1. Mantle wedge processes
Limits of SZ
‘cold nose’
Van Keken, 2003

2. Compositional stratification
Basaltic crust
Harzburgitic mantle
Peridotitic mantle
45 km
7 km
Van Keken, EPSL, 2003

3. Tpot= K higher
Abbott et al., JGR, 1994

4. Compositional stabilization of oceanic lithosphere
Vlaar et al., EPSL, 1994

5. Pre-plate tectonic cooling mechanism (?)
Sufficient to cool to near-present day
Tpot within 1 Byr
Vlaar et al., EPSL, 1994

7. Courtesy of R. Blewett

8. Zegers and Van Keken, Geology, 2001

9. Zegers and Van Keken, Geology, 2001

10. Zegers and Van Keken, Geology, 2001

11. Zegers and Van Keken, Geology, 2001