Análisis Sedimentológico y geomorfológico de áreas lacustres en la Península Fildes, Isla Rey Jorge, Antártica Marítima

Geomorphological features and sedimentary characteristics are analized from five sets of shallow sediment cores collected in lakes in the Fildes Peninsula, King George Island. The geomorphology of the area was observed and sediments samples were obtained at field activities during the XXXI Brazilian...

Full description

Bibliographic Details
Published in:Investigaciones Geográficas
Main Authors: Rosemary Vieira, Humberto Marotta, Kátia Kellem da Rosa, Ricardo Jaña, Carolina Lorenz Simões, Enoil de Souza Júnior, Fabrício Ferreira, Liliane Ronquette Santos, João Victor dos Santos, Marcos Aurélio Perroni, Matheus Gonçalves, João Pedro Farias Santos, Raphael Issa Rodrigues, Janaína Cynthia Medeiros Galvão, João Paulo de Sá Felizardo
Format: Article in Journal/Newspaper
Language:English
Spanish
Portuguese
Published: Universidad de Chile, Departamento de Geografía 2015
Subjects:
Physical geography
GB3-5030
Geography (General)
G1-922
Antarctic
King George Island
Fildes
Fildes peninsula
Rey Jorge
Isla Rey Jorge
península Fildes
Antarc*
Antarctica
Antártica
Online Access:https://doi.org/10.5354/0719-5370.2015.37511
https://doaj.org/article/aa2769d993204cfd98c3faa0a1a42a64
Description
Summary:Geomorphological features and sedimentary characteristics are analized from five sets of shallow sediment cores collected in lakes in the Fildes Peninsula, King George Island. The geomorphology of the area was observed and sediments samples were obtained at field activities during the XXXI Brazilian Antarctic Operation (March-April/2013). Biogeochemical characteristics, physical parameters, mineralogical composition, particle size distribution, macroscopic characteristics of the sediments and satellite images were analized. Preliminary results indicate climatic and environmental changes in north-south transect of the peninsula. The mineralogical composition is associated with geological structure of the area, where basaltic rocks predominate. The particle size variation reflects different sediment source environments. Macroscopic analysis and mineralogical composition variation reflect the action of weathering along the peninsula. The sediments also have potential mineralization and subsequent release of greenhouse gases. A preliminary map of the classification of the lakes is presented. In addition, it was identified that wetland sediment presents methane production rates (CH4) about 40 times larger and more sensitive to the effect of global warming compared to lake sediment. Subpolar aquatic ecosystems sediments from Maritime Antarctica can be a preferential site for the effects of climate variability.

Similar Items