Harbert, W and Cox, A
(1989)
Late Neogene motion of the Pacific plate.
Journal of Geophysical Research, 94 (B3).
3052 - 3064.
ISSN 0148-0227
Abstract
Oceanic crust between 38°S and 65°S along the Pacific-Antarctic ridge records a complete history of Neogene Pacific-Antarctic motion. Our analysis shows that a change in Pacific-Antarctic relative motion occurred between chron 2A, 3.40 Ma, and the beginning of chron 3 time, 3.86 Ma. We used 203 estimates of Pacific-Antarctic spreading velocity to calculate a 0-3.4 Ma and 3.86-10.3 Ma Euler pole. Combined with tracks of seamounts that record the passage of the Pacific plate over mantle plumes our data show that this change in relative motion corresponds to a change in the absolute motion of the Pacific plate with respect to the hotspot frame of reference. Using these Euler poles to calculate Pacific-Antarctic-Africa-North America circuit Euler poles show that this recent change in Pacific plate absolute motion corresponds to a change from strike-slip to transpressive motion along the coastal California Pacific-North America plate boundary. Interestingly, this age of increased tectonism agrees in time with deformation in New Zealand and northern Japan. -from Authors
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