Spatial variability of source composition and petrogenesis in rift and rift flank alkaline lavas from the Eger Rift, Central Europe

Haase, Karsten M.; Beier, Christoph; Regelous, Marcel; Rapprich, Vladislav; Renno, Axel D.

doi:10.1016/j.chemgeo.2016.11.003

Cited by 19 publications

(14 citation statements)

References 70 publications

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“…New Sr‐Nd‐Pb‐Hf isotope data from submarine samples from Serreta Ridge and N' Serreta Ridge were processed (Sr‐Nd‐Pb‐Hf) and analyzed (Sr‐Nd‐Pb) at the GZN, FAU Erlangen‐Nürnberg. For Sr‐Nd‐Pb analysis ~150‐ to 200‐mg dried sample powder and glasses were leached in hot 6M HCl for at least 2 h and in a 1:1:2 mixture of H 2 O 2 , 2.5M HCl and Milli‐Q H 2 O, respectively, then dissolved using the method described in Haase et al (). Strontium‐Nd‐Hf were separated in ion‐exchange columns using Biorad 50W‐X8 (200–400 mesh) cationic resin with variably concentrated HCl (and HF).…”

Section: Sampling and Methodsmentioning

confidence: 99%

Progressive Changes in Magma Transport at the Active Serreta Ridge, Azores

Romer

Beier

Haase

et al. 2019

Geochem Geophys Geosyst

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Volcanism in the Eastern Azores Plateau occurs at large central volcanoes and along subaerial and submarine fissure zones, resulting from a mantle melting anomaly combined with transtensional stresses. Volcanic structures are aligned WNW‐ESE and NW‐SE, reflecting two tectonic stress fields that control the direction of lateral melt transport. Terceira Island is influenced by both stress fields, dividing the island into an eastern and western part. Several submarine volcanic ridges with variable orientations are located west of Santa Bárbara, the youngest central volcano on Terceira. Major, trace element and Sr‐Nd‐Pb‐Hf isotope compositions from submarine lavas and glasses, in part associated with the 1998–2001 Serreta Ridge eruption, vary between different lava suites, suggesting a formation from different mantle sources. Submarine lavas are more primitive than those from Santa Bárbara volcano, indicating that they are not laterally connected with the shallow magma reservoir located in 2‐ to 5‐km depth beneath the central volcano. Mineral thermobarometric data suggest that the older Serreta magmas were laterally transported at depths >5 km from Santa Bárbara predominantly in WNW direction. We propose that lithospheric extension controls magma transport from the central volcano to Serreta Ridge. The youngest Serreta lavas differ from Santa Bárbara and other submarine ridges in having less radiogenic Pb and higher Hf isotope ratios representing a new magma pulse ascending from the mantle. We conclude that lateral magma transport and the morphology of volcanic ridges are controlled by tectonic stresses in the lithosphere, whereas vertical melt transport is initiated by processes in the mantle.

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Section: Sampling and Methodsmentioning

confidence: 99%

Progressive Changes in Magma Transport at the Active Serreta Ridge, Azores

Romer

Beier

Haase

et al. 2019

Geochem Geophys Geosyst

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“…For Sr-Nd-Pb isotopes ∼150-200 mg dried sample powder were leached in hot 6M HCl for at least 2 h then dissolved (for Sr-Nd-Pb) and separated in ion-exchange columns (for Sr-Nd) using the method described in Haase et al (2017). Strontium and Nd isotopes were analyzed using a Thermo-Fischer Triton thermal ionization multicollector mass spectrometer in static mode.…”

Section: Geochemical Methodsmentioning

confidence: 99%

Correlated Changes Between Volcanic Structures and Magma Composition in the Faial Volcanic System, Azores

et al. 2018

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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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Spatial variability of source composition and petrogenesis in rift and rift flank alkaline lavas from the Eger Rift, Central Europe

Cited by 19 publications

References 70 publications

Progressive Changes in Magma Transport at the Active Serreta Ridge, Azores

Progressive Changes in Magma Transport at the Active Serreta Ridge, Azores

Correlated Changes Between Volcanic Structures and Magma Composition in the Faial Volcanic System, Azores

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

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