Chemical classification of volcanic rocks based on the total alkali-silica diagram

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Authors:Le Bas, M. J.; Le Maitre, R. W.; Streckeisen, A.; Zanettin, B. A.
Author Affiliations:Primary:
Univ. Leicester, Dep. Geol., Leicester, United Kingdom
Univ. Melbourne, Australia
Manuelstrasse, Bern, Switzerland
Univ. Padova, Italy
Volume Title:Journal of Petrology
Source:Journal of Petrology, 27(3), p.745-750. Publisher: Clarendon Press, Oxford, United Kingdom. ISSN: 0022-3530
Publication Date:1986
Note:In English. 23 refs.; illus. incl. 1 table
Summary:This classification, for use when modal analyses are lacking, is on a non-genetic basis using the total alkali-silica diagram and is as nearly consistent as possible with the QAPF modal classification. The diagram has 15 fields, two of which contain two root names which are separated according to other chemical criteria, giving the following 17 root names: basalts, basaltic andesite, andesite, dacite, rhyolite, trachybasalt, basaltic trachyandesite, trachyandesite, trachyte, trachydacite, picrobasalt, basanite, tephrite, phonotephrite, tephriphonolite, phonolite and foidite. Using Na-K criteria, trachybasalt may be divided into hawaiite and potassic trachybasalt, basaltic trachybasalt into mugearite and shoshonite, and trachyandesite into benmoreite and latite. [R.A.H.]
Subjects:Alkalic composition; Associations; Chemical composition; Classification; Igneous rocks; IUGS; Petrology; Silica; Volcanic rocks; Diagrams; Total alkali-silica diagram
Abstract Numbers:87M/1493
Record ID:1988000330
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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