Trace Element and Sr–Pb–Nd–Hf Isotope Evidence for Ancient, Fluid-Dominated Enrichment of the Source of Aldan Shield Lamproites

Davies, Gareth R.; Stolz, A. J.; Mahotkin, I.L.; Nowell, Geoff; Pearson, D.G.

doi:10.1093/petrology/egl005

Cited by 100 publications

(69 citation statements)

References 90 publications

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“…They have relatively low ( 87 Sr/ 86 Sr) i and strongly negative e Nd (t) and e Hf (t) values, similar to those of Triassic nepheline syenites in the Liaodong Peninsula (Fig. 7a) and the worldwide lamproites and Group II kimberlites (Nowell et al, 2004;Davies et al, 2006), suggesting that they could be derived from a common source; for example, subcontinental lithospheric mantle (Nowell et al, 2004;Davies et al, 2006). In addition, the geochemistry of the Triassic nepheline syenites also suggests they were derived by partial melting of an enriched, refractory lithospheric mantle source (mica-or amphibole^pyroxene-bearing harzburgite) beneath the NCC .…”

Section: Groupmentioning

confidence: 57%

“…7c and d). As summarized by Davies et al (2006), two mantle source components have been proposed to explain the origin of negative Áe Hf signatures: sub-cratonic lithospheric mantle and recycled subducted oceanic crust (Salters & White, 1998;Griffin et al, 2000;Janney et al, 2002;Nowell et al, 2004). However, mineral assemblages, and geochemical and isotopic compositions of mantle xenoliths in Paleozoic kimberlites show that the lithospheric mantle beneath both the North China and Yangtze cratons was relatively ancient, refractory mantle (Menzies et al, 1993;Griffin et al, 1998;Xu et al, 2001;Zhang et al, 2001Zhang et al, , 2004.…”

Section: Groupmentioning

confidence: 99%

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Sources and Petrogenesis of Late Triassic Dolerite Dikes in the Liaodong Peninsula: Implications for Post-collisional Lithosphere Thinning of the Eastern North China Craton

Yang

Sun

Chen

et al. 2007

Journal of Petrology

234

102

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A combination of major and trace element, whole-rock Sr, Nd and Hf isotope, and zircon U^Pb isotopic data are reported for a suite of dolerite dikes from the Liaodong Peninsula in the northeastern North China Craton. The study aimed to investigate the source, petrogenesis and tectonic setting of the dikes. Sensitive high-resolution ion microprobe U^Pb zircon analyses yield a LateTriassic emplacement age of $213 Ma for these dikes, post-dating the collision between the North China and Yangtze cratons and consequent ultrahigh-pressure metamorphism. Three geochemical groups of dikes have been identified in the Liaodong Peninsula based on their geochemical and Sr^Nd^Hf isotope characteristics. Group 1 dikes are tholeiitic, with high TiO 2 and total Fe 2 O 3 and low MgO contents, absent to weak negative Nb and Ta anomalies, variable ( 87 Sr/ 86 Sr) i (0Á7060^0Á7153), " Nd (t) (À0Á8 to À6Á5) and " Hf (t) (À2Á7 to À7Á8) values, and negative Á" Hf (t) (À1Á1 to À7Á8).They are inferred to be derived from partial melting of a relatively fertile asthenospheric mantle in the spinel stability field, with some upper crustal assimilation and fractional crystallization. Group 2 dikes have geochemical features of high-Mg andesites with ( 87 Sr/ 86 Sr) i values of 0Á7063^0Á7072, and negative " Nd (t) (À3Á0 to À9Á5) and " Hf (t) (À3Á2 to À10Á1) values, and may have originated as melts of foundered lower crust, with subsequent interaction with mantle peridotite. Group 3 dikes are shoshonitic in composition with relatively low ( 87 Sr/ 86 Sr) i values (0Á7061^0Á7063), and negative " Nd (t) (À13Á2 to À13Á4) and " Hf (t) (À11Á0 to À11Á5) values, and were derived by partial melting of an ancient, re-enriched, refractory lithospheric mantle in the garnet stability field. The geochemical and geochronological data presented here indicate that Late Triassic magmatism occurred in an extensional setting, most probably related to post-orogenic lithospheric delamination.

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Section: Groupmentioning

confidence: 57%

Section: Groupmentioning

confidence: 99%

Sources and Petrogenesis of Late Triassic Dolerite Dikes in the Liaodong Peninsula: Implications for Post-collisional Lithosphere Thinning of the Eastern North China Craton

Yang

Sun

Chen

et al. 2007

Journal of Petrology

234

102

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“…9). The magma source regions of each of these potassic rock suites must have had a common history of relatively low time-integrated Rb/Sr but extreme LREE and HFSE enrichment (low time-integrated Sm/Nd and Lu/Hf), and it is generally believed that isotopic evolution of certain frozen metasomatic melts/fluids isolated within cratonic mantle lithosphere can develop such peculiar isotope signatures (Fraser et al, 1985;O'Brien et al, 1995;Davies et al, 2006;Mirnejad and Bell, 2006). There is an increasing body of evidence to support the view that minor mantle phases such as metasomatic Ti-oxides and pyroxenitic clinopyroxene are much more likely to be the principal source of negative eHf signatures than peridotitic clinopyroxene and garnet Choukroun et al, 2005), which are the major hosts of Hf in the SCLM .…”

mentioning

confidence: 99%

Between carbonatite and lamproite—Diamondiferous Torngat ultramafic lamprophyres formed by carbonate-fluxed melting of cratonic MARID-type metasomes

Tappe

Foley

Kjarsgaard

et al. 2008

Geochimica et Cosmochimica Acta

256

104

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New U-Pb perovskite ages reveal that diamondiferous ultramafic lamprophyre magmas erupted through the Archean crust of northern Labrador and Quebec (eastern Canada) .2). These contrasting isotopic characteristics of aillikites/carbonatites and mela-aillikites, along with subtle differences in their modal carbonate, SiO 2 , Al 2 O 3 , Na 2 O, Cs-Rb, and Zr-Hf contents, are consistent with two distinctive metasomatic assemblages of different age in the mantle magma source region.Integration of petrologic, geochemical, and isotopic information leads us to propose that the isotopically enriched component originated from a reduced phlogopite-richterite-Ti-oxide dominated source assemblage that is reminiscent of MARID suite xenoliths. In contrast, the isotopically depleted component was derived from a more oxidized phlogopite-carbonate dominated source assemblage. We argue that low-degree CO 2 -rich potassic silicate melts from the convective upper mantle were preferentially channelled into an older, pre-existing MARID-type vein network at the base of the North Atlantic craton lithosphere, where they froze to form new phlogopite-carbonate dominated veins. Continued stretching and thinning of the cratonic lithosphere during the Late Neoproterozoic remobilized the carbonate-rich vein material and induced volatile-fluxed fusion of the MARID-type veins and the cold peridotite substrate. Isotopic modelling suggests that only 5-12% trace element contribution from such geochemically extreme MARID-type material is required to produce the observed compositional shift from the isotopically most depleted aillikites/carbonatites towards enriched mela-aillikites.We conclude that cold cratonic mantle lithosphere can host several generations of contrasting vein assemblages, and that each may have formed during past tectonic and magmatic events under distinctively different physicochemical conditions. Although cratonic MARID-type and carbonate-bearing veins in peridotite can be the respective sources for lamproite and carbonatite magmas when present as the sole metasome, their concomitant fusion in a complex source region may give rise to a whole new variety of deep volatile-rich magmas and we suggest that orangeites (formerly Group 2 kimberlites), kamafugites, and certain types of ultramafic lamprophyre are formed in this manner.

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“…Following the experimental results of Foley (1993), Mitchell (1995) and Mitchell and Edgar (2002), which are permissive of derivation of lamproite magma at lithospheric pressures, we prefer to suggest that the Nuapada lamproites are derived from an SCLM source. The fluids or melts responsible for the development of metasomatic assemblages in the source can be derived from the dehydration or partial melting of subducted slabs (Davies et al 2006;Prelevic et al 2007;Akal 2008) or volatiles or melts that emanate from asthenospheric mantle upwellings (Tainton and McKenzie 1994;Choukroun et al 2005;Mitchell 2006) or both (Mirnejad and Bell 2006). The Nuapada lamproites do not exhibit any large-scale subduction-related signatures such as negative Ti and Nb anomalies, suggesting that subducted materials may not have directly played a major role in the metasomatic input to the lamproite source.…”

Section: Petrogenesismentioning

confidence: 99%

Petrology of Lamproites from the Nuapada Lamproite Field, Bastar Craton, India

Sahu

Gupta²,

Patel³

et al. 2013

Proceedings of 10th International Kimberlite Conference

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This work presents the first mineralogical, geochemical and 40 Ar/ 39 Ar geochronological data on hypabyssal facies lamproites near Kalmidadar and Darlimunda in the Nuapada Lamproite Field of the Bastar Craton. The Kalmidadar lamproite is a diamondiferous intrusion with surface dimension of *320 m 9 160 m, whereas the Darlimunda lamproite is a dyke swarm comprising clusters of several narrow (\5 m wide) and elongated bodies. Indicator mineral suite around the Kalmidadar lamproite is marked by abundance of Cr-spinel, rarity of garnet and absence of Cr-diopside and picroilmenite. Mineralogically, the Kalmidadar lamproite comprises phenocrysts of olivine (pseudomorphed by calcite and talc) and microphenocrysts of phlogopite set in a groundmass of chlorite and calcite. The phlogopite is Ti rich (5.4-7.4 wt % TiO 2 ), and the relationship between its Ti content and octahedral site deficiency indicates two substitution mechanisms, viz. Ti + ' $ 2 Mg and Ti ? 2Al $ Mg ? 2Si. The Darlimunda lamproites have undergone pervasive hydrothermal and/or deuteric alteration, which has resulted in complete chloritisation of phlogopite and extensive silicification of the rocks. Tiny grains of rutile and apatite are commonly scattered in the groundmass of both Kalmidadar and Darlimunda lamproites. The Nuapada lamproites have high contents of compatible elements such as V, Cr and Ni and of incompatible elements such as Ba, Zr, Nb and Hf. They also show high abundance of REE and enrichment in LREE relative to HREE. The incompatible element distribution patterns of the lamproites are marked by Nb, Sr, P, Hf and Zr anomalies relative to REE. The observed petrological and geochemical characteristics of the Nuapada lamproites are consistent with the derivation of the magma from a metasomatised subcontinental lithospheric mantle source. Whole-rock 40 Ar/ 39 Ar isotopic data yields an age of 1055 ± 10 Ma for the Nuapada lamproites.

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Trace Element and Sr–Pb–Nd–Hf Isotope Evidence for Ancient, Fluid-Dominated Enrichment of the Source of Aldan Shield Lamproites

Cited by 100 publications

References 90 publications

Sources and Petrogenesis of Late Triassic Dolerite Dikes in the Liaodong Peninsula: Implications for Post-collisional Lithosphere Thinning of the Eastern North China Craton

Sources and Petrogenesis of Late Triassic Dolerite Dikes in the Liaodong Peninsula: Implications for Post-collisional Lithosphere Thinning of the Eastern North China Craton

Between carbonatite and lamproite—Diamondiferous Torngat ultramafic lamprophyres formed by carbonate-fluxed melting of cratonic MARID-type metasomes

Petrology of Lamproites from the Nuapada Lamproite Field, Bastar Craton, India

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