Geology of the Victor Kimberlite, Attawapiskat, Northern Ontario, Canada: cross-cutting and nested craters

Webb, Kimberley; Smith, B. Holly; Paul, Joanne L.; Hetman, C.

doi:10.1016/j.lithos.2004.03.050

Cited by 50 publications

(11 citation statements)

References 2 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…While the pipe shape is similar to the Lac De Gras kimberlites, the dominating rock types are pyroclastics deposits, with both diatreme facies (tuffisitic breccias) and hypabyssal (magmatic) kimberlite being absent. In this respect they resemble kimberlites from FALC (Webb et al, 2004). The complex geology of the Victor pipe suggests multiple stages of kimberlite emplacement, a detailed description is given in Webb et al (2004).…”

Section: Victor Kimberlite Ontariomentioning

confidence: 92%

“…In this respect they resemble kimberlites from FALC (Webb et al, 2004). The complex geology of the Victor pipe suggests multiple stages of kimberlite emplacement, a detailed description is given in Webb et al (2004).…”

Section: Victor Kimberlite Ontariomentioning

confidence: 92%

“…Well Webb et al (2004) consolidated fresh samples of magmatic kimberlite (A154-S pipe at Diavik, KIA93, Grizzly pipe at Ekati) were prepared as polished thin sections. From less consolidated material (Misery and Koala pipes at Ekati) olivines were handpicked, cut and polished for FTIR spectroscopy and EPMA (Electron Probe Micro Analysis).…”

Section: Lac De Gras Kimberlite Field Nwtmentioning

confidence: 99%

See 2 more Smart Citations

FTIR spectroscopy of OH in olivine: A new tool in kimberlite exploration

Matveev

Stachel

2007

Geochimica et Cosmochimica Acta

View full text Add to dashboard Cite

Section: Victor Kimberlite Ontariomentioning

confidence: 92%

Section: Victor Kimberlite Ontariomentioning

confidence: 92%

Section: Lac De Gras Kimberlite Field Nwtmentioning

confidence: 99%

See 1 more Smart Citation

FTIR spectroscopy of OH in olivine: A new tool in kimberlite exploration

Matveev

Stachel

2007

Geochimica et Cosmochimica Acta

View full text Add to dashboard Cite

“…The Attawapiskat kimberlites, located in the James Bay lowlands of Ontario (Figure 1), intrude a thick Phanerozoic carbonate sequence [ Fowler et al , 2001]. The kimberlite cluster at Attawapiskat includes 19 kimberlites, and 16 have been classified as diamondiferous, including the 15 ha economic Victor kimberlite [ Webb et al , 2004]. Three archetypal “Group I” crater facies kimberlite samples from the Attawapiskat kimberlite field (MacFayden, Bravo and Charlie) have been previously dated (U‐Pb perovskite) and are Jurassic, with ages in the 180–176 Ma range [ Heaman and Kjarsgaard , 2000].…”

Section: Introductionmentioning

confidence: 99%

The origin of Triassic/Jurassic kimberlite magmatism, Canada: Two mantle sources revealed from the Sr-Nd isotopic composition of groundmass perovskite

Zurevinski

Heaman

Creaser

2011

Geochem. Geophys. Geosyst.

View full text Add to dashboard Cite

[1] The crystallization ages and the Sr and Nd isotopic compositions of groundmass perovskite from a well-established, SE trending, Triassic-Jurassic corridor of kimberlite magmatism in central and eastern North America were determined to investigate the origin of this magmatism. The results obtained from kimberlite fields located along this corridor are interpreted to indicate that at least two distinct mantle sources contributed to this magmatism. The most primitive Rankin Inlet and Timiskaming kimberlites have a relatively unradiogenic strontium isotopic signature (0.7032-0.7036), interpreted to be derived from recycled and metasomatized oceanic lithosphere in the deep mantle. In contrast, the Attawapiskat and Kirkland Lake kimberlites have CHUR-like (Chondritic Uniform Reservoir) signatures (0.7040-0.7042) interpreted to have an origin in the asthenosphere. The progressive decrease in the age of magmatism from the Triassic Rankin Inlet kimberlites to the Miocene Great Meteor seamount, combined with the similarity in the isotopic composition of these diverse magmas along the proposed >3000 km long hot spot track, provides strong evidence in support of a common mantle plume origin for both the continental and oceanic components.

show abstract

“…Lithic inclusions can reach in excess of 20 vol%, many of which are highly altered and may be completely replaced mainly by serpentine and calcite. Bodies of CK can have horizontal, inclined, or vertical gradational contacts with clastic kimberlite rocks (e.g., Venetia K1 kimberlite pipe, South Africa [Kurszlaukis and Barnett 2003]; Koffiefontein, South Africa [Naidoo et al 2004]; Leslie and Pigeon pipes, Canada ; and Victor kimberlite [Webb et al 2004]). CK is commonly interpreted as an intrusive rock type and as being characteristic of, but not confined to, the "root zones" of kimberlite pipes (Hawthorne 1975;Mitchell 1986;Field and Scott Smith 1999).…”

Section: Introductionmentioning

confidence: 99%

On the Welding of Pyroclasts from Very Low-Viscosity Magmas: Examples from Kimberlite Volcanoes

Brown¹,

Buse²,

Sparks³

et al. 2008

The Journal of Geology

View full text Add to dashboard Cite

JSTOR is a not-for-profit service that helps scholars, researchers, and students discover, use, and build upon a wide range of content in a trusted digital archive. We use information technology and tools to increase productivity and facilitate new forms of scholarship. For more information about JSTOR, please contact support@jstor.org.. The University of Chicago Press is collaborating with JSTOR to digitize, preserve and extend access to The Journal of Geology. A B S T R A C TLithofacies in kimberlite pipes in southern Africa exhibit features consistent with welded pyroclastic rocks. These include flared conduit-filling geometries, abundant lithic clasts, lithic clast layers, subhorizontal clast fabrics, gradational contacts with volcaniclastic rocks and sintered and coalesced globular ash, and lapilli and melt-coated particles. The welding dynamics of kimberlite pyroclasts differ from those of glassy, vesiculated pyroclasts in silicic volcanic systems. Low melt viscosity (∼0:1 Pa s) results in the efficient separation of volatiles and melt and the breakup of magma into nonvesicular spherical droplets. The glassy state is difficult to form in silica-deficient magmas because the crystallization kinetics are fast in low-viscosity melts. Three pyroclastic lithofacies are recognized that primarily relate to the state of the initial melt phase in the pyroclasts on deposition: (1) densely welded kimberlite forms where the initial melt phase in pyroclasts remains as pure melt, coalescing almost immediately to form a degassed homogeneous melt that subsequently crystallizes and may be texturally indistinguishable from igneous kimberlite; (2) incipiently welded kimberlite forms where the melt phase in pyroclasts is mostly crystalline with some residual melt (pyroclasts are resistant to deformation but are sticky and can sinter together); and (3) nonwelded kimberlite forms where the melt phase in pyroclasts is fully crystalline on deposition. Transitions between these pyroclast conditions may be abrupt. Gradations to nonwelded deposits and overlaps in their textural features in several kimberlite pipes suggest that welded rocks may be deposited from large-scale fluidized systems. The presence of crystals and lithic clasts may inhibit compaction deformation-welding textures by the formation of hard-particle percolation networks. Similar rocks in other kimberlite pipes may turn out to be welded rocks. The processes outlined here may be generally applicable to other low-viscosity magmas.

show abstract

Geology of the Victor Kimberlite, Attawapiskat, Northern Ontario, Canada: cross-cutting and nested craters

Cited by 50 publications

References 2 publications

FTIR spectroscopy of OH in olivine: A new tool in kimberlite exploration

FTIR spectroscopy of OH in olivine: A new tool in kimberlite exploration

The origin of Triassic/Jurassic kimberlite magmatism, Canada: Two mantle sources revealed from the Sr-Nd isotopic composition of groundmass perovskite

On the Welding of Pyroclasts from Very Low-Viscosity Magmas: Examples from Kimberlite Volcanoes

Contact Info

Product

Resources

About