The role of lithospheric heterogeneity on the composition of kimberlite magmas from a single field: The case of Kaavi-Kuopio, Finland

Dalton, Hayden; Giuliani, Andrea; O’Brien, Hugh; Phillips, David; Hergt, Janet

doi:10.1016/j.lithos.2019.105333

Cited by 35 publications

(26 citation statements)

References 74 publications

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“…Mineral composition data from Dalton, Giuliani, O'Brien, et al. (2020), age data from Dalton, Giuliani, Phillips, et al. (2020).…”

Section: Discussionmentioning

confidence: 99%

“…An additional complexity to consider is the role of a heterogeneous mantle lithosphere, particularly variations in lithospheric thickness, because kimberlites are well known to extensively interact with and assimilate lithospheric mantle material (e.g., Giuliani et al., 2020b; Russell et al., 2012; Soltys et al., 2016; Tovey et al., 2021; Xu et al., 2021). The latter has been shown to have a pivotal role in the major element make‐up of primitive melts parental to the Kaavi‐Kuopio kimberlites (Dalton, Giuliani, O'Brien, et al., 2020).…”

Section: Discussionmentioning

confidence: 99%

“…Additional evidence against the role of assimilation in displacing Hf compositions may lie in the robust relationship ( R 2 = 0.67, p = 0.02; Figure 7 ) between oxygen fugacity ( fO 2 ) values presented by Dalton, Giuliani, O'Brien, et al ( 2020 ) and our new εHf ( i ) data, whereby more enriched Hf isotope signatures ( i.e., negative εHf ( i ) ) are linked to more reduced fO 2 values ( i.e., negative ΔNNO ). We note that Pipe 14 has a poorly constrained fO 2 ( −2.3 ± 3.3 ); removing this data point only strengthens the observed relationship ( R 2 = 0.82, p = 0.01 ).…”

Section: The Role Of Lithospheric Assimilationmentioning

confidence: 96%

“…Relationship between average εHf ( i ) and average whole-rock compositions with regression models fitted for the Kaavi-Kuopio kimberlites. ( a ) Average Hf/Nb versus average εHf ( i ) ; ( b ) Average Zr/Nb versus average εHf ( i ).Whole-rock composition data fromDalton, Giuliani, O'Brien, et al ( 2020 ). R 2 is the correlation coefficient, shaded field represents a 1 standard deviation uncertainty envelope.…”

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confidence: 99%

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Geodynamic and Isotopic Constraints on the Genesis of Kimberlites, Lamproites and Related Magmas From the Finnish Segment of the Karelian Craton

Dalton

Giuliani

Hergt

et al. 2022

Geochem Geophys Geosyst

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Despite the scientific and economic significance of kimberlites and related magmas, their origin is unclear. Here, we address this issue using whole‐rock and perovskite‐derived Sr‐Nd‐Hf isotopes for the three occurrences of kimberlite, lamproites and ultramafic lamprophyres (UMLs) in Finland. Mesoproterozoic olivine lamproites at Lentiira‐Kuhmo and UMLs at Kuusamo have different isotopic signatures yet were emplaced contemporaneously at 1,200 Ma in response to an extensional regime linked to the Baltica‐Laurentia breakup. The low εNd(i) and εHf(i) values of the olivine lamproites are consistent with an enriched subcontinental lithospheric mantle (SCLM) source while UML compositions are intermediate between those of typical kimberlites and lamproites and are interpreted to reflect mixing of asthenospheric melts and ∼10%–15% of melts sourced from metasomatized SCLM. The ∼750 Ma Kuusamo kimberlites, are probably linked to the mantle plume activity that initiated Rodinia's break‐up, exhibiting homogenous isotopic compositions which mirror the prominent Geodynamic and Source Constraints for ∼1,200 Ma Olivine Lamproite and Ultramafic Lamprophyre Magmatism in Eastern Finland (PREMA)‐like signature of kimberlites globally. By contrast, ∼620–585 Ma Kaavi‐Kuopio kimberlites show limited range in εNd(i) and 87Sr/86Sr(i) but have remarkably heterogeneous εHf(i) (+6.5 to −6.3) with a temporal trend toward lower εHf(i) values. While the Kuusamo kimberlites erupted during the early stage of continental break‐up, the Kaavi‐Kuopio kimberlites were emplaced when Rodinia break‐up was completed, coeval with formation of the Central Iapetus large igneous province. Magmas forming the Kaavi‐Kupio kimberlites may have formed from an upwelling mantle source similar to PREMA modified by increasing incorporation (up to 10%) of recycled crustal material through time accounting for the trend toward lower εHf(i) in these kimberlites.

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“…Mineral composition data from Dalton, Giuliani, O'Brien, et al. (2020), age data from Dalton, Giuliani, Phillips, et al. (2020).…”

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: The Role Of Lithospheric Assimilationmentioning

confidence: 96%

mentioning

confidence: 99%

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Geodynamic and Isotopic Constraints on the Genesis of Kimberlites, Lamproites and Related Magmas From the Finnish Segment of the Karelian Craton

Dalton

Giuliani

Hergt

et al. 2022

Geochem Geophys Geosyst

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“…Bulk-rock CO 2 contents were measured in most (n = 79) of the samples analyzed for their bulk-carbonate carbon and oxygen isotope compositions (table S1). For two subsets of samples (those from India and Finland), bulk-rock CO 2 contents had previously been reported (table S1) (68)(69)(70). CO 2 concentrations in finely ground powders were measured by infrared (IR) spectroscopy at ETH Zurich using a LECO CS844 carbon and sulfur analyzer.…”

Section: Determinations Of Bulk-sample Co 2 Concentrationsmentioning

confidence: 99%

Perturbation of the deep-Earth carbon cycle in response to the Cambrian Explosion

et al. 2022

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Earth’s carbon cycle is strongly influenced by subduction of sedimentary material into the mantle. The composition of the sedimentary subduction flux has changed considerably over Earth’s history, but the impact of these changes on the mantle carbon cycle is unclear. Here, we show that the carbon isotopes of kimberlite magmas record a fundamental change in their deep-mantle source compositions during the Phanerozoic Eon. The 13 C/ 12 C of kimberlites before ~250 Ma preserves typical mantle values, whereas younger kimberlites exhibit lower and more variable ratios—a switch coincident with a recognized surge in kimberlite magmatism. We attribute these changes to increased deep subduction of organic carbon with low 13 C/ 12 C following the Cambrian Explosion when organic carbon deposition in marine sediments increased significantly. These observations demonstrate that biogeochemical processes at Earth’s surface have a profound influence on the deep mantle, revealing an integral link between the deep and shallow carbon cycles.

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Temperature and oxygen state of kimberlite magma from the North China Craton and their implication for diamond survival

Zhu

Wang

et al. 2021

Miner Deposita

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The role of lithospheric heterogeneity on the composition of kimberlite magmas from a single field: The case of Kaavi-Kuopio, Finland

Cited by 35 publications

References 74 publications

Geodynamic and Isotopic Constraints on the Genesis of Kimberlites, Lamproites and Related Magmas From the Finnish Segment of the Karelian Craton

Geodynamic and Isotopic Constraints on the Genesis of Kimberlites, Lamproites and Related Magmas From the Finnish Segment of the Karelian Craton

Perturbation of the deep-Earth carbon cycle in response to the Cambrian Explosion

Temperature and oxygen state of kimberlite magma from the North China Craton and their implication for diamond survival

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