Massonne et al., (1999) Diamond bearing inclusions in garnet (after Stöckhert et al., 2001)

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Presentation transcript:

Massonne et al., (1999)

Diamond bearing inclusions in garnet (after Stöckhert et al., 2001)

After Massonne et al. (1999), Stöckhert et al. (2001)

Geodynamic environment

Krohe (1996) Franke (1989)

Zulauf (1997) Subduction Subduction+Collision Collision Delamination+detachment+underplating

Exhumation of high-pressure rocks during delamination+detachment+underplating stage

Numerical modeling: Schott & Schmeling (1998), Willner et al. (2002)

Depth=200 km Willner et al. (2002) Formation and destruction of deep crustal wedge during detachment of the lithosphere Depth=150 km Depth=100 km

Question: how and whether subduction->collision->detachment sequence of events might be genetically related to origin of the diamond bearing rocks? Method: numerical geodynamic modeling

1600 x 600 km 370 x 200km 400 o C 800 o C 1200 o C 200 o C 400 o C 600 o C 800 o C 1000 o C 1400 o C Weak zone Lithosphere Asthenosphere 1600 o C Mantle plume upwelling Slab push Slab pull 1400 o C Continental crust Oceanic crust Sediments Serpentinized mantle Hydrated zone Rock samples Antigorite stability field Hydration front Numerical model (full convection solution) High resolution region

Animation “Typical evolution”

0.00 Myr 890 x 470 km 370 x 200km 400 o C 800 o C 1200 o C 200 o C 400 o C 600 o C 800 o C 1000 o C Initial configuration

0.21 Myr 400 o C 800 o C 1200 o C 200 o C 400 o C 600 o C 800 o C 1000 o C Subduction

0.68 Myr 400 o C 800 o C 1200 o C 200 o C 400 o C 600 o C 800 o C 1000 o C Subduction

1.4 Myr 400 o C 800 o C 1200 o C 200 o C 400 o C 600 o C 800 o C 1000 o C Subduction

2.1 Myr 400 o C 800 o C 1200 o C 200 o C 400 o C 600 o C 800 o C 1000 o C Subduction

3.1 Myr 400 o C 800 o C 1200 o C 200 o C 400 o C 600 o C 800 o C 1000 o C Subduction

4.6 Myr 400 o C 800 o C 1200 o C 200 o C 400 o C 600 o C 800 o C 1000 o C Subduction

7.7 Myr 400 o C 800 o C 1200 o C 200 o C 400 o C 600 o C 800 o C 1000 o C Subduction

11.3 Myr 400 o C 800 o C 1200 o C 200 o C 400 o C 600 o C 800 o C 1000 o C Subduction

15.0 Myr 400 o C 800 o C 1200 o C 200 o C 400 o C 600 o C 800 o C 1000 o C Subduction

18.9 Myr 400 o C 800 o C 1200 o C 200 o C 400 o C 600 o C 800 o C 1000 o C Subduction

22.7 Myr 400 o C 800 o C 1200 o C 200 o C 400 o C 600 o C 800 o C 1000 o C Subduction

25.3 Myr 400 o C 800 o C 1200 o C 200 o C 400 o C 600 o C 800 o C 1000 o C Subduction

26.2 Myr 400 o C 800 o C 1200 o C 200 o C 400 o C 600 o C 800 o C 1000 o C Subduction

27.0 Myr 400 o C 800 o C 1200 o C 200 o C 400 o C 600 o C 800 o C 1000 o C Collision

27.7 Myr 400 o C 800 o C 200 o C 400 o C 600 o C 800 o C 1000 o C Collision ~160 km (bottom of the lithosphere) 1200 o C ~160 km

28.3 Myr 400 o C 800 o C 1200 o C 200 o C 400 o C 600 o C 800 o C 1000 o C Collision, Delamination Slab delamination

28.9 Myr 400 o C 800 o C 1200 o C 200 o C 400 o C 600 o C 800 o C 1000 o C Collision, Delamination, Necking Slab delamination Slab necking

29.4 Myr 400 o C 800 o C 1200 o C 200 o C 400 o C 600 o C 800 o C 1000 o C Collision, Necking Slab necking

29.8 Myr 400 o C 800 o C 1200 o C 200 o C 400 o C 600 o C 800 o C 1000 o C Extension, Detachment, Underplating Mantle underplating

30.3 Myr 400 o C 800 o C 1200 o C 200 o C 400 o C 600 o C 800 o C 1000 o C Extension, Detachment, Underplating Mantle underplating

30.7 Myr 400 o C 800 o C 1200 o C 200 o C 400 o C 600 o C 800 o C 1000 o C Extension, Detachment, Underplating Mantle underplating

30.9 Myr 400 o C 800 o C 1200 o C 200 o C 400 o C 600 o C 800 o C 1000 o C Extension, Detachment, Underplating

31.2 Myr 400 o C 800 o C 1200 o C 200 o C 400 o C 600 o C 800 o C 1000 o C Extension, Detachment, Underplating

31.5 Myr 400 o C 800 o C 1200 o C 200 o C 400 o C 600 o C 800 o C 1000 o C Extension, Detachment, Underplating

31.8 Myr 400 o C 800 o C 1200 o C 200 o C 400 o C 600 o C 800 o C 1000 o C Extension, Detachment, Underplating, Domal structures Domal structure growth

32.1 Myr 400 o C 800 o C 1200 o C 200 o C 400 o C 600 o C 800 o C 1000 o C Extension, Detachment, Underplating, Domal structures Domal structures growth

32.4 Myr 400 o C 800 o C 1200 o C 200 o C 400 o C 600 o C 800 o C 1000 o C Extension, Detachment, Underplating, Domal structures Domal structures growth

32.6 Myr 400 o C 800 o C 1200 o C 200 o C 400 o C 600 o C 800 o C 1000 o C Extension, Detachment, Underplating, Domal structures Domal structures growth

32.9 Myr 400 o C 800 o C 1200 o C 200 o C 400 o C 600 o C 800 o C 1000 o C Extension, Detachment, Underplating, Domal structures Domal structures growth

33.3 Myr 400 o C 800 o C 1200 o C 200 o C 400 o C 600 o C 800 o C 1000 o C Extension, Detachment, Underplating, Domal structures Domal structures growth

33.6 Myr 400 o C 800 o C 1200 o C 200 o C 400 o C 600 o C 800 o C 1000 o C Extension, Detachment, Underplating, Domal structures Domal structures growth

34.1 Myr 400 o C 800 o C 1200 o C 200 o C 400 o C 600 o C 800 o C 1000 o C Extension, Detachment, Underplating, Domal structures Domal structures growth

36.4 Myr 400 o C 800 o C 1200 o C 200 o C 400 o C 600 o C 800 o C 1000 o C Extension, Detachment, Underplating, Domal structures Domal structures growth

37.5 Myr 400 o C 800 o C 1200 o C 200 o C 400 o C 600 o C 800 o C 1000 o C Extension, Detachment, Underplating, Domal structures Domal structures growth

39.6 Myr 400 o C 800 o C 1200 o C 200 o C 400 o C 600 o C 800 o C 1000 o C The End Domal structures growth

200 o C 400 o C 600 o C 800 o C 1000 o C ~160 km (bottom of the lithosphere) Stoeckhert et al. (2001) Cooling stage

“Heating+Cooling during subduction” Gerya & Stoeckhert (2002) Active margin B BEGIN

Isobaric cooling 19.3 Myr 1000 o C 200 o C 800 o C 400 o C 1200 o C 600 o C Stoeckhert et al. (2001) Cooling stage ~100 km (bottom of the lithosphere)

What does slab break-off look like? ? ?

Animation “Slow necking”

400 o C 800 o C 1200 o C 200 o C 400 o C 600 o C 800 o C 1000 o C 1200 o C 5.0 Myr Collision

400 o C 800 o C 1200 o C 200 o C 400 o C 600 o C 800 o C 1000 o C 1200 o C 5.8 Myr Collision

400 o C 800 o C 1200 o C 200 o C 400 o C 600 o C 800 o C 1000 o C 1200 o C 6.6 Myr Collision + Delamination

400 o C 800 o C 1200 o C 200 o C 400 o C 600 o C 800 o C 1000 o C 1200 o C 7.3 Myr Collision + Delamination

400 o C 800 o C 1200 o C 200 o C 400 o C 600 o C 800 o C 1000 o C 1200 o C 8.0 Myr Collision + Delamination

400 o C 800 o C 1200 o C 200 o C 400 o C 600 o C 800 o C 1000 o C 1200 o C 8.7 Myr Collision + Delamination

400 o C 800 o C 1200 o C 200 o C 400 o C 600 o C 800 o C 1000 o C 1200 o C 9.3 Myr Collision + Delamination

400 o C 800 o C 1200 o C 200 o C 400 o C 600 o C 800 o C 1000 o C 1200 o C 10.0 Myr Collision + Delamination

400 o C 800 o C 1200 o C 200 o C 400 o C 600 o C 800 o C 1000 o C 1200 o C 10.7 Myr Collision + Delamination

400 o C 800 o C 1200 o C 200 o C 400 o C 600 o C 800 o C 1000 o C 1200 o C 11.4 Myr Delamination

400 o C 800 o C 1200 o C 200 o C 400 o C 600 o C 800 o C 1000 o C 1200 o C 12.1 Myr Delamination

400 o C 800 o C 1200 o C 200 o C 400 o C 600 o C 800 o C 1000 o C 1200 o C 12.8 Myr Delamination

400 o C 800 o C 1200 o C 200 o C 400 o C 600 o C 800 o C 1000 o C 1200 o C 13.4 Myr Delamination

400 o C 800 o C 1200 o C 200 o C 400 o C 600 o C 800 o C 1000 o C 1200 o C 14.0 Myr Detachment

400 o C 800 o C 1200 o C 200 o C 400 o C 600 o C 800 o C 1000 o C 1200 o C 14.6 Myr Detachment

400 o C 800 o C 1200 o C 200 o C 400 o C 600 o C 800 o C 1000 o C 1200 o C 15.2 Myr Detachment

400 o C 800 o C 1200 o C 200 o C 400 o C 600 o C 800 o C 1000 o C 1200 o C 15.7 Myr Detachment

400 o C 800 o C 1200 o C 200 o C 400 o C 600 o C 800 o C 1000 o C 1200 o C 16.3 Myr Detachment

400 o C 800 o C 1200 o C 200 o C 400 o C 600 o C 800 o C 1000 o C 1200 o C 16.9 Myr Detachment

400 o C 800 o C 1200 o C 200 o C 400 o C 600 o C 800 o C 1000 o C 1200 o C 17.5 Myr End

Animation “Rapid necking”

400 o C 800 o C 1200 o C 200 o C 400 o C 600 o C 800 o C 1000 o C 30.6 Myr Collision

400 o C 800 o C 1200 o C 200 o C 400 o C 600 o C 800 o C 1000 o C 31.3 Myr Collision

400 o C 800 o C 1200 o C 200 o C 400 o C 600 o C 800 o C 1000 o C 32.3 Myr Collision

400 o C 800 o C 1200 o C 200 o C 400 o C 600 o C 800 o C 1000 o C 1200 o C 33.1 Myr Detachment

400 o C 800 o C 1200 o C 200 o C 400 o C 600 o C 800 o C 1000 o C 1200 o C 34.1 Myr Extension + Underplating

400 o C 800 o C 1200 o C 200 o C 400 o C 600 o C 800 o C 1000 o C 1200 o C 34.8 Myr Extension + Underplating

400 o C 800 o C 1200 o C 200 o C 400 o C 600 o C 800 o C 1000 o C 1200 o C 35.4 Myr Extension + Underplating

400 o C 800 o C 1200 o C 200 o C 400 o C 600 o C 800 o C 1000 o C 1200 o C 35.9 Myr Extension + Underplating

400 o C 800 o C 1200 o C 200 o C 400 o C 600 o C 800 o C 1000 o C 1200 o C 36.3 Myr Extension + Underplating

400 o C 800 o C 1200 o C 200 o C 400 o C 600 o C 800 o C 1000 o C 1200 o C 36.7 Myr Extension + Underplating

400 o C 800 o C 1200 o C 200 o C 400 o C 600 o C 800 o C 1000 o C 1200 o C 37.0 Myr Extension + Underplating

400 o C 800 o C 1200 o C 200 o C 400 o C 600 o C 800 o C 1000 o C 1200 o C 37.3 Myr Extension + Underplating

400 o C 800 o C 1200 o C 200 o C 400 o C 600 o C 800 o C 1000 o C 1200 o C 37.6 Myr Extension + Underplating

400 o C 800 o C 1200 o C 200 o C 400 o C 600 o C 800 o C 1000 o C 1200 o C 38.0 Myr Extension + Underplating

400 o C 800 o C 1200 o C 200 o C 400 o C 600 o C 800 o C 1000 o C 1200 o C 38.4 Myr Extension + Underplating

400 o C 800 o C 1200 o C 200 o C 400 o C 600 o C 800 o C 1000 o C 1200 o C 38.8 Myr End

Symmetric necking (no preexisting weak zone) Assymmetric necking by shearing along preexisting weak zone But is this really “break-off”?

33 Myr 28 Myr 30 Myr 29 Myr