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Crustal evolution of the submarine plateaux of New Zealand and their tectonic reconstruction based on crustal balancing

Grobys, Jan Werner Gerhard
2007
Univ. Bremen
Monografie
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Deutsch
DOI: https://doi.org/10.23689/fidgeo-313
Grobys, Jan Werner Gerhard, 2007: Crustal evolution of the submarine plateaux of New Zealand and their tectonic reconstruction based on crustal balancing. Univ. Bremen, DOI: 10.23689/fidgeo-313.
 
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  • Zusammenfassung
Tectonics, marine geophysics, plate-tectonic reconstruction, new zealand, antarctica, seismic refraction/wide-angle reflection, Gondwana break-up. - The last supercontinent fell into pieces with the break-up of Gondwana. In this context, the separation of the microcontinent of New Zealand from Antarctica is a jigsaw puzzle of many pieces. Its parts lay at the convergent margin of East Gondwana, which changed into a divergent margin within a geologically short time. That is why the microcontinent of New Zealand experienced different tectonic regimes and phases of the Wilson cycle. Although it is a good object of investigation due to its changing history, remarkably little is known about the submerged parts of the microcontinent. Knowledge of the magmatic-tectonic development of the submarine plateaux such as Campbell Plateau and Chatham Rise will improve the understanding of the processes that led to the late Gondwana break-up, and, in turn, lead to better reconstructions of East Gondwana, as Zealandia is a key piece in plate-kinematic reconstructions of this part of Gondwana. The central part of this thesis deals with the separation process of Zealandia from Antarctica leading to an improved reconstruction of New Zealand with emphasis on the submarine plateaux. Bounty Trough separating Chatham Rise from Campbell Plateau, and the Great South Basin separating Campbell Plateau from the South Island are investigated with seismic refraction and reflection methods. They are interpreted jointly with magnetic and gravity data. The results of crustal thickness modelling based on satellite gravity data are combined with existing information about crustal thickness of Zealandia. With these data ...
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  • Geophysik, Extraterrestische Forschung [941]
Schlagworte:
Ozeanien {Geophysik}
Pazifischer Ozean {Geophysik}
Geotektonische Entwicklung der Erdkruste {Tektonik}
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