TY - JOUR

T1 - Stable isotope geochemistry of travertines from northern Urumieh-Dokhtar volcano-plutonic belt, Iran

AU - Zarasvandi, Alireza

AU - Roshanak, Reihaneh

AU - Gratzer, Reinhard

AU - Pourkaseb, Houshang

AU - Moore, Farid

PY - 2017/11/25

Y1 - 2017/11/25

N2 - Abstract In Iran, almost all major travertine deposits withNW–SE trend are exposed in Urumieh-Dokhtar volcanoplutonicbelt. In this study, morphology of travertine,source of CO2, and classification of travertine wereinvestigated using geochemistry of carbon dioxide,stable carbon and oxygen isotopic analysis, SEM imagesand thin sections. Morphology of travertine in the studyarea includes mound and cascade. Stable carbon and oxygenisotope values of the north Urumieh-Dokhtar volcanoplutonicbelt travertines range between 1.46 and 11.71%(VPDB) and - 6.08 and - 10.21% (VPDB), respectively.The high d13C values suggest a contribution of CO2 liberatedby thermometamorphic decarbonation besides itsmagmatic origin. Consequently, these travertines are classifiedas belonging to the thermogene category. A probablereason for the observed high carbon isotope composition inthese deposits may be CO2 consumption as suggested bythe presence of bacteria and diatom activities, verified bySEM images. Pisoid, crystalline crust and pebbly lithofacieswere observed. The stable isotope compositions werecompared to travertines around the world. Similarities inlithofacies and morphology exist between northern Urumieh-Dokhtar volcano-plutonic belt and travertines ofTurkey and Spain. The Iranian travertines are located inareas with volcanic activity. Obviously, the geothermalsystem remained active throughout the late Quaternary topresent.

AB - Abstract In Iran, almost all major travertine deposits withNW–SE trend are exposed in Urumieh-Dokhtar volcanoplutonicbelt. In this study, morphology of travertine,source of CO2, and classification of travertine wereinvestigated using geochemistry of carbon dioxide,stable carbon and oxygen isotopic analysis, SEM imagesand thin sections. Morphology of travertine in the studyarea includes mound and cascade. Stable carbon and oxygenisotope values of the north Urumieh-Dokhtar volcanoplutonicbelt travertines range between 1.46 and 11.71%(VPDB) and - 6.08 and - 10.21% (VPDB), respectively.The high d13C values suggest a contribution of CO2 liberatedby thermometamorphic decarbonation besides itsmagmatic origin. Consequently, these travertines are classifiedas belonging to the thermogene category. A probablereason for the observed high carbon isotope composition inthese deposits may be CO2 consumption as suggested bythe presence of bacteria and diatom activities, verified bySEM images. Pisoid, crystalline crust and pebbly lithofacieswere observed. The stable isotope compositions werecompared to travertines around the world. Similarities inlithofacies and morphology exist between northern Urumieh-Dokhtar volcano-plutonic belt and travertines ofTurkey and Spain. The Iranian travertines are located inareas with volcanic activity. Obviously, the geothermalsystem remained active throughout the late Quaternary topresent.

U2 - 10.1007/s13146-017-0405-y

DO - 10.1007/s13146-017-0405-y

M3 - Article

VL - 34.2019

SP - 869

EP - 881

JO - Carbonates and evaporites

JF - Carbonates and evaporites

SN - 1878-5212

IS - September

ER -