The Open UniversitySkip to content
 

Peridotite xenoliths from Grenada, Lesser Antilles Island Arc

Parkinson, I.J.; Arculus, R.J. and Eggins, S.M. (2003). Peridotite xenoliths from Grenada, Lesser Antilles Island Arc. Contributions to Mineralogy and Petrology, 146(2) pp. 241–262.

DOI (Digital Object Identifier) Link: http://dx.doi.org/10.1007/s00410-003-0500-z
Google Scholar: Look up in Google Scholar

Abstract

Ultramafic xenoliths comprising harzburgite, lherzolite (reacted harzburgite) and spinel-rich dunite, occur in alkali olivine basalts (M series) of Grenada in the Lesser Antilles island arc. Textures are protogranular, porphyroclastic and granular; the latter are restricted to dunites and areas of the harzburgites/lherzolites where interaction with host magma has occurred. Primary mineralogy comprises olivine, orthopyroxene, clinopyroxene, and spinel. Harzburgites are residual from a fractional partial melting event totaling ~22%. Infiltration of harzburgite by (and reaction with) basalt has produced: a wehrlite, with partial dissolution of primary spinel, an increase in the oxygen fugacity (ƒO2) from primary values 1–2 log ƒO2 units above the fayalite-magnetite-quartz (FMQ) buffer, to 2–2.5 log units above the buffer; reaction of orthopyroxene to form patches of intergrown olivine and clinopyroxene, and bronzite andesite glass (60 wt%, SiO2 18–20 wt% Al2O3 and 3–4 wt% Na2O) with flat to light rare earth element-depleted, chondrite-normalized abundances. Refertilisation of the mantle by reacting melts, producing a clinopyroxene-rich lithology, may form a source of ankaramitic (high-Ca) arc basalts.

Item Type: Journal Article
ISSN: 1432-0967
Extra Information: Some of the symbols may not have transferred correctly into this bibliographic record and/or abstract.
Academic Unit/Department: Science > Environment, Earth and Ecosystems
Interdisciplinary Research Centre: Centre for Earth, Planetary, Space and Astronomical Research (CEPSAR)
Item ID: 6292
Depositing User: Users 2315 not found.
Date Deposited: 24 Jan 2007
Last Modified: 02 Dec 2010 19:56
URI: http://oro.open.ac.uk/id/eprint/6292
Share this page:

Altmetrics

Scopus Citations

Actions (login may be required)

View Item
Report issue / request change

Policies | Disclaimer

© The Open University   + 44 (0)870 333 4340   general-enquiries@open.ac.uk