Primitive Magma From the Jericho Pipe, N.W.T., Canada: Constraints on Primary Kimberlite Melt Chemistry

Price, S. E.; Russell, James K.; Kopylova, Maya G.

doi:10.1093/petrology/41.6.789

Cited by 204 publications

(113 citation statements)

References 33 publications

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“…(Table 1), melts compositions from the orthopyroxene-bearing experiments at 2.5 GPa (DPO-RS-002) and 4.5 GPa (DPO-RS-004), and the composition of the DP carbonatite after the assimilation of orthopyroxene and exsolution of CO 2 . The green circles represent a range of kimberlite compositions from previous studies (Price et al 2000;Le Roex et al 2003;Harris et al 2004;Kjarsgaard et al 2009;Kopylova et al 2009;Russell et al 2012) (Supplementary Table 4). The dashed line shows the effect of orthopyroxene assimilation on the composition of the DP carbonatite in the 2.5 GPa experiment, and the dotted line shows the effect clinopyroxene assimilation would have at lower pressure…”

Section: Resultsmentioning

confidence: 99%

Orthopyroxene survival in deep carbonatite melts: implications for kimberlites

Stone

Luth

2016

Contrib Mineral Petrol

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Section: Resultsmentioning

confidence: 99%

Orthopyroxene survival in deep carbonatite melts: implications for kimberlites

Stone

Luth

2016

Contrib Mineral Petrol

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“…Various models in vogue place their sources in (i) the subcontinental lithospheric mantle (SCLM) (e.g., Tainton and McKenzie 1994, Chalapathi Rao et al 2004, Becker & Le Roex 2006), (ii) convecting (asthenospheric) mantle (e.g., Price et al 2000, Griffin et al 2000, Mitchell 2008), (iii) the transitional zone (e.g., Ringwood et al 1992, Nowell et al 2004, Gaffney et al 2007, Paton et al 2007, and (iv) the core-mantle boundary (e.g., Haggerty 1999).…”

Section: Petrogenesismentioning

confidence: 99%

Mineralogy and Geochemistry of Kimberlites Nk-2 and Kk-6, Narayanpet Kimberlite Field, Eastern Dharwar Craton, Southern India: Evidence for a Transitional Kimberlite Signature

Rao

Dongre²

2009

The Canadian Mineralogist

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We have carried out a mineralogical and geochemical study on two previously uncharacterized kimberlites of coherent facies, NK-2 and KK-6, from the Narayanpet kimberlite field (NKF), Eastern Dharwar craton (EDC), southern India. Both these kimberlites have a distinct inequigranular texture resulting from two generations of variously sized olivine macrocrysts and groundmass microphenocrysts. Other groundmass phases include clinopyroxene (diopside), serpentine, phlogopite, calcite, spinel, perovskite and apatite. Electron-microprobe analyses of various groundmass minerals support their kimberlitic affinity. Primitive Mg-numbers, Ni and Cr contents and high enrichment in incompatible trace elements are hallmarks of these kimberlites. From major-and trace-element geochemistry, crustal contamination seems to be minimal. The LILE and HFSE display excellent correlations amongst themselves and also with each other, thereby implying limited effects of post-emplacement hydrothermal alteration. Ratios of highly mobile and immobile incompatible trace elements (e.g., La, Ce, Nb, Ba, Pb and Th) strongly resemble those of transitional kimberlites of southern Africa and are confined to the arrays of mixing lines between Group-I and Group-II kimberlites. The REE abundances of NK-2 and KK-6 kimberlites suggest variable degrees of partial melting. Petrogenetic modeling depicts them to be products of a greater degree of melting. A mixed Group-I and Group-II "southern African" kimberlite source is inferred for the generation of NK-2 and KK-6 magmas, as well as for several other EDC kimberlites. This can explain several overlapping petrological and geochemical characters of Group-I and Group-II kimberlites displayed by the kimberlites of southern India. Lower whole-rock Ti and Fe contents in the NK-2 and KK-6, compared to those in other non-diamondiferous kimberlites from the NKF, suggests that they are promising diamond prospects; we recommend their bulk processing.

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“…The entrainment of, and reaction with, xenoliths and xenocrysts spanning the entire lithosphere greatly complicates the search for the primary kimberlite melt, and the picture is further obscured by post-emplacement alteration (Mitchell 1 3 1986(Mitchell 1 3 , 1995Price et al 2000;Kopylova et al 2007;Sparks et al 2009;Kjarsgaard et al 2009). Two of the key issues in kimberlite research that are still debated are as follows:…”

Section: Introductionmentioning

confidence: 99%

The evolution of calcite-bearing kimberlites by melt-rock reaction: evidence from polymineralic inclusions within clinopyroxene and garnet megacrysts from Lac de Gras kimberlites, Canada

Bussweiler

Stone

Pearson

et al. 2016

Contrib Mineral Petrol

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inclusion trails surround the inclusions. In Cr-pyropes, the inclusions additionally contain Al-spinel, clinopyroxene, and dolomite. The major and trace element compositions of the inclusion phases are generally consistent with the early stages of kimberlite differentiation trends. Extensive chemical exchange between the host phases and the inclusions is indicated by enrichment of the inclusions in major components of the host crystals, such as Cr 2 O 3 and Al 2 O 3 . This chemical evidence, along with phase equilibria constraints, supports the proposal that the inclusions within Cr-diopside record the decarbonation reaction: dolomitic melt + diopside → forsterite + calcite + CO 2 , yielding the observed inclusion mineralogy and producing associated (CO 2 -rich) fluid inclusions. Our study of polymineralic inclusions in megacrysts provides clear mineralogical and chemical evidence for an origin of kimberlite that involves the reaction of high-pressure dolomitic melt with diopside-bearing mantle assemblages producing a lower-pressure melt that crystallizes a calcite-dominated assemblage in the crust.

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Primitive Magma From the Jericho Pipe, N.W.T., Canada: Constraints on Primary Kimberlite Melt Chemistry

Cited by 204 publications

References 33 publications

Orthopyroxene survival in deep carbonatite melts: implications for kimberlites

Orthopyroxene survival in deep carbonatite melts: implications for kimberlites

Mineralogy and Geochemistry of Kimberlites Nk-2 and Kk-6, Narayanpet Kimberlite Field, Eastern Dharwar Craton, Southern India: Evidence for a Transitional Kimberlite Signature

The evolution of calcite-bearing kimberlites by melt-rock reaction: evidence from polymineralic inclusions within clinopyroxene and garnet megacrysts from Lac de Gras kimberlites, Canada

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