Textural analysis of strongly altered kimberlite: examples from the Ekati Diamond Mine, Northwest Territories, Canada

Lucy Porritt, Raymond Alexander Fernand Cas, Bruce Franklin Schaefer, Stafford McKnight

    Research output: Contribution to journalArticleResearchpeer-review

    11 Citations (Scopus)

    Abstract

    Two massive, poorly sorted pyroclastic kimberlite deposits from the Fox and Koala pipes at the Ekati diamond mine, Northwest Territories, Canada present different styles of alteration. The first, at Fox, has an interstitial medium-alteration assemblage dominated by saponite, serpentine (lizardite), and microlitic diopside. The second, at Koala, has an alteration assemblage of serpentine (antigorite), carbonate, and minor saponite. They share the following sequence of events. Fine-grained matrix material has been serpentinized and replaced to varying degrees within each deposit, and the proportions of the preserved mineralogy of the interstitial medium reflect the nature and degree of alteration. Fine kimberlite ash is likely to have been hydrated and serpentinized soon after deposition by volcanic fluids percolating through the kimberlite vent fill deposits. Replacement, dissolution, and infilling of primary and secondary pore space are commonly observed textural features, and indicate that several phases of alteration have occurred, either as distinct episodes or, more likely, as part of a progressive sequence.
    Original languageEnglish
    Pages (from-to)625 - 641
    Number of pages17
    JournalCanadian Mineralogist
    Volume50
    Issue number3
    DOIs
    Publication statusPublished - 2012

    Cite this

    @article{b18a705021a8495b829a4fecd5b7ae12,
    title = "Textural analysis of strongly altered kimberlite: examples from the Ekati Diamond Mine, Northwest Territories, Canada",
    abstract = "Two massive, poorly sorted pyroclastic kimberlite deposits from the Fox and Koala pipes at the Ekati diamond mine, Northwest Territories, Canada present different styles of alteration. The first, at Fox, has an interstitial medium-alteration assemblage dominated by saponite, serpentine (lizardite), and microlitic diopside. The second, at Koala, has an alteration assemblage of serpentine (antigorite), carbonate, and minor saponite. They share the following sequence of events. Fine-grained matrix material has been serpentinized and replaced to varying degrees within each deposit, and the proportions of the preserved mineralogy of the interstitial medium reflect the nature and degree of alteration. Fine kimberlite ash is likely to have been hydrated and serpentinized soon after deposition by volcanic fluids percolating through the kimberlite vent fill deposits. Replacement, dissolution, and infilling of primary and secondary pore space are commonly observed textural features, and indicate that several phases of alteration have occurred, either as distinct episodes or, more likely, as part of a progressive sequence.",
    author = "Lucy Porritt and Cas, {Raymond Alexander Fernand} and Schaefer, {Bruce Franklin} and Stafford McKnight",
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    language = "English",
    volume = "50",
    pages = "625 -- 641",
    journal = "Canadian Mineralogist",
    issn = "0008-4476",
    publisher = "Mineralogical Association of Canada",
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    Textural analysis of strongly altered kimberlite: examples from the Ekati Diamond Mine, Northwest Territories, Canada. / Porritt, Lucy; Cas, Raymond Alexander Fernand; Schaefer, Bruce Franklin; McKnight, Stafford.

    In: Canadian Mineralogist, Vol. 50, No. 3, 2012, p. 625 - 641.

    Research output: Contribution to journalArticleResearchpeer-review

    TY - JOUR

    T1 - Textural analysis of strongly altered kimberlite: examples from the Ekati Diamond Mine, Northwest Territories, Canada

    AU - Porritt, Lucy

    AU - Cas, Raymond Alexander Fernand

    AU - Schaefer, Bruce Franklin

    AU - McKnight, Stafford

    PY - 2012

    Y1 - 2012

    N2 - Two massive, poorly sorted pyroclastic kimberlite deposits from the Fox and Koala pipes at the Ekati diamond mine, Northwest Territories, Canada present different styles of alteration. The first, at Fox, has an interstitial medium-alteration assemblage dominated by saponite, serpentine (lizardite), and microlitic diopside. The second, at Koala, has an alteration assemblage of serpentine (antigorite), carbonate, and minor saponite. They share the following sequence of events. Fine-grained matrix material has been serpentinized and replaced to varying degrees within each deposit, and the proportions of the preserved mineralogy of the interstitial medium reflect the nature and degree of alteration. Fine kimberlite ash is likely to have been hydrated and serpentinized soon after deposition by volcanic fluids percolating through the kimberlite vent fill deposits. Replacement, dissolution, and infilling of primary and secondary pore space are commonly observed textural features, and indicate that several phases of alteration have occurred, either as distinct episodes or, more likely, as part of a progressive sequence.

    AB - Two massive, poorly sorted pyroclastic kimberlite deposits from the Fox and Koala pipes at the Ekati diamond mine, Northwest Territories, Canada present different styles of alteration. The first, at Fox, has an interstitial medium-alteration assemblage dominated by saponite, serpentine (lizardite), and microlitic diopside. The second, at Koala, has an alteration assemblage of serpentine (antigorite), carbonate, and minor saponite. They share the following sequence of events. Fine-grained matrix material has been serpentinized and replaced to varying degrees within each deposit, and the proportions of the preserved mineralogy of the interstitial medium reflect the nature and degree of alteration. Fine kimberlite ash is likely to have been hydrated and serpentinized soon after deposition by volcanic fluids percolating through the kimberlite vent fill deposits. Replacement, dissolution, and infilling of primary and secondary pore space are commonly observed textural features, and indicate that several phases of alteration have occurred, either as distinct episodes or, more likely, as part of a progressive sequence.

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