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Cheyenne belt : ウィキペディア英語版 | Cheyenne belt The Cheyenne Belt is the tectonic suture zone between the Archean-age Wyoming craton to the north and the Paleoproterozoic-age Yavapai province to the south. It runs through the southeastern quadrant of the state of Wyoming, USA. It was formed during the Paleoproterozoic Medicine Bow orogeny between 1.78 and 1.74 billion years ago when island arcs collided with the Wyoming craton. This is an example of a convergent boundary in Tectonics. The exposed geology consists of a series of northeast-striking, steeply-dipping shear zones.〔 ==References==
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抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』 ■ウィキペディアで「Cheyenne belt」の詳細全文を読む
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