2018
DOI: 10.1007/s00710-018-0607-6
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Origin of complex zoning in olivine from diverse, diamondiferous kimberlites and tectonic settings: Ekati (Canada), Alto Paranaiba (Brazil) and Kaalvallei (South Africa)

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Cited by 53 publications
(19 citation statements)
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“…2). These features indicate derivation of olivine cores from the disaggregation of typical mantle peridotites, as well as other mantle lithologies that are more enriched in Fe, i.e., megacrysts and some sheared peridotites (10,(19)(20)(21)(22)(23)(24)(25), which derive from complex processes of hybridization between earlier kimberlite (or related) melts and peridotite wall rocks [e.g., (26)(27)(28)]. Some cores could also derive from the crystallization of failed (29,30) or from disaggregation of "replacive" dunites where interaction with earlier kimberlite melts promoted olivine formation at the expense of other silicate phases (31).…”
Section: Olivine Composition In Kimberlitesmentioning
confidence: 99%
See 1 more Smart Citation
“…2). These features indicate derivation of olivine cores from the disaggregation of typical mantle peridotites, as well as other mantle lithologies that are more enriched in Fe, i.e., megacrysts and some sheared peridotites (10,(19)(20)(21)(22)(23)(24)(25), which derive from complex processes of hybridization between earlier kimberlite (or related) melts and peridotite wall rocks [e.g., (26)(27)(28)]. Some cores could also derive from the crystallization of failed (29,30) or from disaggregation of "replacive" dunites where interaction with earlier kimberlite melts promoted olivine formation at the expense of other silicate phases (31).…”
Section: Olivine Composition In Kimberlitesmentioning
confidence: 99%
“…The homogeneous Mg# value of olivine rims in each kimberlite implies that this parameter is insensitive to fractional crystallization, which is known to modify the composition of kimberlite and other magmas [e.g., (16)]. Furthermore, Lim et al (25) recently showed that, in kimberlites from different continents, the Mg# of olivine rims is correlated with the abundance of magmatic phases (phlogopite and Fe-Ti oxides) in the kimberlite matrix, which largely crystallize upon magma emplacement in the upper crust. These lines of evidence suggest that olivine rim Mg# values can be used as proxies of kimberlite melt compositions after ascent through the lithospheric mantle.…”
Section: Olivine Composition In Kimberlitesmentioning
confidence: 99%
“…Several recent publications have concluded that the cores of all kimberlitic olivines are xenocrysts, derived from disaggregated 26 48 mantle peridotites, and that only the outer rims crystallized from the host magma (e.g. Kamenetsky 28 29 49 et al, 2008;Brett et al, 2009;Arndt et al, 2010;Lim et al, 2018). In contrast, Moore (1988;2012; 58 to understand the processes responsible for producing kimberlite magmas.…”
mentioning
confidence: 99%
“…(Druiventak, et al, 2011). Further, 48 305 temperatures (20 -600 49 306 low-Ca olivine tends to be more readily deformed, as high Ca contents in olivine creates the so50 307 called "solute drag" effect, preventing deformations (Yao et al, 2017 (Yudovskaya et al, 2013, 2018, Yao et al, 2017…”
mentioning
confidence: 99%
“…xenocristalina no magma hospedeiro, os xenocristais preservam as características químicas das rochas parentais, podendo agir, portanto como uma ferramenta para medição de composições próximas do manto litosférico (Shaikh, 2018). Cristais zonados de olivina (0,5 -5mm) com duas diferentes populações de núcleos, uma com núcleos enriquecidos em Mg e outra com núcleos enriquecidos em Fe, são amplamente reconhecidas em diversos kimberlitos mundo afora (Bussweiler et al, 2015;Howarth & Taylor, 2016;Lim et al, 2018). Os núcleos enriquecidos em Mg são em geral interpretados como derivados de xenólitos do manto (Arndt et al, 2010;Brett et al, 2009;Pilbeam et al, 2013), enquanto núcleos enriquecidos em Fe são considerados "fenocristais cognatos" geneticamente relacionados a fundidos de protokimberlitos/lamproítos (Howarth & Taylor, 2016;Kamenetsky et al, 2008;Shaikh et al, 2018).…”
Section: Introductionunclassified