ProdID: | 70012430 |
| Citation Author: | Miesch, A. T. |
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| Citation End Page: | 371 |
| Citation Issue: | 4 |
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| Citation Language: | English |
| Citation Larger Work Title: | Journal of the International Association for Mathematical Geology |
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| Citation Number Of Pages: | 27 |
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| Citation Search Results Text: | Vector analysis of chemical variation in the lavas of Pari??cutin volcano, Mexico; 1979; Article; Journal; Journal of the International Association for Mathematical Geology; Miesch, A. T. |
| Citation Start Page: | 345 |
| Citation Volume: | 11 |
| Citation Year: | 1979 |
| Type: | citation/reference |
| Text: | Vector analysis of chemical variation in the lavas of Pari??cutin volcano, Mexico; 1979; Article; Journal; Journal of the International Association for Mathematical Geology; Miesch, A. T. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| URL (DIGITAL OBJECT IDENTIFIER): | http://dx.doi.org/10.1007/BF01029294 |
| Date Other: | Mon, 1 Jan 1979 00:00 -0600 |
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