Petrology of the 1979 eruption of Soufriere Volcano, St. Vincent, Lesser Antilles

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Authors:Graham, A. M.; Thirlwall, M. F.
Author Affiliations:Primary:
Univ. Edinburgh, Grant Inst. Geol., Edinburgh EH9 3JW, United Kingdom
Volume Title:Contributions to Mineralogy and Petrology
Source:Contributions to Mineralogy and Petrology, 76(3), p.336-342. Publisher: Springer International, Heidelberg-New York, International. ISSN: 0010-7999
Publication Date:1981
Note:In English. 32 refs.; illus. incl. 11 anal., 3 tables, sketch map
Summary:Eight major and trace element analyses and Sr isotope data are used to study the temporal variation in the chemistry of the ejecta from the 1979 eruption of the Soufriere volcano and to compare with compositions of the 1979 and 1971-2 magmas. Both were basaltic andesites almost identical in petrography. A small temporal variation in chemistry is apparent in the 1979 samples, but these cannot be related to the 1971-2 lava by fractional crystallization of phenocryst phases, and the two eruptions may therefore have sampled different batches of magma. Microprobe analyses of phenocryst phases and glasses from the 1979 ejecta indicate that the basaltic andesites are products of fractionation of magnesian parents. A common origin for the St Vincent lavas and the microphyric alkali picrites found to the south in Grenada is suggested. [P.Br.]
Subjects:Alkaline earth metals; Andesites; Basaltic composition; Chemical composition; Eruptions; Fractional crystallization; Geochemistry; Glasses; Igneous rocks; Isotopes; Magmas; Metals; Petrology; Provenance; Sr-87/Sr-86; Stable isotopes; Strontium; Volcanic rocks; Volcanism; Volcanoes; Volcanology; Antilles; Caribbean region; Lesser Antilles; Saint Vincent; Soufriere; West Indies; Eruption 1979
Abstract Numbers:82M/0836
Record ID:1982061697
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom, Reference includes data from PASCAL, Institute de l'Information Scientifique et Technique
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