Rhyolites from the Roztoky Intrusive Centre, České středohoří Mts. Xenoliths or dyke differentiates?

J. Ulrych, E. Pivec, A. Höhndorf, K. Balogh, J. Bendl, J. Rutěk

Research output: Contribution to journalArticle

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Abstract

Dykes or xenoliths of rhyolite were found recently within a bostonite dyke in a borehole at Malé Březno. They represent the first occurrence of the quartz-beating volcanic rock in the České středohoří Mts. Geochemical and isotope data at the time of intrusion (87Sr/86Sr = 0.70822, 143Nd/144Nd = 0.512259, εtNd = -6.3) of the rhyolites reflect substantial crustal contamination of the magma in comparison with data on spatially associated camptonites (0.704054-.70433; 0.512627, ε1Nd = +0.6), gauteites (0.70446; 0.512735, εtNd = +2.5), monzodiorites (0.70431-0.70439; 0.512703, ε1Nd = +2.0) or phonolite (0,70416; 0.512752, εtNd = +2.9). Unusual rhyolite dykes or xenoliths were generated either by AFC process or by partial melting and transformation of an older felsic rock - possibly originating from the Saxothuringian basement. The rhyolites occur in a spatial association with the Roztoky Intrusive Centre (RIC). The centre is formed by a crater vent filled by trachytic breccia and hypabyssal intrusions, together with more than 1000 almost radial arranged dykes. Weakly alkaline hypabyssal rock series of essexite - monzodiorite - sodalite syenite (D.I. = 46-64) and linked coexisting dykes of weakly alkaline series (D.I = 39-81) (trachybasalt) - gauteite/ camptonite - bostonite/sodalite syenite porphyry - (trachyte) - (rhyolite?) and strongly alkaline series (D.I. = 39-87) (tephrite/basanite) - camptonite/monchiquite - tephriphonolite - phonolite/ tinguaite/nepheline syenite porphyry were recognized. Geochemical characteristics of differentiation suite of the RIC prove its origin by fractional crystallization of mantle derived magma. Layering and almost single-step emptying of magma chamber is a presupposed mechanism of its genesis. The 87Sr/86Sr ratios of the RIC rock suite, calculated back to the time of intrusion, yielding values ranging from 0.70363 (hornblendite cumulate) to 0.70446 (gauteite) confirm its primary mantle origin without significant crustal contamination.

Original languageEnglish
Pages (from-to)327-352
Number of pages26
JournalChemie der Erde - Geochemistry
Volume60
Issue number4
Publication statusPublished - 2000

Fingerprint

syenite
rhyolite
sodalite
phonolite
dike
crustal contamination
Rocks
intrusion
rocks
magma
porphyry
tinguaite
Contamination
hypabyssal rock
mantle
nepheline syenite
Volcanic rocks
basanite
trachyte
Earth mantle

ASJC Scopus subject areas

  • Geochemistry and Petrology
  • Geophysics

Cite this

Rhyolites from the Roztoky Intrusive Centre, České středohoří Mts. Xenoliths or dyke differentiates? / Ulrych, J.; Pivec, E.; Höhndorf, A.; Balogh, K.; Bendl, J.; Rutěk, J.

In: Chemie der Erde - Geochemistry, Vol. 60, No. 4, 2000, p. 327-352.

Research output: Contribution to journalArticle

Ulrych, J. ; Pivec, E. ; Höhndorf, A. ; Balogh, K. ; Bendl, J. ; Rutěk, J. / Rhyolites from the Roztoky Intrusive Centre, České středohoří Mts. Xenoliths or dyke differentiates?. In: Chemie der Erde - Geochemistry. 2000 ; Vol. 60, No. 4. pp. 327-352.
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abstract = "Dykes or xenoliths of rhyolite were found recently within a bostonite dyke in a borehole at Mal{\'e} Březno. They represent the first occurrence of the quartz-beating volcanic rock in the Česk{\'e} středohoř{\'i} Mts. Geochemical and isotope data at the time of intrusion (87Sr/86Sr = 0.70822, 143Nd/144Nd = 0.512259, εtNd = -6.3) of the rhyolites reflect substantial crustal contamination of the magma in comparison with data on spatially associated camptonites (0.704054-.70433; 0.512627, ε1Nd = +0.6), gauteites (0.70446; 0.512735, εtNd = +2.5), monzodiorites (0.70431-0.70439; 0.512703, ε1Nd = +2.0) or phonolite (0,70416; 0.512752, εtNd = +2.9). Unusual rhyolite dykes or xenoliths were generated either by AFC process or by partial melting and transformation of an older felsic rock - possibly originating from the Saxothuringian basement. The rhyolites occur in a spatial association with the Roztoky Intrusive Centre (RIC). The centre is formed by a crater vent filled by trachytic breccia and hypabyssal intrusions, together with more than 1000 almost radial arranged dykes. Weakly alkaline hypabyssal rock series of essexite - monzodiorite - sodalite syenite (D.I. = 46-64) and linked coexisting dykes of weakly alkaline series (D.I = 39-81) (trachybasalt) - gauteite/ camptonite - bostonite/sodalite syenite porphyry - (trachyte) - (rhyolite?) and strongly alkaline series (D.I. = 39-87) (tephrite/basanite) - camptonite/monchiquite - tephriphonolite - phonolite/ tinguaite/nepheline syenite porphyry were recognized. Geochemical characteristics of differentiation suite of the RIC prove its origin by fractional crystallization of mantle derived magma. Layering and almost single-step emptying of magma chamber is a presupposed mechanism of its genesis. The 87Sr/86Sr ratios of the RIC rock suite, calculated back to the time of intrusion, yielding values ranging from 0.70363 (hornblendite cumulate) to 0.70446 (gauteite) confirm its primary mantle origin without significant crustal contamination.",
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N2 - Dykes or xenoliths of rhyolite were found recently within a bostonite dyke in a borehole at Malé Březno. They represent the first occurrence of the quartz-beating volcanic rock in the České středohoří Mts. Geochemical and isotope data at the time of intrusion (87Sr/86Sr = 0.70822, 143Nd/144Nd = 0.512259, εtNd = -6.3) of the rhyolites reflect substantial crustal contamination of the magma in comparison with data on spatially associated camptonites (0.704054-.70433; 0.512627, ε1Nd = +0.6), gauteites (0.70446; 0.512735, εtNd = +2.5), monzodiorites (0.70431-0.70439; 0.512703, ε1Nd = +2.0) or phonolite (0,70416; 0.512752, εtNd = +2.9). Unusual rhyolite dykes or xenoliths were generated either by AFC process or by partial melting and transformation of an older felsic rock - possibly originating from the Saxothuringian basement. The rhyolites occur in a spatial association with the Roztoky Intrusive Centre (RIC). The centre is formed by a crater vent filled by trachytic breccia and hypabyssal intrusions, together with more than 1000 almost radial arranged dykes. Weakly alkaline hypabyssal rock series of essexite - monzodiorite - sodalite syenite (D.I. = 46-64) and linked coexisting dykes of weakly alkaline series (D.I = 39-81) (trachybasalt) - gauteite/ camptonite - bostonite/sodalite syenite porphyry - (trachyte) - (rhyolite?) and strongly alkaline series (D.I. = 39-87) (tephrite/basanite) - camptonite/monchiquite - tephriphonolite - phonolite/ tinguaite/nepheline syenite porphyry were recognized. Geochemical characteristics of differentiation suite of the RIC prove its origin by fractional crystallization of mantle derived magma. Layering and almost single-step emptying of magma chamber is a presupposed mechanism of its genesis. The 87Sr/86Sr ratios of the RIC rock suite, calculated back to the time of intrusion, yielding values ranging from 0.70363 (hornblendite cumulate) to 0.70446 (gauteite) confirm its primary mantle origin without significant crustal contamination.

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