Spatial variations in the composition of turbidites due to hydrodynamic fractionation
Article first published online: 12 AUG 2013
©2013. American Geophysical Union. All Rights Reserved.
Geophysical Research Letters
Volume 40, Issue 15, pages 3919–3923, 16 August 2013
How to Cite
2013), Spatial variations in the composition of turbidites due to hydrodynamic fractionation, Geophys. Res. Lett., 40, 3919–3923, doi:10.1002/grl.50767., , and (
- Issue published online: 28 AUG 2013
- Article first published online: 12 AUG 2013
- Accepted manuscript online: 22 JUL 2013 10:43PM EST
- Manuscript Accepted: 18 JUL 2013
- Manuscript Revised: 16 JUL 2013
- Manuscript Received: 17 JUN 2013
- turbidity currents;
 This study uses measurements from physical experiments to document turbidity currents, which are density currents composed of suspended sediment and water, to be effective at hydrodynamically fractionating minerals on the basis of grain density and grain shape alone, resulting in large-scale spatial variations in the composition of their deposits. While grain composition varies spatially, the population sampled at any one location is hydrodynamically equivalent. Spatial variations in composition of the deposits are modeled using exponential decay functions, which are based on initial concentration of grain types and their respective differences in settling velocity. We further discuss implications of this process for addressing practical geophysical problems, in which mineralogical distributions are important, such as provenance and geochronology studies, subsurface imaging, and predicting bulk properties of subsurface reservoirs.