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Fluids along the North Anatolian Fault, Niksar basin, north central Turkey: Insight from stable isotopic and geochemical analysis of calcite veins
Date
2017-08-01
Author
Sturrock, Colin P.
Catlos, Elizabeth J.
Miller, Nathan R.
AKGÜN, AYKUT
Fall, Andras
Gabitov, Rinat I.
Yılmaz, İsmail Ömer
Larson, Toti
Black, Karen N.
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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.
Subject Keywords
Fractures
,
Fluid flow
,
Trace elements
,
North Anatolian Fault
,
Stable isotopes;
,
Tectonic veins
URI
https://hdl.handle.net/11511/36984
Journal
JOURNAL OF STRUCTURAL GEOLOGY
DOI
https://doi.org/10.1016/j.jsg.2017.06.004
Collections
Department of Geological Engineering, Article
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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.