Geochronology of the Neogene calc-alkaline intrusive magmatism in the "Subvolcanic Zone" of the Eastern Carpathians (Romania)

Pécskay, Zoltán; Seghedi, Ioan; Kovacs, Marinel; Szakács, Alexandru; Fülöp, Alexandrina

doi:10.2478/v10096-009-0012-5

Cited by 27 publications

(59 citation statements)

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“…In the CPR they cut exposed volcanic vent area rocks and volcanic deposits outside of the vent areas, or they cut basement rocks [159,200,207]. Some of the dikes were feeders of volcanic, especially effusive eruptions.…”

Section: Dikesmentioning

confidence: 99%

“…It is found in the CPR as an exposed subvolcanic intrusion in the sedimentary basement in the Visegrád area in Hungary (Figure 1-2b) [209], Salgótarján area at the Hungary/Slovakia boundary (Figure 1-2e) [224], the Lysá Stráž -Oblík zone in eastern Slovakia (Figure 1-4b) [225,226], and in the "Subvolcanic zone" of the Eastern Carpathians (Figure 1-6) [207]. Laccoliths take part also in the structure of volcanic core complexes [219].…”

Section: Laccolithsmentioning

confidence: 99%

“…In the CPR they mostly occur in basement rocks and rarely as intrusions in the vent or outside-vent areas [207,210,218]. In mature andesite stratovolcanoes they occur frequently along the volcanic/basement boundary [219] and/or take part in the structure of volcanic core complexes (an assemblage of volcanic and intrusive rocks in central zones of andesite stratovolcanoes affected by areal alteration)…”

Section: Sillsmentioning

confidence: 99%

“…They are either (I) "intravolcanic": (Ia) closely related to volcanic core-complexes (calderas or craters) associated with hydrothermal alteration and mineralization processes [159,[199][200][201][202], (Ib) intrusions tectonically controlled in earlier volcanic structures [203][204][205][206] or (II) "hypabyssal", emplaced in basement rocks [207]. Most of the intrusions associated with volcanic 229 Brought to you by | MIT Libraries Authenticated Download Date | 5/9/18 10:40 PM activity are buried and reached only through drilling or mining works.…”

Section: Intrusive Forms Related To Intermediate Calcalkaline Rocksmentioning

confidence: 99%

“…Intermediate calc-alkaline subsurface intrusions show a large petrographic range from basalts (gabbro-diorite) to andesite (diorite) to rhyolites (granite) and a wide range of textures, commonly related to the depth of cooling. They usually form independent bodies piercing various basement lithologies (metamorphic or sedimentary) [207][208][209][210]. The independent intrusions are mostly outcropping in strongly eroded terranes [211].…”

Section: Intrusive Forms Related To Intermediate Calcalkaline Rocksmentioning

confidence: 99%

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Neogene-Quaternary Volcanic forms in the Carpathian-Pannonian Region: a review

et al. 2010

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Neogene to Quaternary volcanic/magmatic activity in the Carpathian-Pannonian Region (CPR) occurred between 21 and 0.1 Ma with a distinct migration in time from west to east. It shows a diverse compositional variation in response to a complex interplay of subduction with roll-back, back-arc extension, collision, slab break-off, delamination, strike-slip tectonics and microplate rotations, as well as in response to further evolution of magmas in the crustal environment by processes of differentiation, crustal contamination, anatexis and magma mixing. Since most of the primary volcanic forms have been affected by erosion, especially in areas of post-volcanic uplift, based on the level of erosion we distinguish: (1) areas eroded to the basement level, where paleovolcanic reconstruction is not possible; (2) deeply eroded volcanic forms with secondary morphology and possible paleovolcanic reconstruction; (3) eroded volcanic forms with remnants of original morphology preserved; and (4) the least eroded volcanic forms with original morphology quite well preserved. The large variety of volcanic forms present in the area can be grouped in a) monogenetic volcanoes and b) polygenetic volcanoes and their subsurface/intrusive counterparts that belong to various rock series found in the CPR such as calc-alkaline magmatic rock-types (felsic, intermediate and mafic varieties) and alkalic types including K-alkalic, shoshonitic, ultrapotassic and Na-alkalic. The following volcanic/subvolcanic forms have been identified: (i) domes, shield volcanoes, effusive cones, pyroclastic cones, stratovolcanoes and calderas with associated intrusive bodies for intermediate and basic calc-alkaline volcanism; (ii) domes, calderas and ignimbrite/ash-flow fields for felsic calc-alkaline volcanism and (iii) dome flows, shield volcanoes, maars, tuffcone/tuff-rings, scoria-cones with or without related lava flow/field and their erosional or subsurface forms (necks/ plugs, dykes, shallow intrusions, diatreme, lava lake) for various types of K-and Na-alkalic and ultrapotassic magmatism. Finally, we provide a summary of the eruptive history and distribution of volcanic forms in the CPR using several sub-region schemes.

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Section: Dikesmentioning

confidence: 99%

Section: Laccolithsmentioning

confidence: 99%

Section: Sillsmentioning

confidence: 99%

Section: Intrusive Forms Related To Intermediate Calcalkaline Rocksmentioning

confidence: 99%

Section: Intrusive Forms Related To Intermediate Calcalkaline Rocksmentioning

confidence: 99%

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Neogene-Quaternary Volcanic forms in the Carpathian-Pannonian Region: a review

et al. 2010

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Asthenosphere-induced melting of diverse source regions for East Carpathian post-collisional volcanism

Gartner

Seghedi

Nikogosian

et al. 2020

Contrib Mineral Petrol

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The occurrence of post-subduction magmatism in continental collision zones is a ubiquitous feature of plate tectonics, but its relation with geodynamic processes remains enigmatic. The nature of mantle sources in these settings, and their interaction with subduction-related components, are difficult to constrain using bulk rocks when magmas are subject to mixing and assimilation within the crust. Here we examine post-collisional magma sources in space and time through the chemistry of olivine-hosted melt inclusions and early-formed minerals (spinel, olivine and clinopyroxene) in primitive volcanic rocks from the Neogene-Quaternary East Carpathian volcanic range in Călimani (calc-alkaline; 10.1-6.7 Ma), Southern Harghita (calc-alkaline to shoshonitic; 5.3-0.03 Ma) and the Perșani Mountains (alkali basaltic; 1.2-0.6 Ma). Călimani calc-alkaline parental magma compositions indicate a lithospheric mantle source metasomatised by ~ 2% sediment-derived melts, and are best reproduced by ~ 2-12% melting. Mafic K-alkaline melts in Southern Harghita originate from a melt-and fluidmetasomatised lithospheric mantle source containing amphibole (± phlogopite), by ~ 5% melting. Intraplate Na-alkaline basalts from Racoș (Perșani) reflect small-degree (1-2%) asthenosphere-derived parental melts which experienced minor interaction with metasomatic components in the lithosphere. An important feature of the East Carpathian post-collisional volcanism is that the lithospheric source regions are located in the lower plate (distal Europe-Moesia), rather than the overriding plate (Tisza-Dacia). The volcanism appears to have been caused by (1) asthenospheric uprise following slab sinking and possibly south-eastward propagating delamination and breakoff, which induced melting of the subduction-modified lithospheric mantle (Călimani to Southern Harghita); and (2) decompression melting as a consequence of minor asthenospheric upwelling (Perșani).

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