Evolution of the Triassic continental margin, northwest Anatolia

Genç, Ş. Can; Yïlmaz, Yücel

doi:10.1016/0040-1951(94)00198-i

Cited by 63 publications

(26 citation statements)

References 18 publications

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“…This major uplift and erosional phase was followed by extensive Late Oligocene to Middle Miocene calc-alkaline magmatism. Granodioritic plutons and andesitic-dacitic volcanic rocks developed during the Eocene continuing with Oligocene granites, granodiorites, syenites and early Miocene rhyolites, dacites and calc-alkaline andesites [24][25][26][27]. In the Thrace basin and the Biga…”

Section: Regional Geologymentioning

confidence: 99%

Fluid processes in the Tesbihdere base-metal-Au deposit: Implications for epithermal mineralization in the Biga Peninsula, NW Turkey

et al. 2014

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Abstract:Tesbihdere is one of a number of spatially close epithermal Cu-Pb-Zn-Ag-Au deposits hosted by andesites and rhyolites, typical of deposits in the Biga peninsula. Microthermometry of fluid inclusions shows a wide range of temperatures, ∼360-170 • C, and salinities, ∼10-0.5 wt.% NaCl, in the different deposits studied. Dilution of a moderately saline magmatic? fluid with meteoric water occurred at constant temperature indicating, the temperature of both fluids was controlled by the geological environment. Boiling was not a major factor, but did occur in very minor amounts. The large range of temperatures within individual samples can only reasonably be explained by variations from near lithostatic to hydrostatic pressure during vein and fracture opening. That this pressure decrease did not produce extensive boiling suggests that vein opening was gradual rather than aggressive, allowing the pressure and temperature decrease to follow a path close to the L-V boiling curve. P-T reconstruction places emplacement of these ore veins at between 300-500 m beneath the surface. Similarities of LA-ICPMS of fluid inclusions from Tesbihdere, Azitepe and Basmakci, supports the conclusion that they were part of the same contemporaneous mineralizing system. The fluids are dominated by Na, with the concentrations of K>Ca>Mg combined equivalent to the concentration of Na. The range of K/Na ratios is not consistent with the fluid inclusion temperatures as the calculated temperatures are significantly higher indicating the fluids were not close to equilibrium with the enclosing rocks.

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Section: Regional Geologymentioning

confidence: 99%

Fluid processes in the Tesbihdere base-metal-Au deposit: Implications for epithermal mineralization in the Biga Peninsula, NW Turkey

et al. 2014

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“…The Karakaya and Hisarlıkaya Formations are roughly similar and comprise Carboniferous, Permian and Triassic limestone blocks cemented by Middle Triassic clastics. Consequently the Karakaya and Hisarlıkaya formations are incorrectly considered as different slices of the same unit and interpreted either as the fragments of the Triassic Karakaya Ocean (Şengör & Yılmaz 1981;Koçyiğit 1987;Genç & Yılmaz 1995;Göncüoğlu et al 2000) or as a subduction-accretion complex related to the northward subduction of the Palaeotethyan oceanic lithosphere (Tekeli 1981;Picket & Robertson 1996;Okay 2000;Okay & Göncüoğlu 2004).…”

Section: Discussion and Geodynamical Evolutionmentioning

confidence: 99%

The Ankara Mélange: an indicator of Tethyan evolution of Anatolia

Çakir¹,

Üner²

2016

Geologica Carpathica

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“…The Istanbul Zone is dominated by passive margin type Ordovician-Carboniferous-sedimentary successions, which were unconformably covered by Triassic and younger units (Görür, et al 1997). On the contrary, the Sakarya Zone was formed by Permo-Triassic subduction-accretion complexes and unconformably covered by Triassic and younger sediments (Genç & Yilmaz, 1995;Goncuoglu, Turhan, & Tekin, 2003;Okay & Tüysüz, 1999;Tekeli, 1981).…”

Section: Regional Geology and Geological Settingmentioning

confidence: 99%

Subduction-related Late Cretaceous high-K volcanism in the Central Pontides orogenic belt: constraints on geodynamic implications

Aydınçakır

2016

Geodinamica Acta

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Mineral chemistry, major and trace elements, 40 Ar/ 39 Ar age and Sr-Nd-Pb isotopic data are presented for the Late Cretaceous Hamsilos volcanic rocks in the Central Pontides, Turkey. The Hamsilos volcanic rocks mainly consist of basalt, andesite and associated pyroclastics (volcanic breccia, vitric tuff and crystal tuff). They display shoshonitic and high-K calc-alkaline affinities. The shoshonitic rocks contain plagioclase, clinopyroxene, alkali feldspar, phlogopite, analcime, sanidine, olivine, apatite and titanomagnetite, whereas the high-K calc-alkaline rocks contain plagioclase, clinopyroxene, orthopyroxene, magnetite / titanomagnetite in microgranular porphyritic, hyalo-microlitic porphyritic and glomeroporphyritic matrix. Mineral chemistry data reveal that the pressure condition of the clinopyroxene crystallisation for the shoshonitic rocks are between 1.4 and 6.3 kbar corresponds to 6-18-km depth and the high-K calc-alkaline rocks are between 5 and 12 km. 40 Ar/ 39 Ar age data changing between 72 ± .5 Ma and 79.0 ± .3 Ma (Campanian) were determined for the Late Cretaceous Hamsilos volcanic rocks, contemporaneous with the subduction of the Neo-Tethyan Ocean beneath the Pontides. The studied volcanic rocks were enriched in the large-ion lithophile and light rare earth element contents, with pronounced depletion in the contents of high-field-strength elements. Chondrite-normalised rare earth element patterns (La N /Lu N = 6-17) show low to medium enrichment, indicating similar sources of the rock suite. Pb/ 204 Pb values between 37.839 and 38.427. The main solidification processes involved in the evolution of the volcanic rocks consist of fractional crystallisation, with minor amounts of crustal contamination ± magma mixing. According to geochemical evidence, the shoshonitic melts in the Hamsilos volcanic rocks were possibly derived from the low degree of partial melting of a subcontinental lithospheric mantle (SCLM), while the high-K calc-alkaline melts were derived from relatively high degree of partial melting of SCLM that was enriched by fluids and/or sediments from a subduction of oceanic crust.

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Evolution of the Triassic continental margin, northwest Anatolia

Cited by 63 publications

References 18 publications

Fluid processes in the Tesbihdere base-metal-Au deposit: Implications for epithermal mineralization in the Biga Peninsula, NW Turkey

Fluid processes in the Tesbihdere base-metal-Au deposit: Implications for epithermal mineralization in the Biga Peninsula, NW Turkey

The Ankara Mélange: an indicator of Tethyan evolution of Anatolia

Subduction-related Late Cretaceous high-K volcanism in the Central Pontides orogenic belt: constraints on geodynamic implications

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