| Titre | Application of indicator minerals to identify fertile porphyry and epithermal ore systems |
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| Auteur | Lee, R G; Baker, S; Bouzari, R; Plouffe, A |
| Source | AME Roundup 2022; 2022 p. 1 |
| Image |  |
| Année | 2022 |
| Séries alt. | Ressources naturelles Canada, Contribution externe 20210402 |
| Éditeur | Association of Mineral Exploration of British Columbia |
| Réunion | AME Roundup 2022; janvier 31-février 3, 2022 |
| Document | livre |
| Lang. | anglais |
| Media | numérique |
| Formats | pdf |
| Sujets | prospection minière; potentiel minier; méthodes d'exploration; gisements minéraux; gisements porphyriques; gîtes épithermaux; genèse des minerais; minéralisation; associations de minéraux; cadre
tectonique; magmatisme; système hydrothermal; dynamique des fluides; métasomatose; altération hydrothermale; géologie du substratum rocheux; sediments; Cordillère canadienne; géologie économique; minéralogie; géochimie; géologie des dépôts
meubles/géomorphologie; géologie régional; Sciences et technologie; Nature et environnement |
| Programme | Initiative géoscientifique ciblée (IGC-6) Systèmes minéralisés |
| Diffusé | 2022 02 01 |
| Résumé | (disponible en anglais seulement)
Indicator minerals as applied to exploration are those minerals that are either directly linked to mineralization or have trace element composition and textural
characterization that record the presence of a magmatic hydrothermal fluid that formed an ore deposit. Successful discoveries of diamondiferous kimberlites and critical mineral deposits using indicator minerals testify to their usefulness in the
exploration toolbox. The large-scale footprint of porphyry and epithermal systems and the numerous types of indicator minerals present within these systems make it challenging to apply a consistent mineralogical study approach for exploration. In
porphyry systems, indicator minerals can include ore (e.g. chalcopyrite, gold grains, molybdenite), magmatic (e.g. zircon, apatite, titanite, rutile, plagioclase) or hydrothermal alteration minerals (chlorite, epidote, apatite, titanite, rutile,
magnetite, pyrite, hematite, andalusite, mica, albite, K-feldspar). These minerals also form in rocks barren of mineralization. It can be challenging to interpret the subtle changes in mineral composition and texture to determine if they were
derived from potential porphyry deposits.
This talk discusses recent research on indicator minerals from porphyry deposits in the North American Cordillera and selected districts worldwide. Critical features in indicator mineral chemistry and
texture can help identify potential targets with minerals such as zircon and apatite, providing a temporal history of the source magma and magmatic fluids. Distally, chlorite and epidote composition changes discriminate large-scale provenance
metasomatism from porphyry hydrothermal alteration. Sampling resistate indicator minerals both in bedrock and detrital catchment provide means to fingerprint ore bodies and drive targeted exploration vectoring. The application of indicator minerals
to identify porphyry systems is a valid approach to exploration when using the correct sampling scale, analytical equipment, and modelling interpretations. |
| Sommaire | (Résumé en langage clair et simple, non publié)
Il s'agit d'un résumé d'un exposé qui sera présenté à la conférence Roundup de l'AMEBC en janvier 2022. L'exposé présentera l'application de
minéraux indicateurs de la présence potentielle de minéralisation cuprifère dans la Cordillère canadienne. |
| GEOSCAN ID | 329232 |
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