Thermometry and origin of the mineralizing fluid at Barika gold deposit, East of Sardasht

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TAJEDDIN H.A.; RASTAD E.; Yaghoubpour a.; MOHAJJEL M.; Goldfarb r.

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Journal: GEOSCIENCES Year:2019 | Volume:28 | Issue:111 Page(s): 17-28

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Title

Thermometry and origin of the mineralizing fluid at Barika gold deposit, East of Sardasht

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Keywords

VMS depositQ1

Fluid inclusionQ1

Sulfur isotopeQ1

BarikaQ2

SardashtQ1

Abstract

Barika gold (and silver)-rich volcanogenic massive sulfide deposit is located 18 km east of Sardasht in the northwestern Sanandaj– Sirjan metamorphic zone. The rocks in the vicinity of the Barika deposit predominantly consist of Cretaceous volcano-sedimentary sequences of phyllite, slate, andesite and tuffite, metamorphosed under greenschist facies grade. The Barika deposit is composed of stratiform ore and stringer zone which both are hosted in an altered and sheared meta-andesite unit. The stratiform ore, approximately 150 m long and up to 20 m thick consists of sulfide and barite ores associated with lesser amounts of silica bands. Fluid inclusion studies indicate that quartz (stringer zone) and barite (stratiform ore) samples homogenized between 146° C to 283° C and 132° to 223° C, respectively. Salinities of the Fluid inclusions show a range from 1. 4 to 9. 6 wt. % NaCl equivalent which are close to that of normal seawater. The study indicates that cooling occurred in the initial ore fluids, as a result of mixing with seawater, as an important process in the formation of the Barika deposit. The δ 34S values of sulfide minerals (pyrite, sphalerite and galena) from stockwork mineralization in the Barika deposit range from-0. 8 to +5. 6 per mil and fall within the range of values observed for volcanogenic massive sulfide deposits. The narrow range of measured δ 34S values from the sulfide minerals suggests that similar to most Kuroko VMS deposits, the ore-forming sulfur derived from leaching of igneous sulfur from the underlying andesitic rocks. Calculated Sulfur isotope temperatures for twelve coexisting galena-sphalerite and galena-pyrite pairs range from 146 to 293° C which is consistent with temperatures estimated from Fluid inclusion studies.

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APA: Copy

TAJEDDIN, H.A., RASTAD, E., Yaghoubpour, a., MOHAJJEL, M., & Goldfarb, r.. (2019). Thermometry and origin of the mineralizing fluid at Barika gold deposit, East of Sardasht. GEOSCIENCES, 28(111 ), 17-28. SID. https://sid.ir/paper/32201/en

Vancouver: Copy

TAJEDDIN H.A., RASTAD E., Yaghoubpour a., MOHAJJEL M., Goldfarb r.. Thermometry and origin of the mineralizing fluid at Barika gold deposit, East of Sardasht. GEOSCIENCES[Internet]. 2019;28(111 ):17-28. Available from: https://sid.ir/paper/32201/en

IEEE: Copy

H.A. TAJEDDIN, E. RASTAD, a. Yaghoubpour, M. MOHAJJEL, and r. Goldfarb, “Thermometry and origin of the mineralizing fluid at Barika gold deposit, East of Sardasht,” GEOSCIENCES, vol. 28, no. 111 , pp. 17–28, 2019, [Online]. Available: https://sid.ir/paper/32201/en

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