Depletion and refertilization of the Tethyan oceanic upper mantle as revealed by the early Jurassic Refahiye ophiolite, NE Anatolia—Turkey

Uysal, İbrahi̇m; Ersoy, E. Yalçın; Dilek, Yıldırım; Escayola, Mónica Patricia; Sarıfakıoğlu, Ender; Saka, Samet; Hirata, Takafumi

doi:10.1016/j.gr.2013.09.008

Cited by 80 publications

(46 citation statements)

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“…Melt produced in the mantle is likely to crystallize when it migrates through the depleted mantle peridotite, leading to melt refertilization in the peridotites (Jull et al 2002;Dijkstra et al 2003;Seyler et al 2007;Uysal et al 2013). Based on the whole-rock composition of peridotites, Elthon et al (1992) first proposed the concept of melt refertilization.…”

Section: Introductionmentioning

confidence: 99%

Major and trace elements of abyssal peridotites: evidence for melt refertilization beneath the ultraslow-spreading Southwest Indian Ridge (53° E segment)

Chen

Chu

Zhu

et al. 2015

International Geology Review

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This study examines the geochemistry of major and trace elements of abyssal peridotites from the Southwest Indian Ridge (SWIR) (53°E amagmatic segment), to determine the influence of mafic melts on mantle peridotites during melt extraction. The results show a great geochemical variability in the~90 km-long ridge segment, with a degree of mantle melting ranging from 4% to 24%. An ancient melting event may explain the presence of highly depleted peridotites at the ultraslowspreading ridge. The 53°E segment peridotites show enrichment of light rare earth elements (LREEs) (average La N / Sm N = 1.87) and significant positive anomaly of U and Pb normalized to primitive mantle (PM). The positive correlations between LREEs (La, Ce, Pr, Nd) and high field strength elements (HFSEs; e.g. Nb and Zr) suggest that the enrichment of LREEs is caused by melt refertilization, which is also supported by prevalent magmatic microstructures in the peridotites. The melt refertilization model shows that the addition of 0.02-2.7% basaltic melts to peridotites can be responsible for the LREE enrichment. We suggest that the positive anomaly of U is probably attributed to fluid alteration whereas the enrichment of Pb is probably attributed to both melt refertilization and fluid alteration. Melt refertilization in the 53°E segment peridotites may be a result of melt-rock reaction and crystallization of melts trapped in peridotites. These processes may be enhanced by increased melt permeability in the mantle owing to the refractory peridotites produced by ancient melting and the decreasing efficiency of melt extraction in the cold and thick lithosphere at the 53°E ridge segment. The presence of melt refertilization implies that melt extraction is incomplete in the ridge mantle, which may be one of the reasons for the extremely thin and irregular variation of the crustal thickness at ultraslow-spreading ridges.

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Section: Introductionmentioning

confidence: 99%

Major and trace elements of abyssal peridotites: evidence for melt refertilization beneath the ultraslow-spreading Southwest Indian Ridge (53° E segment)

Chen

Chu

Zhu

et al. 2015

International Geology Review

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“…Geochemical compositions of mantle‐derived ultramafic–mafic rock suites provide significant clues to address their genesis, source characters, and mantle evolution as well as variable extents of melting, melt extraction, enrichment‐depletion processes, melt refertilization, metasomatism, etc. Alpine‐type ultramafic–mafic intrusions and ophiolites in orogenic belts preserve geochemical signatures of (a) depleted, MOR‐type mantle that experienced several melt extraction events, (b) melt migration and refertilization, and (c) subduction‐derived metasomatic imprints collectively suggesting evolution of oceanic lithosphere in suprasubduction zone environment and subduction–accretion processes during ocean basin closure (Saha et al, ; Seyler, Lorand, Toplis, & Godard, ; Uysal et al, ). Alaskan‐type ultramafic–mafic intrusions originate from subduction‐processed arc magmas and are emplaced in island arc or active continental margins settings and represent uplifted fragments of concentrically zoned roots of island and continental arcs comprising an ultramafic core and more evolved mafic shells (Abdallah, Ali, & Obeid, ; Dong et al, ; Eyuboglu et al, ; Habtoor, Ahmed, & Harbi, ; Tseng et al, ; L. Yuan, Zhang, Yang, Lu, & Chen, ).…”

Section: Discussionmentioning

confidence: 99%

Evolution of a Mesoarchean suprasubduction zone mantle wedge in the Dharwar Craton, southern India: Evidence from petrology, geochemistry, zircon U–Pb geochronology, and Lu–Hf isotopes

et al. 2019

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Petrological, geochemical, and zircon U–Pb geochronological features of Archean ultramafic–mafic complexes formed in subduction‐related settings provide significant insights into mantle source and geodynamic processes associated with subduction–accretion‐collision events in the early Earth. Here, we investigate a suite of serpentinized dunite, dunite, pyroxenite, and clinopyroxenite from an ultramafic complex along the collisional suture between the Western Dharwar Craton (WDC) and the Central Dharwar Craton (CDC) in southern India. We present petrology, mineral chemistry, zircon U–Pb geochronology, rare earth element (REE), Lu–Hf isotopes, and whole‐rock geochemistry including major, trace element, and platinum‐group element (PGE) data with a view to investigate the magmatic and metasomatic processes in the subduction zone. Mineral chemistry data from chromite associated with the serpentinised ultramafic rocks show distinct characteristics of arc‐related melt. Zircon U–Pb data from the ultramafic suite define different age populations, with the oldest ages at 2.9 Ga, and the dominant age population showing a range of 2.8–2.6 Ga. The early Paleoproterozoic (ca. 2.4 Ga) metamorphic age is considered to mark the timing of collision of the two WDC and CDC. Zircon REE patterns suggest the involvement continental crust components in the magma source. Zircon Lu–Hf analysis yields both positive and negative εHf(t) values from −3.9 to 1.5 with Hf‐depleted model ages (TDM) of 3,041–3,366 Ma for serpentinised dunite and −0.2–2.0 and 2,833–2,995 Ma for pyroxenite, suggesting that the magma was sourced from depleted mantle and was contaminated with the ancient continental crust. Geochemical data show low MgO/SiO2 values and elevated Al2O3/TiO2 ratios, implying subduction‐related setting. The serpentinized dunites and dunites show mild LREE enrichment over HREE, with relatively higher abundance of LILE (Ba, Sr) and depletion in HFSE (Nb, Zr), suggesting fluid–rock interaction, melt impregnation, and refertilization processes. The PGE data suggest olivine, chromite, and sulphide fractionations associated with subduction processes. Our study on the Mesoarchean to Neoarchean ultramafic complex provides important insights to reconstruct the history of the crust–mantle interaction in an Archean suprasubduction zone mantle wedge.

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“…However, the postcollisional Late Cretaceous-early Tertiary volcanic rocks in the Ulukışla basin in the southern part of central Anatolia have higher 87 Sr/ 86 Sr and lower 143 Nd/ 144 Nd ratios than those of the lamprophyres in the Ankara Mélange, indicating an EMII with recycled, continent-derived material. The Late Cretaceous high-K volcanic rocks representing active continental margin arc units in the eastern Pontides with (Alpaslan et al, 2004(Alpaslan et al, , 2006Dilek, 2006, 2013;Dilek and Altunkaynak, 2007;Keskin et al, 2008;Gündogdu-Atakay, 2009;Sarifakioglu et al, 2013).…”

Section: Source Characteristicsmentioning

confidence: 99%

“…Çelik et al (2011) reported the amphibolites in the ophiolitic mélange near Çankırı giving dates between 177.08 ± 0.96 Ma and 166.9 ± 1.1 Ma from amphibole ages. In the eastern part of the investigated area, the isotropic gabbros of Refahiye (Erzincan) ophiolite with MORB-like to island arc tholeiite (IAT) typical geochemical signatures of SSZ oceanic crust give uranium-lead (U-Pb) zircon age of 183 ± 1 Ma (Uysal et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

Jurassic–Paleogene intraoceanic magmatic evolution of the Ankara Mélange, north-central Anatolia, Turkey

2014

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Abstract. Oceanic rocks in the Ankara Mélange along the Izmir-Ankara-Erzincan suture zone (IAESZ) in northcentral Anatolia include locally coherent ophiolite complexes (∼ 179 Ma and ∼ 80 Ma), seamount or oceanic plateau volcanic units with pelagic and reefal limestones (96.6 ± 1.8 Ma), metamorphic rocks with ages of 256.9 ± 8.0 Ma, 187.4 ± 3.7 Ma, 158.4 ± 4.2 Ma, and 83.5 ± 1.2 Ma indicating northern Tethys during the late Paleozoic through Cretaceous, and subalkaline to alkaline volcanic and plutonic rocks of an island arc origin (∼ 67-63 Ma). All but the arc rocks occur in a shale-graywacke and/or serpentinite matrix, and are deformed by southvergent thrust faults and folds that developed in the middle to late Eocene due to continental collisions in the region. Ophiolitic volcanic rocks have mid-ocean ridge (MORB) and island arc tholeiite (IAT) affinities showing moderate to significant large ion lithophile elements (LILE) enrichment and depletion in Nb, Hf, Ti, Y and Yb, which indicate the influence of subduction-derived fluids in their melt evolution. Seamount/oceanic plateau basalts show ocean island basalt (OIB) affinities. The arc-related volcanic rocks, lamprophyric dikes and syenodioritic plutons exhibit high-K shoshonitic to medium-to high-K calc-alkaline compositions with strong enrichment in LILE, rare earth elements (REE) and Pb, and initial ε Nd values between +1.3 and +1.7. Subalkaline arc volcanic units occur in the northern part of the mélange, whereas the younger alkaline volcanic rocks and intrusions (lamprophyre dikes and syenodioritic plutons) in the southern part. The late Permian, Early to Late Jurassic, and Late Cretaceous amphibole-epidote schist, epidote-actinolite, epidote-chlorite and epidote-glaucophane schists represent the metamorphic units formed in a subduction channel in the northern Neotethys. The Middle to Upper Triassic neritic limestones spatially associated with the seamount volcanic rocks indicate that the northern Neotethys was an open ocean with its MORB-type oceanic lithosphere by the early Triassic (or earlier). The latest Cretaceous-early Paleocene island arc volcanic, dike and plutonic rocks with subalkaline to alkaline geochemical affinities represent intraoceanic magmatism that developed on and across the subduction-accretion complex above a N-dipping, southward-rolling subducted lithospheric slab within the northern Neotethys. The Ankara Mélange thus exhibits the record of ∼ 120-130 million years of oceanic magmatism in geological history of the northern Neotethys.

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Depletion and refertilization of the Tethyan oceanic upper mantle as revealed by the early Jurassic Refahiye ophiolite, NE Anatolia—Turkey

Cited by 80 publications

References 100 publications

Major and trace elements of abyssal peridotites: evidence for melt refertilization beneath the ultraslow-spreading Southwest Indian Ridge (53° E segment)

Major and trace elements of abyssal peridotites: evidence for melt refertilization beneath the ultraslow-spreading Southwest Indian Ridge (53° E segment)

Evolution of a Mesoarchean suprasubduction zone mantle wedge in the Dharwar Craton, southern India: Evidence from petrology, geochemistry, zircon U–Pb geochronology, and Lu–Hf isotopes

Jurassic–Paleogene intraoceanic magmatic evolution of the Ankara Mélange, north-central Anatolia, Turkey

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