Tertiary Quaternary subduction related magmatism in the Carpathian-Pannonian Region
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1 Tertiary Quaternary subduction related magmatism in the Carpathian-Pannonian Region
2 Andreucci et al., 2014
3 Moores & Fairbridge, 1998
4 the Mediterranean collision zone Eurasia = Lower Plate Africa & Adria = Lower Plate???? Schmidt, 2011
5 Anorogen magmatic activity Harangi et al., 2006
6 The Alpine-Mediterranean region is one of the most complex geodynamic settings on the Earth. In the region Tertiary Quaternary subduction was governed by the convergence between Eurasia and Africa where continental and oceanic microplates were trapped between the converging continental plates. The region is characterized by: orogen zones, extensional basins, mantle upwelling, variable igneous activities, variable collisional orogen belts: topographic elevations: rate of convergence > rate of subduction advecting subduction: Alps low topographic relief and regional extension: rate of subduction > rate of of convergence retreating subduction: Betics- Arboran-Rif, Apennines, Carpathian thrust belts
7 Complex tectonic evolution and geodynamic environment resulted in highly variable (subduction related) igneous activities (low-k tholeiite, calc-alkali, shoshonite, ultrapotassic, silicis series basalt is subordinated: crystallization in shallow magma chamber). But: there are within plate alkali basalts, generally younger than volcanic rocks related to subductoin, and hardly show subductionrelated geochemical features. Petrogenesis: devolatilization of subducted slab metasomatism in mantle wedge (by volatiles) partial melt of mantle wedge calc-alkaline igneous activity (< 30 m.y.) Calc-alkaline (CA) volcanics (e.g., andesite, dacite) is associated with active subduction zones. Based on trace elements, radiogenic and stable (O) isotopes, if the source of magmas is linked to mantle, enriched in subduction-related fluids, then such magmas can be considered subduction-related magmas regardless the geodynamic circumstances.
8 Subduction-related igneous areas within the Alpine-Mediterranean region segments: 1. Betic-Alboran-Rif province, 2. Central Mediterranean, 3. Alps (Periadriatic-Insurbic Line), 4. Carpathian-Pannonian region, 5. Dinarides and Rhodope, 6. Aegean sea and Anatolia
9 Trace element classification in function of ionic radius and ionic charge Ionic potential: charge/radius - an approx. indexes of mobility (solubility) in aqueous solution: <3 high mobility & >12 low mobility 1) Low field strength (LFS) or large ion lithophile (LIL) elements Fe 2) High field strength (HFS) elements: RFF/REE - Y 3) Platinum group (PG) elements
10 Trace elements: contribution of aqueous fluids and/or Si-rich melts to formation of magmas subducted oceanic slab (residual mantle, mafic oceanic crust and sediments). Abundance of LIL elements (Cs, Rb, Ba, K, Sr, Pb) soluble in aqueous medium is higher than HFS elements (Nb, Ta, Zr, Hf, és Ti), which are immobile in aqueous medium, as well as REY elements. Th (and U) enrichment subduction of pelagic or terrestrial sediments.
11 Harangi et al., 2006
12 Following subduction of oceanic lithosphere after the subsequent collision of continent-continent, lithosphere and continental crust became thick (c, d). Detachment of dense oceanic slab and delamination of the lithosphere, often including dense mafic lower crust, as well as convection erosion of the lower lithosphere are the result of the postcollisional extension and related igneous activity. Showing geochemical signs of subduction-related metasomatism Harangi et al., 2006
13 Distribution of volcanic formations in the Carpathian-Pannonian region (CPR) Lexa et al., 2010
14 Tokaj-Eperjesi Timing of CPR volcanic activity in subregions as shown in the previous figure Lexa et al., 2010
15 Harangi Lenkey, 2007
16 Harangi Lenkey, 2007
17 Harangi Lenkey, 2007
18 - High lithologic and chemical Variability indicating complex petrogenetic processes: Different mantle source, Contamination of different crustal materials, and Different degree of Fractional crystallization, - K-UK rocks, Fig. 6 - IOB-type alkali (natron) magmas similar to those in the ECRIS; mantle source is different, slight subducted slab signature in the Mediterranean Harangi et al., 2006
19
20 Enrichment in LILE, depletion in HFSE subduction, or subduction-related metasomatism (or crustal contamination at shallow depth) Harangi et al., 2006
21 Figure 5. Primitive mantle normalized (McDonough and Sun, 1995) trace-element patterns of representative samples of the Neogene to Quaternary volcanic rocks of the Carpathian- Pannonian region. For references for the data, see Table 1. NPB northern Pannonian Basin. LILE <> HFSE Harangi Lenkey, 2007
22 -The same trend, except Betics - Mixing of twocomponents: DMM or HIMU, and am enriched component, - High 87 Sr/ 86 Sr ratio indicates contribution of upper crust (subduction) Harangi et al., 2006
23 AB <> the others DMM HIMU enriched component AB <> CA SH U-poor source Harangi Lenkey, 2007
24 Incorporation of the crust in magma genesis. Upper crust: +5.5 Continental and oceanic crust: high (significant alteration and interaction with ocean water) At convergent plates crust can be added to mantle in form of terrestrial or pelagic sediments during subduction of oceanic slab (source contamination) or melting of crustal material (crustal contamination) Analyses: phenocrysts bulk Signiifcant crustal contamination Harangi et al., 2006
25 W-Carpath: radiogen Srenriched lower crust and a mantle component with low 87 Sr/ 86 Sr and high 206 Pb/ 204 Pb ratios. E-Carpath: radiogen Srenriched lower crust and a mantle component with low 87 Sr/ 86 Sr and low 206 Pb/ 204 Pb ratios (DMM?). D-Hargita shoshonites: low 206 Pb/ 204 Pb ratio, EM-I component is indicated. Alkali basalts: DMM-FOZO (HIMU) CPR: mixtures of multicomponents, complex processes Harangi et al., 2006
26 EAR European Astenospheric Reservoir at the W-Carpathians Harangi Lenkey, 2007
27 Based on 87 Sr/ 86 Sr and 206 Pb/ 204 Pb isotopes, an enriched mantle component, similar to that of alkali basalts, played significant role in genesis of magmas related to subduction. Source: mantle plume or long-termed (late Mesozoic) shallow mantle component. This latter one: 1/ deflection of a mid-atlantic mantle plume, which can be present beneath the CPR by driving of slab roll-back or slab break-off in form of mantle flow. 2/ the result of chemical variability is a highly inhomogeneous mantle, which developed by different degree of crustal contamination sampled accedently by the magmas.
28 Harangi et al., 2006
29 Igneous rocks related to subduction are characterized by high 87 Sr/ 86 Sr, low 143 Nd/ 144 Nd and high 207 Pb/ 204 Pb as well as 208 Pb/ 204 Pb ratios compared to MORB (continental crustal component, namely interaction: subduction or magma mixture). These features can be inherited from mantle which was previously modified by fluids/melts originated from subducted slab.
30 Különböző stílusú szubdukciós zónák jelenléte (szubdukció sebessége, szubdulált lemez fizikai és kémiai tulajdonsága, szubdukció polaritása) Ny-i vegenciájú szubdukció a köpeny folyást megakadályozta, viszont meredek szubdukciós szöget, lemez roll-back-et (visszahajlást), extenziós medencék felnyílását és a szubdukció befejezését eredményezte, amikor az continentális litoszféra lemez elérte az árkot. K-i vergenciájú szubdukció segítette a köpeny folyást, kis szubdukciós szöget eredményezett és extenzió hiányát mutatja.
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