Mount Bachelor is actually a volcano which lies along the Cascade Mountain Range in central Oregon. This convergent plate boundary was formed by the Juan de Fuca oceanic plate, subducting under the North American continental plate. This is an example of stresses by compression which was created by thrust faulting. Rock deposits found in the Cascades, mostly consist of Ultramafic rock which are specimens of the Earth's mantel. These rocks are believed by geologists to be created billions of years ago. Because they are so old, they likely have undergone extensive metamorphic recrystallization (deformation) by remelting at extremely high temperatures.
References:
https://geology.com/nsta/convergent-plate-boundaries.shtml
https://volcanoes.usgs.gov/volcanoes/mount_bachelor/
https://www.nature.nps.gov/geology/usgsnps/noca/nocageol2a.html
No comments:
Post a Comment