Seismic facies investigation and late Quaternary glacial history of the Chilean shelf and fjords and Antarctic Peninsula fjords
DaSilva, Jana Lee
Anderson, John B.
Master of Arts
High-resolution seismic data collected in inland waters Chile and the Antarctic Peninsula (41$\sp\circ$S-65$\sp\circ$S) were interpreted using seismic facies analysis. Piston cores provide some lithologic control on the interpretation of the seismic data. These data span a latitudinal transect that encompasses temperate, subpolar and polar climatic regimes, and these regimes are characterized by differences in seismic facies. In the present climatic regime, northern and central Chile fall into a temperate climate regime and the Antarctic Peninsula falls into a subpolar/polar climate regime. A sub-temperate facies transition encompasses the South Shetland Islands and southern Chilean fjord region. The data were used to compile maps that show seismic facies distribution patterns and these maps are the basis for glacial reconstructions that span the present interglacial to the Last Glacial Maximum (LGM). The maps show the extent of northward shift in climatic settings during the Last Glacial Maximum.