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Late Neogene motion of the Pacific plate

Harbert, W and Cox, A (1989) Late Neogene motion of the Pacific plate. Journal of Geophysical Research, 94 (B3). 3052 - 3064. ISSN 0148-0227

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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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Details

Item Type: Article
Status: Published
Creators/Authors:
CreatorsEmailPitt UsernameORCID
Harbert, Wharbert@pitt.eduHARBERT
Cox, A
Date: 1 January 1989
Date Type: Publication
Access Restriction: No restriction; Release the ETD for access worldwide immediately.
Journal or Publication Title: Journal of Geophysical Research
Volume: 94
Number: B3
Page Range: 3052 - 3064
DOI or Unique Handle: 10.1029/jb094ib03p03052
Institution: University of Pittsburgh
Schools and Programs: Dietrich School of Arts and Sciences > Geology and Planetary Science
Refereed: Yes
ISSN: 0148-0227
Date Deposited: 25 Aug 2012 17:40
Last Modified: 02 Feb 2019 15:57
URI: http://d-scholarship.pitt.edu/id/eprint/13591

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