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PALYNOLOGY Environmental Sequence Global Climate Change Tectonism Sierran Rain Shadow Local Uplift/Subsidence

HISTORY OF THE SNAKE RIVER PLAIN HOTSPOT. PALYNOLOGY Environmental Sequence Global Climate Change Tectonism Sierran Rain Shadow Local Uplift/Subsidence. VOLCANOLOGY SRP History Plume – Crust Interactions Hotspot Dynamics. HISTORY OF THE SNAKE RIVER PLAIN HOTSPOT. PALYNOLOGY

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PALYNOLOGY Environmental Sequence Global Climate Change Tectonism Sierran Rain Shadow Local Uplift/Subsidence

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  1. HISTORY OF THE SNAKE RIVER PLAIN HOTSPOT • PALYNOLOGY • Environmental Sequence • Global Climate Change • Tectonism • Sierran Rain Shadow • Local Uplift/Subsidence • VOLCANOLOGY • SRP History • Plume – Crust Interactions • Hotspot Dynamics

  2. HISTORY OF THE SNAKE RIVER PLAIN HOTSPOT • PALYNOLOGY • Environmental Sequence • Global Climate Change • Tectonism • Sierran Rain Shadow • Local Uplift/Subsidence Dated Tephra Dated Flows Uplift/Subsidence • VOLCANOLOGY • SRP History • Plume – Crust Interactions • Hotspot Dynamics

  3. HISTORY OF THE SNAKE RIVER PLAIN HOTSPOT • PALYNOLOGY • Environmental Sequence • Global Climate Change • Tectonism • Sierran Rain Shadow • Local Uplift/Subsidence Dated Tephra Dated Flows Uplift/Subsidence Paleoelevation Interbed Ages Correlation • VOLCANOLOGY • SRP History • Plume – Crust Interactions • Hotspot Dynamics

  4. Strong influence of elevation on vegetation & palynology

  5. Climatic changes (glacial/interglacial) subtle

  6. Marked late-Neogene evolution of vegetation Climate = global + tectonic 4200 ft

  7. Trends: late Miocene – early Pleistocene (means of dating and correlating flows) 0.7 m.a. 5 m.a. 10 m.a.

  8. Composite of Bruneau and MHAB-1 cores 4000 ft

  9. Tentative Chronology (based on correlation) Pleisto Pliocene Terteling Spr 5-6 m.a. Mio Dated Lava

  10. Volcanic Tephra Chronology for palynology, Before Lake Idaho ~8 Ma ~11 Ma

  11. Interbedded Sediments: east of Lake Idaho younger than Lake Idaho 4 Ma 6.25 Ma

  12. Interbedded Sediments: cores & wells • INEL (thanks to Linda Davis) • Deerflat, Simplot, etc. 1.12 & 3.16 km 8.2 Ma

  13. Tentative Sequence

  14. Preliminary Palynological Results • Tentative vegetation-climate sequence • Potential value of long cores • Apparent ages consistent with HOTSPOT • Paleoelevation: large changes • INEL-1 ~km • Interbedded sediments provide: • Wider coverage (not just Lake Idaho) • Tephra & flow dates for Palynology sequence

  15. Horseshoe Bend

  16. Additional INEL, Hagerman Fossil Beds and Simplot Well samples

  17. Age: Nothing in “Lk Idaho” older than mid-Miocene?Elevation: big changes & high elev. flora very different

  18. Sand Spr. 0.095 Ma

  19. Snake River Plain Cross-section Homedale - Boise

  20. Surface elevation of Lake Idaho sensu lato Bruneau Fm.

  21. Miocene Riparian Vegetation

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