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Central and South Pacific Plate Tect...

Croon, Marcel Bernard.

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Central and South Pacific Plate Tectonic Reconstructions.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	Central and South Pacific Plate Tectonic Reconstructions./
Author:	Croon, Marcel Bernard.
Description:	207 p.
Notes:	Source: Dissertation Abstracts International, Volume: 72-08, Section: B, page: .
Contained By:	Dissertation Abstracts International72-08B.
Subject:	Geology. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3457701
ISBN:	9781124685977

Central and South Pacific Plate Tectonic Reconstructions.
Croon, Marcel Bernard.

Central and South Pacific Plate Tectonic Reconstructions. - 207 p.

Source: Dissertation Abstracts International, Volume: 72-08, Section: B, page: .

Thesis (Ph.D.)--University of California, San Diego, 2011.

Several aspects of the plate tectonic evolution of the ridge systems and structural development of oceanic crust in the Central and South Pacific basins are investigated. In the South Pacific surveys of magnetic anomaly data and multibeam bathymetry of the Menard and Pitman Fracture Zones, &sim;3500 km apart, allowed for significant refinement of the Pacific-Antarctic plate motion history over the last 44 million years. We tested the predictive quality of the high-resolution plate motion model at the southwestern end of the Pacific-Antarctic Ridge close to the Macquarie Triple Junction and showed that reconstructions predict phases of transform fault motion and extension to great detail. In particular, the most recent period of extension since 10 million years ago occurred when a &sim;1200 km long transform fault was replaced an array of 15 transform faults and short spreading centers.

ISBN: 9781124685977Subjects--Topical Terms:

516570
Geology.

Central and South Pacific Plate Tectonic Reconstructions.
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020 $a 9781124685977
035 $a (UMI)AAI3457701
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100 1 $a Croon, Marcel Bernard. $3 1683788
245 1 0 $a Central and South Pacific Plate Tectonic Reconstructions.
300 $a 207 p.
500 $a Source: Dissertation Abstracts International, Volume: 72-08, Section: B, page: .
500 $a Adviser: Steven C. Cande.
502 $a Thesis (Ph.D.)--University of California, San Diego, 2011.
520 $a Several aspects of the plate tectonic evolution of the ridge systems and structural development of oceanic crust in the Central and South Pacific basins are investigated. In the South Pacific surveys of magnetic anomaly data and multibeam bathymetry of the Menard and Pitman Fracture Zones, &sim;3500 km apart, allowed for significant refinement of the Pacific-Antarctic plate motion history over the last 44 million years. We tested the predictive quality of the high-resolution plate motion model at the southwestern end of the Pacific-Antarctic Ridge close to the Macquarie Triple Junction and showed that reconstructions predict phases of transform fault motion and extension to great detail. In particular, the most recent period of extension since 10 million years ago occurred when a &sim;1200 km long transform fault was replaced an array of 15 transform faults and short spreading centers.
520 $a The detailed plate motion model for the Pacific-Antarctic Ridge was used to test whether abyssal hill tip curvatures correlate to changes in plate motion direction, which lead to periods of transtension and transpression. The tip of the ridge axis can deflect up to 60° into the transform fault in response to changes in the stress field at ridge-transform-intersections. This is observed to have occurred in particular during periods of significant transtension. In addition, abyssal hill curvatures in the opposite sense are observed to have developed during periods of transpression when increased coupling across an oceanic transform fault is partially accommodated by distributed strike-slip deformation rather than solely by discontinuous displacement at the transform fault.
520 $a In the equatorial Pacific region, where the total field magnetic anomalies are very small for oceanic crust formed at the North-South striking East Pacific Rise, towed and aeromagnetic vector magnetometer data allowed for better constraints of the relative motions of the Pacific-Cocos Ridge near the Galapagos Triple Junction. These data in combination with available magnetic anomaly profiles for most of the East Pacific ridge were used to improve plate reconstructions for the Pacific-Cocos, Pacific-Nazca, Cocos-Nazca, Pacific-Antarctic, Chile Ridge and Mathematician Paleo-Ridge since 9 Ma.
590 $a School code: 0033.
650 4 $a Geology. $3 516570
650 4 $a Geophysics. $3 535228
650 4 $a Marine Geology. $3 1674685
650 4 $a Plate Tectonics. $3 544533
690 $a 0372
690 $a 0373
690 $a 0556
690 $a 0592
710 2 $a University of California, San Diego. $b Earth Sciences. $3 1035583
773 0 $t Dissertation Abstracts International $g 72-08B.
790 1 0 $a Cande, Steven C., $e advisor
790 1 0 $a Blackman, Donna K. $e committee member
790 1 0 $a Gee, Jeffrey S. $e committee member
790 1 0 $a Milstein, Laurence B. $e committee member
790 1 0 $a Sandwell, David T. $e committee member
790 $a 0033
791 $a Ph.D.
792 $a 2011
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3457701