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Clinopyroxene geobarometry of pyroxenitic xenoliths from Hyblean Plateau (SE Sicily, Italy)

Paolo Nimis
Clinopyroxene geobarometry of pyroxenitic xenoliths from Hyblean Plateau (SE Sicily, Italy)
European Journal of Mineralogy (June 1998) 10 (3): 521-533

Abstract

Using density estimates for the sedimentary cover, crustal basement and mantle, and assuming that the crustal basement is essentially granitic, it is possible to estimate a maximum range of 34-55 km for the depth of magmatic segregation of coarse-grained pyroxenites. The medium-grained pyroxenites may have formed at shallower depths, in some cases perhaps as monomineralic clinopyroxenites. The most reliable P estimate (8 kbar) corresponds with a depth of approximately 28 km, matching the depth of the Moho discontinuity under this region of SE Sicily. Combination of clinopyroxene P estimates with T data based on two-pyroxene geothermometry suggests the existence of a high geothermal gradient comparable with those defined for environments dominated by advective heat-transfer mechanisms. The proposed P-T profile is consistent with petrological constraints (absence of garnet, presence of spinel) and with the palaeodynamic setting of the region.


ISSN: 0935-1221
Serial Title: European Journal of Mineralogy
Serial Volume: 10
Serial Issue: 3
Title: Clinopyroxene geobarometry of pyroxenitic xenoliths from Hyblean Plateau (SE Sicily, Italy)
Author(s): Nimis, Paolo
Affiliation: Universita di Padova, Dipartimento di Mineralogia e Petrologia, Padua, Italy
Pages: 521-533
Published: 199806
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Federal Republic of Germany
References: 54
Accession Number: 1998-046910
Categories: Igneous and metamorphic petrology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 2 tables, geol. sketch map
N36°45'00" - N37°00'00", E14°30'00" - E15°15'00"
Country of Publication: Germany
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United KingdomTwickenhamUKUnited Kingdom
Update Code: 199818
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