GEOLOGY AND ORIGIN OF ORAS-KUH PB-ZN DEPOSIT IN EASTERN ALBORZ (SEMNAN PROVINCE)

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LOTFI M.; HEKMATIAN M.; SHABANI A.A.; MOKHTARI M.

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Journal: GEOSCIENCES Year:2015 | Volume:24 | Issue:96 Page(s): 73-84

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Title

GEOLOGY AND ORIGIN OF ORAS-KUH PB-ZN DEPOSIT IN EASTERN ALBORZ (SEMNAN PROVINCE)

Author(s)

LOTFI M. | HEKMATIAN M. | SHABANI A.A. | MOKHTARI M. | Issue Writer Certificate

Keywords

ELIKA FORMATIONQ1

MVT DEPOSITQ2

FLUID INCLUSIONQ1

ORAS-KUHQ2

EASTERN ALBORZQ2

Abstract

Oras-kuh lead-zinc deposit is located at about 79 km north-east of Semnan city. This deposit is considered as stratabound and occurs in the upper part of the Triassic dolomitic limestone of the ELIKA FORMATION. ORAS-KUH structure includes a northeast - southwest trending normal anticline and follows the general trend of the EASTERN ALBORZ. Folding in the area has generated three sets of joints including joints trending parallel to the direction of anticline axis, extensional joints perpendicular to anticline axis and the conjugate joint systems. The first two sets of the joints host vein form mineralization. In addition, breccia and karst filling mineralization can be detected. Major minerals are galena, sphalerite and pyrite that altered to secondary minerals such as cerussite, goethite, hydrohetarolite and rosasite under the supergene processes. Gangue minerals are dolomite, calcite, barite, quartz, and small amounts of fluorite. The majority of the temperature data are between 298 to 323oC based on the FLUID INCLUSION geothermometry of calcite and barite minerals. The relatively high temperatures of FLUID INCLUSIONs are attributed most likely to a concealed deep intrusion in the crust inferred by airborne geomagnetic survey. Fluid salinities show a wide range from 0.6 to 15wt% NaCl eq. formed through mixing of basinal brines with meteoritic water. In general based on the present evidences, Oraskuh lead-zinc deposit can be compared with MVT DEPOSITs; however the primary mineralogy and elemental ratios have been changed through secondary supergene processes.

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APA: Copy

LOTFI, M., HEKMATIAN, M., SHABANI, A.A., & MOKHTARI, M.. (2015). GEOLOGY AND ORIGIN OF ORAS-KUH PB-ZN DEPOSIT IN EASTERN ALBORZ (SEMNAN PROVINCE). GEOSCIENCES, 24(96), 73-84. SID. https://sid.ir/paper/32491/en

Vancouver: Copy

LOTFI M., HEKMATIAN M., SHABANI A.A., MOKHTARI M.. GEOLOGY AND ORIGIN OF ORAS-KUH PB-ZN DEPOSIT IN EASTERN ALBORZ (SEMNAN PROVINCE). GEOSCIENCES[Internet]. 2015;24(96):73-84. Available from: https://sid.ir/paper/32491/en

IEEE: Copy

M. LOTFI, M. HEKMATIAN, A.A. SHABANI, and M. MOKHTARI, “GEOLOGY AND ORIGIN OF ORAS-KUH PB-ZN DEPOSIT IN EASTERN ALBORZ (SEMNAN PROVINCE),” GEOSCIENCES, vol. 24, no. 96, pp. 73–84, 2015, [Online]. Available: https://sid.ir/paper/32491/en

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