Abstract
A major early Proterozoic orogen (Central Plains) more than 1000 km long and at least 500 km wide has been delineated in the subsurface of Nebraska, Kansas, and Missouri as a result of a new compilation of Precambrian basement drill data in the northern midcontinent. The orogen is composed of metamorphic and granitoid rocks in the ringe 1.63–1.80 Ga, and it is interpreted on the basis of isotopic ages, rock types, and structure—as reflected by magnetic and gravity anomalies—as being the eastward extension of the early Proterozoic foldbelt exposed in basement uplifts in Colorado and southeastern Wyoming. It truncates the southern margin of the Superior Archean craton and its marginal early Proterozoic orogens, the Penokean (1.83–1.90 Ga) and the Trans-Hudson (1.85–1.95 Ga). The pattern of intersecting Proterozoic mobile belts marginal to Archean cratons is comparable to that in other continents, such as Western Australia and southern Africa.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
