GEOCHEMICAL ASPECTS OF CHAHREESEH BENTONITE DEPOSIT, NORTHEAST OF ISFAHAN, CENTRAL IRAN STRUCTURAL ZONE

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FATAHI SH.; CALAGARI A.A.; ABEDINI A.; BAGHERI H.

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Journal: GEOSCIENCES Year:2015 | Volume:24 | Issue:95 (PETROLOGY & MINERALOGY) Page(s): 287-296

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Title

GEOCHEMICAL ASPECTS OF CHAHREESEH BENTONITE DEPOSIT, NORTHEAST OF ISFAHAN, CENTRAL IRAN STRUCTURAL ZONE

Author(s)

FATAHI SH. | CALAGARI A.A. | ABEDINI A. | BAGHERI H. | Issue Writer Certificate

Keywords

BENTONITEQ2

ALTERATIONQ2

TUFF BRECCIAQ2

MASS CHANGESQ2

CHAHREESEHQ2

ISFEHANQ2

Abstract

Chahreeseh BENTONITE deposit is located at ~55 km northeast of Isfahan, structural zone of Central Iran. This deposit has layered and massive form and includes six discrete outcrops. The field observations showed that the ores are genetically related to Oligo-Miocene TUFF BRECCIA. The mineralogical studies testified to the presence of minerals such as montmorillonite, saponite, beidellite, cristobalite, anorthite, calcite, dolomite, albite, vermiculite, actinolite, pyrophyllite, quartz, sanidine nontronite, orthoclase, microcline, tridymite, and hematite in rock-forming quantities in the bentonitic samples. Based on the minerals chemistry considerations, the CHAHREESEH BENTONITE deposit can be classified as the Wyoming type. The results of mass change calculations (with assumption of Hf as low-mobile index element) show that progression of bentonitization process at CHAHREESEH was accompanied by depletion of elements like Al, Fe, K, Ti, Mn, P, Ba, Co, Zn, Cs, Rb, Y, Zr, Ni, Sr, and Cu, enrichment of U, and leaching-fixation of elements such as Na, Mg, Ca, and Si. The geochemical interpretations revealed that variations of Eu negative anomaly (0.27-0.90) and weak negative to weak positive anomalies of Ce (0.97-1.22) at CHAHREESEH have been controlled by the degree of feldspar ALTERATION and changes in the rate of oxidation potential of the environment, respectively. By considering the results obtained from field relations, mineralogy and geochemistry, it seems factors such as physico-chemical conditions of ALTERATION environment, absorption mechanism, difference in degree of ALTERATION intensity of parent materials, the degree of access to fluoride, chloride, and sulfate ligands, incorporation in crystal structure, ionic exchange, physical concentration, and the presence in resistant mineral phases played significant roles in distribution and concentration of elements in this deposit, respectively.

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APA: Copy

FATAHI, SH., CALAGARI, A.A., ABEDINI, A., & BAGHERI, H.. (2015). GEOCHEMICAL ASPECTS OF CHAHREESEH BENTONITE DEPOSIT, NORTHEAST OF ISFAHAN, CENTRAL IRAN STRUCTURAL ZONE. GEOSCIENCES, 24(95 (PETROLOGY & MINERALOGY)), 287-296. SID. https://sid.ir/paper/31731/en

Vancouver: Copy

FATAHI SH., CALAGARI A.A., ABEDINI A., BAGHERI H.. GEOCHEMICAL ASPECTS OF CHAHREESEH BENTONITE DEPOSIT, NORTHEAST OF ISFAHAN, CENTRAL IRAN STRUCTURAL ZONE. GEOSCIENCES[Internet]. 2015;24(95 (PETROLOGY & MINERALOGY)):287-296. Available from: https://sid.ir/paper/31731/en

IEEE: Copy

SH. FATAHI, A.A. CALAGARI, A. ABEDINI, and H. BAGHERI, “GEOCHEMICAL ASPECTS OF CHAHREESEH BENTONITE DEPOSIT, NORTHEAST OF ISFAHAN, CENTRAL IRAN STRUCTURAL ZONE,” GEOSCIENCES, vol. 24, no. 95 (PETROLOGY & MINERALOGY), pp. 287–296, 2015, [Online]. Available: https://sid.ir/paper/31731/en

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