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Mineralium Deposita

, Volume 50, Issue 3, pp 339–355 | Cite as

The Lac Des Iles Palladium Deposit, Ontario, Canada. Part II. Halogen variations in apatite

  • Paul Schisa
  • Alan Boudreau
  • Lionnel Djon
  • Arnaud Tchalikian
  • John Corkery
Article

Abstract

Analysis of apatite from the Mine Block Intrusion (MBI) of the Lac des Iles Igneous Complex shows two pronounced trends in the halogens. Apatite from relatively fresh norite and melanorites from the Pd-sulfide zone contain up to 57 mol% chlorapatite endmember with significant hydroxyapatite component. In contrast, in altered rock (amphibolite and greenschist assemblages) the chlorapatite component is typically less than 10 mol% with wide variation in the F- and OH-endmember components. The latter trend is attributed to Cl loss to degassing and alteration, whereas the former is attributed to Cl enrichment in the ore-bearing rocks. It is suggested that the relatively H2O-rich and intermediate Cl content of the early igneous fluids degassed from the deeper levels of the MBI can explain the high Pd/Pt and Pd/Ir ratios of the deposit. A model is presented in which disseminated Pd-rich sulfides are initially introduced by a high-temperature magmatic fluid that also influenced crystallization to produce the gross modal variations of the igneous host rock. This high-temperature mineralization event was subsequently modified by the influx of late igneous and country fluids at amphibolite to greenschist conditions.

Keywords

Apatite Lac des Iles Pd Deposit Platinum-group elements 

Notes

Acknowledgments

The two Duke University authors would like to thank North American Palladium for their support of this project. This work was completed as part of a Duke University Senior Thesis by the senior author. It has been substantially improved by the efforts of two anonymous reviewers, whose efforts are very much appreciated.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2014

Authors and Affiliations

  • Paul Schisa
    • 1
  • Alan Boudreau
    • 1
  • Lionnel Djon
    • 2
  • Arnaud Tchalikian
    • 2
  • John Corkery
    • 2
  1. 1.Division of Earth & Ocean SciencesDuke UniversityDurhamUSA
  2. 2.Metals Exploration DivisionNorth American Palladium Ltd.Thunder BayCanada

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