Computer Science
Scientific paper
Oct 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982e%26psl..60..429g&link_type=abstract
Earth and Planetary Science Letters, Volume 60, Issue 3, p. 429-436.
Computer Science
19
Scientific paper
A compilation of 417 isotopic dates on mid and late Cenozoic igneous rocks from the southwestern United States shows that volcanism migrated northward with time. The principal locus of volcanism at any given time was an east-west band that corresponded closely with the calculated position of the subducted Mendocino fracture zone (MFZ) under the North American plate. This correspondence supports the theory that volcanism was triggered by subduction of the MFZ, which was a major (1 km) north-facing topographic step in the Farallon plate. Both volcanism and the MFZ moved northward at about 3.1 cm/year. Andesites and rhyolites show close correspondence to MFZ passage, but many basalts were erupted significantly later. Cooling dates on basement rocks in southern Arizona cluster at the time the MFZ passed under that area.
Earlier models proposing rapid late Tertiary steepening of the subducted Farallon plate were based on a westward sweep of volcanism. Our compilation shows no evidence for such a westward sweep.
Glazner Allen F.
Supplee Jeffrey A.
No associations
LandOfFree
Migration of Tertiary volcanism in the southwestern United States and subduction of the Mendocino fracture zone does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Migration of Tertiary volcanism in the southwestern United States and subduction of the Mendocino fracture zone, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Migration of Tertiary volcanism in the southwestern United States and subduction of the Mendocino fracture zone will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1029835