Oxygen isotope constraints on the petrogenesis of volcanic arc magmas from Martinique, Lesser Antilles

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doi: 10.1016/0012-821X(89)90101-5
Authors:Davidson, Jon P.; Harmon, Russell S.
Author Affiliations:Primary:
South. Methodist Univ., Dep. Geol. Sci., Dallas, TX, United States
Volume Title:Earth and Planetary Science Letters
Source:Earth and Planetary Science Letters, 95(3-4), p.255-270. Publisher: Elsevier, Amsterdam, Netherlands. ISSN: 0012-821X
Publication Date:1989
Note:In English. 52 refs.; illus. incl. 1 table, geol. sketch maps
Summary:Volcanic rocks from Martinique are very diverse isotopically. Correlations between delta18O and radiogenic isotopes show that modification of isotopic compositions occurred during magmatic differentiation rather than at source. A two-stage model for the origin and differentiation of the magmas is proposed. Primary basaltic melts are generated from the subduction-modified asthenospheric mantle wedge. These magmas ascend into the arc crust and differentiate. On Martinique, crystal fractionation is accompanied by contamination with isotopically distinct crust, including a component of terrigenous sediments. Thus, subduction- zone processes at the Lesser Antilles and other island arcs are similar, involving only a small volumetric contribution from subducted sediment. [R.E.S.]
Subjects:Differentiation; Genesis; Geochemistry; Igneous rocks; Island arcs; Isotopes; Magmas; O-18/O-16; Oxygen; Pollution; Stable isotopes; Subduction zones; Volcanic rocks; Volcanism; Volcanology; Antilles; Caribbean region; Lesser Antilles; Martinique; West Indies
Abstract Numbers:90M/3153
Record ID:1990013811
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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