Tectonothermal Evolution of the Apuseni Mountains, Romania: Resolution of Variscan versus Alpine Events with <sup>40</sup>Ar/<sup>39</sup>Ar Ages

Dallmeyer, R. D.; Pană, D.I.; Neubauer, Franz; Erdmer, Philippe

doi:10.1086/314352

Cited by 60 publications

(83 citation statements)

References 12 publications

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“…This back-thrust is interpreted to be responsible for a substantial offset of the "Main Tethyan Suture Zone" (Săndulescu 1994), the suture zone between Tisza and Dacia that formed during the mid-Cretaceous orogeny. This interpretation is supported by the radiometrically constrained Jurassic (186-156 Ma) and Early Cretaceous (124-111 Ma) ages of metamorphism within the Biharia nappe system (Dallmeyer et al 1999), which clearly pre-date Turonian thrusting.…”

Section: Tectonic Contacts Between Tisza and Neighbouring Units Timimentioning

confidence: 79%

“…Radiometric dating by Dallmeyer et al (1999) and fission track studies by Schuller (2004) indicate a poly-metamorphic history for the Biharia nappe system as a whole, with ages falling into two groups, namely Jurassic (186-156 Ma) and Early to middle Cretaceous (124-111 Ma). Thus, a Middle to Late Jurassic tectonic and metamorphic event, followed by Early Cretaceous top-E nappe stacking within the Dacia Mega-Unit, need to be distinguished.…”

Section: Getic-supragetic (Bucovinian) Nappe Sequencementioning

confidence: 99%

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

et al. 2008

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Section: Tectonic Contacts Between Tisza and Neighbouring Units Timimentioning

confidence: 79%

Section: Getic-supragetic (Bucovinian) Nappe Sequencementioning

confidence: 99%

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

et al. 2008

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“…The studied volcano is situated at the junction between the Codru-Moma and Highiș-Drocea Mts., at the tectonic boundary between the South and North Apuseni tectonic units (see inset Figure 1) [4][5][6]. An extensional regime in the Apuseni area during Middle Miocene time [4,7,8] was responsible for magma generation due to decompression melting of upper lithosphere/lower crust during eastward translation and clockwise rotation of the Intra-Carpathian blocks [1,[9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Note on the evolution of a Miocene composite volcano in an extensional setting, Zârand Basin (Apuseni Mts., Romania)

Seghedi

Szakács²,

Rosu

et al. 2010

Open Geosciences

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Bontǎu is a major eroded composite volcano filling the Miocene Zǎrand extensional basin, near the junction between the Codru-Moma and Highiș-Drocea Mountains, at the tectonic boundary between the South and North Apuseni Mountains. It is a quasi-symmetric structure (16-18 km in diameter) centered on an eroded vent area (9×4 km), buttressed to the south against Mesozoic ophiolites and sedimentary deposits of the South Apuseni Mountains. The volcano was built up in two sub-aerial phases (14-12.5 Ma and 11-10 Ma) from successive eruptions of andesite lava and pyroclastic rocks with a time-increasing volatile budget. The initial phase was dominated by emplacement of pyroxene andesite and resulted in scattered individual volcanic lava domes associated marginally with lava flows and/or pyroclastic block-and-ash flows. The second phase is characterized by amphibole-pyroxene andesite as a succession of pyroclastic eruptions (varying from strombolian to subplinian type) and extrusion of volcanic domes that resulted in the formation of a central vent area. Numerous debris flow deposits accumulated at the periphery of primary pyroclastic deposits. Several intrusive andesitic-dioritic bodies and associated hydrothermal and mineralization processes are known in the volcano vent complex area. Distal epiclastic deposits initially as gravity mass flows and then as alluvial volcaniclastic and terrestrial detritic and coal filled the basin around the volcano in its western and eastern part. Chemical analyses show that lavas are calc-alkaline andesites with SiO 2 ranging from 56-61%. The petrographical differences between the two stages are an increase in amphibole content at the expense of two pyroxenes (augite and hypersthene) in the second stage of eruption; CaO and MgO contents decrease with increasing SiO 2 . In spite of a ∼4 Ma evolution, the compositions of calc-alkaline lavas suggest similar fractionation processes. The extensional setting favored two pulses of short-lived magma chamber processes. Note on the evolution of a Miocene composite volcano in an extensional setting, Zǎrand Basin (Apuseni Mts., Romania) Keywords IntroductionIn the Apuseni Mountains, Neogene magmatism produced four NW-SE volcano-intrusive areas [1], between 14.7 to 7.4 Ma and ended with a brief small-volume eruption at ∼1.6 Ma (Uroi) [1][2][3]. The studied volcano is situated at the junction between the Codru-Moma and Highiș-Drocea Mts., at the tectonic boundary between the South and North Apuseni tectonic units (see inset Figure 1) [4][5][6]. An extensional regime in the Apuseni area during Middle Miocene time [4,7,8] was responsible for magma generation due to decompression melting of upper lithosphere/lower crust during eastward translation and clockwise rotation of the Intra-Carpathian blocks [1,[9][10][11]. This was probably coupled to asthenosphere upwelling and a higher thermal regime favoring partial melting and mixing processes [1,11]. The largest continuous volcanic area is ca. 100 km across and developed mainly in the Zǎrand dep...

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“…In the most external part of the South Carpathians a pre-Hercynian province could be outlined, obviously representing the north-western extension of the Moesian Plate. Within the Romanian Carpathians the radiometric K-Ar and 40 Ar/ 39 Ar ages, as well as newer fission-track data, do not sustain re-heating processes above 300 0 C and corresponding regional metamorphic events during meso-and neo-Alpine times (Dallmeyer et al, 1998(Dallmeyer et al, , 1999Bojar et al, 1998).…”

Section: Some Geochemical Remarks On Basalts From Băiţa Bihor (Bihor mentioning

confidence: 78%

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Studia UBB Geologia

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Tectonothermal Evolution of the Apuseni Mountains, Romania: Resolution of Variscan versus Alpine Events with ⁴⁰Ar/³⁹Ar Ages

Cited by 60 publications

References 12 publications

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

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

Note on the evolution of a Miocene composite volcano in an extensional setting, Zârand Basin (Apuseni Mts., Romania)

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Tectonothermal Evolution of the Apuseni Mountains, Romania: Resolution of Variscan versus Alpine Events with 40Ar/39Ar Ages

Cited by 60 publications

References 12 publications

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

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

Note on the evolution of a Miocene composite volcano in an extensional setting, Zârand Basin (Apuseni Mts., Romania)

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Tectonothermal Evolution of the Apuseni Mountains, Romania: Resolution of Variscan versus Alpine Events with ⁴⁰Ar/³⁹Ar Ages