Push moraines in the upper valley of Santa Cruz river,southwest Argentina. Structural analysis and relationship with Late Pleistocene paleoclimate |
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| Institution: | 1. Instituto de Estudios Andinos Don Pablo Groeber (IDEAN), UBA-CONICET, Intendente Güiraldes 2160, Ciudad Universitaria – Pabellón II, C1428EGA – CABA, Argentina;2. Departamento de Ciencias Geológicas, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Argentina;3. Senior Structural Geology Consultant, (1115) M. de Azcuénaga 1370 8 A, Buenos Aires, Argentina;1. Universidade Federal do Estado do Rio de Janeiro, Departamento de Ciências Naturais, Av. Pasteur, 458, Sala 406, Urca, Rio de Janeiro, RJ CEP 22290-040, Brazil;2. Universidade Federal de São Carlos, Departamento de Ecologia e Biologia Evolutiva, Via Washington Luis, Km 235, CP 676, São Carlos, SP CEP 13565-905, Brazil;1. University of California Museum of Paleontology and Department of Integrative Biology, University of California-Berkeley, 1101 Valley Life Sciences Bldg., Berkeley, CA 94720, USA;2. Departamento de Arqueología, Escuela de Hotelería y Turismo, y Museo Paleontologico Megaterio, Universidad Estatal Península de Santa Elena, La Libertad, Santa Elena, Ecuador;1. Departamento de Física, Universidade Federal da Paraíba, Joao Pessoa, PB, 58051-970, Brazil;2. Instituto de Pesquisas Energéticas e Nucleares, CNEN-IPEN, São Paulo, 05508-000, Brazil;3. CCEA, Universidade Estadual da Paraíba, Patos, PB, 58706-560, Brazil;4. Programa de Pós-Graduação Em Engenharia Física, Unidade Acadêmica Do Cabo de Santo Agostinho, Universidade Federal Rural de Pernambuco, Cabo de Santo Agostinho, PE, 54518-430, Brazil;1. Università di Roma TRE, Roma, Italy;2. Istituto Nazionale di Geofisica e Vulcanologia, Roma, Italy;3. Corporación Geológica ARES, Bogota, Colombia;4. Instituto Colombiano del Petróleo, Ecopetrol-ICP, Bucaramanga, Colombia;1. Instituto de Geociências, Universidade Federal do Rio Grande do Sul, Av. Bento Gonçalves, 9500, Porto Alegre, RS CEP 91501-970, Brazil;2. Companhia de Pesquisa de Recursos Minerais, São Paulo, Rua Costa, 55, SP CEP 01304-010, Brazil;3. Instituto de Geociências, Universidade de Brasília, Campus Universitário Darcy Ribeiro, Brasília, DF CEP 70904-970, Brazil;1. Centro de Investigaciones Geológicas, Universidad Nacional de La Plata-CONICET, calle 1Nº 644 (1900) La Plata, Argentina;2. Cátedras de Sedimentología y Rocas sedimentarias, Universidad Nacional de La Plata, calle 60 y 122 s/n, La Plata, Argentina |
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| Abstract: | The upper cliff of the Santa Cruz River was used to assess the proglacial environments of the Argentino Glacier outlet of Late Pleistocene age. These cliffs show glaciolacustrine, fluvioglacial and till deposits, where only the first one are deformed. Glacial landforms in the area and these structures suggest that the ice mass advanced, topographically controlled, towards the east from the Patagonian Ice Sheet pushing up the proglacial sediments.The spatial arrangement of thrusts and overturned folds, the drumlins-flutes moraine directions and the end moraines shape, allow inferring the dynamic and the Argentino glacier profile. Detailed analyses of the glaciotectonic structures indicate that these have two origins: load in the north with stress transfer to the southeast, and push from the west. Through the analysis of deformed sediments, their thickness and their sedimentary and structural features, three zones of deformations were recognized. Each of these zones was associated to glacial advances because of changes of the regional climate conditions. |
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| Keywords: | Push moraines Glacial landforms Last Glaciation Santa Cruz river Southern Patagonia Argentina |
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