Geochemical discrimination of intrusions in the Choran Cu-Au deposit, Iran, using silicate chemistry

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Geochemical discrimination of intrusions in the Choran Cu-Au deposit, Iran, using silicate chemistry. / Zarasvandi, Alireza; Tashi, Majid; Raith, Johann; Rezaei, Mohsen; Mousivand, Fardin; Saki, Adel.

In: Journal of geochemical exploration, Vol. 2020, 2020.

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Zarasvandi, Alireza ; Tashi, Majid ; Raith, Johann ; Rezaei, Mohsen ; Mousivand, Fardin ; Saki, Adel. / Geochemical discrimination of intrusions in the Choran Cu-Au deposit, Iran, using silicate chemistry. In: Journal of geochemical exploration. 2020 ; Vol. 2020.

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@article{9f30eec62b3848e49676af7cea18f304,
title = "Geochemical discrimination of intrusions in the Choran Cu-Au deposit, Iran, using silicate chemistry",
abstract = "The Choran Cu-Au deposit is located 70 km of Bardsir in the southern part of Urumieh-Dokhtar magmatic belt (UDMB). In this area, mineralization is associated with Oligocene –Miocene quartz diorite and granodiorite intrusions emplaced within Eocene volcanic–pyroclastic – sedimentary sequences. Main hydrothermal altera- tions in the Choran region include sodic-potassic and potassic as well as phyllic, alunite and kaolinite which extended mostly in the granodiorite. Mineralizations at the Choran deposit involve pyrite, arsenopyrite, chal- copyrite, chalcocite, covellite and sphalerite. The composition of the plagioclase in the granodiorite and quartz diorite rocks ranges from albite (66.8 to 48.7) and (64.8 to 51.4) respectively. Also, Al/(Ca + Na + K) ratios of plagioclase in granodiorite samples (average; 1.50) are higher than that of quartz diorite intrusions (average; 1.33) which is analogous to those reported previously for mineralized porphyry systems. All studied primary and re-equilibrated biotites are collectively clustered in the Mg-biotite field. However, based on the log (XMg/XFe) versus log (XF/XOH) of biotite, granodiorite units are associated with I-type moderately crustal contaminated (I- MC) suite, whereas quartz diorite biotites represent I-type weakly crustal contaminated (I-WC) character. Comparison of biotite halogen contents indicates that F and Cl values increase from quartz diorite to grano- diorite intrusions. Importantly, biotite thermometry of granodiorite and quartz diorite samples indicate tem- peratures of < 400 °C (quartz diorite; average 340 °C, granodiorite; average 379 °C) which are overlapped with temperature of sulfide mineralization in the porphyry systems (< 400 °C). Totally, through assessing the key factors of mineralization using silicate chemistry, it is proved that granodiorite units have higher potential to form porphyry-style sulfide mineralization in the Choran deposit.",
keywords = "Ore deposits, ore deposits",
author = "Alireza Zarasvandi and Majid Tashi and Johann Raith and Mohsen Rezaei and Fardin Mousivand and Adel Saki",
year = "2020",
language = "English",
volume = "2020",
journal = "Journal of geochemical exploration",
issn = "0375-6742",
publisher = "Elsevier BV",

}

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TY - JOUR

T1 - Geochemical discrimination of intrusions in the Choran Cu-Au deposit, Iran, using silicate chemistry

AU - Zarasvandi, Alireza

AU - Tashi, Majid

AU - Raith, Johann

AU - Rezaei, Mohsen

AU - Mousivand, Fardin

AU - Saki, Adel

PY - 2020

Y1 - 2020

N2 - The Choran Cu-Au deposit is located 70 km of Bardsir in the southern part of Urumieh-Dokhtar magmatic belt (UDMB). In this area, mineralization is associated with Oligocene –Miocene quartz diorite and granodiorite intrusions emplaced within Eocene volcanic–pyroclastic – sedimentary sequences. Main hydrothermal altera- tions in the Choran region include sodic-potassic and potassic as well as phyllic, alunite and kaolinite which extended mostly in the granodiorite. Mineralizations at the Choran deposit involve pyrite, arsenopyrite, chal- copyrite, chalcocite, covellite and sphalerite. The composition of the plagioclase in the granodiorite and quartz diorite rocks ranges from albite (66.8 to 48.7) and (64.8 to 51.4) respectively. Also, Al/(Ca + Na + K) ratios of plagioclase in granodiorite samples (average; 1.50) are higher than that of quartz diorite intrusions (average; 1.33) which is analogous to those reported previously for mineralized porphyry systems. All studied primary and re-equilibrated biotites are collectively clustered in the Mg-biotite field. However, based on the log (XMg/XFe) versus log (XF/XOH) of biotite, granodiorite units are associated with I-type moderately crustal contaminated (I- MC) suite, whereas quartz diorite biotites represent I-type weakly crustal contaminated (I-WC) character. Comparison of biotite halogen contents indicates that F and Cl values increase from quartz diorite to grano- diorite intrusions. Importantly, biotite thermometry of granodiorite and quartz diorite samples indicate tem- peratures of < 400 °C (quartz diorite; average 340 °C, granodiorite; average 379 °C) which are overlapped with temperature of sulfide mineralization in the porphyry systems (< 400 °C). Totally, through assessing the key factors of mineralization using silicate chemistry, it is proved that granodiorite units have higher potential to form porphyry-style sulfide mineralization in the Choran deposit.

AB - The Choran Cu-Au deposit is located 70 km of Bardsir in the southern part of Urumieh-Dokhtar magmatic belt (UDMB). In this area, mineralization is associated with Oligocene –Miocene quartz diorite and granodiorite intrusions emplaced within Eocene volcanic–pyroclastic – sedimentary sequences. Main hydrothermal altera- tions in the Choran region include sodic-potassic and potassic as well as phyllic, alunite and kaolinite which extended mostly in the granodiorite. Mineralizations at the Choran deposit involve pyrite, arsenopyrite, chal- copyrite, chalcocite, covellite and sphalerite. The composition of the plagioclase in the granodiorite and quartz diorite rocks ranges from albite (66.8 to 48.7) and (64.8 to 51.4) respectively. Also, Al/(Ca + Na + K) ratios of plagioclase in granodiorite samples (average; 1.50) are higher than that of quartz diorite intrusions (average; 1.33) which is analogous to those reported previously for mineralized porphyry systems. All studied primary and re-equilibrated biotites are collectively clustered in the Mg-biotite field. However, based on the log (XMg/XFe) versus log (XF/XOH) of biotite, granodiorite units are associated with I-type moderately crustal contaminated (I- MC) suite, whereas quartz diorite biotites represent I-type weakly crustal contaminated (I-WC) character. Comparison of biotite halogen contents indicates that F and Cl values increase from quartz diorite to grano- diorite intrusions. Importantly, biotite thermometry of granodiorite and quartz diorite samples indicate tem- peratures of < 400 °C (quartz diorite; average 340 °C, granodiorite; average 379 °C) which are overlapped with temperature of sulfide mineralization in the porphyry systems (< 400 °C). Totally, through assessing the key factors of mineralization using silicate chemistry, it is proved that granodiorite units have higher potential to form porphyry-style sulfide mineralization in the Choran deposit.

KW - Ore deposits

KW - ore deposits

M3 - Article

VL - 2020

JO - Journal of geochemical exploration

JF - Journal of geochemical exploration

SN - 0375-6742

ER -