Pale environment modeling using carbon and oxygen stable isotopes in cement and pedogenic carbonates (Case study: Saqqez river basin)
Subject Areas :Zahra HashemiDehaghi 1 , bahareh osanlou 2 , 3
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Keywords: Pedogenic Carbonate, Stable Isotope, C3 and C4 Vegetation, Saghez river basin.,
Abstract :
have been used as an important tool in paleoenvironment indices reconstruction including temperature, effective precipitation and atmospheric carbonate gas concentration during carbonate formation and determining vegetation history and geomorphic processes. In view of this, 16 samples including eight samples of paleosols horizon pedogenic carbonate and eight samples of river conglomerate carbonate cements were collected to measure of carbon and oxygen stable isotope composites. The low values of δ18O showed that the air temperature during carbonates formation was 7.9 ˚C which was cooler ca. 5.5 ˚C compared to current air temperature. The δ13C value during formation of pedogenic carbonates and soil profile evolution showed that C4 vegetation is dominated that means the ecosystems with C4 dominate vegetation have growth period in warm season and considerable moisture stress. The correlation between δ18O and δ13C values was higher in pedogenic carbonates demonstrating precipitation water and CO2 in soil (vegetation reparation ratio) are main controlling factor of these values however, in cement carbonates as well as precipitation water and CO2, groundwater, organism and primary carbonates sources could be affected carbon isotope values.
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