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Geological Society, London, Special Publications; 1992; v. 60; p. 107-116;
DOI: 10.1144/GSL.SP.1992.060.01.06
© 1992 Geological Society of London

Along-axis variations in tectonic extension and accommodation zones in the MARK Area, Mid-Atlantic Ridge 23°N latitude

Jeffrey A. Karson & Alec T. Winters1

Department of Geology, Duke University, Durham, NC 27706, USA
1 , 644 27th Avenue, San Francisco, CA 94121, USA

Multidisciplinary studies of the slow-spreading (<30 mm a–1) ridge axis in the MARK Area define a number of discrete spreading cells in each of which the style of seafloor spreading is distinctly different. In some cells, episodic magmatism and asymmetrical detachment faulting occur, whereas in others, a more continuous magma supply and symmetrical, steep, normal faulting dominate. Oblique-slip fault zones that link the cells are a kinematic requirement of such along-strike variations and are similar to the accommodation or transfer zones of continental rifts.