THE ROLE OF RIFTING IN THE TECTONIC DEVELOPMENT OF THE MIDCONTINENT, U.S.A.

摘要: Abstract Recent studies have proposed the existence of several major ancient rift zones in midcontinent region North America. Although dating some these rifts (and even interpretations) are subject to question, an analysis “paleo-rifts” reveals three episodes rifting: Keweenawan (~ 1.1 b.y. B.P.), Eocambrian 600 m.y. and early Mesozoic 200 B.P.). The extent events documents that rifting has played a role tectonic development region. This goes well beyond initial event because features display strong correlation with Paleozoic basins propensity for reactivation. For example, Reelfoot was reactivated form Mississippi embayment is site modern seismicity which suggests reactivation contemporary stress field ENE compression. Even though importance can be established, recognition delineation their complexities remain problem requires more study.