|
|||||
|
|
Large tectonic rotation of part of New Zealand in the last 5 Ma |
|
| Authors: | IC Wright RI Walcott |
| Institution: | aResearch School of Earth Sciences, Victoria University of Wellington, Wellington New Zealand |
| Abstract: | Detailed paleomagnetic data from the Wairoa Syncline, a middle Miocene to the present forearc basin on the East Coast of the North Island, New Zealand, show that the rate of clockwise rotation for the last 5 Ma has been 7–8°/Ma of which less than 1.5°/Ma can be explained by apparent polar wander due to motion of the Australian or Pacific plates. This rotation is similar to a present-day rate of 7°/Ma determined from geodetic data. Between 5 and 20 Ma ago the rate of tectonic rotation is poorly determined and may be between 0° and 2°/Ma. The change in the rate of rotation of the Wairoa Syncline around 5 Ma is probably related to a markedly different tectonic style in the New Zealand region within the last 5 Ma, associated with a change in position of the Euler poles of rotation for the Pacific-Australian plates. |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ | |