Evidence for multi-stage mantle metasomatism at the Dehsheikh peridotite massif and chromite deposits of the Orzuieh coloured mélange belt, southeastern Iran

Peighambari, Sima; Ahmadipour, Hamid; Stosch, H.-G.; Daliran, Farahnaz

doi:10.1016/j.oregeorev.2011.03.004

Cited by 17 publications

(25 citation statements)

References 54 publications

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“…Podiform chromitites are common within the dunites. Lherzolites occur as small‐sized, reddish‐brown outcrops at the northern part of the belt (Peighambari et al ., ). Clinopyroxenitic and dunitic dikes are common within the mantle tectonites.…”

Section: Lithology and Mineral Assemblages Of Ophiolitic Unitsmentioning

confidence: 97%

“…The olivines also display affinity with the Thetford Mines forearc peridotite. Olivines with higher Fo (92‐96%) and NiO contents (>0.5 to 0.9%) have been also reported from the Haji‐Abad chromitites (Peighambari et al ., ).…”

Section: Mineral Composition Of Mantle Tectonitesmentioning

confidence: 97%

“…The harzburgite orthopyroxenes with low Al 2 O 3 , Cr 2 O 3 , TiO 2 and Na 2 O are similar to those of fore‐arc peridotite (Fig. A, B), whereas some exceptions with slightly higher content of these elements are suggested to be products of mantle metasomatism (Peighambari et al ., ). Most of the orthopyroxenes from the OB and IB peridotite have low Al 2 O 3 (<4 wt.%) and CaO (<2.2 wt.%), resembling depleted harzburgites from modern fore‐arcs (Fig.…”

Section: Mineral Composition Of Mantle Tectonitesmentioning

confidence: 97%

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Geochemistry and petrogenesis of the Late Cretaceous Haji‐Abad ophiolite (Outer Zagros Ophiolite Belt, Iran): implications for geodynamics of the Bitlis–Zagros suture zone

2012

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The Haji‐Abad ophiolite in SW Iran (Outer Zagros Ophiolite Belt) is a remnant of the Late Cretaceous supra‐subduction zone ophiolites along the Bitlis–Zagros suture zone of southern Tethys. These ophiolites are coeval in age with the Late Cretaceous peri‐Arabian ophiolite belt including the Troodos (Cyprus), Kizildag (Turkey), Baer‐Bassit (Syria) and Semail (Oman) in the eastern Mediterranean region, as well as other Late Cretaceous Zagros ophiolites. Mantle tectonites constitute the main lithology of the Haji‐Abad ophiolite and are mostly lherzolites, depleted harzburgite with widespread residual and foliated/discordant dunite lenses. Podiform chromitites are common and are typically enveloped by thin dunitic haloes. Harzburgitic spinels are geochemically characterized by low and/or high Cr number, showing tendency to plot both in depleted abyssal and fore‐arc peridotites fields. Lherzolites are less refractory with slightly higher bulk REE contents and characterized by 7–12% partial melting of a spinel lherzolitic source whereas depleted harzburgites have very low abundances of REE and represented by more than 17% partial melting. The Haji‐Abad ophiolite crustal sequences are characterized by ultramafic cumulates and volcanic rocks. The volcanic rocks comprise pillow lavas and massive lava flows with basaltic to more‐evolved dacitic composition. The geochemistry and petrology of the Haji‐Abad volcanic rocks show a magmatic progression from early‐erupted E‐MORB‐type pillow lavas to late‐stages boninitic lavas. The E‐MORB‐type lavas have LREE‐enriched patterns without (or with slight) depletion in Nb–Ta. Boninitic lavas are highly depleted in bulk REEs and are represented by strong LREE‐depleted patterns and Nb–Ta negative anomalies. Tonalitic and plagiogranitic intrusions of small size, with calc‐alkaline signature, are common in the ophiolite complex. The Late Cretaceous Tethyan ophiolites like those at the Troodos, eastern Mediterranean, Oman and Zagros show similar ages and geochemical signatures, suggesting widespread supra‐subduction zone magmatism in all Neotethyan ophiolites during the Late Cretaceous. The geochemical patterns of the Haji‐Abad ophiolites as well as those of other Late Cretaceous Tethyan ophiolites, reflect a fore‐arc tectonic setting for the generation of the magmatic rocks in the southern branch of Neotethys during the Late Cretaceous. Copyright © 2012 John Wiley & Sons, Ltd.

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Section: Lithology and Mineral Assemblages Of Ophiolitic Unitsmentioning

confidence: 97%

Section: Mineral Composition Of Mantle Tectonitesmentioning

confidence: 97%

Section: Mineral Composition Of Mantle Tectonitesmentioning

confidence: 97%

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Geochemistry and petrogenesis of the Late Cretaceous Haji‐Abad ophiolite (Outer Zagros Ophiolite Belt, Iran): implications for geodynamics of the Bitlis–Zagros suture zone

2012

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“…Dehsheikh (Peighambari et al, 2011) and Abdasht (Jannessary et al, 2012;Najafzadeh and Ahmadipour, 2014b)) with total probable reserves of 8 million tonnes of chromite ores grading 41 percent Cr 2 O 3 . The…”

Section: Introductionmentioning

confidence: 99%

Geochemistry of platinum-group elements and mineral composition in chromitites and associated rocks from the Abdasht ultramafic complex, Kerman, Southeastern Iran

Najafzadeh

Ahmadipour

2016

Ore Geology Reviews

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“…Consequently, mantle peridotites can be used as natural laboratories that may help us to understand the nature of rather complex processes such as partial melting, depletion and melt extraction that essentially take place within the upper mantle (e.g. Caran et al, 2010;Peighambari et al, 2011;Uysal et al, 2013;Saka et al, 2014). Combined petrographic and geochemical studies confirm that such processes are responsible for the heterogeneous character of the mantle at various scales (e.g.…”

Section: Introductionmentioning

confidence: 99%

Mineralogy, geochemistry and geotectonic significance of harzburgites from the southern Dramala upper mantle suite, Pindos ophiolite complex, NW Greece

Kapsiotis

2014

Geological Journal

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The Dramala massif, located in the Dinarides–Hellenides orogenic belt, forms the mantle section of the Neotethyan Pindos ophiolite complex in NW continental Greece. Its southern domain is comprised mainly of voluminous harzburgite masses with variable clinopyroxene and olivine modal abundances, ranging from clinopyroxene‐bearing to typical and olivine‐rich harzburgites. The harzburgite varieties are characterized by elevated Cr# [Cr/(Cr + Al)] in Cr‐spinel (0.43–0.79), high forsterite (Fo) content in olivine (0.90–0.93), low Al2O3 content in clinopyroxene (≤1.77 wt.%) and poor whole‐rock abundances of Al2O3 (≤0.68 wt.%), CaO (≤0.68 wt.%), Sc (≤11 ppm) and REE, which are indicative of their refractory nature. In terms of fO2 values, the southern Pindos harzburgites plot between the FMQ‐2 (Fayalite–Magnetite–Quartz) and FMQ + 2 buffers. Simple batch and fractional melting models are not sufficient to explain their depleted composition. Their Ni/Yb ratios vs. Yb bulk‐rock abundances can be reproduced by up to 22–31% closed‐system non‐modal dynamic melting of an assumed spinel‐bearing lherzolite source. Cr‐spinel chemistry data suggest that the southern Dramala harzburgites were formed in an oceanic centre and then were reworked in the mantle wedge above a subducted slab. Combined petrographic and compositional data indicate that the studied harzburgites interacted with arc‐derived tholeiitic melts. This interaction resulted in substantial olivine and minor Cr‐spinel addition to the studied harzburgites, thus enhancing their refractoriness. Cryptic metasomatism was plausibly responsible for the demolition of any strong geochemical signatures suggestive of a previous melting event in a spreading centre. Comparable observations from the neighbouring Vourinos suite imply that the southern Dramala harzburgites probably represent an arc/fore‐arc mantle region within the mutual Pindos–Vourinos, Mesohellenic lithospheric mantle. Copyright © 2014 John Wiley & Sons, Ltd.

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Evidence for multi-stage mantle metasomatism at the Dehsheikh peridotite massif and chromite deposits of the Orzuieh coloured mélange belt, southeastern Iran

Cited by 17 publications

References 54 publications

Geochemistry and petrogenesis of the Late Cretaceous Haji‐Abad ophiolite (Outer Zagros Ophiolite Belt, Iran): implications for geodynamics of the Bitlis–Zagros suture zone

Geochemistry and petrogenesis of the Late Cretaceous Haji‐Abad ophiolite (Outer Zagros Ophiolite Belt, Iran): implications for geodynamics of the Bitlis–Zagros suture zone

Geochemistry of platinum-group elements and mineral composition in chromitites and associated rocks from the Abdasht ultramafic complex, Kerman, Southeastern Iran

Mineralogy, geochemistry and geotectonic significance of harzburgites from the southern Dramala upper mantle suite, Pindos ophiolite complex, NW Greece

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