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Cooling history of a dyke on Alicudi (Aeolian Islands) from intracrystalline Fe (super 2+) -Mg exchange reaction in clinopyroxene

Carlo Malgarotto, Gianmario Molin and Pier Francesco Zanazzi
Cooling history of a dyke on Alicudi (Aeolian Islands) from intracrystalline Fe (super 2+) -Mg exchange reaction in clinopyroxene
European Journal of Mineralogy (August 1993) 5 (4): 755-762

Abstract

EPMA values for phenocrysts (pyroxenes, olivine and plagioclase) in seven rock samples across a 2.8 m thick andesitic dyke, together with XRF rock analyses, show samples at the chilled margins that are sharply distinct in their high Mg, Cr and Ni contents. Differences in Mg-Fe (super 2+) ordering in the M1 and M2 sites of clinopyroxene are observed across the dyke traverse. The equilibration T, evaluated by the method of Molin & Zanazzi, was 850 degrees C at the dyke margins and 630 degrees C near the centre. The cooling rates were calculated to be from 8 to 34 degrees C/h near the boundaries to 1 degrees C/h in the middle.


ISSN: 0935-1221
Serial Title: European Journal of Mineralogy
Serial Volume: 5
Serial Issue: 4
Title: Cooling history of a dyke on Alicudi (Aeolian Islands) from intracrystalline Fe (super 2+) -Mg exchange reaction in clinopyroxene
Affiliation: Universita di Perugia, Dipartimento di Scienze della Terra, Perugia, Italy
Pages: 755-762
Published: 199308
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Federal Republic of Germany
References: 13
Accession Number: 1993-023692
Categories: Igneous and metamorphic petrology
Document Type: Serial
Bibliographic Level: Analytic
Annotation: Includes appendix
Illustration Description: illus. incl. 2 tables, geol. sketch map
N38°19'60" - N38°49'60", E14°19'60" - E15°19'60"
Secondary Affiliation: Universita di Padova, ITA, Italy
Country of Publication: Germany
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United KingdomTwickenhamUKUnited Kingdom
Update Code: 1993
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