Volcanology, geochemistry and age of the Lausitz Volcanic Field

Büchner, Jörg; Tietz, Olaf; Viereck, Lothar; Suhr, Peter; Abratis, Michael

doi:10.1007/s00531-015-1165-3

Cited by 28 publications

(26 citation statements)

References 33 publications

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“…Most of the magmatism was concentrated along the Eger Rift, which represents the easternmost branch of the European Cenozoic Rift System (e.g., Dèzes et al 2004;Rajchl et al 2008). Apart from the main volcanic complexes (see e.g., Ulrych et al 2002;Rapprich and Holub 2008;Cajz et al 2009;Holub et al 2010;Skála et al 2014;Ackerman et al 2015), several volcanic fields were formed also on the shoulders of the rift (Awdankiewicz 2005;Rapprich et al 2007;Büchner and Tietz 2012;Valenta et al 2014;Büchner et al 2015;Petronis et al 2015;Tietz and Büchner 2015;Awdankiewicz et al 2016;Ulrych et al 2016;Haase et al 2017). Our study focused on the Zebín Volcano, located in the Jičín Volcanic Field (Rapprich et al, 2007;Petronis et al 2015; Fig.…”

Section: Jičín Volcanic Fieldmentioning

confidence: 99%

Fingerprints of magma mingling processes within the Miocene Zebín tuff cone feeding system (Jičín Volcanic Field, Czech Republic)

Rapprich¹,

Shields²,

Halodová³

et al. 2018

J. Geosci.

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A well-preserved set of partly eroded mid-Miocene scoria cones and tuff cones are exposed in the Jičín Volcanic Field, Czech Republic. Zebín Hill, a formerly quarried tuff cone with an exposed conduit and associated dikes, offers an opportunity to study magmatic processes within the high-level feeding system of a small monogenetic volcano. Two types of dikes and associated "blob-like" intrusions were observed. Pure basanite dikes predominate in the center of the cone, whereas its peripheries were intruded by mingled dikes. The mingled dikes consist of mm-scale basanitic domains enclosed in a network of trachyandesitic dikelets. Locally, hybrid domains with intermediate characteristics were observed. The basanite dikes and basanite enclaves within mingled dikes contain normally-zoned minerals (Fo 90 to Fo 70 olivine, Mg-rich to Mg-poor diopside, labradorite to andesine composition of plagioclase) indicative of basanite magma evolution during ascent. In contrast, the trachyandesite and hybrid enclaves in mingled dikes show reverse zoning of minerals (Mg-poor to Mg-rich diopside, sanidine to oligoclase feldspar composition) indicative of magma hybridization. This study suggests that the Zebín Volcano did not develop from a simple monogenetic system and through a single central axis feeder; rather, Zebín Hill evolved from a complex magma feeding/storage system and through a complex feeder network. We conclude that the simple external structure of a monogenetic volcano may sometimes hide rather complex magmatic plumbing systems encompassing compositionally contrasting rocks/magmas.

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Section: Jičín Volcanic Fieldmentioning

confidence: 99%

Fingerprints of magma mingling processes within the Miocene Zebín tuff cone feeding system (Jičín Volcanic Field, Czech Republic)

Rapprich¹,

Shields²,

Halodová³

et al. 2018

J. Geosci.

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“…1). The outcrop is situated within the Lausitz (Lusatia) Volcanic Field in the CEVP (Büchner et al 2015). The Lausitz Volcanic Field is located on various geological units (Kozdrój et al 2001;Büchner et al 2015).…”

Section: Geological Setting and Host Rock Characteristicsmentioning

confidence: 99%

“…The outcrop is situated within the Lausitz (Lusatia) Volcanic Field in the CEVP (Büchner et al 2015). The Lausitz Volcanic Field is located on various geological units (Kozdrój et al 2001;Büchner et al 2015). Its northernmost and northeastern parts overlap Paleozoic anchimetamorphic sediments of the Kaczawa and Görlitz Synclinoriums and more to the south Cadomian granitoids and greywackes.…”

Section: Geological Setting and Host Rock Characteristicsmentioning

confidence: 99%

“…The eruption centre was probably situated on the north-eastern edge of the quarry. The basanitic lavas probably ponded within the crater and formed a lava lake, which fed lava flows (Büchner et al 2015). The lava reaches a thickness of up to 20 m. At the contact between lava and the underlying granodiorite, blocky peperitic structures were formed (Tietz et al 2013).…”

Section: Geological Setting and Host Rock Characteristicsmentioning

confidence: 99%

“…It has microlitic structure with olivine and augite phenocysts and plagioclase-and clinopyroxene-laths as microliths, embedded in the nepheline+opaques groundmass. Chemical analyses (Büchner et al 2015) reveal contamination of the lava by xenoliths, indicated in decreasing MgO, Cr and Ni contents from proximal (13.1 wt.% MgO) to distal (10.2 wt.% MgO) parts of the lava flow. The xenolith-rich lava contains 42.2 -42.3 wt.…”

Section: Geological Setting and Host Rock Characteristicsmentioning

confidence: 99%

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Depleted subcontinental lithospheric mantle and its tholeiitic melt metasomatism beneath NE termination of the Eger Rift (Europe): the case study of the Steinberg (Upper Lusatia, SE Germany) xenoliths

et al. 2015

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The ca. 30 Ma Steinberg basanite occurs at the NE termination of the Eger (Ohře) Rift in the NW Bohemian Massif, Central Europe, and belongs to the Cenozoic alkaline Central European Volcanic Province. The basanite hosts a suite of mantle xenoliths, most of which are harzburgites containing relatively magnesian olivine (Fo 90.5-91.6) and Alpoor (0.04-0.13 a pfu) orthopyroxene (mg# 0.90-0.92). Some of these harzburgites also contain volumetrically minor clinopyroxene (mg# 0.92-0.95, Al 0.03-0.13 a pfu) and have U-shaped LREE-enriched REE patterns. The Steinberg harzburgites are typical for the Lower Silesian -Upper Lusatian domain of the European subcontinental lithospheric mantle. They represent residual mantle that has undergone extensive partial melting and was subsequently affected by mantle metasomatism by mixed carbonatite-silicate melts. The Steinberg xenolith suite comprises also dunitic xenoliths affected by metasomatism by melt similar to the host basanite, which lowered the Fo content in olivine to 87.6 %. This metasomatism happened shortly before xenolith entrainment in the erupting lava. One of the xenoliths is a wehrlite (olivine Fo 73 %, clinopyroxene mg# 0.83-0.85, subordinate orthopyroxene mg# 0.76-0.77). Its clinopyroxene REE pattern is flat and slightly LREE-depleted. This wehrlite is considered to be a tholeiitic cumulate. One of the studied harzburgites contains clinopyroxene with similar trace element contents to those in wehrlite. This type of clinopyroxene records percolation of tholeiitic melt through harzburgite. The tholeiitic melt might be similar to Cenozoic continental tholeiites occurring in the Central European Volcanic Province (e.g., Vogelsberg, Germany).

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Neogene and Quaternary dikes and related joints as conduits for recent juvenile degassing: case studies from the seismically active region of NW-Bohemia, Czech Republic

et al. 2023

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The contemporary occurrence of juvenile gas emissions at springs or mofettes in active volcanic areas can be observed worldwide. This correlation is less frequent in areas with dormant or post-volcanic activity. The NW-Bohemia/Vogtland region located at the Eger rift zone (Czech Republic) provides an intriguing example of this correlation between numerous Neogene-aged post-volcanism locations and juvenile fluid emission sites. Newly discovered dikes and diatremes are located close to vents with the highest helium isotope ratios (3He/4He) of about 6 Ra. Our results lend support to the hypothesis that feeder dikes and their fractured wall rocks should be considered the predominant conduits for the continuous upwelling of juvenile fluids. Moreover, 77% of the CO2 gas emission sites are located close to dikes or diatremes, i.e., within a distance of 4 km. Our studies reveal a spatial dependence of the Ra values at the spring sites with the estimated distances to the basaltic bodies. The results confirm the negative trend known from the literature. That is, Ra values decrease with increasing distance from the feeder dikes.

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Volcanology, geochemistry and age of the Lausitz Volcanic Field

Cited by 28 publications

References 33 publications

Fingerprints of magma mingling processes within the Miocene Zebín tuff cone feeding system (Jičín Volcanic Field, Czech Republic)

Fingerprints of magma mingling processes within the Miocene Zebín tuff cone feeding system (Jičín Volcanic Field, Czech Republic)

Depleted subcontinental lithospheric mantle and its tholeiitic melt metasomatism beneath NE termination of the Eger Rift (Europe): the case study of the Steinberg (Upper Lusatia, SE Germany) xenoliths

Neogene and Quaternary dikes and related joints as conduits for recent juvenile degassing: case studies from the seismically active region of NW-Bohemia, Czech Republic

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