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Reconstructing middle Miocene tectonic boundary conditions

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Presentation on theme: "Reconstructing middle Miocene tectonic boundary conditions"— Presentation transcript:

1 Reconstructing middle Miocene tectonic boundary conditions
Nicholas Herold, Seton, M., Müller, R. D. and You., J. University of Cambridge 11th August, 2008

2 This talk... Part 1. Reconstructing the oceans
Part 2. Reconstructing topography Part 3. Reconstructing middle Miocene palaeogeography – is it worth it? Part 4. Combining palaeogeography with other model boundary conditions

3 Miocene Climatic Optimum (MCO)
Why the Miocene? Miocene Climatic Optimum (MCO) TIME (Ma) Zachos et al. (2001)

4 Reconstructing the oceans

5 Age distribution at 15 Ma

6 Age converted to depth

7 Depth error based on age

8 Sediment thickness Global modern sediment thickness:

9 Predicted sediment thickness 15 Ma

10 Large igneous provinces (LIPs)
With surrounding seafloor Without surrounding seafloor

11 Bathymetric reconstruction
Age converted depth Age Sediment thickness LIPS

12 Topography/bathymetry
MIOCENE MODERN

13 Adjustments for climate models
Narrow gateways Marginal seas

14 Mediterranean

15 Reconstructing Miocene palaeogeography – is it worth it?

16 General Circulation Model
NCAR Community Atmosphere Model and Community Land Model. ~3.75° x 3.75° horizontal resolution, 26 atmospheric layers. cpl lnd ice atm ocn Simulates energy, heat and moisture transfer within and between the atmosphere and land.

17 Combining palaeogeography with other boundary conditions
- Greenhouse gases - Orbital parameters Solar constant River Transport

18 Mean annual surface temperature

19 Model-data temperature discrepancies
Mean discrepancy: -1.7°C

20 Model-data precipitation discrepancies
Mean discrepancy: -172 mm/year

21 In summary New Miocene palaeogeography.
Preliminary results of a Miocene climate simulation: too cool and arid compared to proxy data. Need to run coupled climate simulations using new palaeogeography in order to better resolve and understand proxy-model discrepancies.

22 Thanks... Müller, R.D., Sdrolias, M., Gaina, C. and Roest, W.R., Age, spreading rates and spreading asymmetry of the world's ocean crust. Geochemistry, Geophysics, Geosystems.: Q04006. Müller, R.D., Sdrolias, M., Gaina C., Steinberger B. and C., H., Long-Term Sea-Level Fluctuations Driven by Ocean Basin Dynamics. Science, 319(5868):

23 Kearey and Vine, 1996

24 Annual zonal mean sea surface temperature

25 References Stampfli, G.M. and Borel, G.D., A plate tectonic model for the Paleozoic and Mesozoic constrained by dynamic plate boundaries and restored synthetic oceanic isochrons. Earth and Planetary Science Letters, 196(1-2):

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