ISLA Federico Ignacio
Tectonic processes along the South America coastline derived from Quaternary marine terraces
ISLA, F; ANGULO RODOLFO
JOURNAL OF COASTAL RESEARCH
COASTAL EDUCATION & RESEARCH FOUNDATION
Lugar: Florida; Año: 2016 vol. 32 p. 840 - 852
South America is overriding the Nazca, Antarctic and Cocos plates, and at the same time is moving along the Caribbean and Scotia plates. Quaternary highstands of the sea level are ideal benchmarks to estimate tectonic uplifts considering altitude differences along the coast. The Sangamonian highstand, corresponding to the Marine Isotopic Stage 5, is the most helpful indicator for these purposes as it is more easily preserved and spanning a record of 120,000 years. The Mid-Holocene highstand leads to errors assigned to tidal-range variations, estuarine floods, and meteorological effects; however, its maximum altitudes could confirm faster uplifting rates. The major uplifting trends were estimated in relation to the subduction of seismic or aseismic ridges along the Pacific Ocean coast. The Quaternary uplifted terraces of the Atlantic coast at Patagonia were explained by the decreasing uplift induced by the subduction of the Chile Ridge, and related to a very modern volcanic field.