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Geology; June 2004; v. 32; no. 6; p. 485-488; DOI: 10.1130/G20409.1
© 2004 Geological Society of America
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Modeling seafloor-spreading rates through time

Robert V. Demicco1

1 Department of Geological Sciences and Environmental Studies, Binghamton University, Binghamton, New York 13902-6000, USA

A steady-state model of crust production and destruction for the past 180 m.y. was proposed by B. Parsons and advocated by D. Rowley. Such a model has serious implications for models of secular variations in, e.g., global sea level, global climate, and seawater chemistry. This paper presents an analysis of the steady-state model and then offers alternative extensions of that model that allow for non–steady-state production of ocean crust with time. Results suggest that the observed linear decrease in area versus age of ocean floor does not force a steady-state view of seafloor spreading.

Key Words: seafloor spreading • crust production • ocean-floor evolution • global cycles • genetic algorithms




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