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Geochemistry of Dominant Low-Ti Basalts of the Siberian Traps and

Geochemistry of Dominant Low-Ti Basalts of the Siberian Traps and Subduction-Related Model of Their Origin. Ivanov A.V. Institute of the Earth’s Crust, Siberian Branch, Russian Academy of Sciences. Flood basalt geochemistry 1.1. Columbia River & 1.2. Siberian Traps.

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Geochemistry of Dominant Low-Ti Basalts of the Siberian Traps and

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  1. Geochemistry of Dominant Low-Ti Basalts of the Siberian Traps and Subduction-Related Model of Their Origin Ivanov A.V. Institute of the Earth’s Crust, Siberian Branch, Russian Academy of Sciences • Flood basalt geochemistry • 1.1. Columbia River & 1.2. Siberian Traps 2. Subduction-related model for flood basalts (Siberian Traps)

  2. Columbia river Os-isotope data are after Chesley and Ruiz (1998)

  3. Columbia river Data are plotted after Hooper and Hawkesworth (1993)

  4. Columbia river Data are plotted after Hooper and Hawkesworth (1993)

  5. Columbia river

  6. Columbia river High-Mg basalts of Klyuchevskoi volcano

  7. Siberian Traps Pangea

  8. Siberian Traps Ages are for ‘basalts’ only !

  9. Siberian Traps Approximate size of the Columbia River flood basalts

  10. Siberian Traps Noril’sk

  11. Siberian Traps Upper Morongovsky subsuite to Samoedsky suite basalts are not contaminated Saddle Mountains Imnaha Data are plotted after Wooden et al. (1993)

  12. Siberian Traps Data are plotted after Wooden et al. (1993)

  13. Siberian Traps

  14. Siberian Traps

  15. Siberian Traps Subduction signatures are more prominent

  16. Model After Ohtani (2005)

  17. Model Based on Bina et al. (2001), Litasov and Ohtani (2003), Hirschmann et al. (2005)

  18. Siberian Traps 2300 km Transbaikalian belt (Andean-type orogen)

  19. Model Transbaikalian belt

  20. Model Siberian Traps, Noril’sk event

  21. Model Siberian Traps, Tunguska event

  22. Conclusions 1. Primitive mantle-derived flood basalts (with Siberian Traps and Columbia River as examples) show similarities with typical island-arc basalts. They are remarkably different with ocean island basalts. 2. Flood basalt origin can be explained by water-recycling through transition zone of mantle via stagnated (by depth) subduction.

  23. Thanks!

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