Origin of the Early-Middle Devonian magmatism in the Sakarya Zone, NW Turkey: Geochronology, geochemistry and isotope systematics

Aysal, Namık; Ustaömer, Tı̇mur; Öngen, Sinan; Keskin, Mehmet; Köksal, Serhat; Peytcheva, Irena; Fanning, Christopher

doi:10.1016/j.jseaes.2011.10.011

Cited by 73 publications

(30 citation statements)

References 51 publications

(64 reference statements)

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“…In the Sr (i) vs. epsilon Nd (i) diagram, all samples plotted into the field between lower continental crust of metaigneous and metapelitic sources ( Figure 13). A similar isotopic distribution was also obtained from Devonian granitoids in other parts of the western Sakarya Zone (see Figure 14, Aysal et al, 2012).…”

Section: Sr-nd Isotope Geochemistrysupporting

confidence: 80%

“…Zindler and Hart (1986) stated different involvements of the mechanisms to generation of EMII but also stated that they always play roles in convergent plate boundaries. Aysal et al (2012) also described Early-Middle Devonian magmatics with similar petrography and geochemistry from farther west; they interpreted their genesis to delamination and/or slab-breakoff but also discussed subduction possibility. Even they show differences in their petrography and some geochemical characteristics, later events are able to change geochemistry of the rocks, especially alteration.…”

Section: The Variscan Magmatism In the Sakarya Zonementioning

confidence: 96%

“…More recently Aysal et al (2012) showed a wider distribution of the Early-Middle Devonian granitoids in the Biga Peninsula in the western Sakarya Zone. No other evidence of Devonian magmatism is known in the Pontides or in Turkey in general, except detrital zircons of Devonian age, reported from the Yusufeli Area (Ustaömer, Robertson, et al, 2012) and from the Late Carboniferous metasediments in the Strandja Massif (Sunal, Natal'in, Satır & Toraman, 2006).…”

Section: The Variscan Magmatism In the Sakarya Zonementioning

confidence: 99%

“…Note that only western samples (KG 07 and 17) have negative Eu anomaly. Shaded area represents distribution of the samples analyzed in Aysal et al (2012). (Jacobsen & Wasserburg, 1980 Zindler and Hart (1986); LM (Lithospheric mantle) is from Yang, Wu, Chung, Wilde, and Chu (2004) and Yang, Wu, Chung, Wilde, and Chu (2006); LCC (1) (lower continental crust of meta-igneous source) and LCC (2) (lower continental crust of meta-pelitic source) are from Villaseca, Downes, Pin, and Barbero (1999).…”

Section: The Variscan Metamorphism In the Sakarya Zonementioning

confidence: 99%

“…This Çamlık Granitoid gave zircon Pb-Pb ages of 399-397 Ma (Okay et al, 1996(Okay et al, , 2006. Aysal et al (2012) showed that some of the other granitoids in the northern part of the Biga Peninsula are also of Devonian age (401-389 Ma) and provided geochemical data showing that they are related to subduction or delamination and/or slab-breakoff models. Here, we show that the Devonian granitoids extend farther east toward Bursa.…”

Section: Introductionmentioning

confidence: 96%

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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: Sr-nd Isotope Geochemistrysupporting

confidence: 80%

Section: The Variscan Magmatism In the Sakarya Zonementioning

confidence: 96%

Section: The Variscan Magmatism In the Sakarya Zonementioning

confidence: 99%

Section: The Variscan Metamorphism In the Sakarya Zonementioning

confidence: 99%

Section: Introductionmentioning

confidence: 96%

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

Sunal

2012

Geodinamica Acta

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A Review of the Geology and Geodynamic Evolution of Tectonic Terranes in Turkey

Göncüoğlu

2019

Modern Approaches in Solid Earth Sciences

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Timing of igneous accretion, composition, and temporal relation of the Kassandra–Sithonia rift-spreading center within the eastern Vardar suture zone, Northern Greece: insights into Jurassic arc/back-arc systems evolution at the Eurasian plate margin

Bonev

Marchev

Moritz

et al. 2015

Int J Earth Sci (Geol Rundsch)

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In the Hellenides of northern Greece, the Kassandra-Sithonia and Central Chalkidiki ophiolites constitute the eastern Vardar suture zone against the Serbo-Macedonian margin of Eurasia. The mafic-intermediate to acid members in the crustal section of the Kassandra-Sithonia ophiolites have N-and E-MORB signatures compatible with an origin in back-arc spreading center. The MORB mantle source has received subduction zone input from nearby Paikon arc system as revealed by LILE and LREE enrichment. A diorite from the Gerakini complex assumed belonging to the Central Chalkidiki ophiolites shows more enriched HFSE and REE pattern relative to MORB and Na-rich character compared to the Kassandra-Sithonia ophiolites. The Sithonia ophiolite crystallization span 159-149 Ma and the Gerakini complex diorite crystallized at 173 Ma as derived from new U-Pb zircon geochronology. Main cluster of Permo-Carboniferous, a small cluster of Neoproterozoic-Cambrian and few Proterozoic, Ordovician, Triassic and Middle Jurassic inherited zircons have provenance from the Serbo-Macedonian margin units. Thus, a Late Jurassic ca.10 Ma lasting igneous accretion of the Kassandra-Sithonia back-arc crust within the eastern Vardar zone is now well-constrained, and corroborated by redefined in age Berriasian-early Valanginian supra-ophiolite cover limestones. Instead affinity to the Central Chalkidiki ophiolites, the Gerakini diorite exhibits chemical similarity to the Chortiatis arc magmatic suite of the Circum-Rhodope belt within the eastern Vardar zone, predates the Sithonia ophiolite in which supplied Middle Jurassic inherited zircons. The Chortiatis arc compared with arc-related Evros ophiolites of the Circum-Rhodope belt in Thrace region shows same 173-160 Ma life span and tectonic setting, implying across north Aegean Sea extension of the arc systems. Based on these new temporal constraints a tectonic scenario of Jurassic subduction settings and arc/back-arc systems development in the Maliac/Meliata-Vardar oceanic basins is proposed that also accounts for continental magmatism in the Serbo-Macedonian margin of Eurasia

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Origin of the Early-Middle Devonian magmatism in the Sakarya Zone, NW Turkey: Geochronology, geochemistry and isotope systematics

Cited by 73 publications

References 51 publications

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

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

A Review of the Geology and Geodynamic Evolution of Tectonic Terranes in Turkey

Timing of igneous accretion, composition, and temporal relation of the Kassandra–Sithonia rift-spreading center within the eastern Vardar suture zone, Northern Greece: insights into Jurassic arc/back-arc systems evolution at the Eurasian plate margin

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