Le complexe d'instabilites sous-marines de Matakaoa, au large d'East Cape, Nouvelle-Zelande: processus de ttansport en masse impact des mega-instabilites sur l'architecture et l'evolution de la marine continental.
By: Joanne, Cathy.
Material type:
BookPublisher: Nice : Universite de Nice Sophia Antipolis, 2008Description: 246 p. : ill (some col.)., maps (some col.) ; 30 cm + CD-Rom.Subject(s): MARINE GEOLOGY
| EAST CAPE | MATAKAOA VOLCANIC GROUP | SEDIMENT TRANSPORT | CONTINENTAL MARGIN | THESESHoldings: GRETA POINT: 551.462.3 COM Dissertation note: Thesis (PhD--Marine Geology)--Universite de Nice Sophia Antipolis, 2008. Summary: "This study aims to describe and characterize the main mass-movements that affected the Matakaoa continental margin, north of New Zealand, and to evaluate the effects of such catastrophic events on the architectural evolution of the margin on the short to long term. Interpretation of multichannel seismic reflexion profiles and multibeam bathymetry data allowed to identify the scars and mass-transport deposits associated with three major Plio-Quaternary gravitary events. Failure and transport mechanisms are studied, as well as the effects of slided masses (> 100 km3) on basin sediments. Morpho-structural characters of mass-transport deposits show the strong transport energy and erosive power of moving masses, so demonstrating the cataclysmic character of the events long-term effects of mega-instabilities onto the continental margin arc analyzed through the study of post-avalanche reconstruction processes. Although the post-avalanche evolution of a continental margin tends, at first approach, to restore a stable slope, the stacking of post-avalanche sedimentation onto unstructured avalanche deposits and over-critical slopes contributes to maintain the local instability of the margin. Short-term effects of instabilities include the tsunami risk, which is studied in order to evaluate the potential hazard on the northern coast of the Raukumara Peninsula. A sedimentological approach, based on the study of sediment cores collected on the Matakaoa margin, allows a stratigraphic analysis of post-avalanche Sediments and enlarges the study upon other processes contributing to sediment transfers towards the deep basin."
| Item type | Current library | Call number | Copy number | Status | Date due | Barcode | |
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BOOK
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WELLINGTON BOOKS | 551.462.3 COM | 1 | Available | B07230 |
"These pour obtenir Ie titre de doctor en sciences, discipline : Sciences de l'Univers - Specialite : Geologie Marine".
Thesis (PhD--Marine Geology)--Universite de Nice Sophia Antipolis, 2008.
Includes bibliographical references (p.231-246).
"This study aims to describe and characterize the main mass-movements that affected the Matakaoa continental margin, north of New Zealand, and to evaluate the effects of such catastrophic events on the architectural evolution of the margin on the short to long term. Interpretation of multichannel seismic reflexion profiles and multibeam bathymetry data allowed to identify the scars and mass-transport deposits associated with three major Plio-Quaternary gravitary events. Failure and transport mechanisms are studied, as well as the effects of slided masses (> 100 km3) on basin sediments. Morpho-structural characters of mass-transport deposits show the strong transport energy and erosive power of moving masses, so demonstrating the cataclysmic character of the events long-term effects of mega-instabilities onto the continental margin arc analyzed through the study of post-avalanche reconstruction processes. Although the post-avalanche evolution of a continental margin tends, at first approach, to restore a stable slope, the stacking of post-avalanche sedimentation onto unstructured avalanche deposits and over-critical slopes contributes to maintain the local instability of the margin. Short-term effects of instabilities include the tsunami risk, which is studied in order to evaluate the potential hazard on the northern coast of the Raukumara Peninsula. A sedimentological approach, based on the study of sediment cores collected on the Matakaoa margin, allows a stratigraphic analysis of post-avalanche Sediments and enlarges the study upon other processes contributing to sediment transfers towards the deep basin."
In French and English.
GRETA POINT: 551.462.3 COM
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