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Reconstructing middle Miocene tectonic boundary conditions

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Reconstructing middle Miocene tectonic boundary conditions

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Reconstructing middle Miocene tectonic boundary conditions

Nicholas Herold, Seton, M., Müller, R. D. and You., J.

University of Cambridge

11th August, 2008

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

Miocene Climatic Optimum (MCO)

TIME (Ma)

Zachos et al. (2001)

Global modern sediment thickness:

http://www.ngdc.noaa.gov/mgg/sedthick/sedthick.html

With surrounding seafloor

Without surrounding seafloor

Age converted depth

Age

Sediment thickness

LIPS

MIOCENE

MODERN

Narrow gateways

Marginal seas

?

- NCAR Community Atmosphere Model and Community Land Model.
- ~3.75° x 3.75° horizontal resolution, 26 atmospheric layers.

atm

lnd

ice

cpl

ocn

- Other boundary conditions
- - Greenhouse gases
- - Orbital parameters
- Solar constant
- River Transport

Mean discrepancy: -1.7°C

Mean discrepancy: -172 mm/year

- 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.

- Müller, R.D., Sdrolias, M., Gaina, C. and Roest, W.R., 2008. 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., 2008. Long-Term Sea-Level Fluctuations Driven by Ocean Basin Dynamics. Science, 319(5868): 1357-1362.

Kearey and Vine, 1996

- Stampfli, G.M. and Borel, G.D., 2002. 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): 17-33.