Geochemistry, S and Sr isotopes and origin of the Shahneshin barite deposit, NW Kurdistan Province, Iran

Document Type : Research Article

Authors

• Hadi Amin-Rasouli ¹
• Mehdi Moradi ²
• Zahra Sadat Baleshabadi ¹

¹ Department of Earth Sciences, Faculty of Sciences, University of Kurdistan, Sanandaj, Iran

² Geological Survey of Iran West Territory, Sanandaj, Iran

10.22067/econg.2021.51781.85753

Abstract

Introduction
The lenticular Shahneshin barite deposit (N: 35°39'36'' and E: 46°36'11'') is located 80 km  northeast of Marivan, Kurdistan Province; north Sanandaj-Sirjan Zone (Stöcklin, 1968). The deposit consists of stratiform ore and stringer zone. The stringer zone has occurred with alteration sericite- quartz in the footwall dacitic unit (K^v) and evident in a series of vein-veinlets under stratiform ore. The stratiform ore has been located concurrently on the dacite unit and below the Sanandaj Shale unit (Hasankhanloo, 2015).
The study area mainly consists of Mesozoic succession dominated by the dacite tuff, andesitic-basaltic lava and pillow lava (K^v: the host rock), black slate and phyllite (K_s^s: Sanandaj Shale), dolomitic limestone with intercalation of sandstone (K^l), and black shale and slate (K^s: Sanandaj Shale). In this study, samples of the Shahneshin barite deposit have been analyzed for their ⁸⁷Sr/⁸⁶Sr and δ³⁴S isotopes and trace elements (plus REE) geochemistry to assess the source of the deposit.
 
Materials and methods
Forty samples were collected from the Shahneshin barite deposit and country rocks. Polished blocks (6 samples) and thin sections (34 samples) were prepared for SEM images and petrographic examination at the University of Kurdistan. Trace elements (plus REE) were determined by ICP-MS in the Geological Survey center of Iran (Karaj). 
The detection limits for elements are between 0.08-0.6 ppm. Three whole-rock samples for Sr and S isotopes were analyzed at the Department of Earth and Space Sciences of the University of Science and Technology of China.
Sulfur isotope analyses were measured by the use of a Delta V Plus Gas Isotope Ratio Mass Spectrometer. The analysis accuracy was determined to be ±0.2‰ (2σ) by using Canyon Diablo Troilite (CDT) as a standard (³⁴S/³²S=0.0450045). The strontium isotopic composition was completed on a Thermal Ionization Mass Spectrometry instrument by Phoenix. The measured strontium isotope normalized to ⁸⁶Sr/⁸⁸Sr=0.1194 and its NBS-987 standard was 0.7102477±0.000014 (2σ).
 
Results
Strontium isotopes, sulfur isotopes, trace-element (plus REE) composition, fluid inclusion, and petrography of barites help to identify sources of mineral-forming components and environments of precipitation (Baioumy, 2015). The Shahneshin barite deposit includes sulfate barium without valuable Pb and Zn elements. Barite crystals are mainly coarse (>20µ m) with euhedral, tabular, and bladed morphologies. Fluid inclusion microthermometry indicates that the barite formed from low salinity (2.0-8.5 wt.% NaCl eq.) fluids at low temperatures, between 115 to 215^oC (Hasankhanloo, 2015).
Chondrite-normalized REE patterns for the barite samples reflect enrichment of the LREE/HREE ratios, as is shown by the high (Nd/Er)_CN> 11 ratios. They also show Eu/Eu*_CN (0.5-7.0), Ce/Ce*_SN (0.1-1.16), La/Lu*_CN >1, and ratios of the Ce/La (mostly>1), and Eu/Sm (0.1-2.83). The geochemistry of the barite samples represents variation in the abundance of trace elements and REE_CN patterns. The ⁸⁷Sr/⁸⁶Sr and S-isotopic values of Shahneshin barite samples are 0.70649-0.70651 and δ³⁴S=19.05-21.53‰, respectively.
 
Discussion
Barite has very little Rb in its structure, and the isotopic composition of the original Sr is preserved in it (Martin et al., 1995). The ⁸⁷Sr/⁸⁶Sr values of the barite samples are consistent with ⁸⁷Sr/⁸⁶Sr=0.70649-0.70651, which itself is higher than those for host volcanic rocks (0.704-0.705) but lower than that of the Cretaceous seawater (0.7075), the time of barites formation. We may conclude that strontium in the barites is a mixture of predominantly juvenile hydrothermal fluid of low Sr isotope and seawater that contains more radiogenic strontium. δ³⁴S (=19.05-21.53‰) of the samples indicate that much of the sulfur in barite was derived from seawater (δ³⁴S=20-22‰).
Fluid inclusion salinities (Hasankhanloo, 2015), crystal sizes and morphology, abundance of sulfate mineral, lack of valuable Pb and Zn, distribution patterns of trace elements (plus REE) of barite reveal that mixture of magmatic fluid and seawater, with different ratios, were the source of the barite-forming fluid. That is supported by the δ³⁴S values, the location of samples on the Th-U diagram (seawater sources), variations in trace element (plus REEs), and Au anomaly (magmatic sources) in the samples. REEs, La enrichment, variations in abundance of trace elements, as well as δ³⁴S and ⁸⁷Sr/⁸⁶Sr isotope values of the samples are consistent with the Kuroko massive sulfide-type (Marumo, 1989) and submarine hydrothermal volcanic model. In this model, barium has leached from the bedrocks by circulation of reduced hydrothermal fluid and transported along the syn-sedimentary normal faults to the sea-floor. Then, fluid is mixed with SO₄^2- of seawater and it causes the barite to precipitate. These barites have been formed in an open system, on or immediately below the sea-floor.
The Shahneshin barite deposit was, most probably, formed within caldera structures on top of the volcanic complexes in the late-stage of submarine volcanic activity with andesite-dacite in composition. It has occurred at continental margin tectonic setting between subduction zone and passive continental margin due to oblique collision along the Sanandaj-Sirjan Zone in the Late Cretaceous. 

Keywords

• Shahneshin
• Barite
• REEs
• S isotope
• Sr isotope

20.1001.1.20087306.1400.13.4.6.6

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