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B. Ronald Frost, Carol D. Frost, Patrick Hughes, and Kevin R. Chamberlain

2.67 Ga H-P granulite metamorphism in the Tetons The earliest Himalayan-type orogeny in North America. B. Ronald Frost, Carol D. Frost, Patrick Hughes, and Kevin R. Chamberlain Dept. Of Geology and Geophysics University of Wyoming. Structural provinces of the Wyoming province.

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B. Ronald Frost, Carol D. Frost, Patrick Hughes, and Kevin R. Chamberlain

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  1. 2.67 Ga H-P granulite metamorphism in the Tetons The earliest Himalayan-type orogeny in North America B. Ronald Frost, Carol D. Frost, Patrick Hughes, and Kevin R. Chamberlain Dept. Of Geology and Geophysics University of Wyoming

  2. Structural provinces of the Wyoming province 2.55 Ga. deformation no deformation since 2.83 Ga. 2.67 Ga. orogenic belt 2.66 - 2.63 Ga. accretion Proterozoic accretion

  3. High-pressure granulites (Moose Basin gneiss) are preserved as a enclave in the northernmost Teton Range.

  4. Structural Relations in the Moose Basin gneiss Metapelitic schist Q-Plag-Bio-Ky-Gar f2 f2 f1 foliated garnet amphibolite Mafic garnet granulite Isotropic amphibolite

  5. Garnet-bearing leucosome in partially melted mafic granulite

  6. Kyanite and garnet in pelitic gneiss

  7. Ky Cord Sil St Decompression textures in pelitic schist

  8. P-T conditions for the Moose Basin gneiss GRAIL

  9. Metamorphic History

  10. Sketch showing the Structural Relations between the Moose basin and Webb Canyon gneisses

  11. Summary of structural events

  12. Structural provinces of the Wyoming province 2.55 Ga. deformation no deformation since 2.83 Ga. 2.67 Ga. orogenic belt 2.66 - 2.63 Ga. accretion Proterozoic accretion

  13. Schematic cross section across the western Wyoming province at 2.67 -2.68 Ga

  14. Age and pressure of some Precambrian HP granulite terranes Typical P for Archean metamorphism

  15. Conclusions • Continental collisions clearly were occurring by 2.67 Ga. • Continental collisions may have been operating before 2.67 Ga, but either have not been recognized or completely recrystallized to lower pressure conditions

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