Understanding Oikocryst alteration in the Meguma Gold Districts

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Understanding Oikocryst alteration in the Meguma
Gold Districts

• By Krista Sutton
• Supervisors Rick Horne and
• Rebecca Jamieson

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What we do know

• Unknown elongate mineral aggregates in slate
• Mostly quartz, biotite, chlorite, carbonate,
  sphene, opaques
• They record fold-related strain
• Thermally derived
• Down-Dip lineation (Lok) perpendicular to bedding
  cleavage intersection (L1)

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S1- principle cleavageS2m mineral fabric
defined by aligned biotite

• What we do not know
• Type of metamorphic / metasomatic reaction
• If they link deformation to veining
• Their timing
• Basically.. ORIGIN

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The plan of attack

• Sampling in and outside of gold districts
• Map sampling locations
• Petrographic analysis
• Microprobe analysis
• Geochemical analysis
• Classification scheme of different forms
• Interpret relationships
• Interpret origin