MINERALOGY AND REE GEOCHEMISTRY AT GOMISH-TAPPEH ZN-PB-CU (AG) DEPOSIT, SOUTHWEST OF ZANJAN

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SALEHI T.; GHADERI M.; RASHIDNEJAD OMRAN N.

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Journal: JOURNAL OF ECONOMIC GEOLOGY Year:2011 | Volume:2 | Issue:2 Page(s): 235-254

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Title

MINERALOGY AND REE GEOCHEMISTRY AT GOMISH-TAPPEH ZN-PB-CU (AG) DEPOSIT, SOUTHWEST OF ZANJAN

Author(s)

SALEHI T. | GHADERI M. | RASHIDNEJAD OMRAN N. | Issue Writer Certificate

Keywords

PLIOCENE VOLCANO-PLUTONIC SEQUENCEQ3

ALTERATIONQ2

ZN-PB-CU (AG)Q3

GOMISH-TAPPEHQ2

ZANJANQ1

Abstract

Gomish-Tappeh Zn-Pb-Cu (Ag) deposit is located 90 km southwest of ZANJAN, in northwestern part of Urumieh-Dokhtar volcano-plutonic zone. Exposed rocks at the area include Oligo-Miocene volcano-sedimentary and sedimentary sequences as well as PLIOCENE VOLCANO-PLUTONIC SEQUENCE (andesite porphyry dykes, dacitic sub volcanic dome and rhyodacitic volcanics). ALTERATION in the deposit developed as silicic, silicic-sulfidic, sericitic, carbonate, argillic and propylitic. Main mineralization at the GOMISH-TAPPEH deposit is observed as veins occurring in a steeply-deeping normal fault defined by an NE-SW trend in host rocks such as dacitic crystal litic tuff, dacitic sub volcanic dome, specifically the rhyolitic tuff. Para genetic minerals in the ore veins consist of pyrite, arsenopyrite, chalcopyrite, bornite, low-Fe sphalerite, galena, tetrahedrite and specularite. Gangue minerals accompanying the ores include quartz, calcite, chlorite, sericite and clay minerals. Based on geochemical data, average grades for samples from the ore veins at the GOMISH-TAPPEH deposit are: 4% Pb, 6% Zn, 2% Cu and 88 ppm Ag. Moreover, REE distribution patterns for altered samples of the dacitic sub volcanic dome and acidic tuff when compared with fresh samples, show enrichment in LREE, while HREE demonstrate various bahaviours. The negative Eu anomaly in chondrite-normalized REE patterns for these rocks is related to the increase in fluid/rock ratio and destruction of those grains of plagioclase enriched in Eu. REE distribution patterns for the silty tuff (footwall to the ore) compared with acidic tuff represent enrichment in all REE as well as positive Eu anomalies. However, the ore samples indicate more enrichment in LREE/HREE ratios and higher Eu contents when compared with wallrock of the ore veins (silty tuff). This is due to the influence of chloric magmatic-hydrothermal fluids that caused ALTERATION along the ore zone, releasing LREE and Eu from the host rocks and finally, concentrating and transporting these elements in the ore fluid.

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APA: Copy

SALEHI, T., GHADERI, M., & RASHIDNEJAD OMRAN, N.. (2011). MINERALOGY AND REE GEOCHEMISTRY AT GOMISH-TAPPEH ZN-PB-CU (AG) DEPOSIT, SOUTHWEST OF ZANJAN. JOURNAL OF ECONOMIC GEOLOGY, 2(2), 235-254. SID. https://sid.ir/paper/180480/en

Vancouver: Copy

SALEHI T., GHADERI M., RASHIDNEJAD OMRAN N.. MINERALOGY AND REE GEOCHEMISTRY AT GOMISH-TAPPEH ZN-PB-CU (AG) DEPOSIT, SOUTHWEST OF ZANJAN. JOURNAL OF ECONOMIC GEOLOGY[Internet]. 2011;2(2):235-254. Available from: https://sid.ir/paper/180480/en

IEEE: Copy

T. SALEHI, M. GHADERI, and N. RASHIDNEJAD OMRAN, “MINERALOGY AND REE GEOCHEMISTRY AT GOMISH-TAPPEH ZN-PB-CU (AG) DEPOSIT, SOUTHWEST OF ZANJAN,” JOURNAL OF ECONOMIC GEOLOGY, vol. 2, no. 2, pp. 235–254, 2011, [Online]. Available: https://sid.ir/paper/180480/en

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