Systematic variations in xenocryst mineral composition at the province scale, Buffalo Hills kimberlites, Alberta, Canada

Hood, C.T.; McCandless, Tom E.

doi:10.1016/j.lithos.2004.03.015

Cited by 17 publications

(15 citation statements)

References 18 publications

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“…It is now realised that peridotitic diamond associations also embrace high-Ca pyropes (G9) which characterise garnet lherzolites (e.g. Hood and McCandless, 2004;Sobolev et al, 2004). In the case of WKF kimberlites, most of which are diamondiferous, the lherzolitic composition of the majority of concentrate garnets indicates diamond crystallisation in a lherzolitic mantle.…”

Section: Occurrence Of Diamondmentioning

confidence: 99%

Major element composition of concentrate garnets in Proterozoic kimberlites from the Eastern Dharwar Craton, India: Implications on sub-continental lithospheric mantle

Patel¹,

Ravi²,

Anilkumar³

et al. 2010

Journal of Asian Earth Sciences

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Section: Occurrence Of Diamondmentioning

confidence: 99%

Major element composition of concentrate garnets in Proterozoic kimberlites from the Eastern Dharwar Craton, India: Implications on sub-continental lithospheric mantle

Patel¹,

Ravi²,

Anilkumar³

et al. 2010

Journal of Asian Earth Sciences

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“…The latter lies parallel to the boundary between harzburgitic and lherzolitic domains and it is characterized by a strong enrichment of chromium with calcium, which is considered to be as typical of garnet coexisting with both ortho-and clinopyroxene. The trend outlined by the Lages minerals lies sub-parallel, with lower Cr contents, to that recognized in some lherzolitic garnets from Jericho, Drybones Bay and Buffalo Hills kimberlites (Slave Craton, Canada: Kopylova et al 1999, Carbno and Canil 2002, Hood and McCandless 2004, which is believed to be indicative of garnets derived from spinel+garnet peridotites (Kopylova et al 2000 Ilmenite occurs as rounded or ellipsoidal discrete monomineralic nodules, ranging in size between 2 and 5 mm. In its thin section it exhibits typical mosaic-textured structures, lack of alteration and/or reaction rims, and no lamellar intergrowths with other mineral phases.…”

Section: Garnetsmentioning

confidence: 66%

The Lages diatremes: mineral composition and petrological implications

Barabino

Gomes

Traversa

2007

An. Acad. Bras. Ciênc.

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Chemical data of heavy minerals from Lages diatremes in southern Brazil have been studied with the aim of characterizing the sample source(s). Three groups of minerals are recognized: I) aluminian-chromian pyroxene, pyrope garnet and chromian spinel, which represent disaggregated fragments of spinel, spinel+garnet and garnet facies peridotite; II) low-Cr aluminian pyroxene that occurs as megacrysts are high pressure phases (7-12 kb) being crystallized from an alkaline-like evolving magma; III) low-Cr aluminian diopside of crustal origin. Evidence of carbonatitic cryptic metasomatic enrichment is shown by clinopyroxenes of Groups I and II. The data do not support a kimberlitic affinity as it has been suggested for the diatremes. Rather, they are interpreted as vents related to the alkaline magmatism affecting the area in Late Cretaceous. The alkaline parental magma of the pyroxene megacrysts was generated from a metasomatized mantle at garnet facies that incorporated fragments of the surrounding still fertile mantle. Presumably at spinel-facies level the magma began to fractionate the megacrysts, whose crystallization proceeded over a large range of falling pressure and temperature. The chemical similarities between Group III clinopyroxenes and those from the differentiated lithotypes indicate that the magma carried this mineral phase on its evolution, at crustal conditions, towards a more evolved alkaline composition. Still, a non-cognate origin for the Group III clinopyroxenes cannot be discarded.

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“…Alternately, a possible answer to this question also necessitates a re-look at the association between diamond and sub-calcic garnet as documented in some anomalous diamondiferous kimberlites. The role of a metasomatised lithospheric mantle has been invoked that may have caused destruction of diamond in the poorly diamondiferous Buffalo Hills kimberlite province, Alberta, Canada, where there is an overall paucity of mantle indicator minerals and near-absence of sub-calcic peridotitic (G10) garnet (Hood and McCandless 2004). Kimberlite itself can constitute a metasomatising agent and may destroy diamonds (McCammon et al 2001).…”

Section: Discussionmentioning

confidence: 99%

Diamond-facies chrome spinel from the Tokapal kimberlite, Indrāvati basin, central India and its petrological significance

et al. 2012

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Widespread and abundant spinel is the only primary mineral of petrogenetic significance preserved in the hydrothermally altered, crater-facies, Neoproterozoic (≥620 Ma) Tokapal kimberlite pipe that intruded the Indrā-vati basin, Bastar craton, Central India. Two distinct spinel populations occur: (i) finer-grained (<50 μm) microcrysts which are zoned from titaniferous magnesiochromitechromite to magnetite; and (ii) larger macrocrysts (>400 μm) with cores having distinctly chromium-rich (Cr 2 O 3 up to 63.67 wt%), and TiO 2 -poor (<0.68 wt%) compositions. Based on their morphology and chemical composition the macrocrysts are inferred to be disaggregated mantle xenocrysts and their compositional range extends well into the diamond stability field. However, the reported absence of diamond and other indicator minerals (such as pyrope garnet, chrome diopside and magnesian ilmenite) in the Tokapal pipe is intriguing since diamondiferous cratonic roots are indeed preserved in the Bastar craton, and also the kimberlite itself was derived from a similar source region(s) as that of the well-known diamondiferous Mesoproterozoic (ca. 1,100 Ma) kimberlites from Wajrakarur, Dharwar craton, southern India. Given the large areal extent (>550 ha) of kimberlite, there is a possibility that it contains diamonds but they were not recovered during the sampling. Alternately, highly oxidising conditions imparted by the metasomatic fluids/melts derived from (i) asthenosphere-lithosphere interaction, or (ii) the kimberlite itself might have played an important role in the destruction of diamond, and other indicator minerals.

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Systematic variations in xenocryst mineral composition at the province scale, Buffalo Hills kimberlites, Alberta, Canada

Cited by 17 publications

References 18 publications

Major element composition of concentrate garnets in Proterozoic kimberlites from the Eastern Dharwar Craton, India: Implications on sub-continental lithospheric mantle

Major element composition of concentrate garnets in Proterozoic kimberlites from the Eastern Dharwar Craton, India: Implications on sub-continental lithospheric mantle

The Lages diatremes: mineral composition and petrological implications

Diamond-facies chrome spinel from the Tokapal kimberlite, Indrāvati basin, central India and its petrological significance

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