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Introduction to Mineralogy Dr. Tark Hamilton Chapter 5: Lecture 17 Earth’s Chemistry & Minerals

Introduction to Mineralogy Dr. Tark Hamilton Chapter 5: Lecture 17 Earth’s Chemistry & Minerals. Camosun College GEOS 250 Lectures: 9:30-10:20 M T Th F300 Lab: 9:30-12:20 W F300. Ternary Plot: Feldspar Composition. Sanidine. Solvus. Alkali Feldspars. Anorthoclase. Plagioclase.

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Introduction to Mineralogy Dr. Tark Hamilton Chapter 5: Lecture 17 Earth’s Chemistry & Minerals

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  1. Introduction to MineralogyDr. Tark HamiltonChapter 5: Lecture 17Earth’s Chemistry & Minerals Camosun College GEOS 250 Lectures: 9:30-10:20 M T Th F300 Lab: 9:30-12:20 W F300

  2. Ternary Plot: Feldspar Composition Sanidine Solvus Alkali Feldspars Anorthoclase Plagioclase

  3. Subdivisions of Earth’s interior Oxygen 94% 8 Elements=99% Olivine “spinel” Granodiorite “Perovskite” Fe98% Ni2% Fe80% Ni20% Peridotite 1Kbar = 100 MPa

  4. Widmanstaaten pattern: “Gibeon” meteorite, Namibia, FeNi (111) exsolution

  5. The “Big 8” Elements:Earth’s Crust Waters: (Na+ >Ca+2 >K+ >Mg+2 >Fe+2 >SiO2 ) & [Cl- >(HCO3) - >(SO4)-2] TDS<3ppt Cumulative Cation Pore Volume Estimates from Till & Crustal Rocks

  6. Elemental composition of Crust

  7. Alta’ameem Meteorite, Iraq: Chromite, Ilmentite, Troilite

  8. Apollo 12 Oceanus ProcellarumBasalt: Chromite, Ulvospinel, FeNi Pyroxene Plagioclase

  9. Garnet Peridotite: Alp Arami SZ Woudloper

  10. Phase Transitions: Peridotite olivine Spinel perovskite

  11. Pressure compresses Volume

  12. Perovskite: CaTiO3 Structure Si4+ Al3+ Ca2+ Mg2+ Fe2+

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