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Strain modulation around inclusions in an annealed natural cordierite

Gian Carlo Capitani, Jean-Claude Doukhan, Thomas Malcherek and Michael Carpenter
Strain modulation around inclusions in an annealed natural cordierite
European Journal of Mineralogy (October 2001) 13 (5): 921-928

Abstract

Among the Mediterranean lamproites, the Jumilla occurrence deserves particular interest since it contains significant amounts of carbonates and an apatite deposit. Jumillites (olivine-richterite madupitic lamproites) contain olivine (Mg# 89-93), phlogopite (Mg# 72-93), Fe-rich sanidine, spinels, K-rich richterite, clinopyroxene, fluorapatite and analcite (probably derived from leucite). Analcite can be locally very abundant (up to 40 % vol). The magmas were mostly peralkaline with high MgO (13-17 %), Cr (740-930 ppm), Ni (560-670 ppm), P205 (1.15-2.26 %), Ba, REE (Ce/Yb up to 160), Th (93-161) contents and high 87Sr/86Sr ratios (0.71378-0.71680). The rocks exhibit wide chemical variations which cannot be explained by fractional crystallization or by prograde partial melting of the same source. Carbonate-bearing assemblages are also present in the form of late crystallized aggregates in the groundmass (CARB-i) and as thin veins and infiltrates (CARB-ii) in the jumillite rocks. The carbonate assemblages and the jumillite magma are in some degree genetically related as suggested, for instance, by the Sr isotope data of the apatite.


ISSN: 0935-1221
EISSN: 1617-4011
Serial Title: European Journal of Mineralogy
Serial Volume: 13
Serial Issue: 5
Title: Strain modulation around inclusions in an annealed natural cordierite
Affiliation: Universite des Sciences et Technologies de Lille, Laboratoire Structure et Proprietes de l'Etat Solide, Villeneuve d'Ascq, France
Pages: 921-928
Published: 200110
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Federal Republic of Germany
References: 27
Accession Number: 2001-075367
Categories: Mineralogy of silicates
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 2 tables
N64°45'00" - N67°00'00", W125°00'00" - W117°30'00"
Secondary Affiliation: Universitaet Muenster, DEU, Federal Republic of GermanyUniversity of Cambridge, GBR, United Kingdom
Country of Publication: Germany
Secondary Affiliation: GeoRef, Copyright 2018, American Geosciences Institute.
Update Code: 200123
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