Earth Sciences 1070A/B Lecture 10: Unit 10

• School: Western University
• Department: Earth Sciences
• Course: Earth Sciences 1070A/B
• Professor: Natalie Pietrzak- Renaud

Document Summary

Form due to magmatic processes generate large vol. of mafic to intermediate magma. South africa formed by divergent plate. Bush(cid:448)eld stratifor(cid:373) deposit (cid:272)o(cid:373)prises a(cid:271)out 90% of (cid:449)orld"s k(cid:374)o(cid:449)(cid:374) chromium reserves. Large reser(cid:448)e for ti(cid:374), iro(cid:374), tita(cid:374)iu(cid:373) a(cid:374)d (cid:448)a(cid:374)adiu(cid:373) a(cid:374)d (cid:449)orld"s largest reserve of pges (platinum) Bushveld chromite, pyrrhotite, pentlandite, and pyrite. Ring of fire rich in cr etc. Sulphur based liquids do not mix with silicate melts / magma (oil & water: metals (iron, nickel, copper etc) react with sulphur fluid and crystallize sulphide minerals, silica magma = crystallize silicate gangue minerals. Sulphide rich ore bodies with associated w plutonic bodies. Sudbury ni-cu: hot spot or related activity or, melt processes that were initiated or influenced by meteor. Diamond deposits: igneous deposits, important as an abrasive, gemstone diamonds minor occurrence (1/4 of mined diamonds, majority found in kimberlite. Has to be quick or diamond would turn to graphite.