Trace element mobility in alteration zones associated with Archean Au lode deposits

J. N. Ludden, R. Daigneault, Francois Robert, R. P. Taylor

Research output: Contribution to journalArticle

Abstract

Porphyry dikes from the Sigma and Lamaque mines, Val d'Or, Quebec. Two types of alteration: cryptic alteration (ubiquitous to all quartz-tourmaline veins) involves a 1- to 2-m region of sericitization and incipient carbonatization; visible alteration involves destruction of all mafic mineral phases and precipitation of calcite, apatite, and Ti oxides in addition to pyritization. In all examples visible alteration is adjacent to tourmaline-rich zones in the quartz-tourmaline veins. Considerable enrichments and fractionation of the light, middle, and heavy rare earth elements and Ti, P, Zr, Y, Hf, U, and Ta abundances are observed, while Rb, Sr, Sc, and Al are depleted. The cryptic alteration zone is characterized by rare earth element leaching and probably represents a low pH environment of incipient sericitic alteration.--Modified journal abstract.
Original languageEnglish
Pages (from-to)1131-1141
Number of pages11
JournalEconomic Geology
Volume79
Issue number5
DOIs
Publication statusPublished - 1 Aug 1984

ASJC Scopus subject areas

  • Geophysics
  • Geology
  • Geochemistry and Petrology
  • Economic Geology

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