The seemingly enigmatic exposure of predominantly plutonic rocks on the outer walls of the Mid-Cayman Rise can be explained by a structural model involving both inward-facing and outward-facing normal faults in the region of the median valley. Movement along inward-facing faults must dominate within the median valley to produce the topography observed; the less prominent scarps, which result from movement along outward-facing faults, are readily concealed by talus and pelagic sediment. Movement along these outward-facing faults increases as the crust passes through the transition between median-valley and rift-mountain topography.

This content is PDF only. Please click on the PDF icon to access.

First Page Preview

First page PDF preview
You do not currently have access to this article.