Mid-ocean ridge and supra-subduction geochemical signatures in spinel–peridotites from the Neotethyan ophiolites in SW Turkey: Implications for upper mantle melting processes

Aldanmaz, Ercan; Schmidt, Michael W. I.; Gourgaud, Alain; Meisel, Thomas

doi:10.1016/j.lithos.2009.03.010

Cited by 113 publications

(89 citation statements)

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“…This relationship supports the notion that the boninitic melts, together with subduction-related magmas and fluids, interacted with the upper mantle rocks in a mantle wedge during their ascent. However, the harzburgites are also represented by a wide range of oxygen fugacities (from −0.203 to +0.578) and by lower and almost constant Cr#s of spinel compositions, which we attribute to fluid-rock interactions (Aldanmaz et al, 2009). …”

Section: F O 2 and Melt Evolutionmentioning

confidence: 84%

Multiple episodes of melting, depletion, and enrichment of the Tethyan mantle: Petrogenesis of the peridotites and chromitites in the Jurassic Skenderbeu massif, Mirdita ophiolite, Albania

Yang

Dilek

et al. 2017

Lithosphere

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The Jurassic Mirdita ophiolite in Albania displays a structural-geochemical transition from a mid-ocean ridge-type (MOR) oceanic lithosphere in the west to a suprasubduction zone (SSZ) type in the east across an ~30-km-wide fossil Tethyan oceanic domain. We investigated the upper mantle peridotites of the Skenderbeu massif, situated at this transition within the ophiolite, to document the geochemical fingerprint of the inferred tectonic switch. The peridotites comprise harzburgites and dunites with podiform chromitite deposits. We present new whole-rock major element, trace element, rare earth element (REE), and platinum group element chemistry to evaluate their mantle melt evolution and petrogenesis. Harzburgites have high average CaO, Al 2 O 3 , and REE contents, and contain Al-rich pyroxene and spinel with lower Cr contents. Dunites have low average CaO, Al 2 O 3 , and REE values, and contain Al-poor clinopyroxene and high-Cr spinel. Modeling of trace element compositions of the harzburgites suggests as much as ~10%-15% melting, whereas the trace element compositions of the dunites indicate ~20%-25% melting. The harzburgites and dunites and chromitites represent, respectively, the products of low-degree partial melting in a MOR setting, and the products of high-degree partial melting and refertilization in a forearc mantle. The harzburgites resulted from rock-melt interactions between ascending melts and residual peridotites beneath a MOR, whereas the dunites and the high-Cr chromitites formed as a result of interactions between boninitic melts and mantle peridotites in a mantle wedge. The Skenderbeu mantle units thus constitute a geochemical-petrological archive of a transition from MOR to SSZ melt evolution in space and time within the same ocean basin.

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Section: F O 2 and Melt Evolutionmentioning

confidence: 84%

Multiple episodes of melting, depletion, and enrichment of the Tethyan mantle: Petrogenesis of the peridotites and chromitites in the Jurassic Skenderbeu massif, Mirdita ophiolite, Albania

Yang

Dilek

et al. 2017

Lithosphere

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“…Both mid-ocean ridge (MOR) and suprasubduction zone (SSZ) models have been proposed for the genesis of the Oman ophiolite (Rioux et al, 2013). MOR-and SSZ-type mantle residues have been reported from mantle tectonites of the Tauride ophiolites, suggesting a low-degree of partial melting in a mid-ocean ridge environment during the opening stage of the Neotethyan oceanic basins followed by re-melting and depletion in a suprasubduction zone (SSZ) setting (Saka et al, 2014;Uysal et al, 2012;Caran et al, 2010;Aldanmaz et al, 2009). All the evidence suggests that MOR-type oceanic lithosphere generation was overprinted by SSZtype oceanic lithosphere, that emplaced onto continental margins, after subduction initiation in response to convergence.…”

Section: Discussionmentioning

confidence: 99%

“…The mantle peridotites in the Köyceğiz (Muğla) area are composed of Cpx-bearing harzburgite, depleted harzburgite and dunite (Uysal et al, 2012;Aldanmaz et al, 2009). Uysal et al (2012) reported that the Cpxharzburgites contain high CaO (2.27 wt.%) and Al 2 O 3 (2.07 wt.%) together with low Cr contents in coexisting spinels (Cr#=100×Cr/(Cr/Al): 13-22).…”

Section: Petrogenesis and Geochronology Of The Lycian Ophiolitesmentioning

confidence: 99%

The tauride ophiolites of Anatolia (Turkey): A review

Parlak¹

2016

J. Earth Sci.

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The Tauride ophiolites lie on the northern and southern flanks of an E-W-trending Tauride carbonate platform. They mainly consist of three tectonic units namely in ascending order, ophiolitic mélange, sub-ophiolitic metamorphic sole and oceanic lithospheric remnants. They were generated above intra-oceanic subduction zones and emplaced over the Tauride carbonate platform from different Neotethyan oceanic basins in the Late Cretaceous. Tauride ophiolites from west to east are described and reviewed. All are underlain by well-preserved dynamothermal metamorphic soles of varied structural thicknesses up to 500 m that have a constant structural position between ophiolitic mélange below and harzburgitic mantle tectonites above and display typical inverted metamorphic sequences from amphibolite facies above to greenschist facies below. The metamorphic soles are shown to have evolved during the initiation of subduction and emplacement processes. In the Pozantı-Karsantı area the contact between the metamorphic sole and the overlying serpentinized harzburgites is characterized by a 1.5-2-m-thick zone of sheared serpentinized harzburgitic mantle intercalated with amphibolites and cut by thick mafic dykes (7-8 m) which postdate intraoceanic metamorphism and high-temperature ductile deformation. This contact is interpreted as an intra-oceanic decoupling surface along which volcanics from the upper levels of the down-going plate were metamorphosed to amphibolite facies and accreted to the base of the hanging wall plate. The metamorphic soles and overlying ophiolitic rocks were intruded by numerous isolated post-metamorphic diabase dykes filled by island arc tholeiitic magma. Subduction initiation and roll-back processes best explain the structural and petrological relationships of Late Cretaceous ophiolite genesis, metamorphic sole formation and subsequent dyke emplacement of the Tauride ophiolites. KEY WORDS: ophiolite, metamorphic sole, dyke emplacement, roll-back, subduction initiation. INTRODUCTIONThe Tauride orogenic belts of Turkey are interpreted as representing a continental fragment that rifted from Gondwana (North Africa) during the Triassic, followed by reamalgamation and continental collision during the OligoMiocene (Karaoğlan et al., 2016) or Miocene (Okay et al., 2010). The Taurides are traditionally divided into three contiguous parts; the western, central and eastern Taurides (Özgül, 1976).Ophiolites along the Tauride belt start with the Lycian nappes to the west and end with the Divriği ophiolite to the east (Fig. 1). These ophiolites (the Lycian nappes, Antalya, Beyşehir-Hoyran nappes, Mersin, Alihoca, Pozantı-Karsantı, Pınarbaşı and Divriği) are situated either on the northern or on the southern flank of an approximately E-W trending Tauride carbonate platform axis (Juteau, 1980 (Juteau, 1980). The plutonic sections and the metamorphic soles of the Tauride ophiolites are cut by numerous isolated microgabbro-diabase and minor pyroxenite dykes at different structural levels (Robertson et al

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“…They are the remnants of much higher degrees of partial melting of the upper mantle above a subducting slab (e.g. Aldanmaz et al 2009). Olivine in these harzburgites is characterized by higher forsterite content.…”

Section: Mineral Chemistry Of the Ophiolitic Peridotites And Gabbros mentioning

confidence: 99%

Mineral chemistry of the ophiolitic peridotites and gabbros from the Serow area: Implications for tectonic setting and locating the Neotethys suture in NW Iran

Rezaii¹,

Moazzen²

2014

Central European Geology

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The Serow ophiolite in NW Iran, located at the Iran-Turkey border, is composed of mantle sequence peridotites, predominantly lherzolitic-harzburgite with subordinate amounts of lherzolite and dunite, and a crustal sequence made from gabbros, diabases, pillow lavas and deep marine carbonates and radiolarite sediments. The rocks appear as a tectonic mélange. This ophiolitic complex forms part of the ophiolites marking a branch of Neotethys oceanic crust in NW Iran. The chemistry of olivine, orthopyroxene and clinopyroxene in the lherzolitic-harzburgite and clinopyroxene in the gabbros suggests a supra-subduction setting for the ophiolite. The Serow ophiolite is similar to other ophiolites in NW Iran such as the Piranshahr, Naghadeh and Khoy and NE Turkey ophiolites in terms of the rock units, tectonic setting and age. The Serow ophiolite links the Iranian ophiolites from Baft in the SE through the South Azerbaijan suture to the Izmir-Ankara-Erzincan suture in the NW.

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Mid-ocean ridge and supra-subduction geochemical signatures in spinel–peridotites from the Neotethyan ophiolites in SW Turkey: Implications for upper mantle melting processes

Cited by 113 publications

References 50 publications

Multiple episodes of melting, depletion, and enrichment of the Tethyan mantle: Petrogenesis of the peridotites and chromitites in the Jurassic Skenderbeu massif, Mirdita ophiolite, Albania

Multiple episodes of melting, depletion, and enrichment of the Tethyan mantle: Petrogenesis of the peridotites and chromitites in the Jurassic Skenderbeu massif, Mirdita ophiolite, Albania

The tauride ophiolites of Anatolia (Turkey): A review

Mineral chemistry of the ophiolitic peridotites and gabbros from the Serow area: Implications for tectonic setting and locating the Neotethys suture in NW Iran

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