Boninitic lavas in Appalachian ophiolites; a review

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Authors:Coish, R. A.
Author Affiliations:Primary:
Middlebury Coll., Geol. Dep., Middlebury, VT, United States
Volume Title:Boninites
Volume Authors:Crawford, A. J., editor
Source:Boninites, edited by A. J. Crawford, p.264-287. Publisher: Unwin Hyman, London, United Kingdom. ISBN: 0-04-445003-6
Publication Date:1989
Note:In English. 5 refs.; illus. incl. 5 tables, geol. sketch map
Summary:Early Palaeozoic lavas in three volcanic terrains in this area are similar to modern boninites. The lavas are mostly quench-textured pillows with chemical features which match modern boninites but are distinct from Archaean basaltic komatiites. The boninitic lavas are invariably associated with other lavas exhibiting chemical features of island-arc tholeiites and/or MORB. The occurrence of the boninites in Appalachian ophiolites is strong evidence that the ophiolites formed in the vicinity of an early Palaeozoic island arc. The higher-TiO2 lavas associated with the boninitic samples could have formed in a back-arc basin or as island-arc tholeiites. Early Palaeozoic plate models of the Appalachians must take into account the formation of some ophiolites near subduction zones. [R.E.S.]
Subjects:Andesites; Betts Cove Ophiolite; Boninite; Genesis; Igneous rocks; Lava; Lower Paleozoic; Mineral composition; Ophiolite; Ordovician; Paleozoic; Petrography; Petrology; Subduction; Volcanic rocks; Whole rock; Appalachians; North America; Northern Appalachians; Pacquet Harbour Group; Thetford Mines Ophiolite
Abstract Numbers:90M/2272
Record ID:1990012263
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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