Geochemistry and statistical analyses of porphyry system and epithermal veins at Hizehjan in north-western Iran

• Autorzy: Radmard K. , Zamanian H. , Hosseinzadeh M. R. , Khalaji A. A.

Identyfikatory

DOI

10.1515/logos-2017-0020

• Języki publikacji: EN

Abstrakty

EN

Situated about 130 km northeast of Tabriz (northwest Iran), the Mazra’eh Shadi deposit is in the Arasbaran metallogenic belt (AAB). Intrusion of subvolcanic rocks, such as quartz monzodiorite-diorite porphyry, into Eocene volcanic and volcano-sedimentary units led to mineralisation and alteration. Mineralisation can be subdivided into a porphyry system and Au-bearing quartz veins within andesite and trachyandesite which is controlled by fault distribution. Rock samples from quartz veins show maximum values of Au (17100 ppb), Pb (21100 ppm), Ag (9.43ppm), Cu (611ppm) and Zn (333 ppm). Au is strongly correlated with Ag, Zn and Pb. In the Au-bearing quartz veins, factor group 1 indicates a strong correlation between Au, Pb, Ag, Zn and W. Factor group 2 indicates a correlation between Cu, Te, Sb and Zn, while factor group 3 comprises Mo and As. Based on Spearman correlation coefficients, Sb and Te can be very good indicator minerals for Au, Ag and Pb epithermal mineralisation in the study area. The zoning pattern shows clearly that base metals, such as Cu, Pb, Zn and Mo, occur at the deepest levels, whereas Au and Ag are found at higher elevations than base metals in boreholes in northern Mazra’eh Shadi. This observation contrasts with the typical zoning pattern caused by boiling in epithermal veins. At Mazra’eh Shadi, quartz veins containing co-existing liquid-rich and vapour-rich inclusions, as strong evidence of boiling during hydrothermal evolution, have relatively high Au grades (up to 813 ppb). In the quartz veins, Au is strongly correlated with Ag, and these elements are in the same group with Fe and S. Mineralisation of Au and Ag is a result of pyrite precipitation, boiling of hydrothermal fluids and a pH decrease.

Słowa kluczowe

EN

Mazra’eh Shadi-Hizehjan; quartz monzodiorite; Spearman correlation; boiling

PL

kwarcowy monzodioryt; korelacja Spearmana; wrzenie

• Wydawca: Uniwersytet im. Adama Mickiewicza. Instytut Geologii
• Czasopismo: Geologos
• Rocznik: 2017
• Tom: Vol. 23, No. 3
• Strony: 183--200
• Opis fizyczny: Bibliogr. 23 poz.

Twórcy

autor

Radmard K.

• Department of Geology, Faculty of Natural Sciences, Lorestan University, Khoram Abad, Iran

autor

Zamanian H.

• Department of Geology, Faculty of Natural Sciences, Lorestan University, Khoram Abad, Iran

autor

Hosseinzadeh M. R.

• Department of Earth Sciences, Faculty of Natural Sciences, University of Tabriz, Tabriz, Iran

autor

Khalaji A. A.

• Department of Geology, Faculty of Natural Sciences, Lorestan University, Khoram Abad, Iran

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Uwagi

Opracowanie ze środków MNiSW w ramach umowy 812/P-DUN/2016 na działalność upowszechniającą naukę (zadania 2017).