Magmagenesis in a subduction-related post-collisional volcanic arc segment: the Ukrainian Carpathians

Seghedi, Ioan; Downes, Hilary; Pécskay, Zoltán; Thirlwall, M. F.; Szakács, Alexandru; Prychodko, Michail; Mattey, D. P.

doi:10.1016/s0024-4937(01)00042-1

Cited by 76 publications

(58 citation statements)

References 36 publications

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“…Figure 3 also includes four Neogene subduction-related calc-alkaline basalts (CAB) from the CPR. Salters et al, 1988;Embey-Isztin et al, 1993;Dobosi et al, 1995;Downes et al, 1995a;Harangi et al, 1995;Dobosi & Jenner, 1999;Downes et al, 1995b;Mason et al, 1996;Seghedi et al, 2001a. Abreviations: B = Burgenland; LHP = Little Hungarian Plain; CSV = Central Slovakian Volcanic area; N-N = Nograd-Novohrad.…”

Section: Summary Of Major Trace Element and Ree Datamentioning

confidence: 99%

“…Calc-alkaline basalts (CAB) from the CPR. : 134t (9.4 Ma) Ma from north-east Hungary (Downes et al, 1995b), UA34 (~13 Ma) from the Ukrainian Carpathians (Beregovo area) (Seghedi et al 2001a;Pécskay et al, 2000), C64 (~8 Ma) from the East Carpathians (Călimani mountains) (Mason et al, 1996;Pécskay et al, 1995), Lgf (2.14 Ma) from the Perşani mountains (Downes et al, 1995a).…”

Section: Summary Of Major Trace Element and Ree Datamentioning

confidence: 99%

“…The diversity mainly resulted from the previous introduction of subduction components, mainly Ba and Pb, which are soluble in aqueous slab-derived fluids (Szabo et al, 1992;Downes et al, 1995b;Mason et al, 1996;Seghedi et al, 2001a) (Fig. 4).…”

Section: Subduction-modified Mantlementioning

confidence: 99%

“…However, in the CPR, the alkalic magmatism generally followed post-collisional calc-alkaline magmatism that was related to earlier subduction. Therefore, we also include data for the most primitive subduction-related basic rocks from the CPR (Downes et al, 1995b;Mason et al, 1996;Seghedi et al, 2001a) in order to evaluate the role of subduction-affected sources in the asthenosphere. These will be referred to as the calc-alkaline basalts (CAB).…”

Section: Introductionmentioning

confidence: 99%

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Post-collisional Tertiary–Quaternary mafic alkalic magmatism in the Carpathian–Pannonian region: a review

Seghedi¹,

et al. 2004

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Mafic alkalic volcanism was widespread in the Carpathian Pannonian region (CPR) between 11 and 0.2 Ma. It followed the Miocene continental collision of the Alcapa and Tisia blocks with the European plate, as subduction-related calc-alkaline magmatism was waning. Several groups of mafic alkalic rocks from different regions within the CPR have been distinguished on the basis of ages and/or trace-element compositions. Their trace element and Sr-Nd-Pb isotope systematics are consistent with derivation from complex mantle source regions, which included both depleted asthenosphere and metasomatized lithosphere. The mixing of DMM-HIMU-EMII mantle components within asthenosphere-derived magmas indicates variable contamination of the shallow asthenosphere and/or thermal boundary layer of the lithosphere by a HIMU-like component prior to and following the introduction of subduction components.Various mantle sources have been identified: Lower lithospheric mantle modified by several ancient asthenospheric enrichments (source A); Young asthenospheric plumes with OIB-like trace element signatures that are either isotopically enriched (source B) or variably depleted (source C); Old upper asthenosphere heterogeneously contaminated by DM-HIMU-EMII-EMI components and slightly influenced by Miocene subduction-related enrichment (source D); Old upper asthenosphere heterogeneously contaminated by DM-HIMU-EMII components and significantly influenced by Miocene subduction-related enrichment (source E). Melt generation was initiated either by: (i) finger-like young asthenospheric plumes rising to and heating up the base of the lithosphere (below the Alcapa block), or (ii) decompressional melting of old asthenosphere upwelling to replace any lower lithosphere or heating and melting former subducted slabs (the Tisia block).

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Section: Summary Of Major Trace Element and Ree Datamentioning

confidence: 99%

Section: Summary Of Major Trace Element and Ree Datamentioning

confidence: 99%

Section: Subduction-modified Mantlementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Post-collisional Tertiary–Quaternary mafic alkalic magmatism in the Carpathian–Pannonian region: a review

Seghedi¹,

et al. 2004

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“…15a, b, in comparison with existing whole rock analysis (Kovacs 2002) and UA34, the most primitive basalt in the nearby area considered to be of lithospheric mantle origin (Seghedi et al 2001). With exception of K and U, which are enriched in melt inclusions, all other incompatible elements are either equal or strongly depleted compared to the whole rock and different from the basalt.…”

Section: Melt and Crystal Inclusion Studymentioning

confidence: 76%

Origin of the Laleaua Albă dacite (Baia Sprie volcanic area and Au-Pb-Zn ore district, Romania): evidence from study of melt inclusions

Наумов¹,

Коваленкер²,

Damian³

et al. 2014

Central European Geology

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Crystal inclusions (plagioclase, biotite, magnetite) and melt inclusions were studied in minerals of the Laleaua Albà dacite (Baia Sprie, Romania). Electron microprobe analysis of 29 melt inclusions in the plagioclase, K-feldspar, and quartz confirm that crystallization of these minerals took place from typical silicic melts enriched in potassium relative to sodium (K 2 O/Na 2 O = 1.5). The sum of the petrogenic components is 92-99 wt%. This points to a possible change in water content from 8 to 1 wt% during crystallization of phenocrysts. According to ion microprobe analysis of 11 melt inclusions, the minimum water content is 0.5 wt%, and the maximum water content is 6.1 wt%. The presence of high-density water fluid segregation in one of the melt inclusions suggests that the primary water content in the melt could reach 8.4 wt%. Ion microprobe data revealed a high concentration of Cu (up to 1260 ppm) as well as higher U content (from 5.0 to 14.3 ppm; average 11.5 ppm) in some melt inclusions as compared to the average U contents in silicic melts (2.7 ppm in island-arc settings and 7.9 ppm in continental rift settings). Chondrite-normalized trace-element patterns in melt inclusions suggest a complex genesis of the studied magmatic melts. Contents of some elements (for instance Sr and Ba) are close to those in island-arc melts, while others (for instance Th, U, and Eu) resemble those in melts of continental settings.

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Origin of the absarokite–banakite association of the Damavand volcano (Iran): trace elements and Sr, Nd, Pb isotope constraints

Liotard

Dautria

Bosch

et al. 2007

Int J Earth Sci (Geol Rundsch)

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The activity of the Damavand volcano (Central Alborz, northern Iran) began 1.8 Ma ago and continued up to 7 ka BP. Although the volcanic suite is clearly of shoshonitic affinity, only two petrographic types can be distinguished in the studied lavas: (1) weakly differentiated absarokites (49 < %SiO 2 < 51), scattered around the volcano but with a regional extension, (2) highly differentiated banakites (59 < %SiO 2 < 63), which form the bulk of the 4,000 m thick volcanic pile. All lavas are alkalic (3.7 < %K 2 O < 5), REE and LILE-rich (e.g., 85 < La < 148 ppm; 9 < Th < 32 ppm) and show highly fractionated REE patterns (69 < La/Yb < 115) and pronounced Nb-Ta negative anomalies. The absarokites are characterised by Sr (0.7045-0.7046) and Nd (0.51266-0.51269) isotope compositions close to the Bulk Earth values, and distinct from those of the banakites (0.7047 < 87 Sr/ 86 Sr < 0.7049, 0.51258 < 143 Nd/ 144 Nd < 0.51262). The Pb isotope ratios are also slightly lower in the absarokites than in the banakites (18.71 < 206 Pb/ 204 Pb < 18.77, 15.62 < 207 Pb/ 204 Pb < 15.63, 38.85 < 208 Pb/ 204 Pb < 38.91, and 18.77 < 206 Pb/ 204 Pb < 18.84, 15.62 < 207 Pb/ 204 Pb < 15.64, 38.94 < 208 Pb/ 204 Pb < 39.06, respectively).Overall, there is a clear tendency towards higher Sr, Pb and lower Nd isotope ratios with increasing degree of differentiation. This study suggests that the absarokites result from a low degree of partial melting (~5%) of a highly metasomatized mantle source, which inherited its characteristics from an old subduction setting. The initiation of volcanic activity 1.8 Ma ago results from variations in the lithospheric thermal regime, probably related to lithospheric delamination as proposed for Anatolia (Pearce et al. 1990). The banakites are mainly generated by extensive fractional crystallisation (~70%) of the absarokitic magma, with a limited amount (a few percents) of assimilation of an old crustal component, in the form of bulk assimilation or AFC processes, which both can explain the Sr, Nd and Pb isotope data.

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Magmagenesis in a subduction-related post-collisional volcanic arc segment: the Ukrainian Carpathians

Cited by 76 publications

References 36 publications

Post-collisional Tertiary–Quaternary mafic alkalic magmatism in the Carpathian–Pannonian region: a review

Post-collisional Tertiary–Quaternary mafic alkalic magmatism in the Carpathian–Pannonian region: a review

Origin of the Laleaua Albă dacite (Baia Sprie volcanic area and Au-Pb-Zn ore district, Romania): evidence from study of melt inclusions

Origin of the absarokite–banakite association of the Damavand volcano (Iran): trace elements and Sr, Nd, Pb isotope constraints

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