Mineralogic and geochemical characteristics of late quaternary veins from Anamur-Gazipaşa fault zones (S Turkey)

Ünal İmer, Ezgi
Uysal, Tonguç
Dirik, Ramazan Kadir
Ring, Uwe
İmer, Ali
Mutlu, Halim
Temel, Abidin
Widespread vein-type carbonate (e.g., travertine) occurrences developed along active fault systems during the late Quaternary period in Turkey, a region of known active tectonism. This study presents preliminary high precision U-series and geochemical data on hypogenic fluids migrated and precipitated as carbonate veins along fractures developed in NNW-SSE trending active fault zones in S Anatolia (Ören-Anamur and Gazipaşa). U-series dates of fault-related carbonate (mainly as calcite) vein and fault plane calcite slickened fibers collected from the study areas range between >500 ka and 5.6 ka. Anamur vein samples formed between 132±2 ka and 5.6±0.4 ka, whereas ages of Gazipaşa samples vary between 530±63 ka and 30.0±2.1. Petrographic and XRD analyses revealed that the samples contain medium- to coarse-grained, equigranular, and elongated columnar calcite crystals. In some samples, calcite growth zones are identified with micrite and small groups of inclusion trails aligned perpendicular to the growth axes. According to the stable isotope analyses, the δ13C values of the fault calcite from Anamur region range between -12 and -6‰ (VPDB), and Gazipaşa samples have similar δ13C values between -12 and -7‰ (VPDB). Carbonate δ18O isotope values of Anamur and Gazipaşa regions are almost identical (Anamur: -7 – -4‰, Gazipaşa: -7 – -3‰; VPDB). Mean 87Sr/86Sr ratios of Gazipaşa samples are higher than those of both Anamur vein samples (mean=~0.708) and Permian limestone wall rock (mean=~0.707). This mean value correlates well with the mean 87Sr/86Sr ratios of modern and Cenozoic seawater (~0.709). In addition, 87Sr/86Sr values of Permian limestone wall rock samples are similar to that of Permian seawater (~0.707). A primary seawater source for calcite vein deposits is also evident in PAAS-normalized rare earth element-Yttrium diagrams, where vein samples display negative Ce and positive Y anomalies. The comparison of the project`s results with other travertine and calcite vein deposits in Turkey and the Eastern Meditarranean and the interpretation in terms of regional tectonic and climatological dynamics are still continued
71. Türkiye Jeoloji Kurultay (23 - 27 Nisan 2018)


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Citation Formats
E. Ünal İmer et al., “Mineralogic and geochemical characteristics of late quaternary veins from Anamur-Gazipaşa fault zones (S Turkey) ,” 2018, p. 435, Accessed: 00, 2021. [Online]. Available: https://www.jmo.org.tr/resimler/ekler/18075bc3ddfdc43_ek.pdf.