Fluids along the North Anatolian Fault, Niksar basin, north central Turkey: Insight from stable isotopic and geochemical analysis of calcite veins

Sturrock, Colin P.
Catlos, Elizabeth J.
Miller, Nathan R.
Fall, Andras
Gabitov, Rinat I.
Yılmaz, İsmail Ömer
Larson, Toti
Black, Karen N.
Six limestone assemblages along the North Anatolian Fault (NAF) Niksar pull-apart basin in northern Turkey were analyzed for delta O-18(PDB) and delta C-13(PDB) using bulk isotope ratio mass spectrometry (IRMS). Matrix vein differences in delta O-18(PDB) (-2.1 to 6.3 parts per thousand) and delta C-13(PDB) (-0.9 to 4.6 parts per thousand) suggest a closed fluid system and rock buffering. Veins in one travertine and two limestone assemblages were further subjected to cathodoluminescence, trace element (Laser Ablation Inductively Coupled Plasma Mass Spectrometry) and delta O-18(PDB) (Secondary Ion Mass Spectrometry, SIMS) analyses. Fluid inclusions in one limestone sample yield T-h of 83.8 +/- 7.3 degrees C (+/- 1 sigma, mean average). SIMS delta O-18(PDB) values across veins show fine-scale variations interpreted as evolving thermal conditions during growth and limited rock buffering seen at a higher resolution than IRMS. Rare earth element data suggest calcite veins precipitated from seawater, whereas the travertine has a hydrothermal source. The delta O-18(SMOW-fluid) for the mineralizing fluid that reproduces T-h is +2 parts per thousand, in range of Cretaceous brines, as opposed to negative delta O-18(SMOW-fluid) from meteoric, groundwater, and geothermal sites in the region and highly positive delta O-18(SMOW-fluid) expected for mantle-derived fluids. Calcite veins at this location do not record evidence for deeply-sourced metamorphic and magmatic fluids, an observation that differs from what is reported for the NAF elsewhere along strike.


Cross-sectional anatomy and geodynamic evolution of the Central Pontide orogenic belt (northern Turkey)
Hippolyte, JC; Espurt, Nikolas; Kaymakcı, Nuretdin; SANĞU, ERCAN; Mueller, C. (2016-01-01)
Geophysical data allowed the construction of a similar to 250-km-long lithospheric-scale balanced cross section of the southern Black Sea margin (Espurt et al. in Lithosphere 6:26-34, 2014). In this paper, we combine structural field data, stratigraphic data, and fault kinematics analyses with the 70-km-long onshore part of the section to reconstruct the geodynamic evolution of the Central Pontide orogen. These data reveal new aspects of the structural evolution of the Pontides since the Early Cretaceous. T...
Helium isotope variations in Turkey: relationship to tectonics, volcanism and recent seismic activities
Güleç, Nilgün Türkan; Mutlu, H (2002-07-01)
The distribution of helium isotope ratios in the various tectonic provinces of Turkey is examined through a synthesis of previously published data and the results of a recent survey along the North Anatolian Fault Zone (NAFZ) following the catastrophic 1999 earthquakes. The R/R-A values (where R = sample He-3/He-4 and RA = air He-3/He-4) cover a wide range from 0.05 to 7.87, and the mantle-derived helium is clearly identified in most locations, The mantle-derived component is high (> 50% of total He) in (a)...
Source components and magmatic processes in the genesis of Miocene to Quaternary lavas in western Turkey: constraints from HSE distribution and Hf-Pb-Os isotopes
Aldanmaz, Ercan; Pickard, Megan; Meisel, Thomas; Altunkaynak, Şafak; Sayıt, Kaan; Sen, Pinar; Hanan, Barry B.; Furman, Tanya (Springer Science and Business Media LLC, 2015-08-01)
Hf-Pb-Os isotope compositions and highly siderophile element (HSE) abundance variations are used to evaluate the mantle source characteristics and possible effects of differentiation processes in lavas from western Turkey, where the eruption of Late Miocene to Quaternary OIB-type intraplate mafic alkaline lavas followed pre-Middle Miocene convergent margin-type volcanism. Concentrations of Os, Ir, and Ru (IPGE) in the OIB-type intraplate lavas decrease with fractionation for primitive melts (MgO > 10 wt%), ...
Late Miocene transcurrent tectonics in NW Turkey: evidence from palaeomagnetism and 40Ar–39Ar dating of alkaline volcanic rocks
KAYMAKCI, N.; Kaymakcı, Nuretdin; LANGEREIS, C.; SPELL, T. L.; GURER, O. F.; ZANETTI, K. A. (Cambridge University Press (CUP), 2007-2-9)
<jats:p>A number of intra-continental alkaline volcanic sequences in NW Turkey were emplaced along localized extensional gaps within dextral strike-slip fault zones prior to the initiation of the North Anatolian Fault Zone. This study presents new palaeomagnetic and <jats:sup>40</jats:sup>Ar–<jats:sup>39</jats:sup>Ar geochronological results from the lava flows of NW Turkey as a contribution towards understanding the Neogene–Quaternary tectonic evolution of the region and possible roles of block rotations i...
Fracture/cleat analysis of coals from Zonguldak Basin (northwestern Turkey) relative to the potential of coalbed methane production
Karacan, CO; Okandan, E (2000-08-01)
In this study, the fracture structure of three coals (Sulu K-1, Acihk K-2 and Cay Dogu Ayak) from two different seams in the Zonguldak Basin located on the Black Sea coast of Turkey have been analyzed in relation to coalbed methane recovery. X-ray computerized tomography (CT), light microscopy image analysis and scanning electron microscopy (SEM) analysis have been performed on mine coal samples to have a better understanding of distribution of minerals, fracture morphology and apertures and matrix/fracture...
Citation Formats
C. P. Sturrock et al., “Fluids along the North Anatolian Fault, Niksar basin, north central Turkey: Insight from stable isotopic and geochemical analysis of calcite veins,” JOURNAL OF STRUCTURAL GEOLOGY, pp. 58–79, 2017, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/36984.