Petrological Journal - Articles List

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.

Petrogenesis of fertile Skarns related to Songhor granitoid complex (North of Sanandaj- Sirjan Zone, Iran)

forough moazami goodarai; Reza Zareisahamieh; Hasan Zamanian; Ahmad Ahamadi Khalaji; Shahriar mahmoudi

Volume 13, Issue 2 , August 2022, , Pages 31-64

https://doi.org/10.22108/ijp.2021.125518.1208

Abstract

IntroductionMagmatic fluids released at the end of magmatic crystallization interact with carbonate country rocks through metasomatism and form the skarns (Meinert et al., 2005). In ... Read More IntroductionMagmatic fluids released at the end of magmatic crystallization interact with carbonate country rocks through metasomatism and form the skarns (Meinert et al., 2005). In general, the magmatic rocks are associated with skarnization range from diorite-gabbro to granite in composition (Kuşcu et al., 2019). The ore deposits types (e.g., Cu, Au, Fe, Zn) are controlled by the nature of the magmatic source region (Wu et al., 2017).In this study, we first synthesized the spatial distribution, and geological and geochemical data of Late Mesozoic (Middle Jurassic–Early Cretaceous) granitoids and associated mineral deposits of Songhor plutonic in the northwest of Sanandaj-Sirjan zone and compared with worldwide skarn associated granitoids. Finally we try to reach a better understanding evolution of granitoid and correlations between skarns and the related mineralization of the Songhor plutonic assembleg during Late Mesozoic. Redgional geologyThe Galali Fe deposit is typical of skarn deposits in the Sanandaj-Sirjan metallogenic zone (SSZ), in the northeast Songhor. Mineralization in the Galali deposit is related to Songhor intrusive rocks assembleg (Eocene-Oligocene) and orebodies are predominantly hosted by Songhor Formation (Triassic-Jurassic). Petrography and geochemistry of Songhor granitoid complex (SGC) intrusive rocks have been investigated by some workers (i.e. Aliani, 2014).Materials and methodsMajor oxides were determined using an X-ray fluorescence spectrometer, whereas the trace and rare-earth elements were analyzed by Inductively Coupled Plasma Atomic Emission Spectrometry (ICP-AES) at Zarazma laboratory company, Tehran Iran.Petrography, mineral chemistry, whole rock chemistryBased on mineralogy and geochemistry, three main facies have been recognized in the Songhor plutonic assemblage: (1) the granite (leucocratic), (2) monzonite to diorite (mesocratics) and (3) gabbro. In the Galali district both calcic exoskarn and endoskarn occur along the contacts between granitoid and host carbonated rocks. The field observations and the whole rock geochemical data obtained from the intrusive rocks in the northeast of Sonqor indicate the relationship between the region's deposits (Iron Skarn) and their tectonic and petrogenic nature.In general, Songhor granitoid complex mineralogically contain Ca-plagioclase and magnesio-hornblende, and it has a metaluminous (ASI < 1) composition, with LREE, LILE enrichment and HREE depletion. The SGC samples can be divided into two groups, based on their SiO2 contents, Na2O/K2O ratios, and incompatible elements compositions. The samples have a relatively wide range of SiO2 content and Mg# values, indicating that these units formed from magmas with variable amounts of fractional crystallization. In the Harker diagrams, there is a negative correlation between SiO2 and FeO, MgO, and CaO. Thus, these rocks record the hornblende and biotite fractionation. Similar to studies of Wu et al. (2017), the strong depletion in Ba, Sr, Eu, and Ti points to an extensive fractional crystallization during the emplacement.DiscussionFractional crystallization would significantly increase the concentrations of W or the other incompatible elements in the magmas, which is necessary for the occurrence of related mineralization (Romer and Kroner, 2016). The results of this research indicate that the Songhor A-type alkali granite formed from the depleted mantle-derived magmas which have undergone assimilation and fractional crystallization processes. The progression from I-type to A-type magmatism appears to mark a significant change from a collisional to an extensional setting in this region, in the Late Jurassic. Geochemical characteristics in Rb versus Sc and Rb/Sr versus Zr diagrams show that mesocratic phase 1 unit, highly-oxidized and less-evolved granitoids generated by a mixture of mantle-derived and mature crust-derived components, related to subduction of Neo-Tethyan oceanic crust beneath the Sanandaj-Sirjan zone. These intrusions are syn-collisional and have a high potential for skarn Fe- Cu-Au deposits.The A-type leucocratic granite shows an alkaline nature, high potassium, high ratio Ga/Al, enrichment of HFSE (i.e. Ta, Nb, Ga, Zr, and Pb), Eu, and compatible elements (i.e. Cr) depletion in the pattern. It has formed in a magmatic arc or post-collisional setting from a hybrid source, with crustal and mantle components, contaminated by interaction with the upper crust. It is a highly-evolved granitoid that can be highly prospective for Mo, Sn, and W mineralization.AcknowledgementsThis contribution is based on field and laboratory studies carried out at the Lorestan University Funding for this project was provided by the Research Office at the Lorestan and Kharazmi University. I wish to acknowledge the generous support from all staff of this office. Deserved thanks go to Dr. Bizhan Yousefi Yeganeh for proofreading and their helpful suggestions. ReferencesAliani, F., Maanijou, M. and Miri, M. (2011) Petrology of the Tekyeh-Bala area granite veins (northeast of arcs in Mexico). Geological Society of America Bulletin, 93, 533–544.Kuşcu, İ., Tosdal, R. M. and Gençalioğlu-Kuşcu, G. (2019) Episodic Porphyry Cu (- Mo- Au) formation and associated magmatic evolution in Turkish Tethyan. Ore Geology Reviews, 107, 119- 154.Meinert, L. D., Dipple, G. M. and Nicolescu, S. (2005) World skarn deposits. Economic Geology, 100, 299-336.Romer, R. L. and Kroner, U. (2016) Phanerozoic tin and tungsten mineralization—Tectonic controls on the distribution of enriched protoliths and heat sources for crustal melt ing. Gondwana Research, 31, 60–95.Wu, F. Y., Liu, Z. C., Ji, W.Q., Wang, J. M. and Yang, L. (2017) Highly fractionated granites: Recognit ion and research. Science China Earth Sciences, 60(7), 1201- 1219.

Petrology, geochemistry, source and tectonic setting of Malek Chah Ruii granitoid (East of Lut Block)

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

Volume 12, Issue 1 , June 2021, , Pages 63-92

https://doi.org/10.22108/ijp.2020.124366.1196

Abstract

The Malek Chah Rouii granitoid pluton is exposed within the Deh-Salm metamorphic complex in the eastern margin of the Lut zone. The studied granitoid with peraluminous and calc-alkaline ... Read More

The study of mineral chemistry of the Harzburgite in the Noorabad-Harsin ophiolite complex: Evidence from the evolution of partial melting of mantle peridotite from the deep ocean to the subduction zone

Samaneh Falah; Ahmad Ahamadi Khalaji; Ayoub Veisinia; zahra Tahmasbi; Ahman Rahimzade

Volume 11, Issue 1 , May 2020, , Pages 1-28

https://doi.org/10.22108/ijp.2019.116059.1125

Abstract

The Noorabad-Harsin ophiolite complex as part of the Kermanshah ophiolite is located in the high Zagros zone. The ophiolitic complex from the lower part to upper part is composed of ... Read More

Petrological and isotopic study of basaltic rocks of Barzand area and comparison with Poshtasar originat basalts in South of Germi

Mohammad Mobashergermi; Reza Zarei Sahamieh; Mehraj Aghazadeh; Ahmad Ahamadi Khalaji; Gholamreza Ahmadzadeh; Peter Le Roux

Volume 10, Issue 1 , June 2019, , Pages 23-52

https://doi.org/10.22108/ijp.2018.110094.1079

Abstract

basaltic rocks in Barzand area (Continue to Kousmalyn basaltic rocks in Iran) show parallel trend with Poshtasar basalt and they have older age according to stratigraphy in comparison ... Read More

Geochemistry and tectonic setting of basic dykes in the Boroujerd area (Sanandaj- Sirjan Zone)

Zahra Tahmasbi; Hadis Ghasemifard; Ahmad Ahmadi khalaji; Leili Izadikian

Volume 8, Issue 29 , June 2017, , Pages 153-170

https://doi.org/10.22108/ijp.2017.21586

Abstract

Basic dykes, trending NE-SW and cross cutting the middle Jurassic granodioritic rocksexposed in the Boroujerd area. They are dark green and fine to medium–grained rocksand are ... Read More

Mineral chemistry and thermobarometry of migmatitic rocks of Boroujerd area (north of Sanandaj-Sirjan zone)

Arifeh Heydarianmanesh; Zahra Tahmasbi; Ahmad Ahmadi Khalaji

Volume 7, Issue 25 , April 2016, , Pages 117-138

https://doi.org/10.22108/ijp.2016.20836

Abstract

Migmatites have formed an important part of high-grade metamorphism in the Boroujerd area aureole (north of Sanandaj-Sirjan zone). Migmatitic complex including: migmatites, schist migmatites ... Read More

The geochemical and tectonic characteristics of the volcanic rocks in the east of Nahavand area (Sanandaj-Sirjan zone)

Samira Basiri; Somayeh Rahmani; Ahmad Ahmadi Khalaji; Zahra Tahmasbi

Volume 6, Issue 23 , October 2015, , Pages 1-26

Abstract

The studied area is located in east of Nahavand which is a part of Sanandaj-Sirjan zone. The petrographic and geochemical investigations show that, these rocks consist of basalt, andesite-basalt, ... Read More

Petrology, geochemistry and mineral chemistry of the subvolcanic rocks and enclaves in the Shirmazdtapeh area (SW Arak)

Mansoureh Miresmaeili; Zahra Tahmasbi; Ahmad Ahmadi Khalaji; Farzaneh Sepahvand

Volume 6, Issue 22 , July 2015, , Pages 137-156

Abstract

The sub volcanic rocks in Shazand area (the Markazi province) which formed a part of the Sanandaj-Sirjan zone are composed of dacitic rocks with major minerals such as plagioclase, ... Read More

Petrography, mineral chemistry and geochemistry of granitoids of the Samen plutonic complex (SW Malayer, Hamedan)

Ahmad Ahmadi Khalaji; Farahnaz Sepahvand; Ali Asghar Sepahi Gerow; Sedigheh Salami

Volume 5, Issue 18 , November 2014, , Pages 77-92

Abstract

The Malayer plutonic complex is located in the northern Sanandaj-Sirjan zone of the western Iran. An intrusive body with granodioritic component known as the Samen granodiorite is in ... Read More

Petrographical and geochemical characteristics of enclaves in Astaneh area (Southwest of Arak)

Zara Tahmasbi; Mahmoud Khalili; Ahmad Ahmadi Khalaji

Volume 2, Issue 6 , November 2011, , Pages 31-46

Abstract

The Astaneh granodiorite intrusion, located in the southwest of Arak, is characterized by rounded and rarely ellipsoid microgranular enclaves ranging in composition from gabbro to diorite ... Read More

Using of mineral chemistry to determine the formation conditions of Boroujerd granitoid complex and its metamorphic aureole

Zahra Tahmasbi; Ahmad Ahmadi Khalaji

Volume 1, Issue 2 , September 2010, , Pages 77-94

Abstract

The composition of Boroujerd granitoid varies from quartz diorite, granodiorite to monzogranite associated with acidic dykes intruded into the Hamedan phyllite and developed a metamorphic ... Read More

Petorgenesis of the granitoid body in the south of Shazand (South western Arak)

Zahra Tahmasbi; Mahmoud Khalili; Ahmad Ahmadi khalaji; Mohammad Ali Makki zadeh

Volume 1, Issue 1 , June 2010, , Pages 87-102

Abstract

The Astaneh granitoid massif represents a small portion of Sanandaj â Sirjan zone and consists of tonalite, granodiorite, monzogranite and rhyodacite, being the granodiorites ... Read More

Volume 13 (2022)

Volume 12 (2021)

Volume 11 (2020)

Volume 10 (2019)

Volume 9 (2018)

Volume 8 (2017)

Volume 7 (2016)

Volume 6 (2015)

Volume 5 (2014)

Volume 4 (2013)

Volume 3 (2012)

Volume 2 (2011)

Volume 1 (2010)

Author = Ahamadi Khalaji, Ahmad

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