USAP-DC

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Collaborative Research: Late Cretaceous - Early Tertiary Plate Interactions in the Southwest Pacific Start Date: 1994-04-15 End Date: 1998-03-31 Description/Abstract 9317872 Cande This award supports a marine geophysical study of the southwest Pacific between 170 degrees E and 80 degrees W longitude. Recent marine geophysical cruises in the southwest Pacific and a high-resolution altimetric gravity field declassified Geosat data have allowed significant progress to be made towards deciphering the complex history of the rifting between the Campbell Plateau/Chatham Rise landmass and the Marie Byrd Land margin. A revised history of plate interactions explains many enigmatic features seen in the magnetic and gravity fields yet several questions remain that require new data for resolution. The marine geophysical survey proposed will: (1) elucidate plate interactions at the evolving triple junction between the Antarctic and Australian plates and the mosaic of SW Pacific plates; (2) define the boundaries and interactions of the mosaic of plates that accommodated the rapidly changing plate geometry associated with subduction of the Pacific-Phoenix ridge outboard of New Zealand, the rifting of continental and oceanic lithosphere, and hotspot activity; and (3) map the development of Pacific-Antarctic Ridge and the assembly of the several small plates into the modern day Pacific plate. This survey will help to elucidate the dynamics of plate interactions and the plate tectonic evolution of Antarctica and New Zealand. *** Personnel Person Role Cande, Steven Investigator Funding Antarctic Earth Sciences Award # 9317872 AMD - DIF Record(s) NBP9602 Data Management Plan None in the Database Product Level: Not provided Datasets Repository Title (link) Format(s) Status R2R Expedition Data None exist Platforms and Instruments GRAVIMETERS MSBS R/V NBP