ZINC AND LEAD ORE DEPOSIT OF PICHAMTO, NORTH WEST OF SHAHROOD: MINERALOGICAL, FLUID INCLUSION AND ISOTOPIC (C, O, S) STUDIES

Q: How can I download an article?

To download an article from SID, first log in to the site, search for the article title, and click on the 'Download Article' option.

Q: How can I download an ISI article?

To download an ISI article on SID, enter the keyword or article title in the search bar, view the relevant results, click on the desired article, and select the 'Download Article' option.

Q: How can I access the SID database?

To access the SID database, visit SID.ir, create an account, and log in to access scientific resources.

Q: Is downloading articles from SID free?

Some articles on SID are available for free, while others require payment. Details are specified on the article's page.

ABBASI H.; SHAMANIAN ESFAHANI GH.H.; FARDOOST F.

مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

Journal Paper

Paper Information

Journal: GEOSCIENCES Year:2017 | Volume:26 | Issue:104 Page(s): 241-250

Download Full-Text

Persian Verion

View:

743

Download:

Cites:

Information Journal Paper

Title

ZINC AND LEAD ORE DEPOSIT OF PICHAMTO, NORTH WEST OF SHAHROOD: MINERALOGICAL, FLUID INCLUSION AND ISOTOPIC (C, O, S) STUDIES

Author(s)

ABBASI H. | SHAMANIAN ESFAHANI GH.H. | FARDOOST F. | Issue Writer Certificate

Keywords

Not Registered.

Abstract

Lead and zinc mineralization occurs in limestones of the Upper Jurassic Lar Formation at Pichamto, which is located 38 km northwest of Shahroud city in East Alborz structural zone. Lead and zinc mineralization emplaced in host rocks as lens- and vein-shaped bodies due to replacement, and open-space and fracture fillings. Petro graphical and mineralogical studies indicate that smithsonite, calamine, galena, and cerrusite make the main ore minerals, whereas calcite, dolomite, aragonite, iron oxides, quartz and clay minerals are the gangue minerals. Wall-rock alteration includes carbonate recrystallization, dolomitization and brecciation. Fluid inclusion studies indicate two-phase (L+V) liquid- and gas-rich types. Final ice melting temperatures measured in inclusions rage from -19.8 to -8.3 °C. The salinity of fluid inclusions vary between 12 and 22.22 wt.% NaCl equivalent with an average value of 15.41 wt.% NaCl equivalent. Homogenization temperatures for fluid inclusions temperature range between 70 °C and 220 °C, with 176 °C as the average homogenization temperature. The salinity and homogenization temperature ranges for fluid inclusions in the Pichamto deposit suggest that ore-forming fluid derived from basinal brines, similar to hydrothermal solutions in MVT-type Pb-Zn deposits. The δ34S values for two galena samples from Pichamto deposit are+15.6 and+16.2 ‰. These values reveal that the seawater sulfate is the most probable source of sulfur. The reduced sulfur was most likely supplied through thermochemical sulfate reduction. The d13C values of hydrothermal calcite samples are −4.16 ‰ and -9.17 ‰. The d18O values in calcite samples are 2.6 ‰ and 0.8 ‰. The d18O values in calcite overlap with the oxygen isotopic composition of Phanerozoic seawater, indicating possible important participation of Phanerozoic seawater in the ore-forming fluid. The negative d13C values of calcite samples indicate that the organic materials within the host rocks contributed significantly to the hydrothermal fluid. The d13C and d18O values in smithsonite are -7.21 ‰ and -3.41 ‰, respectively. The light carbon isotopic composition of smithsonite reveal the secondary origin of the mineral, and the contribution of meteoric waters and waters containing CO2 derived from decomposition of organic materials in its formation. The Pichamto deposit is comparable to MVT-type Pb-Zn deposits from several points of view including tectonic setting, host rock, wall rock alteration and the source of ore-forming fluids and materials, and have formed during two primary (sulfides formation) and supergene (carbonates and silicates formation) stages.

Cites

No record.

References

No record.

Cite

APA: Copy

ABBASI, H., SHAMANIAN ESFAHANI, GH.H., & FARDOOST, F.. (2017). ZINC AND LEAD ORE DEPOSIT OF PICHAMTO, NORTH WEST OF SHAHROOD: MINERALOGICAL, FLUID INCLUSION AND ISOTOPIC (C, O, S) STUDIES. GEOSCIENCES, 26(104 ), 241-250. SID. https://sid.ir/paper/32676/en

Vancouver: Copy

ABBASI H., SHAMANIAN ESFAHANI GH.H., FARDOOST F.. ZINC AND LEAD ORE DEPOSIT OF PICHAMTO, NORTH WEST OF SHAHROOD: MINERALOGICAL, FLUID INCLUSION AND ISOTOPIC (C, O, S) STUDIES. GEOSCIENCES[Internet]. 2017;26(104 ):241-250. Available from: https://sid.ir/paper/32676/en

IEEE: Copy

H. ABBASI, GH.H. SHAMANIAN ESFAHANI, and F. FARDOOST, “ZINC AND LEAD ORE DEPOSIT OF PICHAMTO, NORTH WEST OF SHAHROOD: MINERALOGICAL, FLUID INCLUSION AND ISOTOPIC (C, O, S) STUDIES,” GEOSCIENCES, vol. 26, no. 104 , pp. 241–250, 2017, [Online]. Available: https://sid.ir/paper/32676/en

Related Journal Papers