| Reference Type | Journal (article/letter/editorial) |
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| Title | Chemical effects of deuteric alteration in some Kenyan trachyte lavas |
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| Journal | Mineralogical Magazine | ISSN | 0026-461X |
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| Authors | Jones, W. B. | Author |
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| Year | 1981 (September) | Volume | 44 |
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| Issue | 335 |
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| Publisher | Mineralogical Society |
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| Download URL | https://rruff.info/doclib/MinMag/Volume_44/44-335-279.pdf+ |
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| DOI | doi:10.1180/minmag.1981.044.335.07Search in ResearchGate |
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| Generate Citation Formats |
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| Mindat Ref. ID | 3272 | Long-form Identifier | mindat:1:5:3272:2 |
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| GUID | 0 |
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| Full Reference | Jones, W. B. (1981) Chemical effects of deuteric alteration in some Kenyan trachyte lavas. Mineralogical Magazine, 44 (335) 279-285 doi:10.1180/minmag.1981.044.335.07 |
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| Plain Text | Jones, W. B. (1981) Chemical effects of deuteric alteration in some Kenyan trachyte lavas. Mineralogical Magazine, 44 (335) 279-285 doi:10.1180/minmag.1981.044.335.07 |
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| In | (1981, September) Mineralogical Magazine Vol. 44 (335) Mineralogical Society |
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| Abstract/Notes | AbstractThe Kenyan trachyte volcanoes Kilombe and Londiani show some unusual chemical features. Analyses of elements normally regarded as residual in salic peralkaline rocks do not show the linear covariance characteristic of these elements in other East African volcanoes. The scatter from expected trends is greatest for Y and the lanthanides, less for Nb and Rb, and not apparent for Zr. The lavas also show variable loss of Na, P, and Fe. It is suggested that this chemical deviation is the result of a deuteric event during the later stages of crystallization of the lavas. The flows showing the chemical deviations, in particular negative Ce anomalies, also tend to have their ferroaugite phenocrysts deuterically altered to a mineraloid closely resembling iddingsite.During the crystallization of these trachyte lavas an H2O-, Cl-, and F-rich vapour separates from the liquid. This absorbs some elements, particularly Na, P, Fe, Y, and the lanthanides from the silicate liquid as water-soluble or volatile halides. Some of the absorbed material is redeposited in other parts of the flow and the rest is lost altogether as the vapour escapes from the surface. |
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