Timing of eastern North American kimberlite magmatism: continental extension of the Great Meteor hotspot track?

Heaman, Larry M.; Kjarsgaard, Bruce A.

doi:10.1016/s0012-821x(00)00079-0

Cited by 227 publications

(188 citation statements)

References 30 publications

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“…Despite some debate, the origin of kimberlites is mainly attributed to mantle plumes (e.g., ChalapathiRao et al, 2011;Crough et al, 1980;Gibson et al, 1995b;Heaman and Kjarsgaard, 2000;Heaman et al, 2004;Le Roex and Lanyon, 1998), based on the following observations and inferences.…”

Section: Kimberlite-flood Basalt Associationmentioning

confidence: 99%

“…(a) Using high-precision perovskite U-Pb dating results, Heaman and Kjarsgaard (2000) were able to firmly define age progression of Mesozoic-Cenozoic kimberlites in the eastern North America shield along the continental extension of the Great Meteor hotspot track. This represents one of the best examples of kimberlite magmatism following the track of a mantle plume.…”

Section: Kimberlite-flood Basalt Associationmentioning

confidence: 99%

See 1 more Smart Citation

The Early Permian Tarim Large Igneous Province: Main characteristics and a plume incubation model

Wei

Luo

et al. 2014

Lithos

250

160

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Section: Kimberlite-flood Basalt Associationmentioning

confidence: 99%

Section: Kimberlite-flood Basalt Associationmentioning

confidence: 99%

The Early Permian Tarim Large Igneous Province: Main characteristics and a plume incubation model

Wei

Luo

et al. 2014

Lithos

250

160

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“…Two aillikite and five mela-aillikite hand specimens were processed through standard crushing and mineral separation procedures (Wilfley table, methylene iodide, Frantz isodynamic separator) at the University of Alberta following the techniques described in Heaman and Kjarsgaard (2000). Perovskite recovery was best in 20-100 lm range.…”

Section: U-pb Perovskite Geochronologymentioning

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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“…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. For example, the majority of the kimberlite complexes located within the region of Timiskaming, which is located ~1000 km northwest from the MIP, were emplaced between 155 and 134 Ma (i.e., over ~20 Myrs period).…”

Section: Timing Of Magmatism At Okamentioning

confidence: 95%

“…One model proposes that they formed as the result of intraplate melting in an extensional setting associated with opening of the Atlantic Ocean [69,70]. The alternative view is that the MIP results from the passage of the North American plate over the Great Meteor hotspot [59,[71][72][73][74]. The main criticism with the latter is the lack of a precise correlation between the radiometric ages of the MIP-related intrusions and lithospheric plate migration (i.e., geographic position).…”

Section: Relationship Between Oka Monteregian Igneous Province (Mip)mentioning

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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Timing of eastern North American kimberlite magmatism: continental extension of the Great Meteor hotspot track?

Cited by 227 publications

References 30 publications

The Early Permian Tarim Large Igneous Province: Main characteristics and a plume incubation model

The Early Permian Tarim Large Igneous Province: Main characteristics and a plume incubation model

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

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

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