Laser-ablation ICP-MS micro-analysis of calcite cement from a Mississippi-Valley-type Zn-Pb deposit, Nova Scotia

dramatic variability in REE content on macro- and micro-scales

D. J. Kontak, S. Jackson

    Research output: Contribution to journalArticle

    20 Citations (Scopus)

    Abstract

    Gays River is a Mississippi-Valley-type (MVT) Zn-Pb deposit in Nova Scotia, hosted by Visean-age dolomitized carbonates; the mineralization, formed at ca. 300 Ma, is due to infiltration and replacement of the host-rock dolostone by heated, saline brines. Isotopic data indicate that the mineralizing fluids equilibrated with rocks of the Meguma Group, either as detritus within the Devono-Carboniferous Horton Group or in the underlying basement. The proportion of the REE of five different types of syn- to post-mineralization calcite cement has been determined via solution chemistry and a laser-ablation microanalysis (LAM) - inductively coupled plasma - mass spectrometry (ICP-MS) technique. The LAM results indicate a large variation in ΣREE (from 1000 to <1 times chondrite) and degree of fractionation. The elevated REE contents of calcite are inherited from the infiltrating fluids that equilibrated with Meguma Group detritus in the Horton Group, whereas relatively depleted REE values reflect buffering by the wallrock. Closed-system fractionation of the REE can account for the variable (La/Lu)N values that characterize calcite with lower REE contents. -Authors

    Original languageEnglish
    Pages (from-to)445-467
    Number of pages23
    JournalCanadian Mineralogist
    Volume33
    Issue number2
    Publication statusPublished - 1995

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