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Geochemical evidence for magmatic fluids in porphyry copper mineralization - Part II. Ion-probe analysis of Cu contents of mafic minerals, Koloula Igneous Complex

Journal Article


Abstract


  • The Cu contents of biotites (av. 880 ppm), amphiboles (16 ppm) and magnetites (160 ppm) from barren intrusions of the Koloula Igneous Complex are significantly greater than the Cu contents of the same minerals from unaltered mineralizing intrusions (av. 23, 6, and 20 ppm respectively). The Cu content of amphiboles from mineralizing intrusions is strongly domain-dependent, with Cu (and chlorine) being depleted in compositional domains that formed during intermittent boiling of hydrothermal fluids. The conversion of pyroxene to amphibole is an unlikely process for the release of Cu. Owing to the differences in Cu contents of biotite, amphibole, and magnetite, mineralizing rock types from the Koloula Igneous Complex are depleted in Cu compared to barren intrusions by 60 ppm, of which 57 ppm is attributable to biotite, 0.5 ppm to amphibole, and 2 ppm to magnetite. Partitioning of the amount of Cu measured here into the fluid phase during boiling is potentially large enough to produce porphyry copper orebodies. The high Cu-contents of minerals from barren rocks suggest that igneous complexes that are hosts for porphyry copper deposits may be anomalously enriched in that metal. © 1981 Springer-Verlag.

UOW Authors


  •   Chivas, Allan (external author)

Publication Date


  • 1982

Citation


  • Hendry, D. A. F., Chivas, A. R., Reed, S. J. B., & Long, J. V. P. (1982). Geochemical evidence for magmatic fluids in porphyry copper mineralization - Part II. Ion-probe analysis of Cu contents of mafic minerals, Koloula Igneous Complex. Contributions to Mineralogy and Petrology, 78(4), 404-412. doi:10.1007/BF00375202

Scopus Eid


  • 2-s2.0-0019661678

Web Of Science Accession Number


Start Page


  • 404

End Page


  • 412

Volume


  • 78

Issue


  • 4

Abstract


  • The Cu contents of biotites (av. 880 ppm), amphiboles (16 ppm) and magnetites (160 ppm) from barren intrusions of the Koloula Igneous Complex are significantly greater than the Cu contents of the same minerals from unaltered mineralizing intrusions (av. 23, 6, and 20 ppm respectively). The Cu content of amphiboles from mineralizing intrusions is strongly domain-dependent, with Cu (and chlorine) being depleted in compositional domains that formed during intermittent boiling of hydrothermal fluids. The conversion of pyroxene to amphibole is an unlikely process for the release of Cu. Owing to the differences in Cu contents of biotite, amphibole, and magnetite, mineralizing rock types from the Koloula Igneous Complex are depleted in Cu compared to barren intrusions by 60 ppm, of which 57 ppm is attributable to biotite, 0.5 ppm to amphibole, and 2 ppm to magnetite. Partitioning of the amount of Cu measured here into the fluid phase during boiling is potentially large enough to produce porphyry copper orebodies. The high Cu-contents of minerals from barren rocks suggest that igneous complexes that are hosts for porphyry copper deposits may be anomalously enriched in that metal. © 1981 Springer-Verlag.

UOW Authors


  •   Chivas, Allan (external author)

Publication Date


  • 1982

Citation


  • Hendry, D. A. F., Chivas, A. R., Reed, S. J. B., & Long, J. V. P. (1982). Geochemical evidence for magmatic fluids in porphyry copper mineralization - Part II. Ion-probe analysis of Cu contents of mafic minerals, Koloula Igneous Complex. Contributions to Mineralogy and Petrology, 78(4), 404-412. doi:10.1007/BF00375202

Scopus Eid


  • 2-s2.0-0019661678

Web Of Science Accession Number


Start Page


  • 404

End Page


  • 412

Volume


  • 78

Issue


  • 4