User:Mblan45/sandbox Challis Arc

Article I added content to: Challis Arc

''Notes for grading: The Moye, Dostal, and Ickert sources are my original findings. Everything in bold is my own addition to the article. The links to other Wikipedia articles added were for the North Cascades, tectonics, the Farallon/North American/Pacific Plates, volcanic fields, and volcanic arcs. Original sentences in the article with strikethroughs were reworded.''

''The original article only had one source. I googled all sentences in the initial article and found no evident plagiarism. I also checked the source used and saw that all information was adequately summarized from it. There was no plagiarism to be fixed.'' = Challis Arc = From Wikipedia, the free encyclopedia The Challis Arc was an Eocene volcanic arc  volcanic field that stretched from southwestern British Columbia through Washington to Idaho, United States. '''The volcanic field extended between 42 and 49 degrees north latitude and was about 1500 kilometers in length. It exhibited volcanic activity for about 10 million years.''' Remnants of the Challis Arc are found as granitic plutons in the North Cascades, the Okanagan Highlands and in southcentral Idaho.

The It was first theorized that the volcanic field arc formed 57 million years ago as a result of subduction of the eastern block of the Kula Plate, taking place between 57 million years ago and 37 million years ago. '''Some scientific publications argue that the Challis Arc was formed by more complex tectonic interactions. One proposed model theorizes that the Farallon plate underwent subduction and imbrication beneath the North American plate to form the Challis Arc. Another model suggests that intracontinental rifting and igneous activity between the Pacific and North American plates formed the Challis Arc. By definition, a volcanic arc is formed via subduction, so the Challis Arc's naming as an arc is a matter of debate among geologists. The current limited availability of historical geochemical data prevents any of the proposed theories from being confirmed or falsified, so there is still no consensus on the Challis Arc's formation.'''