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Petrology Chapter 10

Petrology Chapter 10. Gautam Sen. Global Subduction. Dips of Subducting Plates. Slab behavior. Nature of Subduction Zone. Chilean & Mariana Type Subduction Zones. Arc rock classification: Andean Volcanoes. Adakites : A Special Type. Trace element characteristics.

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Petrology Chapter 10

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  1. Petrology Chapter 10 Gautam Sen

  2. Global Subduction

  3. Dips of Subducting Plates

  4. Slab behavior

  5. Nature of Subduction Zone

  6. Chilean & Mariana Type Subduction Zones

  7. Arc rock classification: Andean Volcanoes

  8. Adakites: A Special Type

  9. Trace element characteristics

  10. Trace elements: Fluid-friendly elements

  11. Nd-Sr Isotope Composition

  12. Pb Isotope Composition

  13. IBM Arc

  14. Evolution of IBM Arc

  15. Andes: Spatial Zonation

  16. Cross-section of C. Andean Arc

  17. K2O – SiO2 in Andean Volcanoes

  18. Magma Formation, Processing, Emplacement, and Eruption

  19. Andes: Southern Volcanic Zone

  20. K2O – Gravity relationship

  21. Latitude vs. Sr-isotope ratio

  22. C.R. Stern’s alternative explanation: Importance of subduction erosion NSVZ – Northern section of Southern Volcanic Zone SSVZ – Southern section of Southern Volcanic Zone NSVZM – NSVZ Magma SSVZM – SSVZ Magma AFC – Assimilation-Fractional Crystallization

  23. Cascades Volcanic Chain

  24. Cascades Volcanism with Slab Migration

  25. K2O-SiO2 Relationship

  26. Leeman’s Diagrams

  27. Melt Inclusions & the Daly Gap(Reubi & Blundy)

  28. Grove’s Explanation of the Daly Gap: A natural consequence of basalt magma crystallization

  29. Daly Gap: Bimodal Volcanism

  30. Dehydration of Slabs

  31. Hydrated “Wedge” Solidus

  32. Calc-alkaline vs. Tholeiitic Trends: Grove’s summary diagram

  33. Granitoids & granitoids (Frost Classes)

  34. Granite Production Environments a: Island arc b: Continental arc c: Contiental collision d: Continental extension

  35. Sierra Nevada, USA

  36. Himalayan Batholiths

  37. Toulumne Granite complex

  38. Granite Production in Sierra Nevada Batholith (SNB)

  39. P-T of Sierran Xenoliths (Ducea, Saleeby)

  40. Deep Structure of SNB (Saleeby)

  41. Isotopes of Xenoliths and SNB

  42. Lithosphere delamination in SNB

  43. Ash distribution from Bishop Tuff eruption

  44. Long Valley Caldera

  45. Long Valley Caldera (LVC) Products

  46. LVC Products (Cont’d)

  47. LVC Magma Chamber

  48. Q-Ab-Or System P= 1 atm P= PH2O = 0.5 GPa

  49. Granitoids worldwide and the Granite “system”

  50. Granitoid magma generation by melting

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