Deep crustal structure beneath the central and inner West Carpathians

Tomek, Čestmǐr

doi:10.1016/0040-1951(93)90130-c

Cited by 79 publications

(47 citation statements)

References 28 publications

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“…1), while the lat ter ex pe ri enced mostly back-arc ex ten sion and only soft col li sion that was not ca pa ble of sub stan tial up lift and ex hu ma tion of deeply bur ied Penninic com plexes. This con cept was ap plied to in ter pre ta tion of deep seis mic re flec tion lines and grav ity mod els of the West ern Carpathians (Tomek, 1993;Bielik et al, 2004) de pict ing the South Penninic su ture as a flatly ly ing re flec tive chan nel un der ly ing the Tatric thickskinned thrust sheet at mid-crustal lev els. Fol low ing the Al pine model, any sur face units sus pected as rem nants of the South Penninic accretionary com plexes should be lo cated along zones at the con tact of the north ern Austroalpine (Tatric in the Carpathians) mar gin with the Pieniny Klippen Belt, which is com monly in ter preted as a relic of a con ti nen tal frag ment in a Mid dle Penninic po si tion (e.g., Plašienka, 2003;Jurewicz, 2005;Froitzheim et al, 2008).…”

Section: Introductionmentioning

confidence: 94%

Jurassic syn-rift and Cretaceous syn-orogenic, coarse-grained deposits related to opening and closure of the Vahic (South Penninic) Ocean in the Western Carpathians – an overview

Plašienka

2012

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Al though no un doubted oce anic crustal rock com plexes of Penninic af fin ity par tic i pate in the pres ent sur face struc ture of the West ern Carpathians, in di rect lines of ev i dence sug gest pro lon ga tion of the South Penninic-Vahic oce anic tract into the an cient Carpathians. The sed i men tary re cord of both the syn-rift and syn-orogenic clastic de pos its re veal their or i gin be tween the outer Tatric (Austroalpine) and the in ner Oravic (Mid dle Penninic) mar gins. The rift ing re gime is ex em pli fied by the nor mal fault-re lated scarp brec cias of the Ju ras sic Borinka Unit in the Malé Karpaty Mts., which are char ac ter ized by lo cal, grad u ally de nuded source ar eas. Two other re gions pro vide exam ples of a contractional re gime, both re lated to short en ing and clo sure of the Vahic oce anic do main. The Belice Unit in the Považský Inovec Mts. in cludes Up per Ju ras sic-Lower Cre ta ceous eupelagic, mostly si li ceous de pos its and a thick en ing-up wards Senonian sequence of turbiditic sand stones, con glom er ates and cha otic brec cias. It is in ferred that this suc ces sion rep re sents the sed i men tary cover of oce anic crust ap proach ing a trench, its in cor po ra tion in the accretionary com plex and fi nally underthrusting be low the outer Tatric mar gin. In the Oravic units of the Pieniny Klippen Belt, deep-ma rine con glom er ate/brec cia bod ies with olistoliths in di cate col li sion-related thrust stack ing that started from the Maastrichtian (Gregorianka Brec cia of the Sub-Pieniny Unit) and ter mi nated with the Lower Eocene Milpoš Brec cia in the Šariš Unit. In ad di tion, a ten ta tive re cy cling scheme of "ex otic" clastic ma te rial from mid-Cre ta ceous conglom er ates of the Klape Unit to var i ous Klippen Belt units is out lined. This ma te rial is con sid ered to be un re lated to the Vahic oce anic realm and its clo sure, and likely rep re sents ero sional prod ucts of more dis tant orogenic zones. Dušan Plašienka, De part ment of Ge ol ogy and Palae on tol ogy, Fac ulty of Nat u ral Sci ences, Comenius Uni ver sity,

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Section: Introductionmentioning

confidence: 94%

Jurassic syn-rift and Cretaceous syn-orogenic, coarse-grained deposits related to opening and closure of the Vahic (South Penninic) Ocean in the Western Carpathians – an overview

Plašienka

2012

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“…Maher 1986;Plašienka et al 1997;Plašienka 1999;Bielik et al 2004;Bezák et al 2011a). According to seismic data, the Tatric Superunit is a tabular body about 10 km thick (Tomek 1993) rooted under the Veporic Superunit, the basement of which is formed by similar Paleozoic and Mesozoic lithologies. Seismic reflection profiles (Vozár & Šantavý 1999) as well as magnetotelluric modelling in the Tribeč Mts (Bezák et al 2011b) point to the stacking and shortening of the crystalline basement within the Tatric Superunit especially in the western part of the Western Carpathians.…”

Section: Introductionmentioning

confidence: 99%

Variscan thrusting in I- and S-type granitic rocks of the Tribeč Mountains, Western Carpathians (Slovakia): evidence from mineral compositions and monazite dating

Broska¹,

Petrík²

2015

Geologica Carpathica

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Abstract:The Tribeč granitic core (Tatric Superunit, Western Carpathians, Slovakia) is formed by Devonian/Lower Carboniferous, calc-alkaline I-and S-type granitic rocks and their altered equivalents, which provide a rare opportunity to study the Variscan magmatic, post-magmatic and tectonic evolution. The calculated P-T-X path of I-type granitic rocks, based on Fe-Ti oxides, hornblende, titanite and mica-bearing equilibria, illustrates changes in redox evolution. There is a transition from magmatic stage at T ca. 800-850 °C and moderate oxygen fugacity (FMQ buffer) to an oxidation event at 600 °C between HM and NNO up to the oxidation peak at 480 °C and HM buffer, to the final reduction at ca. 470 °C at ∆NN = 3.3. Thus, the post-magmatic Variscan history recorded in I-type tonalites shows at early stage pronounced oxidation and low temperature shift back to reduction. The S-type granites originated at temperature 700-750 °C at lower water activity and temperature. The P-T conditions of mineral reactions in altered granitoids at Variscan time (both I and S-types) correspond to greenschist facies involving formation of secondary biotite. The Tribeč granite pluton recently shows horizontal and vertical zoning: from the west side toward the east S-type granodiorites replace I-type tonalites and these medium/coarse-grained granitoids are vertically overlain by their altered equivalents in greenschist facies. Along the Tribeč mountain ridge, younger undeformed leucocratic granite dykes in age 342 ±4.4 Ma cut these metasomatically altered granitic rocks and thus post-date the alteration process. The overlaying sheet of the altered granites is in a low-angle superposition on undeformed granitoids and forms "a granite duplex" within Alpine Tatric Superunit, which resulted from a syn-collisional Variscan thrusting event and melt formation ~340 Ma. The process of alteration may have been responsible for shifting the oxidation trend to the observed partial reduction.

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“…Based on seismic data (Tomek 1993), we suspect, however, that in the Central West Carpathians remnants of the Vahicum separate the Tatricum from suspected Subpenninic elements at depth (Plate 2, Profile 2). In Eastern Slovakia and Ukraine boreholes have reached, in the subsurface of the East Slovak basin, the Iňačovce-Kriscevo Unit that includes some serpentinite bodies (Soták et al l993, l994, 2000) (Fig.…”

Section: Remnants Of the Alpine Tethys In Alcapamentioning

confidence: 99%

“…However, we suspect the presence of such Subpenninic units in the subsurface also further to the east, namely in the West Carpathians (Plate 2, Profiles 1 & 2). Information on the deep structure of the West Carpathians is provided by a seismic transect presented by Tomek (1993) who assigned a large rock volume below the Alpine Tethys suture (Vahicum; Plašienka 1995a,b) to the Briançonnais. Yet, as the Briançonnais paleogeographic domain proper terminates west of the Tauern window (Schmid et al 2004a), except for some small analogous crustal slivers found in the Pieniny Klippen Belt of the West Carpathians (Birkenmajer 1986;Trümpy 1988), we prefer to attribute this rock volume to the distal European margin, that is, to the Subpenninic units.…”

Section: Europe-derived Units Within Alcapamentioning

confidence: 99%

The Alpine-Carpathian-Dinaridic orogenic system: correlation and evolution of tectonic units

et al. 2008

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Deep crustal structure beneath the central and inner West Carpathians

Cited by 79 publications

References 28 publications

Jurassic syn-rift and Cretaceous syn-orogenic, coarse-grained deposits related to opening and closure of the Vahic (South Penninic) Ocean in the Western Carpathians – an overview

Jurassic syn-rift and Cretaceous syn-orogenic, coarse-grained deposits related to opening and closure of the Vahic (South Penninic) Ocean in the Western Carpathians – an overview

Variscan thrusting in I- and S-type granitic rocks of the Tribeč Mountains, Western Carpathians (Slovakia): evidence from mineral compositions and monazite dating

The Alpine-Carpathian-Dinaridic orogenic system: correlation and evolution of tectonic units

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