Abstract

The Middle Proterozoic St. Francois igneous terrane of southeast Missouri is located on the northwest margin of the Reelfoot rift and was modified into a northeast-trending structural block during periods of Late Proterozoic-Early Cambrian extension and shoulder uplift. Late Cambrian facies patterns indicate that the St. Francois terrane was not a passive basement feature during early periods of thermal subsidence of the Reelfoot rift. Facies relations also show that basement response to syndepositional tectonics is the principal control on rift-margin geometry, and not sedimentary loading as assumed by models. Syndepositional tectonics that influenced southeast Missouri during Late Cambrian time are interpreted to be a result of in-plane stress related to changing regional stress fields.

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.