Origin and ascent history of unusually crystal-rich alkaline basaltic magmas from the western Pannonian Basin

Jankovics, M. Éva; Dobosi, G.; Embey-Isztin, Antal; Kiss, Balázs; Sági, Tamás; Harangi, Szabolcs; Ntaflos, Theodoros

doi:10.1007/s00445-013-0749-7

Cited by 37 publications

(30 citation statements)

References 82 publications

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“…They consist of numerous subgrains, mainly in their marginal parts. A number of clinopyroxene and amphibole megacrysts were found at L1, which have the same appearances and textural features as the well-studied clinopyroxene and amphibole megacrysts commonly found in other alkaline basaltic volcanics from the Bakony-Balaton Highland Volcanic Field (e.g., Embey-Isztin et al, 1990;Dobosi et al, 2003a;Jankovics et al, 2013Jankovics et al, , 2016. They generally occur together with pyroxenite (Type II) xenoliths consisting of clinopyroxene + olivine + spinel ± amphibole.…”

Section: Origin and Formation Of The Magmatic Environmentsmentioning

confidence: 63%

“…These compositions are characteristic of olivines from lithospheric mantle-derived peridotites (e.g., Boudier, 1991;Hirano et al, 2004). Thus, these olivine cores are inferred to be olivine xenocrysts, similar to occurrences in nearby volcanic centers (e.g., Jankovics et al, 2009Jankovics et al, , 2012Jankovics et al, , 2013.…”

Section: The Magmatic System That Fed the Initial Phreatomagmatic Expmentioning

confidence: 89%

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Olivine major and trace element compositions coupled with spinel chemistry to unravel the magmatic systems feeding monogenetic basaltic volcanoes

Jankovics

Sági

Astbury

et al. 2019

Journal of Volcanology and Geothermal Research

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Monogenetic basaltic volcanic systems, despite their considerable smaller size and shorter lifetime compared to polygenetic volcanoes, can have complex pre-eruptive histories and composite volcanic facies architectures. Their source-to-surface investigation is essential for our better understanding of monogenetic volcanism and requires high-resolution mineral-scale analyses.In this study, we focus on diversely zoned olivine crystals and their spinel inclusions from alkaline basaltic volcanics that are the result of mixing of numerous magmas, crystals and fragments of various origins. The Fekete-hegy volcanic complex is one of the largest and most composite eruptive centers in the intracontinental monogenetic Bakony-Balaton Highland Volcanic Field (western Pannonian Basin, Eastern Central Europe). It is a compound multi-vent system built up by multiple eruption episodes: initial maar-forming phreatomagmatic eruptions were followed by massive lava flows and magmatic explosive activity. We performed stratigraphically controlled sampling in order to reveal the history of the successively erupted magma batches represented by the distinct eruptive units, as well as to discover the petrogenetic processes that controlled the evolution of the magmatic system.The juvenile pyroclasts of the phreatomagmatic eruption products (unit 1) contain a remarkably diverse mineral assemblage including five different olivine types and three distinct spinel groups. In addition, they comprise various xenoliths. Based on detailed textural investigations combined with in situ electron microprobe analyses, high-resolution laser ablation ICP-MS trace element mapping and single spot measurements on the IntroductionMineral-scale studies on various volcanic rocks have long been demonstrated as being key to understanding sub-volcanic systems. As minerals respond both texturally and compositionally to changing magmatic environments, they retain abundant information concerning the history of magmatic compositions and processes in their crystal growth stratigraphy (e.g., Davidson et al., 2007;Ginibre et al., 2007;Blundy and Cashman, 2008;Streck, 2008). Thus, detailed investigation of the textures, zoning patterns and compositions of rock-forming minerals allows us to detect distinct populations and to reveal the origins of single crystals, making it a powerful tool in discovering the evolution of magmatic systems.Olivine crystals are valuable recorders of deep-seated petrogenetic processes and involved magmas. Their high-resolution textural, zoning and chemical analysis provides a particular insight into the pre-eruptive evolution of various magmatic systems (e.g.

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Section: Origin and Formation Of The Magmatic Environmentsmentioning

confidence: 63%

Section: The Magmatic System That Fed the Initial Phreatomagmatic Expmentioning

confidence: 89%

Olivine major and trace element compositions coupled with spinel chemistry to unravel the magmatic systems feeding monogenetic basaltic volcanoes

Jankovics

Sági

Astbury

et al. 2019

Journal of Volcanology and Geothermal Research

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“…The different Al IV contents in clinopyroxene in both types of gabbro suggest a difference of crystallization pressures [e.g. 24,25]. The compositional difference between cores and rims in orthopyroxenes was similar for both types of xenolith.…”

Section: Resultsmentioning

confidence: 93%

Two types of gabbroic xenoliths from rhyolite dominated Niijima volcano, northern part of Izu-Bonin arc: petrological and geochemical constraints

et al. 2017

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Abstract:We examined the petrography, petrology, and geochemistry of two types of gabbroic xenoliths (A-and Btype xenoliths) in olivine basalt and biotite rhyolite units among the dominantly rhyolitic rocks in Niijima volcano, northern Izu-Bonin volcanic arc, central Japan. A-type gabbroic xenoliths consisting of plagioclase, clinopyroxene, and orthopyroxene with an adcumulate texture were found in both olivine basalt and biotite rhyolite units, and B-type gabbroic xenoliths consisting of plagioclase and amphibole with an orthocumulate texture were found only in biotite rhyolite units. Geothermal-and barometricmodelling based on mineral chemistry indicated that the A-type gabbro formed at higher temperatures (899-955 ∘ C) and pressures (3.6-5.9 kbar) than the B-type gabbro (687-824 ∘ C and 0.8-3.6 kbar). These findings and whole-rock chemistry suggest different parental magmas for the two types of gabbro. The A-type gabbro was likely formed from basaltic magma, whereas the B-type gabbro was likely formed from an intermediate (andesitic) magma. The gabbroic xenoliths in erupted products at Niijima volcano indicate the presence of mafic to intermediate cumulate bodies of different origins at relatively shallower levels beneath the dominantly rhyolitic volcano.

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“…Ultramafic rocks comprising olivine with compositions <Fo 90 , >0.1 wt.% CaO and <0.3 NiO are generally interpreted to be related to fractional crystallisation of primitive magmas and of not mantle origin (e.g. Stormer, 1973;Pearson et , 2003;Jankovics et al, 2013;Larrea et al, 2014). The composition of the olivine in the studied cumulates of Fo 75-73 , ~0.1 wt.% CaO and up to 817 ppm Ni therefore suggests a cumulate origin related to fractional crystallisation of a primitive melt.…”

Section: Evolution Of Cumulatesmentioning

confidence: 83%

Origin of mafic and ultramafic cumulates from the Ditrău Alkaline Massif, Romania

Pál-Molnár

Batki

Almási

et al. 2015

Lithos

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Mafic-ultramafic cumulates enclosed in gabbroic-dioritic rocks form part of the Mesozoic Ditrău Alkaline Massif in the Eastern Carpathians, Romania. The poikilitic olivine-and pyroxene-rich and nearly mono mineralic hornblendite rocks display typical cumulate textures with early crystallised olivine ), diopside and augite. In the early stages of their genesis the amphibole was intercumulus while in later stages it acquired cumulus status as the fractionating magma evolved. Using major and trace element compositions of minerals and whole-rock samples the origin of these cumulates is determined and the parental magma composition and depth of emplacement are calculated.Cumulus clinopyroxene has more primitive composition than intercumulus amphibole suggesting closed system fractionation for the evolution of poikilitic olivine-and pyroxenerich cumulates. The evolution of the amphibole-rich mesocumulates is more clearly the result of closed system crystallisation dominated by the precipitation of clinopyroxene and amphibole cumulus crystals.Lamprophyre dykes of the Ditrău Alkaline Massif are proposed to reflect multiple basanitic parental magma batches from which the cumulus olivine and clinopyroxene crystallised. A C C E P T E D M A N U S C R I P T ACCEPTED MANUSCRIPT2 Relative to these dykes the calculated equilibrium melts for intercumulus amphibole in the cumulates was more primitive whilst that for the cumulus amphibole was more evolved. The calculated crystallisation temperature and pressure of ~1000-1050 °C and ~0.7 GPa, based on the composition of the amphiboles, indicate crystallisation at lower crustal depths. Rare earth element compositions are consistent with an intra-plate tectonic setting.

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Origin and ascent history of unusually crystal-rich alkaline basaltic magmas from the western Pannonian Basin

Cited by 37 publications

References 82 publications

Olivine major and trace element compositions coupled with spinel chemistry to unravel the magmatic systems feeding monogenetic basaltic volcanoes

Olivine major and trace element compositions coupled with spinel chemistry to unravel the magmatic systems feeding monogenetic basaltic volcanoes

Two types of gabbroic xenoliths from rhyolite dominated Niijima volcano, northern part of Izu-Bonin arc: petrological and geochemical constraints

Origin of mafic and ultramafic cumulates from the Ditrău Alkaline Massif, Romania

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