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Contacts, collisions, sutures, belts, and margins -- new GSA Bulletin content
Date:4/9/2013

nnected or sutured together about 1,750-million years ago, and they now make up part of the stable core of the North American continent and underlie much of the central and southern Rocky Mountains. The authors present a new detailed dataset collected using modern analysis techniques that were not available when the area was last examined in detail 25 to 30 years ago. This dataset, combined with other new data from the region, indicates that the Wyoming and Colorado provinces collided obliquely rather than head on as previously thought. The authors' conceptual model for the Cheyenne belt suture zone explains a number of different geologic phenomena including the orientations of faults at the boundary between the two plates, the differences in temperatures at which the rocks were deformed across these faults, and a 2 to 10 km difference in the thickness of Earth's crust across the fossil plate boundary.


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Contact: Kea Giles
kgiles@geosociety.org
Geological Society of America
Source:Eurekalert

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