1. Professor Bob Dymek A Little Bit About Me … Mineralogy and Petrology
Study rocks and minerals
Do geological field work

2. Where Have I Done Field Work ???
World’s Oldest Rocks
West Greenland
NW Territories
Québec
Labrador
Adirondacks
Central Kansas
Virginia
SE Missouri

3. 3.8 billion-year-old Metamorphic Rocks at Isua, West Greenland
The rocks on the left are older than
most of the dark lavas that fill the
Mare Basins on the moon !

4. EPSc118 “Geology of National Parks”
EPSc201 “Earth & the Environment”
EPSc437 “Igneous & Metamorphic
Petrology”
EPSc542 “Chemical Petrology”
For 12 years, I was the Senior Editor
for this research journal

5. “Secular Magmagenesis”
Earth History and Igneous Petrology
Ga Hadean ???
Ga Archaean
Granite-Greenstone Belts
Komatiites
Tonalite-Trondjhemite-Granodiorite (TTG) Suite
<0.6 Ga Phanerozoic
Magmatic arcs
Calc-alkaline (CA) batholiths

6. Phanerozoic CA Suites: Melting of Mantle Wedge
Archaean TTG suites:
Direct Slab Melting
Phanerozoic CA Suites:
Melting of Mantle Wedge

7. Secular Magmagenesis – Earth History and Igneous Petrology
Ga Hadean ???
Ga Archaean
Granite-Greenstone Belts
Komatiites
Tonalite-Trondjhemite-Granodiorite (TTG) Suite
Ga Proterozoic
Massif Anorthosites (~ )
Jotunite-Mangerite (AJM) Suite
<0.6 Ga Phanerozoic
Magmatic arcs
Calc-alkaline batholiths

8. Massif Anorthosites
Rocks consisting mostly of intermediate plagioclase feldspar (An40-60)
Plutons ranging from ~10 to >1,000 km2
Associated cogenetic/comagmatic plutons
Jotunite – mafic to intermediate, green, opx-bearing monzodiorite
Mangerite – intermediate to felsic, green, opx-bearing granodiorite
Elongate “belts” across Laurentia and Gondwana
Continental rifts, continent-continent collision, continental margin arcs
Approximaely half of global occurrences are found in Québec

9. Distribution of Anorthosite Massifs, NE North America
Forêt
Montmorency

10. Jotunites and Mangerites

11. J-M

18. Summary Compared with Phanerozoic Calc-Alkaline plutonic rocks,
the Proterozoic Jotunite-Mangerite suite – found only in
association with massif anorthosites – is enriched in Fe-Ti-P,
as well as high-field-strength elements (Ga, Ce, Y, Zr, Nb, Zn),
but is depleted in transition-metal trace elements (V, Cr, Ni),
and large-ion-lithophile trace elements (Rb, Th, U).
Should you join our Department, you can learn more about acquiring, interpreting, and understanding such data in
“Chemical Petrology.”