MINERALOGY AND THE GENESIS OF FISSURE-RIDGE AND VEIN TYPE TRAVERTINE (IN AB-E ASK) BASED ON PETROGRAPHIC STUDIES AND CARBON AND OXYGEN ISOTOPES ANALYSIS

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RAHMANI JAVANMARD S.; TUTTI F.; OMIDIAN S.; RANJBARAN M.

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Journal: Iranian Journal of Geology Year:2012 | Volume:6 | Issue:22 Page(s): 51-61

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Title

MINERALOGY AND THE GENESIS OF FISSURE-RIDGE AND VEIN TYPE TRAVERTINE (IN AB-E ASK) BASED ON PETROGRAPHIC STUDIES AND CARBON AND OXYGEN ISOTOPES ANALYSIS

Author(s)

RAHMANI JAVANMARD S. | TUTTI F. | OMIDIAN S. | RANJBARAN M. | Issue Writer Certificate

Keywords

AB-E ASKQ2

TRAVERTINEQ2

DIATOMSQ2

THERMAL FLUIDSQ2

DEGASSINGQ2

FAULTINGQ2

Abstract

Travertine-bearing hot springs of AB-E ASK are located at the far northeast margin of city of Tehran and at the eastern side of Damavand Volcano. Fissure-ridge and vein-type TRAVERTINE are the main deposit types of these springs. Due to tectonic activities, fault zones and fracture systems were formed and provided migration paths for CO2-bearing hydrothermal fluids. Fissure-ridge and vein-type TRAVERTINE that formed in these zones and systems are resulted from the intense DEGASSING of CO2. Microscopic studies and XRD analyses showed that the fissure-ridge TRAVERTINE is made from nearly pure calcite with some amounts of quartz mineral. This is also supported with SEM and microscopic studies that photosynthetic microorganisms such as blue-green algae and DIATOMS have an important role in the formation of TRAVERTINE. Internal pressure of CO2-bearing hydrothermal fluids resulted in the formation of hydraulic fractures in these rocks. XRD analyses and petrographic studies are also resulted in the recognition of elongated blocky type calcite and other forms of calcite, pyrite, gypsum and a rather few amount of rancieite mineral. Based on stable isotope analyses (including d13C and d18O values), two different origins are recognized for these TRAVERTINEs: fissure-ridge type TRAVERTINEs are related to the de-carbonation of limestone and vein-type ones are related to the magmatic-de-carbonation origin. A considerable enrichment in d13C values is attributed to the de-carbonation of limestone, algal activities and rapid DEGASSING of hot springs.

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گسترش جغرافیایی-استراتیگرافی سنگ های نما و تزئینی ایران

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APA: Copy

RAHMANI JAVANMARD, S., TUTTI, F., OMIDIAN, S., & RANJBARAN, M.. (2012). MINERALOGY AND THE GENESIS OF FISSURE-RIDGE AND VEIN TYPE TRAVERTINE (IN AB-E ASK) BASED ON PETROGRAPHIC STUDIES AND CARBON AND OXYGEN ISOTOPES ANALYSIS. IRANIAN JOURNAL OF GEOLOGY, 6(22), 51-61. SID. https://sid.ir/paper/129267/en

Vancouver: Copy

RAHMANI JAVANMARD S., TUTTI F., OMIDIAN S., RANJBARAN M.. MINERALOGY AND THE GENESIS OF FISSURE-RIDGE AND VEIN TYPE TRAVERTINE (IN AB-E ASK) BASED ON PETROGRAPHIC STUDIES AND CARBON AND OXYGEN ISOTOPES ANALYSIS. IRANIAN JOURNAL OF GEOLOGY[Internet]. 2012;6(22):51-61. Available from: https://sid.ir/paper/129267/en

IEEE: Copy

S. RAHMANI JAVANMARD, F. TUTTI, S. OMIDIAN, and M. RANJBARAN, “MINERALOGY AND THE GENESIS OF FISSURE-RIDGE AND VEIN TYPE TRAVERTINE (IN AB-E ASK) BASED ON PETROGRAPHIC STUDIES AND CARBON AND OXYGEN ISOTOPES ANALYSIS,” IRANIAN JOURNAL OF GEOLOGY, vol. 6, no. 22, pp. 51–61, 2012, [Online]. Available: https://sid.ir/paper/129267/en

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