Quaternary fans and colluvium as indicators of environmental change and landscape sensitivity

Quaternary fans and colluvium as indicators of environmental change and landscape sensitivity

dc.contributoren-US
dc.contributorpt-BR
dc.creatorThomas, Michael F
dc.date2002-06-01
dc.date.accessioned2022-12-15T19:49:30Z
dc.date.available2022-12-15T19:49:30Z
dc.identifierhttps://ppegeo.igc.usp.br/index.php/rig/article/view/8888
dc.identifier10.5935/0100-929X.20020001
dc.identifier.urihttps://repositorioslatinoamericanos.uchile.cl/handle/2250/5358814
dc.descriptionUnconsolidated sediments in the humid tropics range from highly altered weathering products involved in minimum, low energy transport, to coarse fans and landslide deposits. But most can be regarded as colluvium and alluvium showing imprints of episodic sedimentation. These deposits may span the entire Cenozoic, but 14C dating has led to a focus on Late Quaternary sediments. Many studies have indicated concentration of activity between the Last Glacial Maximum (LGM) and the early Holocene 'pluvial', but recent use of Optically Stimulated Luminescence (OSL) dating indicates episodic sedimentation throughout the Last Glacial Cycle in some landscapes. The low resolution of most OSL studies limits attempts to construct true event stratigraphies. But, despite this restriction, these sediments record the detailed history of landscape sensitivity to environmental change, and this history includes the effects of continuing weathering and pedogenesis. Bringing together studies of weathering, landscape sensitivity to environmental change, and source-to-sink models of sedimentation, provides a conceptual framework to understand earth surface systems within a Quaternary time frame.en-US
dc.descriptionUnconsolidated sediments in the humid tropics range from highly altered weathering products involved in minimum, low energy transport, to coarse fans and landslide deposits. But most can be regarded as colluvium and alluvium showing imprints of episodic sedimentation. These deposits may span the entire Cenozoic, but 14C dating has led to a focus on Late Quaternary sediments. Many studies have indicated concentration of activity between the Last Glacial Maximum (LGM) and the early Holocene ‘pluvial’, but recent use of Optically Stimulated Luminescence (OSL) dating indicates episodic sedimentation throughout the Last Glacial Cycle in some landscapes. The low resolution of most OSL studies limits attempts to construct true event stratigraphies. But, despite this restriction, these sediments record the detailed history of landscape sensitivity to environmental change, and this history includes the effects of continuing weathering and pedogenesis. Bringing together studies of weathering, landscape sensitivity to environmental change, and source-to-sink models of sedimentation, provides a conceptual framework to understand earth surface systems within a Quaternary time frame.pt-BR
dc.formatapplication/pdf
dc.languageeng
dc.publisherInstituto Geológico, Secretaria do Meio Ambiente, São Paulopt-BR
dc.relationhttps://ppegeo.igc.usp.br/index.php/rig/article/view/8888/8154
dc.rightsDireitos autorais 2002 Revista do Instituto Geológicopt-BR
dc.sourceRevista do Instituto Geológico; v. 23, n. 1 (2002); 1-11en-US
dc.sourceRevista do Instituto Geológico; v. 23, n. 1 (2002); 1-11es-ES
dc.sourceRevista do Instituto Geológico; v. 23, n. 1 (2002); 1-11pt-BR
dc.source2176-1892
dc.source0100-929X
dc.subjectColluvium; Fans; Landscape sensitivity; Quaternary sediments; Sediment sources.en-US
dc.subjectColluvium; Fans; Landscape sensitivity; Quaternary sediments; Sediment sources.pt-BR
dc.titleQuaternary fans and colluvium as indicators of environmental change and landscape sensitivityen-US
dc.titleQuaternary fans and colluvium as indicators of environmental change and landscape sensitivitypt-BR
dc.typeinfo:eu-repo/semantics/article
dc.typeinfo:eu-repo/semantics/publishedVersion
dc.typept-BR


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