petrology chapter 10
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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. - PowerPoint PPT PresentationTRANSCRIPT
![Page 1: Petrology Chapter 10](https://reader035.vdocuments.us/reader035/viewer/2022062222/568163cc550346895dd50bc0/html5/thumbnails/1.jpg)
Petrology Chapter 10Gautam Sen
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Global Subduction
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Dips of Subducting Plates
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Slab behavior
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Nature of Subduction Zone
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Chilean & Mariana Type Subduction Zones
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Arc rock classification: Andean Volcanoes
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Adakites: A Special Type
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Trace element characteristics
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Trace elements: Fluid-friendly elements
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Nd-Sr Isotope Composition
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Pb Isotope Composition
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IBM Arc
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Evolution of IBM Arc
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Andes: Spatial Zonation
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Cross-section of C. Andean Arc
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K2O – SiO2 in Andean Volcanoes
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Magma Formation, Processing, Emplacement, and Eruption
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Andes: Southern Volcanic Zone
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K2O – Gravity relationship
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Latitude vs. Sr-isotope ratio
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C.R. Stern’s alternative explanation: Importance of subduction erosion
NSVZ – Northern section of Southern Volcanic ZoneSSVZ – Southern section of Southern Volcanic ZoneNSVZM – NSVZ MagmaSSVZM – SSVZ MagmaAFC – Assimilation-Fractional Crystallization
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Cascades Volcanic Chain
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Cascades Volcanism with Slab Migration
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K2O-SiO2 Relationship
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Leeman’s Diagrams
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Melt Inclusions & the Daly Gap(Reubi & Blundy)
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Grove’s Explanation of the Daly Gap: A natural consequence of basalt magma crystallization
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Daly Gap: Bimodal Volcanism
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Dehydration of Slabs
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Hydrated “Wedge” Solidus
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Calc-alkaline vs. Tholeiitic Trends: Grove’s summary diagram
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Granitoids & granitoids (Frost Classes)
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Granite Production Environments
a: Island arcb: Continental arcc: Contiental collisiond: Continental extension
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Sierra Nevada, USA
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Himalayan Batholiths
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Toulumne Granite complex
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Granite Production in Sierra Nevada Batholith (SNB)
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P-T of Sierran Xenoliths (Ducea, Saleeby)
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Deep Structure of SNB (Saleeby)
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Isotopes of Xenoliths and SNB
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Lithosphere delamination in SNB
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Ash distribution from Bishop Tuff eruption
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Long Valley Caldera
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Long Valley Caldera (LVC) Products
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LVC Products (Cont’d)
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LVC Magma Chamber
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Q-Ab-Or System
P= 1 atm P= PH2O = 0.5 GPa
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Granitoids worldwide and the Granite “system”
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Granitoid magma generation by melting