Thursday, May 16, 2013

Highlights: 2013 Honorary Member: Dale Leckie

In shelf regions, geostrophic currents, or flows in which the pressure gradient force is balanced by Coriolis forces, result in water motion at a low angle to the shoreline.  These currents have been interpreted to represent important mechanisms for cross-shelf transport.  In this paper, SEPM Honorary Member Dale Leckie and Krystinik (1989) summarized paleocurrent information from a number of ancient progradational shoreface successions to test the interpretation of the importance of these deposits.  Systematic analysis of 8 formations from North America and Europe revealed a predominance of currents oriented offshore at angles between 70-90 degrees,  a result interpreted to reflect a lack of record of geostrophic currents on the sedimentary record preserved in these successions.  So…the answer to the question in their title was interpreted to be… “no.”

Is there evidence for geostrophic currents preserved in the sedimentary record of inner to middle-shelf deposits? by Dale A. Leckie and Lee F. Krystinik, Journal of Sedimentary Research, v. 59, p. 862-870.

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