Geochemical characteristics of mafic and ultramafic plutonic rocks in southern Caspian Sea Ophiolite (Eastern Guilan)

Salavati, Mojgan; Kananian, Ali; Noghreyan, Moussa

doi:10.1007/s12517-012-0688-1

Cited by 8 publications

(3 citation statements)

References 22 publications

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“…The Cre ta ceous magmatism in the Alborz zone is en visaged as the prod uct of a ten sional/back-arc ba sin by many research ers (e.g., Alavi, 1996;Allen et al, 2006) or as parts of an ophiolitic se quence that formed in slow-spread ing mid-oce anic ridges (Salavati et al, 2013). On the other hand, a within-plate con ti nen tal rift has been pos tu lated by Haghnazar and Malakotian (2009), Haghnazar (2012) and Haghnazar et al (2015) for the same vol ca nic suc ces sion.…”

Section: Discussionmentioning

confidence: 99%

“…2) in the DIC con sists of ma jor geo log i cal units of ba saltic pil low and sheet 5; ab bre vi a tions: AFC -as sim i la tion-frac tional crys tal li za tion, FC -frac tional crys tal li za tion, MORB -mid-ocean ridge bas alts, OIB-CE -ocean-is land type en rich ment, PM -prim i tive man tle, SSZ-E -su pra-subduction zone en rich ment, VAB -vol ca nic arc bas alts, WPB -within-plate bas alts lavas, pe lagic fos sil-bear ing de pos its and also monzodio ritegab bro bod ies. A sim i lar suc ces sion in the neigh bor ing area has been called a "South ern Cas pian Sea ophiolite" by Salavati et al (2013). How ever, the DIC can not be taken in con sid eration as an ophiolitic com plex, be cause it lacks some of the diag nos tic fea tures such as sheeted dykes and ultra mafic rocks, or these may be hid den be low the up per units.…”

Section: Volcano-sedimentary Environmentmentioning

confidence: 99%

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Cretaceous magmatic evolution in the Deylaman igneous complex, Alborz zone, Iran: change from extensional to compressional regime

Akmali

Asiabanha

Haghnazar

2019

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As so ci ate ed i tor: Tomasz Bajda The Deylaman ig ne ous com plex, as a part of the Late Cre ta ceous rock unit that lies be hind the Paleogene Alborz mag matic arc, in the north ern Alborz zone, is com posed of ba saltic sheet lavas al ter nat ing with the pe lagic cal car e ous sed i ments, basaltic pil low lavas, fel sic lavas and gabbroic-monzodioritic in tru sions. The pe lagic cal car e ous de pos its con tain microfossils rep re sent ing the Santonian-Maastrichtian ages. Fur ther more, petrographic tex tures such as the hyalomicrolitic tex ture and swal low-tail plagioclase crys tals in the pil low lavas, and also seg re ga tion ves i cles in the ba saltic sheet lavas, im ply high exter nal (hy dro static) pres sures as the magma was ex truded in a deep-wa ter en vi ron ment. The rock sam ples show both compositional bimodality and char ac ter is tic trends in the vari a tion di a grams. Also, some geo chem i cal char ac ter is tics im ply that the ba saltic lavas orig i nated from the par tial melt ing of an undepleted deep man tle source con tain ing spinel lherzolite: the en rich ment pat terns of LREE/HREE ra tios of the sam ples [(La/Yb)n = 3.93-4.16 for ba saltic lavas and 10.92 for fel sic lavas] ly ing be tween those char ac ter is tic of OIBs [(La/Yb)n = 12.92] and EMORBs [(La/Yb)n = 1.91]; sim i lar i ties be tween the pat terns of multi-el e ment spi der-di a grams; LILE bulges in the ba saltic sam ples com pared with those of OIBs. More over, the sam ples show in flu ence from two geotectonic en vi ron ments: su pra-subduction zone (SSZ) set tings and plume-type within-plate mag mas. There fore, be cause of the deep sub ma rine en vi ron ment in ferred for the ef fu sive vol ca nic erup tions in Santonian-Maastrichtian time, it seems that the Deylaman ig ne ous com plex evolved through two stages: first, a ten sional re gime in a su pra-subduction zone (far ther from the Me so zoic mag matic arc) and for ma tion of an em bry onic rift-re lated oceanic ba sin in the Late Ju ras sic-Early Cre ta ceous; sec ondly, a com pres sive re gime in the Late Cre ta ceous-Early Paleocene and in land mi gra tion of the mag matic arc. Con se quently, the Cre ta ceous magmatism can be in ter preted as a pre lude to the Eocene mag matic flare-up in the mag matic arcs of Iran.

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Section: Discussionmentioning

confidence: 99%

Section: Volcano-sedimentary Environmentmentioning

confidence: 99%

Cretaceous magmatic evolution in the Deylaman igneous complex, Alborz zone, Iran: change from extensional to compressional regime

Akmali

Asiabanha

Haghnazar

2019

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“…Slab dehydration occurs at shallower depths as compared to slab melting (Rollinson and Tarney 2005) and this dehydration promotes partial melting of the mantle wedge under high P H2O conditions. As a result, produced melts have high concentrations of mobile elements (LILEs and LREEs) as compared to immobile elements (HFSEs) because these immobile elements are retained in stable phases such as sphene, rutile, and zircon (Wallin and Metcalf 1998;Dawoud et al 2006;Salavati et al 2013). Therefore, observed enrichment of Rb, Th, U, Pb, Sr, and LREEs and depletion of HFSEs (Fig.…”

Section: Modification Of Mantle Source (Mantle Wedge) By Slab-derivedmentioning

confidence: 98%

Boninitic geochemical characteristics of high-Mg mafic dykes from the Singhbhum Granitoid Complex, Eastern India

2015

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The high-Mg mafic dykes from the Singhbhum Granitoid Complex in East India have geochemical characteristics [e.g., enrichment of the large ion lithophile elements and light rare earth elements (LREEs) relative to high field strength elements (HFSEs): high-MgO ([8 %), high-SiO 2 (C52 %), low-TiO 2 (B0.5 %), and high CaO/Al 2 O 3 (C0.58)] similar to those found in boninitic/noritic rocks. Their high percentage of orthopyroxene as a mafic mineral and of plagioclase as a felsic mineral, and normative hypersthene content greater than diopside content are also indications of their boninitic/noritic affinity. On a triangular diagram of MgO-CaO-Al 2 O 3 and on binary diagrams of Ti/V vs Ti/Sc and TiO 2 vs Zr, these samples show geochemical similarities with Phanerozoic boninites and Paleoproterozoic high-Mg norites. On major and trace element variation diagrams, these dykes show a normal crystallization trend and their Nb/La (\0.5) and Nb/Ce (\0.21) values lower than average bulk crust (0.69 and 0.33, respectively) suggest no crustal contamination. Their low values of Rb/Sr (0.11-0.41) and Rb/Ba (0.10-0.27) also suggest little or no effect of post magmatic processes. Their TiO 2 (0.27-0.50), Al 2 O 3 /TiO 2 (19.30-42.48), CaO/TiO 2 (12.96-32.52), and Ti/V (12-18) values indicate derivation from a depleted mantle source under oxidizing conditions such as a mantle wedge. Ni vs Zr modeling shows that the studied high-Mg dykes were generated by 25-30 % melting of a refractory mantle source. Enrichment of Rb, Th, U, Pb, Sr, and LREEs, and depletion of HFSEs-especially Nb, P, Ti, Zr-on primitive mantleand chondrite-normalized spider diagrams, respectively, are clear signals that the slab-derived component played an important role in the formation of melts for these rocks in a supra-subduction zone setting.

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Geochemistry and tectono-magmatic setting of OIT plutonic gabbros in Northern Iran: New evidence for the Oceanic Plume magmatism in the Southern Caspian Sea

2022

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Geochemical characteristics of mafic and ultramafic plutonic rocks in southern Caspian Sea Ophiolite (Eastern Guilan)

Cited by 8 publications

References 22 publications

Cretaceous magmatic evolution in the Deylaman igneous complex, Alborz zone, Iran: change from extensional to compressional regime

Cretaceous magmatic evolution in the Deylaman igneous complex, Alborz zone, Iran: change from extensional to compressional regime

Boninitic geochemical characteristics of high-Mg mafic dykes from the Singhbhum Granitoid Complex, Eastern India

Geochemistry and tectono-magmatic setting of OIT plutonic gabbros in Northern Iran: New evidence for the Oceanic Plume magmatism in the Southern Caspian Sea

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