A fresh isotopic look at Greenland kimberlites: Cratonic mantle lithosphere imprint on deep source signal

Tappe, Sebastian; Pearson, D. Graham; Nowell, Geoff; Nielsen, Thorkild; Milstead, Phil; Muehlenbachs, Karlis

doi:10.1016/j.epsl.2011.03.005

Cited by 151 publications

(64 citation statements)

References 75 publications

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“…Therefore, the coherent relation of HREE with Hf anomaly is suggestive of primary kimberlite composition. Moreover recent results from kimberlite trace element modeling also support our conclusion that the Hf anomaly is source inherited (Tappe et al, 2011(Tappe et al, , 2013.…”

Section: Partial Meltingsupporting

confidence: 73%

“…Le and Becker and Le Roex, (2006) in their modeling for South African kimberlites employed partition coefficients for volatile poor basaltic system given by Spath et al (2001) which are at the low end of all measured ranges for these mineral melt pairs. Recently in an alternate approach Tappe et al (2011Tappe et al ( , 2013 utilized new sets of "bulk" peridotite/melt partition coefficients (Brey et al, 2008;Dasgupta et al, 2009) to calculate trace element patterns for partial melts of carbonated peridotite between 6 and 10 GPa. This alternate modeling shows that strong metasomatic enrichment (e.g., Le of the source region is not a requirement as long as the system is CO 2 saturated.…”

Section: Partial Meltingmentioning

confidence: 99%

“…Therefore, evolved kimberlites, which are poor in or devoid of macrocrysts, such as aphanitic varieties can give a true indication of the liquid path. Several studies investigated the trace element geochemistry of kimberlites with a view to constrain the petrogenetic processes involved in their evolution (e.g., Fraser and Hawkesworth, 1992;Tainton and McKenzie, 1994;Beard et al, 1998;Price et al, 2000;Le Roex et al, 2003;Chalapathi Rao et al, 2004;Harris et al, 2004;Becker and Le Roex, 2006;Coe et al, 2008;Tappe et al, 2011Tappe et al, , 2013Toyama et al, 2012).…”

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confidence: 99%

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Petrogenesis of macrocrystic and aphanitic intrusions in Mesoproterozoic diamondiferous pipe 2 kimberlite, Wajrakarur kimberlite field, eastern Dharwar craton, southern India

2014

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Mesoproterozoic Pipe 2 kimberlite intruding granitic gneisses in the Wajrakarur kimberlite field (WKF) of Eastern Dharwar craton, southern India, is one of the first discovered pipes from this field. The two different intrusions belonging to coherent facies are observed in this kimberlite which are texturally distinct i.e., macrocrystic (with abundant macrocrysts) as well as aphanitic (devoid of or very fewer macrocrysts). Petrographic observations give evidence of presence of veined metasomatic mantle in the source region. Distinct geochemical variation is observed between macrocrystic (Mg# 75.4-76.6, SiO 2 : 34.3-35.4 wt%, MgO: 18.7-20.4 wt%) and aphanitic samples (Mg# 74.7-75.5, SiO 2 : 30.4-31.8 wt%, MgO: 21 wt%), furthermore aphanitic samples are relatively more enriched in trace and rare earth elements. Geochemical studies point out that aphanitic and macrocrystic varieties of Pipe 2 kimberlite to be products of the same mantle source but have experienced different evolutionary histories. The inferred primary magma of Pipe 2 kimberlite (for both aphanitic and macrocrystic) is suggested to have a composition of ~33 wt% SiO 2 , Mg# ~ 75.6 and ~460 ppm Ni. Pipe 2 primary magma can be derived by using forward melting model assuming ~1% partial melting of a source enriched in light REE by a factor of ~11 x chondrite and almost chondritic heavy REE with 2% residual garnet. Differences between aphanitic and macrocrystic varieties in their chondrite normalized REE abundance patterns can be explained by about 5% crystal fractionation of primary magma and not by variations in the degree of partial melting. The primitive mantle normalized trace element patterns exhibit significant negative K, Sr, P, Ti and Hf anomalies that are interpreted to be characteristic of the primary magma. Combined petrology and whole rock geochemistry including compatible and incompatible element abundances and their ratios confirm that Pipe 2 kimberlite intrusions are archetypal Group I kimberlites similar to other kimberlites of EDC and not lamproites.

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Section: Partial Meltingsupporting

confidence: 73%

Section: Partial Meltingmentioning

confidence: 99%

mentioning

confidence: 99%

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Petrogenesis of macrocrystic and aphanitic intrusions in Mesoproterozoic diamondiferous pipe 2 kimberlite, Wajrakarur kimberlite field, eastern Dharwar craton, southern India

2014

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“…Thus, we infer the involvement of multiple reservoirs, viz., SCLM and asthenospheric sources, in the genesis of the Garledinne lamproites. Recent studies of potassicultrapotassic rocks have also invoked multiple reservoirs in their genesis (Le Roex et al 2003;Tappe et al 2011). The Th/Nb ratio, normalized to Zr (to eliminate the effects of fractional crystallization) can constitute a sensitive discriminator between orogenic and anorogenic tectonic settings of ultrapotassic rocks, with the former being characterized by a higher Th/Nb (see Kullerud et al 2011).…”

Section: Genesismentioning

confidence: 99%

Petrogenesis of Mesoproterozoic lamproite dykes from the Garledinne (Banganapalle) cluster, south-western Cuddapah Basin, southern India

et al. 2015

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We report mineral chemistry and whole-rock major and trace-element geochemistry for a recent find of Mesoproterozoic (~1.4 Ga) lamproites from the Garledinne (Banganapalle) cluster, south-western part of the PaleoMesoproterozoic Cuddapah Basin, southern India. The Garledinne lamproites occur as WNW-ESE-trending dykes that have undergone varying degree of pervasive silicification and carbonate alteration. Nevertheless, their overall texture and relict mineralogy remain intact and provide important insights into the nature of their magmas. The lamproite dykes have porphyritic to weakly porphyritic textures comprising pseudomorphed olivine macrocrysts and microphenocrysts, titanian phlogopite microphenocrysts, spinel having a compositional range from chromite to rarely magnesiochromite, Srrich apatite and niobian rutile. The Garledinne and other Cuddapah Basin lamproites (Chelima and Zangamarajupalle) collectively lack sanidine, clinopyroxene, potassic richterite, and titanite and are thus mineralogically distinct from the nearby Mesoproterozoic lamproites (Krishna and Ramadugu) in the Eastern Dharwar Craton, southern India. The strong correlation between various major and trace elements coupled with high abundances of incompatible and compatible trace elements imply that alteration and crustal contamination have had a limited effect on the whole-rock geochemistry (apart from K 2 O and CaO) of the Garledinne lamproites and that olivine fractionation played an important role in their evolution. The Garledinne lamproites represent small-degree partial melts derived from a refractory (previously melt extracted) peridotitic mantle source that was subsequently metasomatised (enriched) by carbonate-rich fluids/melts within the garnet stability field. The involvement of multiple reservoirs (sub-continental lithospheric mantle and asthenosphere) has been inferred in their genesis. The emplacement of the Garledinne lamproites is linked to extensional events, across the various Indian cratons, related to the break-up of the Proterozoic supercontinent of Columbia.

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“…Several previous studies of carbonatite and kimberlite alkaline complexes also define a protracted history of magmatic activity up to 40 million years [36,[59][60][61][62][63][64][65][66][67]. Of note, based on U-Pb ages for ~30 kimberlite complexes in North America, Heaman and Kjarsgaard [59] stated that discrete kimberlite emplacement events within individual fields can occur over time intervals of up to 20 Myrs.…”

Section: Timing Of Magmatism At Okamentioning

confidence: 99%

Evidence for the Multi-Stage Petrogenetic History of the Oka Carbonatite Complex (Québec, Canada) as Recorded by Perovskite and Apatite

Chen¹,

Simonetti²

2014

Minerals

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Abstract:The Oka complex is amongst the youngest carbonatite occurrences in North America and is associated with the Monteregian Igneous Province (MIP; Québec, Canada). The complex consists of both carbonatite and undersaturated silicate rocks (e.g., ijolite, alnöite), and their relative emplacement history is uncertain. The aim of this study is to decipher the petrogenetic history of Oka via the compositional, isotopic and geochronological investigation of accessory minerals, perovskite and apatite, using laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS). The new compositional data for individual perovskite and apatite grains from both carbonatite and associated alkaline silicate rocks are highly variable and indicative of open system behavior. In situ Sr and Nd isotopic compositions for these two minerals are also variable and support the involvement of several mantle sources. U-Pb ages for both perovskite and apatite define a bimodal distribution, and range between 113 and 135 Ma, which overlaps the range of ages reported previously for Oka and the entire MIP. The overall distribution of ages indicates that alnöite was intruded first, followed by okaite and carbonatite, whereas ijolite defines a bimodal emplacement history. The combined chemical, isotopic, and geochronological data is best explained by invoking the periodic generation of small volume, partial melts generated from heterogeneous mantle.

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A fresh isotopic look at Greenland kimberlites: Cratonic mantle lithosphere imprint on deep source signal

Cited by 151 publications

References 75 publications

Petrogenesis of macrocrystic and aphanitic intrusions in Mesoproterozoic diamondiferous pipe 2 kimberlite, Wajrakarur kimberlite field, eastern Dharwar craton, southern India

Petrogenesis of macrocrystic and aphanitic intrusions in Mesoproterozoic diamondiferous pipe 2 kimberlite, Wajrakarur kimberlite field, eastern Dharwar craton, southern India

Petrogenesis of Mesoproterozoic lamproite dykes from the Garledinne (Banganapalle) cluster, south-western Cuddapah Basin, southern India

Evidence for the Multi-Stage Petrogenetic History of the Oka Carbonatite Complex (Québec, Canada) as Recorded by Perovskite and Apatite

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