Mehrdad Behzadi

Shahid Beheshti University

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Mohammad Yazdi

Shahid Beheshti University

Khalegh Khoshnoodi

Nuclear Science and Technology Research Institute

Aida Mohebi

Geological Survey of Iran

Mohammad Reza Rezvanianzadeh

Atomic Energy Organization of Iran

Fatemeh Haddad

Shahid Beheshti University

David R. Lentz

University of New Brunswick

Mohammad Hossein Adabi

Shahid Beheshti University

Saleh Deymar

Shahid Beheshti University

Mir Ali Asghar Mokhtari

University of Zanjan

Seyedeh Narges Sadati

University of Mohaghegh Ardabili

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Shahid Beheshti University

Geological Survey of Iran

China University of Geosciences

Atomic Energy Organization of Iran

Nuclear Science and Technology Research Institute

University of Tehran

China University of Geosciences (Beijing)

Chinese Academy of Geological Sciences

Geological Survey of Canada

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Formation and evolution of Th–REE mineralizing fluids at the Kiruna‐type Choghart iron oxide–apatite deposit, Central Iran: Insights from fluid inclusions and H‐C‐O isotopes

Geological Journal (2022)

Khalegh Khoshnoodi Mohammad Yazdi Mohammad Ghannadi‐Maragheh Samaneh Ziapour Saleh Deymar

The Choghart iron oxide–apatite (IOA) deposit is one of the largest iron mines of the Bafq district in Central Iran. This deposit is hosted by the Early Cambrian rhyolites, and diabase dikes crosscut both host rocks and the ore bodies. The Choghart rhyolites erupted in a continental arc setting, while the Choghart diabase dikes formed in a back‐arc basin environment. Thorite, minor titanite, and REE‐oxide are the main hosts of Th and REEs. The mineralogy and geochemistry support that the Th–REE mineralization formed at relatively reduced conditions. The presence of calcite accompanied by thorite and titanite suggests that Th and REE probably migrated as carbonate complexes in the mineralizing hydrothermal fluids. Microthermometric data of calcite associated with thorite indicate that the salinity of the ore‐forming fluids varies from 20 to 30 wt% NaCl equivalent with temperature estimates between 300 and 370°C. The narrow range of homogenization temperature and low salinities of the fluid inclusions imply the presence of only one fluid phase in the Th–REE mineralization. The calcite δ 13 C PDB (−3.9 to −4.1‰) and δ 18 O SMOW (6.6–7.0‰) support a magmatic source for the ore‐forming fluids. Actinolite δD (5.55–6.72‰) and δ 18 O (−100.8 to −82.4‰) also suggest a magmatic source of the ore‐forming fluids. Microthermometric data imply that fluid–rock interaction and cooling were critical factors triggering the thorite precipitation at Choghart IOA deposit. Stable isotopic data indicate that post‐magmatic fluids derived from rhyolitic magmas played a significant role in the Th–REE mineralization.

Titanite

Magmatic water

10.1002/gj.4399

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Citations (4)

Magmatic origin of Th-REE mineralization at the Se-Chahun ore deposit: based on geochemical and stable isotope data

Pizhūhish/hā-yi dānish-i zamīn (2019)

gholamreza mirzababaei Mohammad Yazdi mohammad qannadi maragheh Mehrdad Behzadi Mohammad Reza Rezvanianzadeh

بررسی الگوی ژئوشیمیایی پراکندگی عناصر کمیاب و نادر خاکی در سنگ‌های متأثر از متاسوماتیسم حاکی از یک منشأ ماگمایی برای کانه‌زایی Th-REE در کانسار سه‌چاهون است. بررسی الگوهای تمرکز عناصر کمیاب و نادرخاکی بهنجار شده نسبت به کندریت و جبه اولیه در سنگ‌های ریولیتی میزبان که در موقعیت فرورانش تشکیل شده‌اند و مقایسه این الگوها با الگوهای نظیر برای زون کانه‌زایی Th-REE نیز تأییدی بر این مسئله است که منشأ Th-REE در واقع همان ماگمای ریولیتی یا اتاق ماگمایی است که ماگمای ریولیتی از آن مشتق شده است. این مسئله با داده‌های ایزوتوپی اکسیژن و هیدروژن که از طریق بررسی ایزوتوپ‌های پایدار در کانی اکتینولیت پاراژنز با کانی‌های میزبان REE و Th به دست آمده نیز تأیید شده است. کانی‌های توریم شامل هوتونیت و توریت می‌باشند. نتایج آنالیز ایزوتوپی اکسیژن سیال در تعادل با اکتینولیت پاراژنز با هوتونیت و توریت 65/6 تا 71/7 پرمیل برآورد شد که در محدوده ترکیب ایزوتوپی اکسیژن ماگمایی (10 تا 6 پرمیل) قرار می‌گیرد. نتایج آنالیز ایزوتوپی هیدروژن سیال در تعادل با اکتینولیت نیز 29/73- تا 04/42- پرمیل محاسبه گردید که در محدوده ترکیب ایزوتوپی هیدروژن ماگمایی (50- تا 80- پرمیل) قرار گرفت.

10.52547/esrj.10.2.213

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Citations (0)

Using AHP Method in GIS for PCDs Potential Mapping in Southeast of Iran

Acta Geologica Sinica - English Edition (2014)

Aida Mohebi Hasan Mirnejad David R. Lentz Mehrdad Behzadi

Shahid

10.1111/1755-6724.12380_1

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Citations (3)

REE-Th mineralization in the Se-Chahun magnetite-apatite ore deposit, central Iran: Interplay of magmatic and metasomatic processes

Ore Geology Reviews (2021)

gholamreza mirzababaei Mohammad Yazdi Mehrdad Behzadi Mohammad Reza Rezvanianzadeh

Metasomatism

Ore genesis

Breccia

Magmatic water

10.1016/j.oregeorev.2021.104426

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Citations (5)

Alkali metasomatism as a process for Ti–REE–Y–U–Th mineralization in the Saghand Anomaly 5, Central Iran: Insights from geochemical, mineralogical, and stable isotope data

Ore Geology Reviews (2018)

Saleh Deymar Mohammad Yazdi Mohammad Reza Rezvanianzadeh Mehrdad Behzadi

Metasomatism

Diorite

Actinolite

Titanite

Paragenesis

10.1016/j.oregeorev.2018.01.008

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Citations (25)

Sulfide chemistry and sulfur isotope characteristics of the Cenozoic volcanic-hosted Kuh-Pang copper deposit, Saveh county, northwestern central Iran

Ore Geology Reviews (2017)

Shahrokh Rajabpour Mehrdad Behzadi Shao‐Yong Jiang Iraj Rasa Bernd Lehmann

Chalcocite

Bornite

Covellite

Argillic alteration

Hypogene

Supergene (geology)

Alunite

Stockwork

Sericite

Arsenopyrite

10.1016/j.oregeorev.2017.03.001

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Citations (34)

Petrography, geochemistry and tectonic setting of mafic- ultramafic intrusion in the Bafq 15th anomaly (Iron) (Central Iran)

DOAJ (DOAJ: Directory of Open Access Journals) (2020)

Sakine Amraei Mehrdad Behzadi Mohammad Yazdi

The mafic- ultramafic intrusion in the Bafq 15th anomaly (Iron) is located in 35 Km, of northwest of Bafq city, central Iran. The 15th anomaly intrusion intruded in Rizu sequence series, stratigraphically attributed to early Cambrian magmatism in west of Posht-e- Badam block. Rizu sequence series is composed of carbonate rocks of upper Neo-Proterozoic- early Cambrian. The mafic- ultramafic intrusion, includes amphibole- gabbro, apatite- gabbro, anorthosite- gabbro, amphibole- pyroxenite, apatite-pyroxenite with predominant granular texture and cumulate characteristics. The associated main mineral assemblage composed of cumulate primarily clino-pyroxene, Fe-Ti oxides, calcic plagioclase, amphibole, apatite, as well as minor olivine. The intrusion was formed from mafic magma and was differentiated from tholeiitic to weakly calc-alkaline affinity. Spider diagrams of the analyzed samples were normalized to the standard values of chondrite and primitive mantle. The REE– normalized diagrams are characterized by LILEs enrichment and HFSEs depletion and mild negative REEs trend. Different tectonic setting discriminative diagrams and elemental ratios are indicating that a subduction related affinity. The parental magma could be generated by melting of mantle peridotites (lithospheric mantle) which previously affected by subduction related fluids. The results of this research is consistent with the previous models which considered the Early Cambrian magmatism in Post-e- Badam block related to the subduction of Proto- Tethys oceanic crust beneath central Iran in north of Gondwana land.

Amphibole

Ultramafic rock

10.22108/ijp.2020.123179.1178

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Citations (1)