van keken, 2003
DESCRIPTION
Mantle wedge processes. Limits of SZ. ‘cold nose’. Van Keken, 2003. Basaltic crust. 7 km. Harzburgitic mantle. 45 km. Peridotitic mantle. Compositional stratification. Van Keken, EPSL, 2003. Tpot=200-250 K higher. Abbott et al., JGR, 1994. - PowerPoint PPT PresentationTRANSCRIPT
![Page 1: Van Keken, 2003](https://reader033.vdocuments.mx/reader033/viewer/2022051418/56815805550346895dc57580/html5/thumbnails/1.jpg)
Van Keken, 2003
‘cold nose’
Limits of SZ
Mantle wedge processes
![Page 2: Van Keken, 2003](https://reader033.vdocuments.mx/reader033/viewer/2022051418/56815805550346895dc57580/html5/thumbnails/2.jpg)
Van Keken, EPSL, 2003
Basaltic crust
Harzburgitic mantle
Peridotitic mantle
45 km
7 km
Compositional stratification
![Page 3: Van Keken, 2003](https://reader033.vdocuments.mx/reader033/viewer/2022051418/56815805550346895dc57580/html5/thumbnails/3.jpg)
Abbott et al., JGR, 1994Tpot=200-250 K higher
![Page 4: Van Keken, 2003](https://reader033.vdocuments.mx/reader033/viewer/2022051418/56815805550346895dc57580/html5/thumbnails/4.jpg)
Compositional stabilization of oceanic lithosphere
Vlaar et al., EPSL, 1994
![Page 5: Van Keken, 2003](https://reader033.vdocuments.mx/reader033/viewer/2022051418/56815805550346895dc57580/html5/thumbnails/5.jpg)
Vlaar et al., EPSL, 1994
Pre-plate tectonic cooling mechanism (?)
Sufficient to cool to near-present dayTpot within 1 Byr
![Page 6: Van Keken, 2003](https://reader033.vdocuments.mx/reader033/viewer/2022051418/56815805550346895dc57580/html5/thumbnails/6.jpg)
![Page 7: Van Keken, 2003](https://reader033.vdocuments.mx/reader033/viewer/2022051418/56815805550346895dc57580/html5/thumbnails/7.jpg)
Courtesy of R. Blewett
![Page 8: Van Keken, 2003](https://reader033.vdocuments.mx/reader033/viewer/2022051418/56815805550346895dc57580/html5/thumbnails/8.jpg)
Zegers and Van Keken, Geology, 2001
![Page 9: Van Keken, 2003](https://reader033.vdocuments.mx/reader033/viewer/2022051418/56815805550346895dc57580/html5/thumbnails/9.jpg)
Zegers and Van Keken, Geology, 2001
![Page 10: Van Keken, 2003](https://reader033.vdocuments.mx/reader033/viewer/2022051418/56815805550346895dc57580/html5/thumbnails/10.jpg)
Zegers and Van Keken, Geology, 2001
![Page 11: Van Keken, 2003](https://reader033.vdocuments.mx/reader033/viewer/2022051418/56815805550346895dc57580/html5/thumbnails/11.jpg)
Zegers and Van Keken, Geology, 2001