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Makale Detayları

[Türkçe .pdf]
Geochemistry of Miocene evaporites from the Aşkale region (Erzurum, Eastern Turkey): constraints for paleo-environment
Başlık: Geochemistry of Miocene evaporites from the Aşkale region (Erzurum, Eastern Turkey): constraints for paleo-environment
Yazarlar: Emel ABDİOĞLU YAZAR, Mehmet ARSLAN, Cahit HELVACı, İbrahim GüNDOğAN, İrfan TEMZEL, Didem AYDıNçAKıR
Anahtar Kelimeler: evaporite, gypsum, anhydrite, geochemistry, Aşkale, Turkey
Özet:

The Aşkale sub-basin hosts Early Miocene evaporites intercalated with clastic sediments and carbonates. Gypsum- and anhydrite-rich evaporite samples are characterized by high CaO and SO4 contents, and low Na2O, K2O, MgO, and B contents. The Sr contents are 228–6,464 ppm in evaporite samples, 169–631 ppm in claystone, 181–60,090 ppm in marl, and 15,150 ppm in limestone. All the samples are also characterized by enrichment in light rare earth elements (REE) (LaN/LuN = 0.867–4.243) and have variable CeN/Ce* (0.389–2.245) ratios. Measured EuN/Eu* values of the samples display strong and variable negative and positive anomalies. δ34S and δ18O values of gypsum- and anhydrite samples have wide ranges from 22.3 ‰ to 25.62 ‰, and 12.1 ‰ to 18.0 ‰, respectively. Most of these values are heavier than expected Miocene marine gypsum composition and may be resulted from reduction and oxidation reactions of sulfide species in brines. 87Sr/86Sr ratios range from 0.707475 (ΔSW = −169.8) to 0.708174 (ΔSW = −99.9), close to and/or slightly lower than an Early-Miocene marine isotopic composition. Petrochemical and isotopic data indicate that the Aşkale basin evaporites developed in subtropical conditions via multiple marine transgressions onto a shallow platform or lagoonal environment.

10.19111/bulletinofmre.772360

Details

[English .pdf]
Geochemistry of Miocene evaporites from the Aşkale region (Erzurum, Eastern Turkey): constraints for paleo-environment
Title: Geochemistry of Miocene evaporites from the Aşkale region (Erzurum, Eastern Turkey): constraints for paleo-environment
Authors: Emel ABDİOĞLU YAZAR, Mehmet ARSLAN, Cahit HELVACı, İbrahim GüNDOğAN, İrfan TEMZEL, Didem AYDıNçAKıR
Keywords: evaporite, gypsum, anhydrite, geochemistry, Aşkale, Turkey
Abstract:

The Aşkale sub-basin hosts Early Miocene evaporites intercalated with clastic sediments and carbonates. Gypsum- and anhydrite-rich evaporite samples are characterized by high CaO and SO4 contents, and low Na2O, K2O, MgO, and B contents. The Sr contents are 228–6,464 ppm in evaporite samples, 169–631 ppm in claystone, 181–60,090 ppm in marl, and 15,150 ppm in limestone. All the samples are also characterized by enrichment in light rare earth elements (REE) (LaN/LuN = 0.867–4.243) and have variable CeN/Ce* (0.389–2.245) ratios. Measured EuN/Eu* values of the samples display strong and variable negative and positive anomalies. δ34S and δ18O values of gypsum- and anhydrite samples have wide ranges from 22.3 ‰ to 25.62 ‰, and 12.1 ‰ to 18.0 ‰, respectively. Most of these values are heavier than expected Miocene marine gypsum composition and may be resulted from reduction and oxidation reactions of sulfide species in brines. 87Sr/86Sr ratios range from 0.707475 (ΔSW = −169.8) to 0.708174 (ΔSW = −99.9), close to and/or slightly lower than an Early-Miocene marine isotopic composition. Petrochemical and isotopic data indicate that the Aşkale basin evaporites developed in subtropical conditions via multiple marine transgressions onto a shallow platform or lagoonal environment.

10.19111/bulletinofmre.772360


 
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