GENESIS OF SB-AS-AU DEPOSIT IN VOLCANO-PLAUTONIC COMPLEX OF DASH-KASAN (EAST QORVEH, KORDESTAN PROVINCE)

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RASTAD E.; NIROUMAND SH.A.D.; EMAMI MOHAMMAD HASHEM; RASHIDNEZHAD OMRAN N.A.

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Journal: GEOSCIENCES Year:621 | Volume: | Issue: Page(s): 2-23

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Title

GENESIS OF SB-AS-AU DEPOSIT IN VOLCANO-PLAUTONIC COMPLEX OF DASH-KASAN (EAST QORVEH, KORDESTAN PROVINCE)

Author(s)

RASTAD E. | NIROUMAND SH.A.D. | EMAMI MOHAMMAD HASHEM | RASHIDNEZHAD OMRAN N.A. | Issue Writer Certificate

Keywords

ANTIMONY-ARSENIC- GOLD

VOLCANO- PLUTONIC COMPLEX

DACITIC- RHYODACITIC DOMES

ALTERATION ZONES

EPITHERMAL ACID- SULFATE TYPE

DASH-KASAN(QORVEH)

Abstract

Dashkasan antimony-arsenic-gold deposit is located in west Iran, 42 km NE of Qorveh (Kordestan provice). The area is a p'art of Sanandaj- Sirjan magmatic-metamorphic zone. Based on geological observations, the oldest rock units in the area belong to the Jurassic serie and are slates, phyllites and quartzites. The youngest units are Neogene volcano-clastic conglomerates, basaltic flows, block lavas and Quaternary agglomerates. The plutonic rocks in the area consist of a Neogene (Pliocene?) calc-alkaline microgranite-microgranodiorite intrusive with microgranular porphyritictextures. The sub volcanic equivalent of these plutonic rocks, is represented as Agh Dagh and Sari Dagh dacite-rhyodacite domes Dashkasan mine is considered as a vein-type deposit in which its related mineralization is controlled by tectonic structures. The deposit is hosted by dacite, rhyodacite and microgranodiorite sub volcanic rocks which are mainly associated with silicic, argillic, and pyritic alterations. The ore parageneses in the veins includes quartz, stibnite, pyrite, realgar, orpiment, pyrrhotit, chalcopyrite, bornite, galena, boulangerite, aurostibite (?), gold, stibiconite, kermesite and iron-hydroxide. The Gold content of the veins ranges between 55 and 266ppm, whereas in sulfide-silicic zone, it ranges from 10 to 18 ppm. Gold grains are between 10 and 150 microns in diameter commonly occurring with quartz and in smaller sizes within the oxidized pyrites. Scanning Electron Microprobe (SEM) studies display quantities of Sb, Ag and Hg within the gold grains. The analytical results for samples from six litho geochemical profiles vertically cutting the main stibnite veins in Agh Dagh and Sari Dagh areas indicate that high-grade gold is limited to stibnite veins and also to silicic-pyritic ALTERATION ZONES. Fluid inclusion studies reveal that homogenization temperatures range between 183 C and 255 C and salinity from 8.9 to 18.8 wt % NaCl equivalent. Field observations and laboratory studies show a close relationship between the antimony-arsenic-gold mineralization, and silicic solutions drived from sub volcanic body in the area. It is therefore suggested that, the mineralization belongs to epithermal group and acid-sulfate type.

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APA: Copy

RASTAD, E., NIROUMAND, SH.A.D., EMAMI, MOHAMMAD HASHEM, & RASHIDNEZHAD OMRAN, N.A.. (2001). GENESIS OF SB-AS-AU DEPOSIT IN VOLCANO-PLAUTONIC COMPLEX OF DASH-KASAN (EAST QORVEH, KORDESTAN PROVINCE). GEOSCIENCES, 9(37-38), 2-23. SID. https://sid.ir/paper/555066/en

Vancouver: Copy

RASTAD E., NIROUMAND SH.A.D., EMAMI MOHAMMAD HASHEM, RASHIDNEZHAD OMRAN N.A.. GENESIS OF SB-AS-AU DEPOSIT IN VOLCANO-PLAUTONIC COMPLEX OF DASH-KASAN (EAST QORVEH, KORDESTAN PROVINCE). GEOSCIENCES[Internet]. 2001;9(37-38):2-23. Available from: https://sid.ir/paper/555066/en

IEEE: Copy

E. RASTAD, SH.A.D. NIROUMAND, MOHAMMAD HASHEM EMAMI, and N.A. RASHIDNEZHAD OMRAN, “GENESIS OF SB-AS-AU DEPOSIT IN VOLCANO-PLAUTONIC COMPLEX OF DASH-KASAN (EAST QORVEH, KORDESTAN PROVINCE),” GEOSCIENCES, vol. 9, no. 37-38, pp. 2–23, 2001, [Online]. Available: https://sid.ir/paper/555066/en

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