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Mafic and salic igneous xenoliths in late Tertiary alkaline basalts; fluid inclusion and mineralogical evidence for a deep-crustal magmatic reservoir in the Western Carpathians

Monika Huraiova, Patrik Konecny, Vlastimil Konecny, Klaus Simon and Vratislav Hurai
Mafic and salic igneous xenoliths in late Tertiary alkaline basalts; fluid inclusion and mineralogical evidence for a deep-crustal magmatic reservoir in the Western Carpathians (in Fluid inclusions, Carlos Ayora (prefacer))
European Journal of Mineralogy (October 1996) 8 (5): 901-916

Abstract

Explosive late Tertiary alkaline basalts on the N margin of the Pannonian Basin ejected pyroxenite, hornblendite, anorthoclasite and quartz-bearing tonalite-trondhjemite xenoliths. One tonalite sample contains primary CO (sub 2) -H (sub 2) O inclusions with up to 20 vol.% aqueous phase; the remaining xenoliths trapped CO (sub 2) inclusions without detectable H (sub 2) O. Additional, as yet undetected volatiles are responsible for depression of the CO (sub 2) final melting T, which clustered around -58 degrees C in all rock types. Maximum densities of the CO (sub 2) inclusions tend to decrease from pyroxenites (0.92 g/cm (super 3) ), through anorthoclasites (0.89 g/cm (super 3) ), to tonalites (0.85 g/cm (super 3) ) and hornblendites (0.75-0.87 g/cm (super 3) ), reflecting decreasing depth of formation. Equilibration P-T conditions for clinopyroxenes ranged between 1220 degrees C at 10 kbar and 1068 degrees C at 4.3 kbar, with 50% of the estimates giving 6.5-7.5 kbar. Post-cumulus hornblende, coexisting with An (sub 53-64) plagioclase, crystallized at 928-1074 degrees C. Most of the P-T data for pyroxenites indicate depths of 23-26 km, close to recent Moho discontinuity (27-29 km), while those for tonalites and hornblendites reflect their middle crustal emplacement (15-20 km). Cumulate textures and essentially CO (sub 2) -dominated primary inclusions suggest formation of the xenoliths by fractional crystallization in a large reservoir of mantle-derived basaltic magmas.


ISSN: 0935-1221
Serial Title: European Journal of Mineralogy
Serial Volume: 8
Serial Issue: 5
Title: Mafic and salic igneous xenoliths in late Tertiary alkaline basalts; fluid inclusion and mineralogical evidence for a deep-crustal magmatic reservoir in the Western Carpathians
Title: Fluid inclusions
Affiliation: Comenius University, Department of Mineralogy and Petrology, Bratislava, Slovakia
Pages: 901-916
Published: 199610
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Federal Republic of Germany
Meeting name: ECROFI XIII symposium on Fluid inclusions
Meeting location: Sitges, ESP, Spain
Meeting date: 19950621June 21-23, 1995
References: 26
Accession Number: 1997-006609
Categories: Igneous and metamorphic petrology
Document Type: Serial Conference document
Bibliographic Level: Analytic
Illustration Description: 5 tables
N46°00'00" - N49°49'60", E18°00'00" - E28°00'00"
Secondary Affiliation: Geological Survey, SVK, SlovakiaGeochemisches Institut, DEU, Federal Republic of Germany
Country of Publication: Germany
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United KingdomTwickenhamUKUnited Kingdom
Update Code: 199702
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