Petrological Journal

Geochemical-metallogenic evolution of Agh-Daragh igneous rocks (north of Ahar) links to Cu-Au±W occurrences

Heydar Asgharzadeh-asl; Ebrahim Tale Fazel; Behzad Mehrabi; Fariborz Masoudi

Volume 8, Issue 32 , March 2018, , Pages 21-44

https://doi.org/10.22108/ijp.2017.100426.0

Abstract

The Agh-Daragh study area in the north of Ahar is located in Ahar-Arasbaran zone. The area is distinguished by W, Cu and Au metal endowment and has been explored during stream sediment ... Read More The Agh-Daragh study area in the north of Ahar is located in Ahar-Arasbaran zone. The area is distinguished by W, Cu and Au metal endowment and has been explored during stream sediment and heavy mineral exploration. At least, three mineral occurrences are detected in Agh-Daragh area including Cu stockwork-disseminated mineralization in Chupanlar (occurred in Omz quartz-monzonite), Cu-Au±W vein-type mineralization in Ayran Goli (occurred in Og granodiorite), and Fe±Cu skarn in Gowdal (occurred between quartz-monzonite unit and crystallized carbonate). Chemically, Agh-Daragh mineralization-related metaluminous granitoids belong to oxidized, I-type and high-K calc-alkaline to shoshonitic series. They have SiO2 = 63.5–67.6 wt%, Al2O3 = 14–16.5 wt%, and K2O/Na2O = 0.5–1.8. Moreover, LILE enrichment relative to HFSE depletion and HREE in the granitoids and the dikes occurred due to fluid-melt interaction, which are characteristics of subduction tectonic environment. In their magmatic evolution, the Agh-Daragh intrusive rocks underwent a transition from the early intrusive phases belonging to granodiorite (Og unit) with low K/Na and Fe2O3/FeO ratios and to the late intrusive phases belonging to quartz-monzonite (Omz unit) enriched in K (K/Na >1) and oxidized (Fe2O3/FeO >1). It seems that high content of volatiles in high-K and oxygenate magmas occurs due to saturation of magmatic melt in water under a lower degree of quartz-monzonite crystallization immediately preceding Cu-Au±W mineralization at Agh-Daragh intrusive suite. Combining our field geology and geochemical-metallogenic evidences, we conclude that the mineralization in Agh-Daragh area mostly occurred in accompany with late quartz-monzonite stocks; as a result, identification of high-K intrusive rocks and related dikes have important implications for proceeding exploration planning specially indicating of drilling points, and further refines the basis for mineral exploration in Sheyviar Dagh intrusive suite and subsequently in Ahar-Arasbaran metallogenic zone.

The presence of Precambrian basement in Gole Gohar of Sirjan (south of Iran)

Elham Safarzadeh; Fariborz Masoudi; Jamshid Hassanzadeh; Seyed Mohammad Pourmoafi

Volume 7, Issue 26 , July 2016, , Pages 153-170

https://doi.org/10.22108/ijp.2016.20847

Abstract

The mylonitic granitoids of Gole Gohar, south east of Sirjan, are located in a key area which their study is important for understanding the history of Precambrian basement of Sanandaj- ... Read More

Petrography, petrogenesis and geodynamic of Sawlava ophiolitic complex, NW of Iran

Bahman Rahimzadeh; Fariborz Masoudi; Hossein Moinvaziri; Khalil Allahyari

Volume 4, Issue 14 , July 2013, , Pages 93-114

Abstract

Zagros ophiolites are mainly exposed in Oman, Neyriz, Kermanshah, Kurdistan and north western of Iraq. The Sawlava ophiolitic complex is a member of Kurdistan ophiolites. In this research ... Read More

Geochemistry, petrogenesis and tectonic setting of Kamarbon Theralitic, Teschenitic gabbroic intrusion (Central Alborz)

Roghieh Doroozi; Fariborz Masoudi

Volume 3, Issue 12 , March 2013, , Pages 89-102

Abstract

In the northern hillside of Central Alborz, south of Kamarbon village, there is an outcrop of alkaline gabbroic intrusion that its petrogenesis and tectonic environment have been studied ... Read More

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Author = Masoudi, Fariborz

Geochemical-metallogenic evolution of Agh-Daragh igneous rocks (north of Ahar) links to Cu-Au±W occurrences

Abstract

The presence of Precambrian basement in Gole Gohar of Sirjan (south of Iran)

Abstract

Petrography, petrogenesis and geodynamic of Sawlava ophiolitic complex, NW of Iran

Abstract

Geochemistry, petrogenesis and tectonic setting of Kamarbon Theralitic, Teschenitic gabbroic intrusion (Central Alborz)

Abstract