Compositional characteristics and geodynamic significance of late <scp>M</scp>iocene volcanic rocks associated with the <scp>C</scp>hah <scp>Z</scp>ard epithermal gold–silver deposit, southwest <scp>Y</scp>azd, <scp>I</scp>ran

Kouhestani, Hossein; Ghaderi, Majid; Emami, Mohammad Hashem; Meffre, Sébastien; Kamenetsky, Vadim S.; McPhie, Jocelyn; Zaw, Khin; Bezenjani, Rasoul Nasiri

doi:10.1111/iar.12223

Cited by 12 publications

(2 citation statements)

References 185 publications

(362 reference statements)

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“…Slab break-off had led to thermal perturbation by upwelling of hot asthenosphere which has prepared the appropriate conditions for partial melting of amphibolite or eclogite from detached subducting slab Martin, 2005) to produce adakitic magmas (Ahmadzadeh et al, 2010;Azizi et al, 2014;Ghadami et al, 2008;Ghasemi and Talbot, 2006;Kouhestani et al, 2017;Omrani et al, 2008). Subsequently the adakitic liquids metasomatized mantle wedge for a long period of time.…”

Section: Geodynamic Implicationsmentioning

confidence: 99%

Petrology and geochemistry of Plio-Quaternary high-Nb basalts from Shahr-e-Babak area:Insights into post-collision magmatic processes in the Kerman Cenozoic Magmatic Arc

Moradi

Khaksar

Nazarinia

et al. 2022

GeA

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Post-collision Pliocene-Quaternary basaltic rocks outcrop in the Kerman Cenozoic Magmatic Arc (KCMA) to the northwest and east of Shahr-e-Babak city. These porphyritic and vesicular basaltic rocks are composed essentially of clinopyroxene, olivine, and plagioclase. These basalts display alkaline affinity and negative Ta, Zr, Rb anomaly, but slightly negative Nb anomaly, relative to elements with similar compatibility, and positive Ba, K, Sr anomaly, suggesting their magma source related to subduction-accretion with implication of subducted slab derived components to the source. In the primitive mantle and chondrite normalized diagrams, these rocks show trace elements (except depletion in Nb, Ta) and Rare Earth Element (REE) patterns similar to the Ocean Island Basalts (OIB) and share trace and major element characteristics similar to High-Nb Basalts (HNBs). Geochemical analyses for major and trace elements suggest that the Shahr-e-Babak HNBs have undergone insignificant crustal contamination and minor olivine + Fe-Ti oxide ±clinopyroxene fractional crystallization. These HNBs derived from a partial melting (~5%) of garnet-peridotite mantle wedge, which have already metasomatized by overlying sediments, fluids, and adakitic (slab-derived) melts as major metasomatic agents in post-collision setting in the KCMA. We conclude that asthenospheric upwelling arising from slab break-off followed by the roll-back of subducting Neotethys slab also triggered metasomatized peridotite mantle wedge and caused its partial melting in the subduction zone.

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Section: Geodynamic Implicationsmentioning

confidence: 99%

Petrology and geochemistry of Plio-Quaternary high-Nb basalts from Shahr-e-Babak area:Insights into post-collision magmatic processes in the Kerman Cenozoic Magmatic Arc

Moradi

Khaksar

Nazarinia

et al. 2022

GeA

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“…As noted earlier, the elemental trends shown by the samples are consistent with fractionation of ferromagnesian silicates, plagioclase, Fe-Ti oxides (and/or titanite) and apatite, presumably with zircon and/or xenotime joining the fractionating assemblage at a late stage (Figures 7, 8). Fractionation in a closed system, however, cannot explain the (Omrani et al, 2008), Kerman (DBB intrusions, Dargahi et al, 2010), Nain (Yeganehfar et al, 2013), Kuh-e Dom (Sarjoughian et al, 2012;Kananian et al, 2014), Kal-e-Kafi (Ahmadian et al, 2016), Chah Zard (Kouhestani et al, 2017), Saveh (Nouri et al, 2018), and Zafarghand (Sarjoughian et al, 2018). Also shown are AFC trajectories assuming sample I-10, which has the lowest 87 Sr/ 86 Sr 25Ma and εNd 25Ma among the studied samples, underwent concurrent fractional crystallization and assimilation of different crustal rocks from the ChahJam-Biarjmand metamorphic complex, Iran (Shafaii Moghadam et al, 2015): metagranite (sample BJ10-20, gray), paragneiss (sample CHJ09-12, deep blue), and granitic gneiss (sample CHJ09-18, light blue).…”

Section: Petrogenetic Constraintsmentioning

confidence: 99%

Petrogenesis of the Late Oligocene Takht batholith, Southeastern Iran: Implications for the Diachronous Nature of the Arabia–Eurasia Collision

Pang

Fazlnia

et al. 2020

Front. Earth Sci.

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Zircon U-Pb age, mineral compositional, elemental and Sr-Nd isotopic data are documented for intermediate to felsic rocks in the Takht batholith, a Late Oligocene igneous complex in the southeastern segment of the Urumieh-Dokhtar belt, Iran, to investigate magma genesis in the context of regional tectonics. A large part of the magmatic belt formed by northward subduction of the Neotethys before the Arabia-Eurasia continental collision. Zircon U-Pb age data indicate the batholith crystallized at ∼25 Ma, an age consistent with previous results. Geochemical data indicate that the rocks share features typical of calc-alkaline magmas and I-type granitoids. The least evolved magma inferred from the data has basaltic andesite composition, consistent with either of the following origins: (i) a partial melt of the mantle followed by differentiation, or (ii) a partial melt of the lower crust. With increasing SiO 2 , ( 87 Sr/ 86 Sr) 25Ma increases from 0.7053 to 0.7073, and εNd 25Ma decreases from −0.3 to −2.9, consistent with increasing effects of assimilation-fractional crystallization, although processes such as magma mixing and melting of heterogeneous source rocks cannot be entirely ruled out. Aluminum-in-hornblende thermometry indicates that the batholith might have emplaced at ∼6.5 km or shallower paleo-depths. Moho depth proxies Sr/Y and (La/Yb) N yield crustal thickness of ∼20-30 km, showing no evidence for magma processing within thick crust. Overall, our results indicate that the Takht batholith is a Cordilleran-type batholith formed beneath a continental or transitional arc of normal crustal thickness. This is consistent with the notion that Arabia and Eurasia have collided in a diachronous manner, propagating from the northwest to the southeast since the Late Eocene-Early Oligocene.

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Introduction

Müller¹,

Groves²

2018

Potassic Igneous Rocks and Associated Gold-Copper Mineralization

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Compositional characteristics and geodynamic significance of late Miocene volcanic rocks associated with the Chah Zard epithermal gold–silver deposit, southwest Yazd, Iran

Abstract: K E Y W O R D SAdakite, Chah Zard, epithermal gold, Iran, slab break-off, Sr-Nd isotope, subduction

Cited by 12 publications

References 185 publications

Petrology and geochemistry of Plio-Quaternary high-Nb basalts from Shahr-e-Babak area:Insights into post-collision magmatic processes in the Kerman Cenozoic Magmatic Arc

Petrology and geochemistry of Plio-Quaternary high-Nb basalts from Shahr-e-Babak area:Insights into post-collision magmatic processes in the Kerman Cenozoic Magmatic Arc

Petrogenesis of the Late Oligocene Takht batholith, Southeastern Iran: Implications for the Diachronous Nature of the Arabia–Eurasia Collision

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