Mantle Metasomatism at the Edge of a Retreating Subduction Zone: Late Neogene Lamprophyres from the Island of Kos, Greece

Soder, Christian; Altherr, Rainer; Romer, Rolf L.

doi:10.1093/petrology/egw054

Cited by 35 publications

(24 citation statements)

References 133 publications

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“…εNd (t) vs. 87 Sr/ 86 Sr (t) isotope variation diagram. Compositional fields of Island of Kos, Spanish Central System, Hermosillo lamprophyres (Mexico) are from Soder et al (), Orejana, Villaseca, Billström, and Paterson (), and Garza, Dostal, Keppie, and Paz‐Moreno (), respectively [Colour figure can be viewed at wileyonlinelibrary.com]…”

Section: Resultsmentioning

confidence: 99%

“…(a) Zr/Hf vs. Nb/Ta variation diagram showing sub‐ and super‐chondritic Nb/Ta and Zr/Hf ratios for the studied samples, respectively. Data sources: Island of Kos lamprophyres (Soder et al, ), South African Group I kimberlites (Becker & Le Roex, ), ocean island basalts (OIB), continental basalts and continental crust (Münker, Pfander, Weyer, Büchl, & Mezger, ), Tethyan realm lamproites (Prevelic et al, ), global anorogenic lamproites (compilation from Lustrino et al, ), and Nyiragongo lava (Chakrabarti et al, ). Note that the group‐I kimberlites, anorogenic lamproites, and Nyiragongo lava have Zr/Hf compositions much higher than the maximum limit shown here.…”

Section: Discussionmentioning

confidence: 99%

“…The mixed orogenic and anorogenic geochemical affinity of the EDC shoshonitic lamprophyres from the Wajrakarur kimberlite field can be explained by the interaction between their lithospheric sources and the carbonatite melts derived from the asthenosphere. Possible mechanisms through which lithosphere and metasomatic carbonatitic melts from asthenosphere can intermingle include (a) thermal erosion or delamination of lithospheric mantle and upwelling of asthenospheric mantle from below to shallow levels (e.g., Duggen et al, ; Foley, ; Prevelic et al, ; Sheldrick et al, ; Xu, Ma, Frey, Feigenson, & Liu, ); (b) slab window in an active subduction zone in which the thick and dense foundering lithosphere break off allowing the asthenosphere to invade the subduction modified mantle wedge (e.g., Ferrari, ; Prevelic, Akal, Romer, Mertz‐Kraus, & Helvaci, ; Soder, Altherr, & Romer, ; Thorkelson, ; Wortel & Spakman, ); and (c) infiltration of low‐degree partial melts from upper portion of sub‐lithospheric mantle or thermal boundary layer to the lower reaches of lithospheric mantle or mechanical boundary layer leading to asthenospherization of SCLM (e.g., McKenzie, ; Pandey, Chalapathi Rao, Chakrabarti, et al, ; Seghedi et al, ; Tang, Zhang, & Ying, ; Tappe et al, ). Besides these models, a mixed OIB and arc‐type geochemical affinity can also be observed when either a plume and arc interact (e.g., Gazel et al, ; Gazel et al, ) or OIB seamount subducts (e.g., Ulrich, Hѐmond, Nonnotte, & Jochum, ; Timm et al, ).…”

Section: Discussionmentioning

confidence: 99%

“…Average OIB and normalizing values are from Sun and McDonough (1989), data for average alkali basalt data is from West Qinling, China (Dai et al, 2018) and Nyiragongo lava, East Africa Rift (Chakrabarti et al, 2009). Average calciocarbonatite data is from Woolley and Kempe (1989) (Soder et al, 2016), South African Group I kimberlites (Becker & Le Roex, 2006), ocean island basalts (OIB), continental basalts and continental crust (Münker, Pfander, Weyer, Büchl, & Mezger, 2003), Tethyan realm lamproites (Prevelic et al, 2008), global anorogenic lamproites (compilation from Lustrino et al, 2016), and Nyiragongo lava (Chakrabarti et al, 2009). Note that the group-I kimberlites, anorogenic lamproites, and Nyiragongo lava have Zr/Hf compositions much higher than the maximum limit shown here.…”

Section: Source Mineralogy and Petrogenesismentioning

confidence: 99%

See 3 more Smart Citations

Lithosphere–asthenosphere interaction and carbonatite metasomatism in the genesis of Mesoproterozoic shoshonitic lamprophyres at Korakkodu, Wajrakarur kimberlite field, Eastern Dharwar Craton, southern India

et al. 2019

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The spatial and temporal association between lamprophyres and kimberlites provides unique opportunities to explore their genetic relationships. This paper explores such a relationship by detailing mineralogical and geochemical aspects of Korakkodu lamprophyre dykes located within the well‐known Mesoproterozoic diamondiferous Wajrakarur Kimberlite field (WKF), towards the south‐western margin of Paleo–Mesoproterozoic Cuddapah Basin, Eastern Dharwar Craton, southern India. Mineralogy reveals that these dykes belong to calc‐alkaline variety of lamprophyres, but their geochemistry display mixed signals of both alkaline and calc‐alkaline lamprophyres. These lamprophyres are highly potassic, and their high Al2O3 and low‐TiO2 content implies a shoshonitic character. Low Mg#, Ni, and Cr concentration highlight their evolved nature. High (La/Yb)N and (Gd/Yb)N content is consistent with their derivation from low degrees of partial melting, whereas highly fractionated nature suggests the presence of garnet in their source. Absence of prominent Nb‐Ta anomaly implies to the dilution of lithospheric mantle source by melts rich in HFSEs and low La/Nb ratio compared to those of the calc‐alkaline island arc volcanics and suggests an asthenospheric overprint on lithospheric mantle source. Carbonatite metasomatism in the source region of these lamprophyres is apparent from conspicuously high‐Zr/Hf ratio, and the HFSE budget of these lamprophyres are principally controlled by the presence of phlogopite veins in their lithospheric source. An extremely heterogeneous and layered lithospheric mantle beneath Eastern Dharwar Craton has been inferred from the divergent genetic history of Mesoproterozoic lamprophyres and kimberlites in the Wajrakarur field.

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Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Source Mineralogy and Petrogenesismentioning

confidence: 99%

See 2 more Smart Citations

Lithosphere–asthenosphere interaction and carbonatite metasomatism in the genesis of Mesoproterozoic shoshonitic lamprophyres at Korakkodu, Wajrakarur kimberlite field, Eastern Dharwar Craton, southern India

et al. 2019

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“…The melts‐fluids may be related to paleo‐subduction events (e.g., Dai et al, , ; Rooney et al, ; Tappe et al, ; Zheng, ) or low‐degree asthenospheric melting during incipient thermal perturbation of the mantle (e.g., Pilet, ). Amphibole that forms by the two mechanisms generally has the same major element composition (e.g., Mayer et al, ; Pilet, ; Pilet et al, , ), but amphibole that precipitates in veins cutting peridotites has lower Mg # values than amphibole disseminated in peridotite as intergranular minerals (Figure a; Soder et al, , and references therein). Low‐Mg # amphibole preferentially incorporates Nb over Zr and Zr over Hf, leading to lower Zr/Nb and higher Zr/Hf ratios in vein assemblages (Tiepolo et al, ).…”

Section: Petrogenesis Of the Yawa Intrusionsmentioning

confidence: 99%

Initial Rifting of the Lhasa Terrane from Gondwana: Insights From the Permian (~262 Ma) Amphibole‐Rich Lithospheric Mantle‐Derived Yawa Basanitic Intrusions in Southern Tibet

Zeng

Ducea

et al. 2019

JGR Solid Earth

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The Permian tectonic setting of the Lhasa Terrane in southern Tibet remains controversial (i.e., continental rift vs. subduction‐collision) and is crucial to palinspastic reconstructions of the eastern Tethys during the breakup of Gondwana. In this study, we present new geochronological, geochemical, and mineralogical data for the Permian (~262 Ma) Yawa intrusions in the southern Lhasa Terrane. These rocks are silica‐undersaturated and alkaline, with high TiO2 and moderate MgO, and exhibit enrichments in Th, light rare earth elements, and Nb‐Ta, and depletions in K. These chemical compositions, combined with uniform whole‐rock (87Sr/86Sr)i (0.7039–0.7044), εNd(t) (1.85–2.81), and εHf(t) (4.21–6.90) values, and zircon εHf(t) (4.53–9.97) and δ18O (5.04‰–5.76‰) values, indicate the magmas were derived by partial melting of amphibole‐rich lithospheric mantle. The magmas subsequently underwent fractionation of clinopyroxene, amphibole, and Fe‐Ti oxides. The amphibole in the lithospheric mantle likely formed as cumulates from low‐degree asthenospheric melts during incipient extension. Given that the amphibole‐rich metasomatic veins have a lower melting temperature than the surrounding peridotite, they were susceptible to melting during the early stages of thermal perturbation of the mantle. Because there is no evidence of Permian continental subsidence in the Lhasa Terrane, we suggest the Yawa intrusions were formed at the onset of lithospheric extension associated with initial rifting of the Lhasa Terrane from the Indian Plate during Gondwana breakup, which was a precursor to the opening of the Neo‐Tethys Ocean.

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Petrogenesis of the Late Mesozoic gabbros in the eastern Jiangnan Orogen, South China: Characteristics of the lithospheric mantle

Wang

Yan

et al. 2020

Geological Journal

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As we know, mantle‐derived mafic rocks can be used to effectively trace the nature of the mantle source and constrain the regional tectonic setting and evolution. Recently, a Late Mesozoic mafic intrusive body (Huangmao pluton) has been found in the eastern Jiangnan Orogen (EJO). In this study, we investigate this pluton using petrography, whole‐rock geochemistry, Sr–Nd–Pb isotopes, and geochronology. The Huangmao pluton is primarily composed of a fine‐grained gabbro‐diabase, which is characterized by consistent SiO2, MgO, Fe2O3T, and TiO2 contents. These gabbros exhibit continental crust‐like trace element signatures, i.e., enriched in large‐ion lithophile elements (LILE), Pb, and light rare earth elements (LREE), but depleted in high‐field‐strength elements (HFSE). In addition, the Huangmao gabbros have moderate initial 87Sr/86Sr ratio (0.7065–0.7080) and slightly negative to weakly positive εNd(t) value (−2.06 to +0.84). Finally, U–Pb zircon dating confirms that the Huangmao pluton was emplaced in the Late Jurassic (152.6 ± 3.1 Ma). Through an integrated geochemical analysis, these Late Mesozoic gabbros were genetically originated from an enriched lithospheric mantle source, which formed by a metasomatic reaction between mantle peridotite and sediment‐derived felsic melt. Consequently, the lithologies of the metasomatite were predominantly pyroxenites with a small amount of pyroxene‐rich peridotites. Considering the large distance between the modern trench and the EJO, the flat‐slab subduction and rollback model of the palaeo‐Pacific Plate is the most reasonable interpretation of the geodynamic setting that resulted in Late Mesozoic magmatism in the EJO.

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Mantle Metasomatism at the Edge of a Retreating Subduction Zone: Late Neogene Lamprophyres from the Island of Kos, Greece

Cited by 35 publications

References 133 publications

Lithosphere–asthenosphere interaction and carbonatite metasomatism in the genesis of Mesoproterozoic shoshonitic lamprophyres at Korakkodu, Wajrakarur kimberlite field, Eastern Dharwar Craton, southern India

Lithosphere–asthenosphere interaction and carbonatite metasomatism in the genesis of Mesoproterozoic shoshonitic lamprophyres at Korakkodu, Wajrakarur kimberlite field, Eastern Dharwar Craton, southern India

Initial Rifting of the Lhasa Terrane from Gondwana: Insights From the Permian (~262 Ma) Amphibole‐Rich Lithospheric Mantle‐Derived Yawa Basanitic Intrusions in Southern Tibet

Petrogenesis of the Late Mesozoic gabbros in the eastern Jiangnan Orogen, South China: Characteristics of the lithospheric mantle

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