Timing and tectonic significance of Paleozoic magmatism in the Sakar unit of the Sakar-Strandzha Zone, SE Bulgaria

Bonev, Nikolay; Filipov, Petyo; Raicheva, Raya; Moritz, Robert

doi:10.1080/00206814.2019.1575090

Cited by 27 publications

(45 citation statements)

References 62 publications

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“…The margins of the late-Carboniferous to early Permian Sakar Pluton (305-295 Ma [9,12,28]; Figure 6A) are affected by extensive Na-albitization, as documented by Kamenov et al, [11] and Pristvova et al, [12], along with the vein systems such as those are observed at Kanarata quarry ( Figure 6B,C). The obtained U-Pb LA-ICP-MS ages of 149 ± 7 Ma on apatite and 114 ± 1 Ma on titanite, respectively, suggest two discrete crystallization ages within the Sakar Pluton.…”

Section: Geotectonic Implications Of the Apatite And Titanite Agesmentioning

confidence: 81%

“…111 Ma [21,[24][25][26][27] and likely reflect a regional thermal overprint. However, preliminary U-Pb zircon dating results presented by Peytcheva et al [28], Bonev et al [9], and Pristavova et al [20] yield late-Carboniferous to early Permian (ca. 305 Ma to ca.…”

Section: Geological Settingmentioning

confidence: 99%

“…300 Ma) ages also provide a minimum age for the host rocks of the Sakar Pluton (the Strandja Massif). The Strandja Massif has widely been accepted as Precambrian in age [29], although there are no modern geochronological studies, apart from the recent study by Bonev et al, [9], which indicates the presence of an Ordovician magmatic event in the massif. Thus the Paleozoic, pre-Carboniferous evolution of the Strandja Massif thus remains uncertain.…”

Section: Geological Settingmentioning

confidence: 99%

“…The enigmatic Cimmerian Orogeny in Southeastern Europe, however, is difficult to identify mostly due to the pervasive later Alpine orogenic overprint [8]. In Southeastern Bulgaria, the late Variscan Sakar pluton intrudes the pre-Variscan basement [9] and is in turn affected by later events of deformation and metamorphism, which in the past have been attributed to the Alpine Orogeny [10]. Many of the Sakar granitoids are affected by a series of veins and pervasive albitization, connected with Na-metasomatism of undetermined age [11,12].…”

Section: Introductionmentioning

confidence: 99%

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Two-Stage Late Jurassic to Early Cretaceous Hydrothermal Activity in the Sakar Unit of Southeastern Bulgaria

et al. 2020

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Southeastern Bulgaria is composed of a variety of rocks from pre-Variscan (ca. 0.3 Ga) to pre-Alpine sensu lato (ca. 0.15 Ga) time. The Sakar Unit in this region comprises a series of granitoids and gneisses formed or metamorphosed during these events. It is cut by a series of post-Variscan hydrothermal veins, yet lacks pervasive Alpine deformation. It thus represents a key unit for detecting potential tectonism associated with the enigmatic Cimmerian Orogenic episode, but limited geochronology has been undertaken on this unit. Here we report age constraints on hydrothermal activity in the Sakar Pluton. The investigated veins contain mainly albite–actinolite–chlorite–apatite–titanite–quartz–tourmaline–epidote and accessory minerals. The most common accessory minerals are rutile and molybdenite. Apatite and titanite from the same vein were dated by U–Pb LA–ICP-MS geochronology. These dates are interpreted as crystallization ages and are 149 ± 7 Ma on apatite and 114 ± 1 Ma on titanite, respectively. These crystallization ages are the first to document two stages of hydrothermal activity during the late Jurassic to early Cretaceous, using U–Pb geochronology, and its association with the Cimmerian orogenesis. The Cimmerian tectono-thermal episode is well-documented further to the east in the Eastern Strandja Massif granitoids. However, these are the first documented ages from the western parts of the Strandja Massif, in the Sakar Unit. These ages also temporally overlap with previously published Ar–Ar and K–Ar cooling ages, and firmly establish that the Cimmerian orogeny in the studied area included both tectonic and hydrothermal activity. Such hydrothermal activity likely accounted for the intense albitization found in the Sakar Unit.

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Section: Geotectonic Implications Of the Apatite And Titanite Agesmentioning

confidence: 81%

Section: Geological Settingmentioning

confidence: 99%

Section: Geological Settingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Two-Stage Late Jurassic to Early Cretaceous Hydrothermal Activity in the Sakar Unit of Southeastern Bulgaria

et al. 2020

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“…The locations of samples are given in Figures 1 and 3 and Supplementary Table S1 (available online at https://doi.org/10.1017/S0016756819001183). The sample preparation and analytical procedures are the same as described by Bonev et al (2019a). The analytical data are presented in Supplementary Table S2 (available online at https://doi.org/10.…”

Section: A U-pb Zircon Geochronologymentioning

confidence: 99%

Detrital zircon age and Sr isotopic constraints for a Late Palaeozoic carbonate platform in the lower Rhodope thrust system, Pirin, SW Bulgaria

et al. 2019

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We focused on the Pirin–Pangeon–Thasos carbonate sequence of the Rhodope thrust system, combining Sr isotopes from marble with U–Pb dating of detrital zircons from interlayered schists with outcrop near the villages of Ilindentsi and Petrovo in Bulgaria. The youngest zircon age at Ilindentsi is 266 Ma, i.e. Middle Permian, while the youngest zircon at Petrovo yielded an age of 290 Ma, i.e. Early Permian. Strontium isotopes range from 0.707420 to 0.707653, and are consistent with a Middle Permian maximum depositional age. Middle Permian sedimentation of this carbonate platform most likely occurred along the Eurasian margin rather than the Gondwana margin.

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Late Palaeozoic extensional volcanism along the northern margin of Gondwana in southern Turkey: implications for Palaeotethyan development

Robertson

Parlak

Ustaömer

2021

Int J Earth Sci (Geol Rundsch)

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The Late Palaeozoic–Early Mesozoic Tethyan development of the Eastern Mediterranean region remains debatable, especially in Turkey, where alternative northward and southward subduction hypotheses are proposed. Relevant to this debate, new whole-rock geochemical data are provided here for early Carboniferous (Late Tournaisian-Late Visean; c. 340–350 Ma) tuffaceous sedimentary rocks within the Çataloturan thrust sheet (Aladağ nappe), eastern Taurides. The tuffs accumulated from evolved alkaline volcanism, variably mixed with terrigenous and radiolarian-rich sediments. In addition, Late Palaeozoic meta-volcanic rocks, c. 150 km farther NE, within the Binboğa (= Malatya) metamorphics (a low-grade high-pressure unit), are indicative of a within-plate setting. An impersistent geochemical subduction signature in these volcanics may represent an inherited, rather than contemporaneous, subduction influence, mainly because of the absence of a continental margin arc or of arc-derived tuff. Both the Binboğa metamorphics and the Çataloturan thrust sheet (Aladağ nappe) restore generally to the north of the relatively autochthonous Tauride carbonate platform (Geyik Dağ), within the carbonate platform bordering north-Gondwana. The Çataloturan thrust sheet is interpreted, specifically, as a c. E–W, deep-water, volcanically active rift that progressively infilled. Regional geological evidence suggests that melange units (Konya Complex, Afyon zone), Teke Dere unit, Lycian nappes), and Chios–Karaburun melange, E Aegean) accreted to the north-Gondwana continental margin during the late Carboniferous; this was coupled with localised calc-alkaline granitic magmatism (Afyon zone of Anatolide crustal block). We propose an interpretation in which Late Devonian–Carboniferous alkaline intra-plate volcanism relates to extension/rifting along the north-Gondwana margin. In contrast, the melange accretion and granitic magmatism could relate to short-lived late Carboniferous southward subduction that accompanied the diachronous closure of Palaeotethys.

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Timing and tectonic significance of Paleozoic magmatism in the Sakar unit of the Sakar-Strandzha Zone, SE Bulgaria

Cited by 27 publications

References 62 publications

Two-Stage Late Jurassic to Early Cretaceous Hydrothermal Activity in the Sakar Unit of Southeastern Bulgaria

Two-Stage Late Jurassic to Early Cretaceous Hydrothermal Activity in the Sakar Unit of Southeastern Bulgaria

Detrital zircon age and Sr isotopic constraints for a Late Palaeozoic carbonate platform in the lower Rhodope thrust system, Pirin, SW Bulgaria

Late Palaeozoic extensional volcanism along the northern margin of Gondwana in southern Turkey: implications for Palaeotethyan development

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