Petrological Journal

Petrology and tectono-magmatic setting of Zorrati granitoid, southwest of Birjand (East of Lut block)

Ebadolah Toulabi Nejad; Ahmad Ahamadi Khalaji; Mohammad Ebrahimi; Habib Biabangard; Rasoul Esmaeili

Articles in Press, Accepted Manuscript, Available Online from 23 July 2022

https://doi.org/10.22108/ijp.2021.125463.1207

Abstract

The Zorrati granitoid (ZG) pluton exposed on the eastern edge of the Lut block trending north-south. The Lut block surrounded in the north by the Darone fault, in the south by the Jazmurian ... Read More The Zorrati granitoid (ZG) pluton exposed on the eastern edge of the Lut block trending north-south. The Lut block surrounded in the north by the Darone fault, in the south by the Jazmurian fault and in the east and the west by Nahbandan and Naiband faults respectively (Naderi Miqan and Akrami, 2006). A number of investigations have been carried out by various researchers regarding how and when the magmatism and volcanism of the Lut Block was initiated among which Eftekharnezhad (1980) can be notable, who predicted the subduction of the oceanic crust towards the west and under the Lut Block based on the volume and time distribution. Saccani et al. (2010) suggested that the subduction of the oceanic crust took place towards the east and under the Afghan block. The closest intrusive bodies to the Zorrati granitoid are the Shah Kouh granitoid, the Deh Salam granitoid, the Chahar Farsakh granitoid, and the Sefidkoh granitoid.This dominant rocks of the pluton under study are biotite tonalite and syenogranite-alkali feldspar granite together with biotite and tourmaline porphyritic granodiorite, and granite. The ZG consisting of igneous and metasediment enclaves as well as felsic veins and dykes. According to several studies including field observations, petrology, and geochemical studies the rock units make up the studied pluton have possibly different origins.Materials and methodsFor lithological and geochemical investigations of the Zorrati granitoid pluton and its tonalitic enclaves, after microscopic studies, 11 fresh samples were selected and sent to the Institute of Geology and Geophysics of the Chinese Academy of Sciences for XRF and ICP-MS analyses.PetrographyThe constituent minerals of the granitoid rocks are quartz, plagioclase, microcline, orthoclase, biotite, muscovite and tourmaline.Whole Rock ChemistryThe Zorrati granitoid (ZG) is a high potassium calc-alkaline, peraluminous, and S-type granitoid. Trace element plots show at least two trends, which probably point to different origins for the rock units forming this pluton. The studied rocks are Rb, Th, U, K, and Pb enrichment and depleted in Nb, Sr, P, Ti, and Zr, indicative of the crustal origin of the relevant magmas in a collision zone. Tourmaline porphyritic granodiorite and syenogranite-alkali feldspar granite were formed by melting a clay-rich metapelitic protolith with upper crust origin due to muscovite dehydration without the intervention of the mantle in a continental collision zone. Porphyritic biotite granodiorite along with granite, biotite tonalite, and igneous enclaves were formed by melting of a metagreywacke-poor clay protolith with upper crustal origin due to biotite dehydration without the intervention of the mantle in a collision and a post-collision settings, respectively. Water pressure of ≥5 kbar and temperature of 650 to 700 °C were estimated for the tourmaline-biotite porphyritic granodiorites and the syenogranite-alkali feldspar granite. Likewise, temperature of ~775 °C was determined for the granite, biotite tonalite and igneous enclaves.DiscussionBiotite tonalite and syenogranite to alkali feldspar granite units are the two main and large granitoid units covering most of the area. The other units including granite, biotite, and tourmaline porphyritic granodiorite along with dikes and aplitic and pegmatite veins show high potassium and peraluminous calc-alkaline series related to S-type granites. The remarkable features of these rocks are of the Rb, Th, U, K, Pb enrichment and the Nb, Sr, P, Ti, and Zr depletion as well as having different origins and different tectonic environment. For example, the tourmaline-bearing porphyritic granodiorite and syenogranite to alkali feldspar granite were originated by melting of a metapelitic clay-rich source in the upper crust without mantle intervention, in a collisional tectonic environment while muscovite dehydration plays a significant role. Biotite-bearing porphyritic granodiorite along with granite, biotite-bearing tonalite, and its enclaves formed by melting of a plagioclase-rich metagreywacke in the upper crust without mantle interference, in a collisional and post-collisional tectonic environment, respectively, while dehydration of biotite was involved in their formation. According to their lithological, geochemical, tectonic characteristics and different origin, like the other granitoids in this part of the Lut block (Moradi Noghondar et al., 2012), two different ages of the Middle Jurassic (biotite-bearing tonalite) and the Eocene - Oligocene (syenogranite - alkali feldspar granite) can be suggested for the Zorrati granitoid (ZG) pluton.

Evidence for magmatic mingling/mixing process in intrusive bodies of Qorveh (Kurdistan): with emphasis on textural and geochemical characteristics

Seyedeh Azam Mousavi; Ashraf Torkian

Articles in Press, Accepted Manuscript, Available Online from 14 May 2022

https://doi.org/10.22108/ijp.2022.130372.1251

Abstract

The studied intrusive bodies are located in the N-Sanandaj-Sirjan Zone and Kurdistan Province. In these masses, the host rocks include granite, granodiorite and monzonite, and the enclaves ... Read More

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Evolution of the ore-forming fluids in the Dashkasan gold deposit, NE Qorveh, West of Iran, based on tourmaline chemical composition and fluid inclusion data

Mohammad Moradi; Zahra Alaminia; Ebrahim Tale Fazel; Mahin Mansouri Esfahani

Articles in Press, Accepted Manuscript, Available Online from 31 May 2022

https://doi.org/10.22108/ijp.2022.132378.1265

Abstract

The Dashkasan gold deposit with 52 Mt of oxidized ore reserves at mean grades of 1.77 g/t Au is hosted by porphyritic dacite/rhyodacite rocks. Tourmaline mineralization occurs as ... Read More

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Geology, mineralization and geochemistry of ore-mineral and intrusive rocks in North of Bahariyeh area, East of Kashmar, NE Iran

Fatemeh Najmi; Azadeh Malekzadeh Shafaroudi; mohammad Hassan Karimpour

Articles in Press, Accepted Manuscript, Available Online from 28 September 2022

https://doi.org/10.22108/ijp.2022.132381.1266

Abstract

The North of Baharieh prospecting area is located central part of Khaf-Kashmar-Bardaskan magmatic belt (KKBMB), east of Kashmar in Khorasan Razavi province. This area includes outcrops ... Read More

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Investigation on Tourmaline Occurrence in Metamorphic Complex of the North of Golpayegan, Sanandaj-Sirjan Zone

solomon Ahmadi Bonakdar; SEYED MOHSEN TABATABAEI MANESH; Akramosadat Mirlohi

Articles in Press, Accepted Manuscript, Available Online from 15 January 2023

https://doi.org/10.22108/ijp.2023.134165.1283

Abstract

The occurrence of tourmaline is observed in two areas in the north of Golpayegan. In the first area, on the west side of Ochestan farm, tourmaline occurs inside the crystallised mass ... Read More

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Lithology and tectono-magmatic setting of volcanic and plutonic rocks from the Lak area, southwest Buin Zahra, NW Iran

Mohammad Saeed Firouzbakht; Majid Ghaderi; Hossein Ali Tajeddin

Articles in Press, Accepted Manuscript, Available Online from 20 February 2023

https://doi.org/10.22108/ijp.2023.133697.1278

Abstract

The Lak area is situated 36 km southwest of Buin Zahra, in the northern part of the Urumieh-Dokhtar magmatic belt in northwestern Iran. The main outcrops of the study area include Eocene ... Read More

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Volume & Issue: Articles in Press

Petrology and tectono-magmatic setting of Zorrati granitoid, southwest of Birjand (East of Lut block)

Abstract

Evidence for magmatic mingling/mixing process in intrusive bodies of Qorveh (Kurdistan): with emphasis on textural and geochemical characteristics

Abstract

Evolution of the ore-forming fluids in the Dashkasan gold deposit, NE Qorveh, West of Iran, based on tourmaline chemical composition and fluid inclusion data

Abstract

Geology, mineralization and geochemistry of ore-mineral and intrusive rocks in North of Bahariyeh area, East of Kashmar, NE Iran

Abstract

Investigation on Tourmaline Occurrence in Metamorphic Complex of the North of Golpayegan, Sanandaj-Sirjan Zone

Abstract

Lithology and tectono-magmatic setting of volcanic and plutonic rocks from the Lak area, southwest Buin Zahra, NW Iran

Abstract