Plates or plumes in the origin of kimberlites: U/Pb perovskite and Sr-Nd-Hf-Os-C-O isotope constraints from the Superior craton (Canada)

Tappe, Sebastian; Brand, Natalie Bronwyn; Stracke, Andreas; Acken, David van; Liu, Chuan-Zhou; Strauß, Harald; Wu, Fu‐Yuan; Luguet, Ambre; Mitchell, Roger H.

doi:10.1016/j.chemgeo.2016.08.019

Cited by 74 publications

(47 citation statements)

References 190 publications

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“…Our PGE contents are also lower, by about 50%, than the results of Rao et al (2014) for orangeites from the Bastar craton of India which showed average PGE contents of 3.5 ppb Ru, and ~3 ppb Pt and Pd each ( Fig. 4g) However, our PGE levels are broadly similar to those of Tappe et al (2016) who analysed Os, Ir, Ru, Pt, Pd and Re in two Canadian kimberlite clusters (Renard and Wemindji), using ID-N-TIMS for Os and ID-ICP-MS for the other PGE ( Fig. 4h).…”

Section: Resultssupporting

confidence: 53%

“…(ii) Mgilmenite, (iii) pyrope garnet derived from a range of sources including high Cr, Ca-depleted harzburgite to Ca-saturated lherzolite and Ca-rich wehrlite, to Ti-rich megacryst-compositions, and orange garnets derived from mantle eclogite, (iv) clinopyroxene comprising lherzolitic, low-Cr megacrystic, and eclogitic subgroups (O'Brien, 2015), and (v) spinels from upper mantle spinel lherzolites and rare chromites plotting within the diamond inclusion field (O'Brien, 2015). The rocks have relatively depleted isotopic signatures (Kargin et al, 2014) plotting close to South African Group I kimberlites as well as kimberlites in Canada (Tappe et al, 2016) in εNd vs Sr i , albeit at slightly lower εNd (around 0) (Fig. 3, O'Brien and Tyni, 1999).…”

Section: Samplesmentioning

confidence: 95%

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Platinum-group element contents of Karelian kimberlites: Implications for the PGE budget of the sub-continental lithospheric mantle

Maier

O’Brien

Peltonen

et al. 2017

Geochimica et Cosmochimica Acta

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We present high-precision isotope dilution data for Os, Ir, Ru, Pt, Pd and Re in Group I and Group II kimberlites from the Karelian craton, as well as 2 samples of the Premier Group I kimberlite pipe from the Kaapvaal craton. The samples have, on average, 1.38 ppb Pt and 1.33 ppb Pd, with Pt/Pd around unity. These PGE levels are markedly lower, by as much as 80%, than those reported previously for kimberlites from South Africa, Brazil and India, but overlap with PGE results reported recently from Canadian kimberlites. Primitive-mantle-normalised chalcophile element patterns are relatively flat from Os to Pt, but Cu, Ni and, somewhat less so, Au are enriched relative to the PGE (e.g., Cu/Pd >25.000). Pd/Ir ratios are 3,6 on average, lower than most other mantle melts. The PGE systematics can be largely explained by two components, (i) harzburgite / lherzolite detritus of the SCLM with relatively high IPGE (Os-Ir-Ru) / PPGE (Rh-Pt-Pd) ratios, and (ii) a melt component that has high PPGE/IPGE ratios. By using the concentrations of iridium in the *Manuscript kimberlites as a proxy for the proportion of mantle detritus in the magma, we estimate that the analysed kimberlites contain 3-27% entrained and partially dissolved detritus from the subcontinental lithospheric mantle, consistent with previous estimates of kimberlites elsewhere (Tappe

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Section: Resultssupporting

confidence: 53%

Section: Samplesmentioning

confidence: 95%

Platinum-group element contents of Karelian kimberlites: Implications for the PGE budget of the sub-continental lithospheric mantle

Maier

O’Brien

Peltonen

et al. 2017

Geochimica et Cosmochimica Acta

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“…Thus, elevated Zr/Hf values can be achieved by clinopyroxene 2018; Tappe et al, 2004;Tappe et al, 2008;Tappe et al, 2016;Tappe et al, 2017;Vichi, Stoppa, & Wall, 2005;Woodard et al, 2014;Zeng, Chen, Xu, Jiang, & Hofmann, 2010). Low Zr and Hf content with respect to Sm in the studied lamprophyres coupled with higher Nb/Yb ratios points to a role of an enriched OIB type mantle source region affected by carbonate metasomatism (Figures 8 and 9 (Dasgupta & Hirschmann, 2006;Foley et al, 2009;Hirose, 1997;Kiseeva et al, 2012 The biotite composition is similar to those found in global calc-alkaline lamprophyres (Rock, 1987) i.e., having high aluminium and low titanium.…”

Section: Source Mineralogy and Petrogenesissupporting

confidence: 59%

“…Carbonate metasomatism of the mantle source for the calc‐alkaline and shoshonitic as well as ultramafic lamprophyres, anorogenic lamproites, and ocean island basalts and both continental and oceanic alkali basalts have been proposed by various workers based on elevated Zr/Hf, enrichment of LILEs with respect to the HFSEs (lower Zr/Sm and Hf/Sm ratios) and lower Ti/Eu (e.g., Beier et al, ; Chakrabarti, Basu, Santo, Tedesco, & Vaselli, ; Conticelli et al, ; Dai, Zhao, & Zheng, ; Dai, Zhao, Zheng, An, & Zheng, ; Dai, Zheng, Zhao, & Zheng, ; Guo, Fan, Wang, & Zhang, ; Prevelic, Foley, Romer, & Conticelli, ; Talukdar et al, ; Tappe et al, ; Tappe et al, ; Tappe et al, ; Tappe et al, ; Vichi, Stoppa, & Wall, ; Woodard et al, ; Zeng, Chen, Xu, Jiang, & Hofmann, ). Low Zr and Hf content with respect to Sm in the studied lamprophyres coupled with higher Nb/Yb ratios points to a role of an enriched OIB type mantle source region affected by carbonate metasomatism (Figures and ).…”

Section: Discussionmentioning

confidence: 99%

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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“…Their low-temperature cooling histories and crustal xenoliths can also be used to constrain cratonic erosion and evaluate the links between surface and deeper processes [Stanley et al, 2013[Stanley et al, , 2015. Numerous mechanisms have been proposed for kimberlite genesis, including mantle plume activity and hotspot tracks [e.g., Le Roex, 1986;Skinner, 1989;Heaman and Kjarsgaard, 2000;Chalapathi Rao et al, 2015], tectonically triggered thermal events involving continental break up and lithospheric-scale faults [e.g., Jelsma et al, 2004Jelsma et al, , 2009Moore et al, 2008;Tappe et al, 2014Tappe et al, , 2016, deep-seated subduction [e.g., Helmstaedt and Gurney, 1984;McCandless, 1999;Currie and Beaumont, 2011;Duke et al, 2014], and/or some combination of these [e.g., Heaman et al, 2004]. Others have argued that kimberlite volcanism is triggered from the edges of large, low seismic velocity structures in the deep mantle [Torsvik et al, 2010] and used the ages and locations of kimberlite eruptions to support the longevity of these mantle structures and calibrate plate motion reconstructions [Torsvik et al, 2014].…”

Section: Introductionmentioning

confidence: 99%

Dating kimberlite emplacement with zircon and perovskite (U‐Th)/He geochronology

Stanley

Flowers

2016

Geochem Geophys Geosyst

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Kimberlites provide rich information about the composition and evolution of cratonic lithosphere. Accurate geochronology of these eruptions is key for discerning spatiotemporal trends in lithospheric evolution, but kimberlites can sometimes be difficult to date with available methods. We explored whether (U-Th)/He dating of zircon and perovskite can serve as reliable techniques for determining kimberlite emplacement ages. We obtained zircon and/or perovskite (U-Th)/He (ZHe, PHe) dates from 16 southern African kimberlites. Most samples with abundant zircon yielded reproducible ZHe dates ( 15% dispersion) that are in good agreement with published eruption ages. The majority of dated zircons were xenocrystic. Zircons with reproducible dates were fully reset during eruption or resided at temperatures above the ZHe closure temperature prior to entrainment in the kimberlite magma. Not dating hazy and radiation damaged grains can help avoid anomalous results for more shallowly sourced zircons that underwent incomplete damage annealing and/or partial He loss during the eruptive process. All seven kimberlites dated with PHe yielded reproducible ( 15% dispersion) and reasonable results. We conducted two preliminary perovskite 4 He diffusion experiments, which suggest a PHe closure temperature of >3008C. Perovskite in kimberlites is unlikely to be xenocrystic and its relatively high temperature sensitivity suggests that PHe dates will typically record emplacement rather than postemplacement processes. ZHe and PHe geochronology can effectively date kimberlite emplacement and provide useful complements to existing techniques.

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Plates or plumes in the origin of kimberlites: U/Pb perovskite and Sr-Nd-Hf-Os-C-O isotope constraints from the Superior craton (Canada)

Cited by 74 publications

References 190 publications

Platinum-group element contents of Karelian kimberlites: Implications for the PGE budget of the sub-continental lithospheric mantle

Platinum-group element contents of Karelian kimberlites: Implications for the PGE budget of the sub-continental lithospheric mantle

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

Dating kimberlite emplacement with zircon and perovskite (U‐Th)/He geochronology

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