Subduction Factory: Its Role in the Evolution of the Solid Earth Y.Tatsumi (IFREE, JAMSTEC) ・...
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Transcript of Subduction Factory: Its Role in the Evolution of the Solid Earth Y.Tatsumi (IFREE, JAMSTEC) ・...
Subduction Factory:Subduction Factory:Its Role in the Evolution of the Solid EarthIts Role in the Evolution of the Solid Earth
Y.Tatsumi (IFREE, JAMSTEC)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
Institute for Frontier Research on Earth EvolutionInstitute for Frontier Research on Earth Evolution
Yoshiyuki TatsumiYoshiyuki Tatsumi
The Subduction FactoryThe Subduction Factory
Raw materials■Oceanic material■Mantle material
Products■Magma/Volcanoes■Volatiles■Continental crust
Residues■Chemically modified slab■Delaminated lower crust
Institute for Frontier Research on Earth EvolutionInstitute for Frontier Research on Earth Evolution
Yoshiyuki TatsumiYoshiyuki Tatsumi
General CharacteristicsGeneral Characteristicsof Arc Magmatismof 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
Institute for Frontier Research on Earth EvolutionInstitute for Frontier Research on Earth Evolution
Yoshiyuki TatsumiYoshiyuki Tatsumi
Volcano Distribution Volcano Distribution in NE Japan Arcin NE Japan Arc
Institute for Frontier Research on Earth EvolutionInstitute for Frontier Research on Earth Evolution
Yoshiyuki TatsumiYoshiyuki Tatsumi
Distance from Volcanic FrontDistance from Volcanic Front vs.vs. Number of Volcanoes Number of Volcanoes
Institute for Frontier Research on Earth EvolutionInstitute for Frontier Research on Earth Evolution
Yoshiyuki TatsumiYoshiyuki Tatsumi
General Characteristics General Characteristics of Arc Magmatismof 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
Institute for Frontier Research on Earth EvolutionInstitute for Frontier Research on Earth Evolution
Yoshiyuki TatsumiYoshiyuki Tatsumi
Subduction Angle Subduction Angle vs.vs. Arc Width Arc Width
Institute for Frontier Research on Earth EvolutionInstitute for Frontier Research on Earth Evolution
Yoshiyuki TatsumiYoshiyuki Tatsumi
Constant Depth to Slab SurfaceConstant Depth to Slab Surface
Institute for Frontier Research on Earth EvolutionInstitute for Frontier Research on Earth Evolution
Yoshiyuki TatsumiYoshiyuki Tatsumi
Hydrous Phases Stability:Hydrous Phases Stability:BasaltBasalt
Institute for Frontier Research on Earth EvolutionInstitute for Frontier Research on Earth Evolution
Yoshiyuki TatsumiYoshiyuki Tatsumi
Migration of FluidsMigration of Fluids
Institute for Frontier Research on Earth EvolutionInstitute for Frontier Research on Earth Evolution
Yoshiyuki TatsumiYoshiyuki Tatsumi
Hydrous Phases Stability:Hydrous Phases Stability:PeridotitePeridotite
Institute for Frontier Research on Earth EvolutionInstitute for Frontier Research on Earth Evolution
Yoshiyuki TatsumiYoshiyuki Tatsumi
Formation of Hydrous CurtainsFormation of Hydrous Curtains
Institute for Frontier Research on Earth EvolutionInstitute for Frontier Research on Earth Evolution
Yoshiyuki TatsumiYoshiyuki Tatsumi
・ Dual volcanic chains
・ Inverse correlation between arc width and subduction angle
・ High-T mantle wedge and hot fingers
・ Selective enrichment of LIL elements
General Characteristics General Characteristics of Arc Magmatismof Arc Magmatism
Institute for Frontier Research on Earth EvolutionInstitute for Frontier Research on Earth Evolution
Yoshiyuki TatsumiYoshiyuki Tatsumi
Generation of Arc Basalt MagmasGeneration of Arc Basalt Magmas
Tatsumi et al. (1983)
Institute for Frontier Research on Earth EvolutionInstitute for Frontier Research on Earth Evolution
Yoshiyuki TatsumiYoshiyuki Tatsumi
Seismic Tomography ImageSeismic Tomography Imagebeneath NE Japanbeneath NE Japan
Zhao et al. (1992)
Institute for Frontier Research on Earth EvolutionInstitute for Frontier Research on Earth Evolution
Yoshiyuki TatsumiYoshiyuki Tatsumi
Numerical Simulation ExperimentsNumerical Simulation Experiments
Furukawa (1993)
Institute for Frontier Research on Earth EvolutionInstitute for Frontier Research on Earth Evolution
Yoshiyuki TatsumiYoshiyuki Tatsumi
Heterogeneous Volcano DistributionHeterogeneous Volcano Distributionin NE Japan Arcin NE Japan Arc
Institute for Frontier Research on Earth EvolutionInstitute for Frontier Research on Earth Evolution
Yoshiyuki TatsumiYoshiyuki Tatsumi
Heterogeneous Distribution Heterogeneous Distribution of High-T Mantle Wedgeof High-T Mantle Wedge
Institute for Frontier Research on Earth EvolutionInstitute for Frontier Research on Earth Evolution
Yoshiyuki TatsumiYoshiyuki Tatsumi
Heterogeneous DistributionHeterogeneous Distributionof High-T Mantle Wedgeof High-T Mantle Wedge
Institute for Frontier Research on Earth EvolutionInstitute for Frontier Research on Earth Evolution
Yoshiyuki TatsumiYoshiyuki Tatsumi
Hot Fingers in the Mantle WedgeHot Fingers in the Mantle Wedge
Institute for Frontier Research on Earth EvolutionInstitute for Frontier Research on Earth Evolution
Yoshiyuki TatsumiYoshiyuki Tatsumi
General CharacteristicsGeneral Characteristicsof Arc Magmatismof 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
Institute for Frontier Research on Earth EvolutionInstitute for Frontier Research on Earth Evolution
Yoshiyuki TatsumiYoshiyuki Tatsumi
Trace Element CharacteristicsTrace Element Characteristics
Subduction zone basalt
Institute for Frontier Research on Earth EvolutionInstitute for Frontier Research on Earth Evolution
Yoshiyuki TatsumiYoshiyuki Tatsumi
Starting MaterialsStarting Materials■Plate-forming hydrous materials such as sediments/amphibolites■Being set in a perforated platinum capsule
High-P/T Dehydration ExperimentsHigh-P/T Dehydration Experiments■Decomposition of starting materials■Releasing H2O that dissolves elements■Leaving anhydrous residue■Chemistry: starting materials vs. residue
Element Transport during DehydrationElement Transport during Dehydration
Institute for Frontier Research on Earth EvolutionInstitute for Frontier Research on Earth Evolution
Yoshiyuki TatsumiYoshiyuki Tatsumi
Element Transport Element Transport via.via. Dehydration Dehydration
Institute for Frontier Research on Earth EvolutionInstitute for Frontier Research on Earth Evolution
Yoshiyuki TatsumiYoshiyuki Tatsumi
Inferred Arc Magma CompositionsInferred Arc Magma Compositions
Institute for Frontier Research on Earth EvolutionInstitute for Frontier Research on Earth Evolution
Yoshiyuki TatsumiYoshiyuki Tatsumi
Origin of Andesites and Origin of Andesites and Continental CrustsContinental Crusts
・ Calc-alkalic vs. tholeitic andeistes
・ Bulk continental crust: andesitic, not basaltic compositions
Institute for Frontier Research on Earth EvolutionInstitute for Frontier Research on Earth Evolution
Yoshiyuki TatsumiYoshiyuki Tatsumi
Arc Magmas Arc Magmas vs.vs. Continental CrustContinental Crust
THCA
Institute for Frontier Research on Earth EvolutionInstitute for Frontier Research on Earth Evolution
Yoshiyuki TatsumiYoshiyuki Tatsumi
Characteristics of Calc-Alkalic AndesitesCharacteristics 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
A Plausible Mechanism:--mixing of basaltic and felsic magmas
Origin of End-member Magmas •Basalt magma:mantle-derived•Felsic magma:external or internal origin?
Institute for Frontier Research on Earth EvolutionInstitute for Frontier Research on Earth Evolution
Yoshiyuki TatsumiYoshiyuki Tatsumi
Crustal Origin for Felsic MagmasCrustal Origin for Felsic Magmas
Institute for Frontier Research on Earth EvolutionInstitute for Frontier Research on Earth Evolution
Yoshiyuki TatsumiYoshiyuki Tatsumi
Ancient Ancient MORBMORB
Ridge Ridge AlterationAlteration
ElementElementTransportTransport
Slub Slub FluidFluid
Ancient Altered Ancient Altered MORBMORB
Ancient Magma SourceAncient Magma Source
AncientAncientOriginal Mantle WedgeOriginal Mantle Wedge(Primitive Mantle)(Primitive Mantle)
ancient Primary Basaltancient Primary BasaltInitial Arc CrustInitial Arc Crust
Remolten Felsic Remolten Felsic Magma Magma
ContinentContinental crustal crust
Mix
ing
Mix
ing
Andesitic Continental Crust FormationAndesitic Continental Crust Formation
Primary BasaltPrimary Basalt
Magma SourceMagma SourceOriginal Original Mantle WedgeMantle Wedge(N-MORB Source)(N-MORB Source)
ElementElementTransportTransport
Slub Slub FluidFluid
Altered MORBAltered MORB Fresh MORBFresh MORB
Ridge AlterationRidge Alteration
Institute for Frontier Research on Earth EvolutionInstitute for Frontier Research on Earth Evolution
Yoshiyuki TatsumiYoshiyuki Tatsumi
Inferred AndesitesInferred Andesitesproduced by Magma mixingproduced by Magma mixing
Institute for Frontier Research on Earth EvolutionInstitute for Frontier Research on Earth Evolution
Yoshiyuki TatsumiYoshiyuki Tatsumi
Delamination
Andesite
Restite
Bas
alti
c C
om
p.
DelaminationDelamination
Initial Arc Crust
Dacite
Restite
Anatexis/Mixing
Basalt
Mix
ing
Mix
ing
Delamination Process Delamination Process RequiredRequired
Institute for Frontier Research on Earth EvolutionInstitute for Frontier Research on Earth Evolution
Yoshiyuki TatsumiYoshiyuki Tatsumi
Fate of Waste MaterialsFate of Waste Materials
・ Oceanic crust (dehydrated and fresh)
・ Sediments
・ Delaminated anti-continental crust
Institute for Frontier Research on Earth EvolutionInstitute for Frontier Research on Earth Evolution
Yoshiyuki TatsumiYoshiyuki Tatsumi
Isotopic characteristicsIsotopic characteristicsof Oceanic Magmasof Oceanic Magmas
Institute for Frontier Research on Earth EvolutionInstitute for Frontier Research on Earth Evolution
Yoshiyuki TatsumiYoshiyuki Tatsumi
Chemical ModificationChemical Modificationof Altered Oceanic Crustof Altered Oceanic Crust
Element Transport via. Dehydration
Institute for Frontier Research on Earth EvolutionInstitute for Frontier Research on Earth Evolution
Yoshiyuki TatsumiYoshiyuki Tatsumi
Isotopic Evolution of Sinking CrustsIsotopic Evolution of Sinking Crusts
Institute for Frontier Research on Earth EvolutionInstitute for Frontier Research on Earth Evolution
Yoshiyuki TatsumiYoshiyuki Tatsumi
Chemical ModificationChemical Modificationof Subducting Sedimentsof Subducting Sediments
Element Transport via. Dehydration
Institute for Frontier Research on Earth EvolutionInstitute for Frontier Research on Earth Evolution
Yoshiyuki TatsumiYoshiyuki Tatsumi
Isotopic Evolution of Sinking SedimentsIsotopic Evolution of Sinking Sediments
Institute for Frontier Research on Earth EvolutionInstitute for Frontier Research on Earth Evolution
Yoshiyuki TatsumiYoshiyuki Tatsumi
Isotopic EvolutionIsotopic Evolutionof Delaminated Arc Crustof Delaminated Arc Crust
Institute for Frontier Research on Earth EvolutionInstitute for Frontier Research on Earth Evolution
Yoshiyuki TatsumiYoshiyuki Tatsumi
Material Recycling in the Earth Interior
Institute for Frontier Research on Earth EvolutionInstitute for Frontier Research on Earth Evolution
Yoshiyuki TatsumiYoshiyuki Tatsumi
The Subduction FactoryThe Subduction Factory
Raw materials■Oceanic material■Mantle material
Products■Volcanoes■Volatiles■Continental crust
Residues■Chemically modified slab■Delaminated lower crust