Petrologic and geochemical constraints on the origin of Astaneh pluton, Zagros orogenic belt, Iran

Tahmasbi, Zahra; Castro, Antonio; Khalili, Mohammad Mahdi; Khalaji, Ahmad Ahmadi; Rosa, J. de la

doi:10.1016/j.jseaes.2010.03.001

Cited by 13 publications

(7 citation statements)

References 43 publications

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“…The data for granitic rocks are taken fromAhadnejad et al (2010),Ahmadi-Khalaji et al (2007), and data for MMEs and mafic rocks are from first author's MSc and PhD thesis and,Deevsalar et al (2014). Alvand batholith(Ghalamghash et al 2009b;Shahbazi et al 2010); Aligudarz (Esna-Ashari et al 2012); Astaneh(Tahmasbi et al 2010); Siah-Kuh(Arvin et al 2007). G.En: gabbroic enclaves; Gb: gabbro; D: diorites; Gd: granodiorites; Gr: granitoids (granodiorite to syenogranites); MME: microgranular enclaves.…”

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Subduction-related mafic to felsic magmatism in the Malayer–Boroujerd plutonic complex, western Iran

et al. 2018

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Subduction-related mafic to felsic magmatism in the Malayer–Boroujerd plutonic complex, western Iran

et al. 2018

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“…Harker variation diagram of some major oxide and trace element contents for the SIC (symbols as for Figure 4). (Shahbazi et al 2010) and Astaneh dacite (Tahmasbi et al 2010). Isotopic ratios of plutonic rocks of Suffi Abad granites, Alvand granites, Boroujerd diorite-granodiorite, and Aligoodarz diorite-granite are different from the study pluton ( Figure 8).…”

Section: Isotope Geochemistrymentioning

confidence: 72%

“…The more evolved samples (S82 and S105) are systematically enriched and are plotted on the right-hand side of the mantle array. The SIC isotopic data are compared with the data of Cretaceous plutonic rocks from the SSZ (Ahmadi- Khalaji et al 2007;Shahbazi et al 2010;Tahmasbi et al 2010;Azizi et al 2011;Esna-Ashari et al 2011), with which this pluton may share a common mantle source. The isotopic data of the SIC rocks are similar to isotopic data reported from Alvand Cretaceous gabbro SiO (wt.%) Figure 6.…”

Section: Isotope Geochemistrymentioning

confidence: 99%

“…Locations of depleted mantle (DM) and enriched mantles (EMI) are from Zindler and Hart (1986). The samples from other Mesozoic magmatic suites (in the northernmost part of the Sanandaj-Sirjan zone) are also plotted for comparison, including the Alvand Cretaceous gabbro-granite (Shahbazi et al 2010), Astaneh dacites (Tahmasbi et al 2010), Boroujerd diorite-granodiorite (Ahmadi-Khalaji et al 2007), Aligoodarz diorite-granite (Esna-Ashari et al 2011), and Suffi Abad granite (Azizi et al 2011). the ideal fit; R 2 < 1.5 was considered to be acceptable. Major element modelling suggests that the S220 can be produced by 17.1% fractional crystallization of 47.08% plagioclase, 29.99% clinopyroxene, 10.51% ortopyroxene, and 12.43% magnetite from the S223 (Table 3).…”

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Mafic–intermediate plutonic rocks of the Salmas area, northwestern Iran: their source and petrogenesis significance

Ghaffari

Rashidnejad‐Omran

Dabiri

et al. 2013

International Geology Review

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The Salmas area, in the northernmost part of the Sanandaj-Sirjan zone of Iran, contains a crystalline mafic-intermediate complex that intrudes into the Precambrian metamorphic basement complex and is composed of gabbroic and gabbrodiorite cumulates and fine-grained non-cumulate gabbronorites and diorites. These rocks have fine-to coarse-grained texture and are mainly composed of plagioclase, pyroxenes, and amphibole. Major element geochemistry indicates that the pluton has a low-K with tholeiitic affinity. Variations of major and trace elements on Harker diagrams, including negative correlations MgO, Fe 2 O 3 , CaO, and Co and positive correlations Na 2 O, K 2 O, Rb, Ba, and La, with increasing SiO 2 and chondrite-normalized REE patterns, suggest that fractional crystallization of gabbroic rocks could have played a significant role in the formation of evolved rocks. The chondrite-normalized REE patterns are not fractionated (La N /Lu N = 1.3-5.4) and display strong Eu anomalies (Eu/Eu * = 1.15-1.76) in cumulate rocks, which we attributed to cumulus plagioclase. Sr and Nd isotopic ratios vary from 0.704698 to 0.705866 and from 0.512548 to 0.512703, respectively. Gabbronorites with high 143 Nd/ 144 Nd ratios, low 87 Sr/ 86 Sr ratios, and high MgO, Ni, and Cr contents indicate that they were generated from relatively primitive magmas. We used petrogenetic modelling to constrain sources. Trace element ratio modelling indicates that the gabbroic rocks were generated from a spinel-peridotite source via 5-20% degrees of fractional melting at a depth of ∼52 km. Major and REE modelling shows that the diorites are the products of fractional crystallization of gabbronorites.

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“…AJT: Anarak-Jandaq terrane; Al: Alborz; BGC (Bazman granitoid complex); Bz: Bazman volcano; EIR: Eastern Iranian Ranges; Gb: Great Kavir Block; Kd: Kopeh Dagh; Ks: Kuh-e-Sultan; Lu: Lut Block; Mp: Makran accretionary prisms; Pb: Poshteh-e-Badam terrane; SSZ: Sannadaj-Sirjan Zone; Tb: Tabas Block; Tf: Taftan Volcano; UDB: Urumieh-Dokhtar volcano-plutonic belt, Yz: Yazd Block; Za: Zagros fold and thrust belt. 1: Urumieh plutonic complex (Ghalghamash et al, 2009); 2: Astaneh pluton (Tahmasbi et al, 2010); 3: Alvand plutonic complex (Shahbazi et al, 2010); 4: Borojerd granitoid (Ahmadi Khalaji et al, 2007); 5: Shir-Kuh granite (Sheibi et al, 2011); 6: Sirjan granitoid; 7: Bajestan granitoid (Karimpour et al, 2011); 8: Shah Kuh granitoid (Esmaeily et al, 2005); 9: BGC; 10: Band-e-Zyarat ophiolite; 11: Dehshir-Baft ophiolite.…”

Section: Introductionmentioning

confidence: 99%

Geochemistry, zircon U-Pb age, and tectonic constraints on the Bazman granitoid complex, southeast Iran

Boomeri¹,

Bagheri²,

Ishiyama³

et al. 2016

Turkish J Earth Sci

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The Bazman granitoid complex (BGC), including a large zoned pluton, intrudes into the upper Paleozoic sedimentary cover of the Lut block. It crops out on the southern slope of the Bazman volcano in Baluchestan Province of Iran. The intrusive rocks range from gabbro to various metaluminous to weakly peraluminous granites, and they are classified as I-type magmatic series. They display geochemical characteristics of typical volcanic arc magmatism at continental margins. Major-and trace-element variation diagrams show that fractional crystallization was the major process and crustal contamination, a subordinate process during the evolution of the BGC. The decrease in CaO, MgO, Al 2 O 3 , Fe 2 O 3 , TiO 2 , P 2 O 5 , and Sr, as well as the increase of K 2 O and Rb with increasing silica, are possibly related to the fractionation of plagioclase, hornblende, apatite, and titanite, whereas the increasing K, Rb, Cs, Pb, and light rare earth elements (LREEs) can be explained by crustal contamination. The BGC rocks are enriched by large ion lithophile elements (e.g., Rb, K, Cs) and the LREEs with respect to the high field strength elements (e.g., Zr, Hf, Nb, Ta, Y) and heavy rare earth elements. New ID-TIMS U-Pb dating performed on zircon and titanite extracted from the granitic samples indicates that the BGC was emplaced during the late Cretaceous period at 83-72 Ma by subduction of the Neo-Tethyan oceanic crust beneath the Eurasian continent. Subsequently, the complex became part of the Lut block when it probably rotated counter-clockwise with respect to the Sanandaj-Sirjan zone and the Urumieh-Dokhtar volcano-plutonic belt.

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Petrologic and geochemical constraints on the origin of Astaneh pluton, Zagros orogenic belt, Iran

Cited by 13 publications

References 43 publications

Subduction-related mafic to felsic magmatism in the Malayer–Boroujerd plutonic complex, western Iran

Subduction-related mafic to felsic magmatism in the Malayer–Boroujerd plutonic complex, western Iran

Mafic–intermediate plutonic rocks of the Salmas area, northwestern Iran: their source and petrogenesis significance

Geochemistry, zircon U-Pb age, and tectonic constraints on the Bazman granitoid complex, southeast Iran

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