Stratigraphy of the intra-crater volcaniclastic deposits of the Victor Northwest kimberlite, northern Ontario, Canada

Straaten, Bram I. van; Kopylova, Maya G.; Russell, James K.; Webb, Kimberley; Smith, B. Holly

doi:10.1016/j.lithos.2009.06.010

Cited by 17 publications

(33 citation statements)

References 11 publications

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“…De Beers Canada Inc. is currently mining the Victor kimberlite pipes for diamonds. The Victor diamond deposit comprises several cross-cutting and adjacent steep-sided kimberlite pipes (Webb et al 2004;van Straaten et al 2008van Straaten et al , 2009), emplaced within a ∼275 m thick Ordovician to Silurian sedimentary sequence which overlies Precambrian granitoid basement (Fig. 1).…”

Section: Geology Of the Victor Kimberlitementioning

confidence: 99%

“…The Victor Northwest pipe is crosscut by the later Victor Main pipe (Fig. 1;van Straaten et al 2009). …”

Section: Geology Of the Victor Kimberlitementioning

confidence: 99%

“…1). The intra-pipe stratigraphy was the focus of a previous study (van Straaten et al 2009) and is summarised here. The internal geology of the VNW kimberlite pipe has been reconstructed using a total of 22 drill cores (Fig.…”

Section: Geology Of the Victor Kimberlitementioning

confidence: 99%

“…The internal geology of the VNW kimberlite pipe has been reconstructed using a total of 22 drill cores (Fig. 2;van Straaten et al 2009) with a total cumulative length of ∼4.2 km. The average collar elevation of drill holes in VNW is 83.3 m above sea level.…”

Section: Geology Of the Victor Kimberlitementioning

confidence: 99%

“…From these examples, it is clear that there is a complete continuum between effusive lava flows, lava fountain-fed clastogenic lavas, lava-like pyroclastic deposits to non-welded pyroclastic deposits. Reconstitution of hot pyroclastic material has only recently been suggested as a possible mechanism for forming coherent extrusive kimberlite deposits (Webb et al 2004;Sparks et al 2006;Brown et al 2008;Nowicki et al 2008;Crawford et al 2009;van Straaten et al 2009). …”

Section: Introductionmentioning

confidence: 99%

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A rare occurrence of a crater-filling clastogenic extrusive coherent kimberlite, Victor Northwest (Ontario, Canada)

et al. 2011

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Kimberlite pipes can contain significant proportions of dark and dense kimberlite that have mostly been interpreted as intrusive coherent (hypabyssal) in origin. This study reports a well-documented occurrence of a fresh intra-crater clastogenic extrusive coherent kimberlite that is concluded to have formed as a result of lava fountaining. This paper focuses on a dark, dense, competent, generally crystal-rich, massive kimberlite unit within the Victor Northwest kimberlite pipe (Ontario, Canada). Using a comprehensive volcanological and petrographic analysis of all available drill cores, it is shown that this unit has a fresh well-crystallised coherent groundmass and is extrusive and pyroclastic in origin. The proposed clastogenic coherent extrusive origin is based on deposit morphology, gradational contacts to enveloping pyroclastic units, as well as the presence of remnant pyroclast outlines and angular broken olivines. This paper, and an increasing number of other studies, suggest that fragmental extrusive coherent kimberlite in intra-crater settings may be more common than previously thought. The emplacement history and volcanology of these pipes need to be reconsidered based on the emerging importance of this particular kimberlite facies.

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Section: Geology Of the Victor Kimberlitementioning

confidence: 99%

“…The Victor Northwest pipe is crosscut by the later Victor Main pipe (Fig. 1;van Straaten et al 2009). …”

Section: Geology Of the Victor Kimberlitementioning

confidence: 99%

Section: Geology Of the Victor Kimberlitementioning

confidence: 99%

Section: Geology Of the Victor Kimberlitementioning

confidence: 99%