The granite pluton of Zahedan (SE Iran): a petrological and magnetic fabric study of a syntectonic sill emplaced in a transtensional setting

Sadeghian, Mahmoud; Bouchez, Jean‐Luc; Nédélec, Anne; Siqueira, Roberto; Valizadeh, M V

doi:10.1016/j.jseaes.2004.03.001

Cited by 11 publications

(13 citation statements)

References 35 publications

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“…In this context, numerous studies address the problem of significance of magmatic fabrics for regional kinematic reconstructions and exhumation of deep crust [e.g., Lacroix et al , 1998; Wilson and Grocott , 1999]. Despite the existence of numerous studies dealing with emplacement of granites in an extensional and/or transtensional context [e.g., Ayoa et al , 2005; Sadeghian et al , 2005], the interplay between magmatic and tectonic processes during pluton ascent and emplacement remains a subject of wide discussion [e.g., Žák and Paterson , 2005; Weinberg et al , 2004]. The review of Paterson et al [1998] on magma fabrics in plutons argued that the preserved fabric pattern is mostly formed after chamber construction thereby providing little information about the ascent and emplacement of magma.…”

Section: Introductionmentioning

confidence: 99%

Model of successive granite sheet emplacement in transtensional setting: Integrated microstructural and anisotropy of magnetic susceptibility study

Kratinová

Schulmann²,

Edel

et al. 2007

Tectonics

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[1] This study presents a model of successive emplacement of three granite plutons in transtensional deformation regime controlled by the preextensional synconvergent history of the lower and middle crust in the central Vosges Mountains (France). The complex compressional orogenic structure recorded a vertical exhumation-related fabric in midcrustal levels which was overprinted by the regional extension. Three successively emplaced granite sheets exploited the inherited vertical anisotropy obliquely oriented with respect to the applied tensile stress. This progressive opening of original steep fabric leads to the sequential generation of free spaces toward the south, and emplacement and deformation of granite sheets. Repeated granite intrusions are responsible for reheating of southern margins of the already partially solidified granites, which became reactivated under lower ambient thermal conditions related to overall $6 Ma cooling of rapidly exhumed crust. The results of anisotropy of magnetic susceptibility (AMS) fabric modeling suggest a highly partitioned oblique extension divided into pure shear-dominated deformation close to the central and northern margins of intrusions and wrenchdominated shear along the southern margins. The AMS modeling suggests the importance of overprinting of the intrusive fabrics by the transtensional deformation.

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Section: Introductionmentioning

confidence: 99%

Model of successive granite sheet emplacement in transtensional setting: Integrated microstructural and anisotropy of magnetic susceptibility study

Kratinová

Schulmann²,

Edel

et al. 2007

Tectonics

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“…2007). These shear zones formed as a result of the collision of the Lut block in the west with the Afghan block in the east after the middle Eocene (Sadeghian et al. 2005).…”

Section: Discussionmentioning

confidence: 99%

“…The plutons have been partially deformed at their margins. Andesitic and dacitic porphyry dykes intrude both into the granitoid plutons and metasedimentary rocks (Sadeghian et al. 2005).…”

Section: Introductionmentioning

confidence: 99%

“…Most authors believe that Oligo–Miocene igneous rocks of the Zahedan–Saravan granitoids are arc‐type intrusive rocks which have been generated during the northeastward Lut block subduction beneath the Afghan block (Stocklin 1968; Tirrul et al. 1983; Sadeghian et al. 2005).…”

Section: Introductionmentioning

confidence: 99%

“…2005). The Zahedan–Saravan granitoids have a subduction signature inherited from a crustal melting during heat transferring from the mantle to the crust by mantle wedge‐derived magma, or from mantle‐derived mafic magmas mixing with crustal‐derived felsic magmas (Sadeghian et al. 2005).…”

Section: Introductionmentioning

confidence: 99%

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Geochemistry of the Zargoli granite: Implications for development of the Sistan Suture Zone, southeastern Iran

et al. 2010

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The Zargoli granite, which extends in a northeast-southwest direction, intrudes into the Eocene-Oligocene regional metamorphic flysch-type sediments in the northwest of Zahedan. This pluton, based on modal and geochemical classification, is composed of biotite granite and biotite granodiorite, was contaminated by country rocks during its emplacement, and is slightly changed to more aluminous. The SiO 2 content of these rocks range from 62.4 to 66 wt% with an alumina saturation index of Shand [molar Al 2 O 3 / (CaO + Na 2 O + K 2 O)]~1.1. Most of its chemical variations could be explained by fractionation or heterogeneous distribution of biotite. The features of the rocks resemble those which are typical to post-collisional granitoids. Chondrite-normalized rare-earth element patterns of these rocks are fractionated at (La/Lu) N = 2.25-11.82 with a pronounced negative Eu anomaly (Eu/Eu* = 3.25-5.26). Zircon saturation thermometry provides a good estimation of magma temperatures (767.4-789.3°C) for zircon crystallization. These characteristics together with the moderate Mg# [100Mg/(Mg + Fe)] values (44-55), Fe + Mg + Ti (millications) = 130-175, and Al-(Na + K + 2Ca) (millications) = 5-50 may suggest that these rocks have been derived from the dehydration partial melting of quartzfeldspathic meta-igneous lower crust.

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On the magmatic record of the Makran arc, southeastern Iran: Insights from zircon U‐Pb geochronology and bulk‐rock geochemistry

Pang

Chung

Zarrinkoub

et al. 2014

Geochem Geophys Geosyst

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Twenty-one magmatic rocks were analyzed for major and trace elements, and a subset of them for Sr-Nd isotopes and zircon U-Pb isotopes, to constrain magma genesis and tectonic evolution of the Makran arc, southeastern Iran. Representative samples from the Bazman and Taftan volcanoes yield zircon U-Pb ages from 0.84 to 7.5 Ma, consistent with published ages ranging from the Late Miocene to Late Pleistocene. The Mirabad granitic pluton adjacent to and geochemically similar to the Taftan volcano was dated at 19 Ma, indicating that arc magmatism might have started earlier than commonly thought in the Early Miocene. The studied rocks show basaltic to rhyolitic compositions, calc-alkaline affinity, and an orogenic signature involving enrichments in large ion lithophile elements, light rare earth elements, Th and Pb, and depletions in high field strength elements and P, relative to elements of similar incompatibilities. The trace element ratios in a subset of relatively primitive samples are consistent with derivation from a mantle source that underwent subduction-related enrichment. The covariations of Sr and Nd isotopic ratios, and of these ratios and MgO and SiO 2 , are consistent with combined assimilation and fractional crystallization. The process is modeled using covariations of 87 Sr/ 86 Sr and Sr concentration in the studied rocks given that Sr behaves as neutral or slightly incompatible. We propose, in light of published and our new data, that the Makran represents a window of continental collision between the India-Eurasia collision zone to the east and the Arabia-Eurasia collision zone to the west.

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The granite pluton of Zahedan (SE Iran): a petrological and magnetic fabric study of a syntectonic sill emplaced in a transtensional setting

Cited by 11 publications

References 35 publications

Model of successive granite sheet emplacement in transtensional setting: Integrated microstructural and anisotropy of magnetic susceptibility study

Model of successive granite sheet emplacement in transtensional setting: Integrated microstructural and anisotropy of magnetic susceptibility study

Geochemistry of the Zargoli granite: Implications for development of the Sistan Suture Zone, southeastern Iran

On the magmatic record of the Makran arc, southeastern Iran: Insights from zircon U‐Pb geochronology and bulk‐rock geochemistry

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