Low-grade metamorphic rocks from the Pulur complex, NE Turkey: implications for the pre-Liassic evolution of the Eastern Pontides

Topuz, Gültekın; Altherr, Rainer; Satır, Muharrem; Schwarz, Winfried H.

doi:10.1007/s00531-003-0372-5

Cited by 91 publications

(47 citation statements)

References 76 publications

(82 reference statements)

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“…The cooling of the granulite facies metamorphic rocks to 300 C o lasted to c. 310 Ma (Topuz et al, 2004a). The timing low-grade metamorphism in the Pulur region is much younger than high grade metamorphism (~260 Ma, Topuz, Altherr, Satır, & Schwarz, 2004b). Beside this direct data, rims Figure 12.…”

Section: The Variscan Metamorphism In the Sakarya Zonementioning

confidence: 93%

Devonian magmatism in the western Sakarya Zone, Karacabey region, NW Turkey

Sunal

2012

Geodinamica Acta

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The Karacabey Pluton is a large magmatic body in the northwestern Turkey overthrust by the probable Triassic metamorphic rocks of the Lower Karakaya Complex. Both the metamorphic rocks and the Karacabey Pluton are unconformably overlain by a Lower Jurassic and younger sedimentary sequence. The Karacabey Pluton was regarded as a Carboniferous intrusion based on the previous K-Ar biotite geochronological data. Here, we provide new geological, geochemical and geochronological data from the Karacabey Pluton. Zircon U-Pb results from two samples yielded ages of 393.8 +/−2.7 to 395.9 +/−4.09 Ma, suggesting that the granitoids intruded in the crust throughout the Early to Middle Devonian. The Karacabey Pluton consists mainly of biotite and locally hornblende bearing granitoid with lesser amounts of S-type leucocratic granodiorite, all of which are cut by pegmatitic bodies. It belongs to the high-K calc-alkaline series with distinct Nb and Ta anomalies in multi-element spider diagram. Sr and Nd isotopes' initial values are 0.709-0.712 and 0.511-0.512, respectively. εNd(i) values range between −7.8 and −9.4. The isotopic characteristics of the rocks indicate lower crustal sources of both metapelitic and metaigneous origin. Geochemical features of the rocks suggest that they developed in an arc-related environment, along with the other Devonian granitoids described from the Biga Peninsula in northwest Turkey. The granitoid shows a low-temperature alteration/metamorphism marked by recrystallization of quartz, sericitization of the feldspar and formation of late chlorite, epidote and muscovite. Possibly because of these, the Ar-Ar biotite ages are scattered with a possible concentration at around Permo-Carboniferous boundary. Zircon (U-Th)/He geochronology suggests that after the granitoid was reburied during Early Jurassic to Early Cretaceous sedimentation, there was renewed uplift and erosion during the Late Cretaceous (Turonian), which is possibly related to the closure of the Intra-Pontide Ocean in the north.Keywords: Karacabey Pluton; Sakarya Zone; geochemistry; zircon U-Pb, biotite Ar-Ar and zircon (U-Th)/He ages IntroductionThe Sakarya Zone of the Pontides is an E-W trending belt bounded by Istanbul Zone in the north and by the Izmir-Ankara Suture in the south (Figures 1 and 2). It consists of a complex basement overlain by Jurassic and younger sedimentary sequence. The basement rocks of the Sakarya Zone can be divided into two separate parts: 1. Paleozoic plutonic and metamorphic rocks possibly related to the Variscan orogeny and 2. Triassic accretionary complexes with blueschists and eclogites, called as the Karakaya Complex (Okay & Göncüoğlu, 2004;Okay & Tüysüz, 1999;Okay, Satır & Siebel, 2006).Most of the plutonic rocks in the basement of the Sakarya Zone are of Carboniferous age (350-320 Ma, Figure 1). These can traced from the Kazdağ Massif in the Biga peninsula (308-329 Ma, Okay et al., 1996, through west of Ankara (~290 Ma, Okay et al., 2006, 319-327 Ma;Robertson, 2012) and Central Pontides (275-295 Ma, Nzeg...

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Section: The Variscan Metamorphism In the Sakarya Zonementioning

confidence: 93%

Devonian magmatism in the western Sakarya Zone, Karacabey region, NW Turkey

Sunal

2012

Geodinamica Acta

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“…In the Pulur massif, the Cenci unit representing the Variscan basement at north and the low-degree metamorphic rocks of Do¤ankavak unit at south are noticeable (Topuz et al, 2004a, b). Ar/Ar data on fengite minerals from the Do¤ankavak unit yielded 260 Ma and these units and tectonic contact among them are unconformably covered with Liassic deposits (Topuz et al, 2004b). Keskin et al (1989) recognized Devonian-early Carboniferous carbonates and ophiolitic rock slices within the low grade metamorphites of the Pulur massif.…”

Section: Discussionmentioning

confidence: 99%

“…On the one hand, different metamorphic character of these metamorphites, their late Permian (Topuz et al, 2004b) Okay, 2000;Yal›n›z and Göncüo¤lu, 2002) and the presence of Devonian, Carboniferous and Permian pelagic blocks within the Triassic units can only be explained by active continental margin character of southern Sakarya Zone during the Permo-Triassic.…”

Section: Discussionmentioning

confidence: 99%

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Late Permian Unconformity Around Ankara and New Age Data on the Basement Rocks, Ankara, Turkey

Sevin¹,

Dönmez²,

Atıcı³

et al. 2015

Bulletin of the Mineral Research and Exploration

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At southwest of Gölbafl› (Ankara) there are two different sequences in tectonic contact. The one at the bottom with low-degree metamorphism is represented by phyllite, metabasite, crystallized limestone, schist and quartz porphyry veins. Above them are early Carboniferous-late Permian neritic and pelagic carbonates which are unconformably overlain by late Permian clastics and carbonates. Samples collected from neritic carbonates yielded early Carboniferous (Visian-Serpuhovian) to middle Carboniferous (Bashkirian-Moskovian) ages. These carbonates of shallow facies character are overlain by radiolaritebearing pelagic deposits of middle Carboniferous-Permian age. Fossils from the upper most neritic carbonates gave Kubergandian-Murgabian age. This Permo-Carboniferous sequence is unconformably overlain by a sequence consisting of clastics and carbonates. Basal conglomerates and sandstones contain abundant quartz and fewer amounts of carbonated-cemented metamorphic rock fragments and they change to medium-thick bedded dolomitic limestone and limestones to the top. The age of these carbonates of shallow marine character is found Murgabian-Dorashamian. It is suggested that late Paleozoic carbonate basement was deposited in a neritic environment during early-middle Carboniferous, in a pelagic environment during middle Carboniferous-Permian and again in a neritic environment during Kubergandian-Murgabian. Following a deformation stage, it was accreted onto the Variscan basement at north and carbonate deposition took place as a result of late Permian transgression and finally some of exotic blocks within the upper Karakaya Complex were derived from this basement.

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“…Robertson, Parlak, & Ustaömer, 2009;Robertson & Ustaömer, 2009a, 2009bZanchi, Garzanti, Larghi, Angiolini, & Gaetani, 2003) (ii) Permo-Triassic metamorphic and volcano-sedimentary accretionary complexes (e.g. Okay, 1984;Okay & Göncüoğlu, 2004;Okay, Monod, & Monié, 2002;Okay, Noble, & Tekin, 2011;Pickett & Robertson, 1996;Robertson & Ustaömer, 2012;Sayit, Göncüoglu, & Furman, 2010;Topuz, Altherr, Satır, & Schwarz, 2004;Topuz, Okay, et al, 2013), (iii) Early to Middle Jurassic metamorphic accretionary complexes Topuz, Göçmengil, et al, 2013) and (iv) Early to Late Cretaceous mainly non-metamorphic accretionary complexes (e.g. Bailey & McCallien, 1950, 1953Bragin & Tekin, 1996;Çapan & Floyd, 1985;Eyüboğlu, Bektaş, & Pul, 2007;Gökten & Floyd, 2007;Göncüoğlu, Sayit, & Tekin, 2010;Norman, 1985;Okay et al, 2006;Rice, Robertson, Ustaömer, İnan, & Taslı, 2009;Robertson et al, 2009;Rojay, 2013;Rojay, Yalınız, & Altıner, 2001;Rolland, Billo, Corsini, Sosson, & Galoyan, 2009;Tekin, Göncüoğlu, & Turhan, 2002).…”

Section: Geological Frameworkmentioning

confidence: 99%

Diverse tectonic settings of formation of the metaigneous rocks in the Jurassic metamorphic accretionary complexes (Refahiye, NE Turkey) and their geodynamic implications

et al. 2013

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Two isolated metamorphic accretionary complexes of Jurassic age, the Refahiye and Kurtlutepe metamorphic rocks, crop out as tectonic slices within the coeval suprasubduction-zone ophiolite at the southern margin of the Eastern Pontides (NE Turkey), close to the İzmir-Ankara-Erzincan suture. The Refahiye metamorphic rocks are made up of greenschist, marble, serpentinite, phyllite and minor garnet amphibolite, garnet micaschist and metachert. The whole unit was metamorphosed under garnet-amphibolite-facies conditions and strongly retrogressed during exhumation. The Kurtlutepe metamorphic rocks consist of subgreenschist-facies metavolcanics, metavolcaniclastics, marble, calc-phyllite, and minor serpentinite and metachert. Metabasites in the Refahiye metamorphic rocks are represented by four distinct geochemical affinities: (i) cumulate "flavor," (ii) alkaline oceanic island basalt (OIB), (iii) enriched mid-ocean ridge basalt (E-MORB) and (iv) tholeiitic island arc basalt (IAB). On the other hand, the Kurtlutepe metavolcanic rocks display only tholeiitic to calc-alkaline island arc geochemical affinities. The metabasic rocks with OIB affinities were interpreted as parts of the accreted oceanic islands, and those with E-MORB affinities as parts of accreted ridge segments close to oceanic islands and/or plume-distal mid-ocean ridges with a mantle previously metasomatized by plume components. The metabasic rocks with IAB affinities might have been derived from the overlying suprasubduction ophiolite and/or arc domain by a number of tectonic or sedimentary processes including tectonic slicing of accretionary complex and overlying fore-arc ophiolite, juxtaposition of the magmatic arc with subduction zone by strike slip faults, submarine gravity sliding and debris flows or subduction erosion. However, totally recrystallized nature of the metabasic rocks together with field relations does not allow any inference on the processes involved. The Kurtlutepe metavolcanic rocks might represent collided and accreted oceanic island arc with the subduction zone. Attempted subduction of an intraoceanic island arc may also explain the magmatic lull during Late Jurassic-Early Cretaceous in the Eastern Pontides.

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Low-grade metamorphic rocks from the Pulur complex, NE Turkey: implications for the pre-Liassic evolution of the Eastern Pontides

Cited by 91 publications

References 76 publications

Devonian magmatism in the western Sakarya Zone, Karacabey region, NW Turkey

Devonian magmatism in the western Sakarya Zone, Karacabey region, NW Turkey

Late Permian Unconformity Around Ankara and New Age Data on the Basement Rocks, Ankara, Turkey

Diverse tectonic settings of formation of the metaigneous rocks in the Jurassic metamorphic accretionary complexes (Refahiye, NE Turkey) and their geodynamic implications

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