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№1 слайд![Базальты](/documents_6/77c636b88d3428682f03a1b867b02489/img0.jpg)
Содержание слайда: Базальты
№2 слайд![](/documents_6/77c636b88d3428682f03a1b867b02489/img1.jpg)
№3 слайд![](/documents_6/77c636b88d3428682f03a1b867b02489/img2.jpg)
№4 слайд![](/documents_6/77c636b88d3428682f03a1b867b02489/img3.jpg)
№5 слайд![](/documents_6/77c636b88d3428682f03a1b867b02489/img4.jpg)
№6 слайд![](/documents_6/77c636b88d3428682f03a1b867b02489/img5.jpg)
№7 слайд![](/documents_6/77c636b88d3428682f03a1b867b02489/img6.jpg)
№8 слайд![](/documents_6/77c636b88d3428682f03a1b867b02489/img7.jpg)
№9 слайд![](/documents_6/77c636b88d3428682f03a1b867b02489/img8.jpg)
№10 слайд![](/documents_6/77c636b88d3428682f03a1b867b02489/img9.jpg)
№11 слайд![](/documents_6/77c636b88d3428682f03a1b867b02489/img10.jpg)
№12 слайд![](/documents_6/77c636b88d3428682f03a1b867b02489/img11.jpg)
№13 слайд![](/documents_6/77c636b88d3428682f03a1b867b02489/img12.jpg)
№14 слайд![](/documents_6/77c636b88d3428682f03a1b867b02489/img13.jpg)
№15 слайд![](/documents_6/77c636b88d3428682f03a1b867b02489/img14.jpg)
№16 слайд![](/documents_6/77c636b88d3428682f03a1b867b02489/img15.jpg)
№17 слайд![](/documents_6/77c636b88d3428682f03a1b867b02489/img16.jpg)
№18 слайд![](/documents_6/77c636b88d3428682f03a1b867b02489/img17.jpg)
№19 слайд![](/documents_6/77c636b88d3428682f03a1b867b02489/img18.jpg)
№20 слайд![Chapter Mid-Ocean Rifts The](/documents_6/77c636b88d3428682f03a1b867b02489/img19.jpg)
Содержание слайда: Chapter 13: Mid-Ocean Rifts
The Mid-Ocean Ridge System
№21 слайд![Oceanic Crust and Upper](/documents_6/77c636b88d3428682f03a1b867b02489/img20.jpg)
Содержание слайда: Oceanic Crust and Upper Mantle Structure
Typical Ophiolite
№22 слайд![The major element chemistry](/documents_6/77c636b88d3428682f03a1b867b02489/img21.jpg)
Содержание слайда: The major element chemistry of MORBs
The major element chemistry of MORBs
№23 слайд![MgO and FeO MgO and FeO Al O](/documents_6/77c636b88d3428682f03a1b867b02489/img22.jpg)
Содержание слайда: MgO and FeO
MgO and FeO
Al2O3 and CaO
SiO2
Na2O, K2O, TiO2, P2O5
№24 слайд![Trace Element and Isotope](/documents_6/77c636b88d3428682f03a1b867b02489/img23.jpg)
Содержание слайда: Trace Element and Isotope Chemistry
REE diagram for MORBs
№25 слайд![N-MORBs Sr Sr lt . and Nd Nd](/documents_6/77c636b88d3428682f03a1b867b02489/img24.jpg)
Содержание слайда: N-MORBs: 87Sr/86Sr < 0.7035 and 143Nd/144Nd > 0.5030, depleted mantle source
N-MORBs: 87Sr/86Sr < 0.7035 and 143Nd/144Nd > 0.5030, depleted mantle source
E-MORBs extend to more enriched values stronger support distinct mantle reservoirs for N-type and E-type MORBs
№26 слайд![MORB Petrogenesis Separation](/documents_6/77c636b88d3428682f03a1b867b02489/img25.jpg)
Содержание слайда: MORB Petrogenesis
Separation of the plates
Upward motion of mantle material into extended zone
Decompression partial melting associated with near-adiabatic rise
N-MORB melting initiated ~ 60-80 km depth in upper depleted mantle where it inherits depleted trace element and isotopic char.
№27 слайд![](/documents_6/77c636b88d3428682f03a1b867b02489/img26.jpg)
№28 слайд![](/documents_6/77c636b88d3428682f03a1b867b02489/img27.jpg)
№29 слайд![Ocean-ocean Island Arc IA](/documents_6/77c636b88d3428682f03a1b867b02489/img28.jpg)
Содержание слайда: Ocean-ocean Island Arc (IA)
Ocean-ocean Island Arc (IA)
Ocean-continent Continental Arc or
Active Continental Margin (ACM)
№30 слайд![Chapter Continental Arc](/documents_6/77c636b88d3428682f03a1b867b02489/img29.jpg)
Содержание слайда: Chapter 17: Continental Arc Magmatism
№31 слайд![Structure of an Island Arc](/documents_6/77c636b88d3428682f03a1b867b02489/img30.jpg)
Содержание слайда: Structure of an Island Arc
№32 слайд![](/documents_6/77c636b88d3428682f03a1b867b02489/img31.jpg)
№33 слайд![](/documents_6/77c636b88d3428682f03a1b867b02489/img32.jpg)
№34 слайд![Tholeiitic vs. Calc-alkaline](/documents_6/77c636b88d3428682f03a1b867b02489/img33.jpg)
Содержание слайда: Tholeiitic vs. Calc-alkaline differentiation
№35 слайд![Calc-alkaline differentiation](/documents_6/77c636b88d3428682f03a1b867b02489/img34.jpg)
Содержание слайда: Calc-alkaline differentiation
Early crystallization of an Fe-Ti oxide phase
Probably related to the high water content of calc-alkaline magmas in arcs, dissolves high fO2
High water pressure also depresses the plagioclase liquidus and more An-rich
As hydrous magma rises, P plagioclase liquidus moves to higher T crystallization of considerable An-rich-SiO2-poor plagioclase
The crystallization of anorthitic plagioclase and low-silica, high-Fe hornblende is an alternative mechanism for the observed calc-alkaline differentiation trend
№36 слайд![Trace Elements REEs Slope](/documents_6/77c636b88d3428682f03a1b867b02489/img35.jpg)
Содержание слайда: Trace Elements
REEs
Slope within series is similar, but height varies with FX due to removal of Ol, Plag, and Pyx
(+) slope of low-K DM
Some even more depleted than MORB
Others have more normal slopes
Thus heterogeneous mantle sources
HREE flat, so no deep garnet
№37 слайд![MORB-normalized Spider](/documents_6/77c636b88d3428682f03a1b867b02489/img36.jpg)
Содержание слайда: MORB-normalized Spider diagrams
MORB-normalized Spider diagrams
IA: decoupled HFS - LIL (LIL are hydrophilic)
№38 слайд![](/documents_6/77c636b88d3428682f03a1b867b02489/img37.jpg)
№39 слайд![](/documents_6/77c636b88d3428682f03a1b867b02489/img38.jpg)
№40 слайд![](/documents_6/77c636b88d3428682f03a1b867b02489/img39.jpg)
№41 слайд![](/documents_6/77c636b88d3428682f03a1b867b02489/img40.jpg)