1. Subduction Factory: Its Role in the Evolution of the Solid Earth Y
Subduction Factory: Its Role in the Evolution of the Solid Earth Y.Tatsumi (IFREE, JAMSTEC)
・Outline of subduction factory
・General characteristics of magmatism and basalt genesis
・Andesite genesis and continental crust formation
・Fate of waste materials and mantle evolution

2. The Subduction Factory
Raw materials
Oceanic material
Mantle material
Products
Magma/Volcanoes
Volatiles
Continental crust
Residues
Chemically modified slab
Delaminated lower crust

3. General Characteristics of Arc Magmatism
・Dual volcanic chains
・Inverse correlation between arc width and subduction angle
・High-T mantle wedge and hot fingers
・Selective enrichment of LIL elements

4. Volcano Distribution in NE Japan Arc

5. Distance from Volcanic Front vs. Number of Volcanoes

6. General Characteristics of Arc Magmatism
・Inverse correlation between arc width and subduction angle
・Dual volcanic chains
・High-T mantle wedge and hot fingers
・Selective enrichment of LIL elements

7. Subduction Angle vs. Arc Width

8. Constant Depth to Slab Surface
タイトルお願いします。

9. Hydrous Phases Stability: Basalt

10. Migration of Fluids
タイトルお願いします

11. Hydrous Phases Stability: Peridotite

12. Formation of Hydrous Curtains

13. General Characteristics of Arc Magmatism
・Dual volcanic chains
・Inverse correlation between arc width and subduction angle
・High-T mantle wedge and hot fingers
・Selective enrichment of LIL elements

14. Generation of Arc Basalt Magmas
Tatsumi et al. (1983)

15. Seismic Tomography Image beneath NE Japan
Zhao et al. (1992)
タイトルお願いします

16. Numerical Simulation Experiments
Furukawa (1993)
タイトルお願いします

17. Heterogeneous Volcano Distribution in NE Japan Arc

18. Heterogeneous Distribution of High-T Mantle Wedge
タイトルお願いします

19. Heterogeneous Distribution of High-T Mantle Wedge
タイトルお願いします

20. Hot Fingers in the Mantle Wedge
タイトルお願いします

21. General Characteristics of Arc Magmatism
・Dual volcanic chains
・Inverse correlation between arc width and subduction angle
・High-T mantle wedge and hot fingers
・Selective enrichment of LIL elements

22. Trace Element Characteristics
Subduction zone basalt
配置、順序等はてきとうですのでご指示お願いします。

23. Element Transport during Dehydration
Starting Materials
Plate-forming hydrous materials such as
sediments/amphibolites
Being set in a perforated platinum capsule
High-P/T Dehydration Experiments
Decomposition of starting materials
Releasing H2O that dissolves elements
Leaving anhydrous residue
Chemistry: starting materials vs. residue
配置、順序等はてきとうですのでご指示お願いします。

24. Element Transport via. Dehydration

25. Inferred Arc Magma Compositions

26. Origin of Andesites and Continental Crusts
・Calc-alkalic vs. tholeitic andeistes
・Bulk continental crust:
　andesitic, not basaltic compositions

27. Arc Magmas vs. Continental CrustTH CA
黄色の部分が最前面なら問題ないのですが、背面におくるため画像の処理をしていますのでちょっと図が粗くなってしまいます。

28. Characteristics of Calc-Alkalic Andesites
Rather straight differentiation trend
Disequilibrium phenocryst assemblages (e.g., ol+qz)
Presence of reversely-zoned phenocryst
Bimodal distribution of phenocryst-core compositions
Origin of End-member Magmas
Basalt magma:mantle-derived
Felsic magma:external or internal origin?
A Plausible Mechanism:
--mixing of basaltic and felsic magmas

29. Crustal Origin for Felsic Magmas

30. Andesitic Continental Crust Formation
Ancient MORB
Ridge Alteration
Element
Transport
Slub Fluid
Ancient Altered MORB
Ancient Magma Source
Ancient
Original Mantle Wedge
(Primitive Mantle)
ancient Primary Basalt
Initial Arc Crust
Remolten Felsic Magma
Continental crust
Mixing
Primary Basalt
Magma Source
Original
Mantle Wedge
(N-MORB Source)
Element
Transport
Slub Fluid
Altered MORB
Fresh MORB
Ridge Alteration

31. Inferred Andesites produced by Magma mixing

32. Delamination Process Required
Initial Arc Crust
Dacite
Restite
Anatexis/Mixing
Basalt
Mixing
Delamination
Andesite
Restite
Basaltic Comp.

33. Fate of Waste Materials
・Oceanic crust (dehydrated and fresh)
・Sediments
・Delaminated anti-continental crust

34. Isotopic characteristics of Oceanic Magmas

35. Chemical Modification of Altered Oceanic Crust
Element Transport via. Dehydration

36. Isotopic Evolution of Sinking Crusts

37. Chemical Modification of Subducting Sediments
Element Transport via. Dehydration

38. Isotopic Evolution of Sinking Sediments

39. Isotopic Evolution of Delaminated Arc Crust

40. Material Recycling in the Earth Interior

41. The Subduction Factory
Raw materials
Oceanic material
Mantle material
Products
Volcanoes
Volatiles
Continental crust
Residues
Chemically modified slab
Delaminated lower crust

42. I F R E E
Institute for Frontier Research on Earth Evolution