Universidad de ConcepciónSociedad Chilena de Ciencias del Mar


E2.4-ESEG Structure and Geodynamic Evolution

The Andean Cordillera, as an archetype of orogenic belts build on ocean-continent subduction zones, is the center of sessions proposed to this Thematic Area. These sessions should deal with the internal structure and temporal evolution of the Andean margin from a geodynamic perspective, with emphasis on processes dominating the pre-Andean (pre-Jurassic) and Andean (Jurassic-Recent) orogenic cycles. We expect session proposals integrating geologic and geophysical data to analyze the tectonic force balance behind the present-day Andean belt, as well as the tectono-stratigraphic and structural evolution of the different orogenic cycles and their geodynamic context.

Plenary Speaker: Dr. Susan Beck, University of Arizona, United States View Profile

ESEG-GS: General Session Structure and Geodynamic Evolution

Convenors: Marcelo Farías, Andrés Tassara.

Description: This session will receive abstracts related to Structure and Geodynamic Evolution that cannot be included in one of the specific sessions of this thematic area.

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ESEG-1: Andean Tectonics

Convenors: Andrés Folguera, Andrés Tassara, Andrés Echaurren.

Description: This session postdates similar meetings at recent Symposia and Congresses in both Chile and Argentina and in the first ATECSUD meeting held in Santiago de Chile in 2016. This session will gather works that present scientific results related to the tectonic and geodynamic evolution of the Andean margin through the Andean cycle (Jurassic-Present) and previous tectonic cycles (Paleozoic-Triassic). This session will allow integrating information from both Andean slopes associated with the mechanics of deformation, timing, relation to magmatism, development and closure of sedimentary basins, orogenic development, etc.

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ESEG-2: Tectonoestratigraphy of the Mesozoic Andean basins

Convenors: Pablo Rossel, Esteban Salazar, Maximiliano Naipauer, Verónica Oliveros.

Description: The Andean paleogeographic evolution during Mesozoic was characterized by a bimodal hypsometry with large basins located both in the margin and in the interior of the continent. Diverse tectonic environments have been proposed for those basins, so all of them as a whole, represent a unique record of the tectonic, paleogeographic and paleontologic evolution of the Andes during Mesozoic. These basins are major structural features of the early Andes, host large hydrocarbons reservoirs and a unique paleontological record for the southern cone, and show variations throughout the margin that have not completely understood yet, as well as the control of these variations on the segmentation of the response to deformation. In this session, it is expected to receive works that contribute to the understanding of the origin and evolution of these Mesozoic basins, integrating stratigraphical, sedimentological, structural, geophysical and sediment provenance data.

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ESEG-3: Crustal architecture of the Andean margin combining structural data and geophysical models

Convenors: Andrés Tassara, Laura Giambiagi, Lolita Campos.

Description: Knowledge about the internal structure of the Andean Cordillera is fundamental for understanding the relationship between surface geological units and deep processes building the orogen, and its extrapolation to other subduction zones. The integration of structural works with high-resolution geophysical images has allowed over the last decade the proposition of a wide range of conceptual models about the orogenic structure at different latitudes of the Andes, some of them contradictory one to each other. This session welcomes contributions that present and discuss 2D and 3D models of the internal architecture of the current Andean crust as derived from the analysis of structural sections at regional to continental scales, geophysical images and models (seismic, gravimetric, magnetotelurics, thermomechanic, etc) and the integration of these datasets into numerical models explaining the construction of the Andean orogen. Also welcomed will be abstracts comparing the Andean structure with other convergent margins, particularly with the Central America subduction zone.

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ESEG-4: Tectonic evolution of the Scotia arc in Southamerica and Antarctic Peninsula

Convenors: Mauricio Calderón, Julie Fosdick, Matias Ghiglione.

Description: The idea of the symposium is the analysis of the tectonic evolution of the Southernmost Andes and the Scotia Sea. The Southernmost Andes comprise the southern bent of the Andean mountains, where they progressively change their strike from the N-S–oriented Southern Patagonian Andes to the E-W–trending Fuegian Andes. These Andean segments and their corresponding basement, sedimentary basins, magmatic rocks and batholithic belts are linked, even if sometimes elusively, to the evolution of the islands spread in the southern ocean. There is a joint history of Antarctica and South America that was shattered by the opening of the Scotia Sea. The remaining pieces of the puzzle, how can they fit together, and how were they separated from each other will be one of the main discussion topics of the symposium.

The organizers are Earth Sciences researchers that have worked on the geological and geophysical exploration of the region for over the last two decades, on a number of multidisciplinary subjects in the region. Multiple points of views and methods are therefore presented to address update summaries of new and long lasting debates, including the complex evolution of the Rocas Verdes marginal basin and the Patagonian Batholith, and the Magallanes-Austral foreland basin.

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