Kinneyia, a fossil hydrodynamic instability

Add to your list(s) Download to your calendar using vCal

• Lucas Goering, Max Planck Institute for Dynamics, Germany
• Thursday 23 April 2015, 12:00-13:00
• Open Plan Area, BP Institute, Madingley Rise CB3 0EZ.

If you have a question about this talk, please contact Catherine Pearson.

Microbial mats from over half the history of the Earth have been fossilised with intriguing ripple patterns on them, a few millimetres wide. We show that these features can be caused by a Kelvin-Helmholz-like instability, of the flow of water over a viscoelastic fluid like the protein-rich slimy matrix of a microbial colony. By a combination of analogue experiments, and linear stability analysis, we show that the conditions for the formation of such small-scale ripples should be incredibly generic, and also develop a scaling analysis for their wavelength selection. This allows us to use the structure of Kinneyia as an indicator of the growth conditions of algal mats in the deep precambrian.

This talk is part of the Institute for Energy and Environmental Flows (IEEF) series.

This talk is included in these lists:

• All Talks (aka the CURE list)
• Cambridge Energy Seminars
• Department of Earth Sciences seminars
• Institute for Energy and Environmental Flows (IEEF)
• NanoDTC Energy Materials Talks
• Open Plan Area, BP Institute, Madingley Rise CB3 0EZ
• history
• ps635

Note that ex-directory lists are not shown.