U-Pb zircon geochronology of late Neoproterozoic–Early Cambrian granitoids in Iran: Implications for paleogeography, magmatism, and exhumation history of Iranian basement

Hassanzadeh, Jamshid; Stöckli, Daniel F.; Horton, Brian K.; Axen, Gary J.; Stockli, Lisa D.; Grove, Marty; Schmitt, Axel K.; Walker, J. Douglas

doi:10.1016/j.tecto.2007.11.062

Cited by 306 publications

(159 citation statements)

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“…The late Miocene high-K Saray volcanic rocks appear to crosscut the Iranian basement. The Cadomian granitic gneisses show similarity to those described in central Iran by Hassanzadeh et al (2008 type alkaline gabbros and show intrusive contacts with these alkaline rocks. The gabbroic rocks yielded Ar-Ar ages of ca.…”

Section: Geological Setting and Field Relationships Of High-k Volcanisupporting

confidence: 62%

“…The metamorphic rocks (granitic gneiss; sample CHJ09-12) of the Chah-Jam complex from central Iran with Cadomian age (ca. 550 Ma; Shafaii Moghadam et al, unpublished data), are considered as assimilant in the mid-crustal level, exhumed during the extension phases in the late Cretaceous in Iran (Hassanzadeh et al, 2008). These rocks have the same ages and similar mineral assemblages to those of the Cadomian granitic gneisses that host the high-K Saray volcanic rocks.…”

Section: Assimilation-fractional Crystallization Processes (Afc): Anmentioning

confidence: 99%

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Late Miocene K-rich volcanism in the Eslamieh Peninsula (Saray), NW Iran: Implications for geodynamic evolution of the Turkish–Iranian High Plateau

et al. 2014

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a b s t r a c tKeywords: High-K lavas Geochemistry, Sr-Nd-Pb isotopes, Post-collisional magmatism Iran Post-collisional volcanism in northwestern Iran is represented by the Saray high-K rocks including leucite-bearing under-saturated and leucite-free silica saturated rocks. We report Ar-Ar age data which constrain the age as ca. 11Ma (late Miocene). Most of clinopyroxene phenocrysts from the volcanic rocks have complex oscillatory zoning, with high Ti and Al cores, low Ti and high Al mantled clinopyroxenes, grading into low Ti and Al outer rims. All the rocks are highly enriched in incompatible trace elements and have identical Sr-Nd-Pb isotopes. Enrichment in incompatible elements and other geochemical features for the Saray lavas suggest a metasomatized sub-continental lithospheric mantle (SCLM) as the magma source. The negative Nb- Ta Pb isotopic values of the Saray lavas imply the involvement of slab terrigenous sediments and/or a continental lithosphere. Isotopically, the volcanic rocks define a binary trend, representing 5-8% mixing between the primary mantle and sediment melts. Our melting models suggest residual garnet in the source and are incompatible with partial melting of amphibole and/or phlogopite bearing lherzolites, although the complex geochemical features might indicate the result of mixing between melts produced by different sources or a homogenous melt passing through a compositionally-zoned mantle during multiple stages of partial melting and melt migration. The geochronological, geochemical and isotopic data for the Saray rocks suggest that these Late Miocene magmas were derived from a small degree of partial melting of subduction-metasomatized (subcontinental) lithospheric mantle source in a post-collisional setting.

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Section: Geological Setting and Field Relationships Of High-k Volcanisupporting

confidence: 62%

Section: Assimilation-fractional Crystallization Processes (Afc): Anmentioning

confidence: 99%

Late Miocene K-rich volcanism in the Eslamieh Peninsula (Saray), NW Iran: Implications for geodynamic evolution of the Turkish–Iranian High Plateau

et al. 2014

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“…Although the block was originally thought to have formed during the Pan-African intra-continental extension [50][51][52], it has recently been redefined as a magmatic arc ( Fig. 1) developed along the Proto-Tethyan margin of the Gondwanan supercontinent [45,[53][54][55]. Some authors have reported geological features, predominantly bimodal alkaline volcanism, suggestive of an extensional back-arc regime in the eastern portion of the area [47,48,56].…”

Section: Regional Geologymentioning

confidence: 99%

Identification of mineralized zones in the Zardu area, Kushk SEDEX deposit (Central Iran), based on geological and multifractal modeling

et al. 2016

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Abstract:The aim of this paper is to delineate the different lead-zinc mineralized zones in the Zardu area of the Kushk zinc-lead stratabound SEDEX deposit, Central Iran, through concentration-volume (C-V) modeling of geological and lithogeochemical drillcore data. The geological model demonstrated that the massive sulfide and pyrite+dolomite ore types as main rock types hosting mineralization. The C-V fractal modeling used lead, zinc and iron geochemical data to outline four types of mineralized zones, which were then compared to the mineralized rock types identified in the geological model. 'Enriched' mineralized zones contain lead and zinc values higher than 6.93% and 19.95%, respectively, with iron values lower than 12.02%. Areas where lead and zinc values were higher than 1.58% and 5.88%, respectively, and iron grades lower than 22% are labelled "high-grade" mineralized zones, and these zones are linked to massive sulfide and pyrite+dolomite lithologies of the geological model. Weakly mineralized zones, labelled 'low-grade' in the C-V model have 0-0.63% lead, 0-3.16% zinc and > 30.19% iron, and are correlated to those lithological units labeled as gangue in the geological model, including shales and dolomites, pyritized dolomites. Finally, a log-ratio matrix was employed to validate the results obtained and check correlations between the geological and fractal modeling. Using this method, a high overall accuracy (OA) was confirmed for the correlation between the enriched and highgrade mineralized zones and two lithological units -the massive sulfide and pyrite+dolomite ore types.

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“…The schists intruded by granite intrusions and in some localities overlain to the northeast by unmetamorphosed rock. Ar/Ar dating on various samples of these granitoid bodies indicate that they have emplaced in Middle to Late Cretaceous, Late Paleocene and Paleocene-Eocene [17] , but recent U-Pb analysis on zircon minerals revealed 540±10 m y for the granitoid bodies [5] . The effects of Late Cimmerian and Laramian orogenies and their related acidic plutonism, have partly obliterated all the previous events in this region, but the Early Cimmerian orogenic event has stressed as the most important metamorphic deformation event in the southeastern part of SanandajSirjan zone.…”

Section: Geologymentioning

confidence: 99%

“…Mineralization is correlates with tectonic, metamorphic and hydrothermal activities. Hassanzadeh et al [5] have been determined age of granites in the study area using zircon single crystal U-Pb geochronology as 540±10 Ma. Therefore based on contact metamorphism features in the host rock due to emplacement of these granites can conclude that the age of schists host rock is older than the granites.…”

Section: Geologymentioning

confidence: 99%

Petrography and Sulphur Isotope Studies of Pyrites in the Muteh Gold Deposit

Abdollahi¹,

Karimpour²,

Kheradmand³

2009

American J. of Applied Sciences

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Problem statement:The Muteh mining district is located in 70 km northeast of Golpaygan city within the Sanandaj-Sirjan metamorphic belt. There are 2 gold mines, 7 gold occurrences and numerous mineral indices in the Muteh gold district. There are few researches on Muteh gold district, but a detailed model is not clear yet. The aim of this study is to determine mineralogy of gold-bearing rocks and the role of these rocks in concentration of gold and to improve our knowledge about Muteh model. Approach: Detailed fieldwork carried out at different scales at the Muteh district. About 50 outcrops samples examined petrographically. Fifteen samples containing veinlets of sulfides and quartz selected for H, O and S stable isotope analysis. Petrography characterized by optical microscopy, Scanning Electron Microscopy (SEM) and X-Ray powder Diffraction (XRD) analysis. Results: Geological studies indicated that the study area show a major poly-phase metamorphism. Since the latest metamorphism was weaker than the earlier ones, the older rocks were affected by more intense metamorphism. The metamorphic rocks mainly consist of schists, quartzite, marble, amphibolite and gneisses. These rocks show two foliations (S 1 and S 2 ). The S 2 foliation is the major phase in the metamorphic rocks. Pyrite is the most abundant and the important gold-bearing mineral at the study area. Based on evidences of deformation (S 2 ) and crystallization, three main types of pyrites can be distinguished in the Muteh deposit: (1) pre-tectonic or gold bearing pyrite (2) syn-tectonic or disseminated pyrites along the foliation of the host rocks. (3) pyrite aggregates in the host rocks or in the metamorphic segregation quartz veins crosscutting the foliation of the host rocks. The sulfur isotope studies were carried out on pyrites within quartz veinlets, biotite schist and meta-volcanic rocks at the Muteh deposit. Five available data are highly variable even from the same types of hosted rocks and their 34 S are +2.2, 6.6, 9.1, 13.9 and 16.9‰. Conclusion: There are three generations of pyrite in Muteh gold district. According to isotope data, it seems that source of sulfurs were not homogenous. The values showed more than one geological event for generation of pyrites in the study area. Compositions of sulfur isotopes indicated several different sources or processes for the sulfide fluids. The sulfur of these pyrites might have derived either directly from regional metamorphism that produced the metamorphic fluid or through dissolution and leaching of pre-existing sulfide-bearing minerals.

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U-Pb zircon geochronology of late Neoproterozoic–Early Cambrian granitoids in Iran: Implications for paleogeography, magmatism, and exhumation history of Iranian basement

Cited by 306 publications

References 37 publications

Late Miocene K-rich volcanism in the Eslamieh Peninsula (Saray), NW Iran: Implications for geodynamic evolution of the Turkish–Iranian High Plateau

Late Miocene K-rich volcanism in the Eslamieh Peninsula (Saray), NW Iran: Implications for geodynamic evolution of the Turkish–Iranian High Plateau

Identification of mineralized zones in the Zardu area, Kushk SEDEX deposit (Central Iran), based on geological and multifractal modeling

Petrography and Sulphur Isotope Studies of Pyrites in the Muteh Gold Deposit

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