Fluvial origin of the valley system in northern Victoria Land (Antarctica) from quantitative geomorphic analysis.
A network of sinuous valleys with typical dendritic pattern characterizes northern Victoria Land (NVL) in Antarctica. Subparallel to parallel and angular to rectangular patterns are also present. Quantitative geomorphic analysis of the valley network has been carried out utilizing GIS spatial analys...
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ftunivpisairis:oai:arpi.unipi.it:11568/198987 2024-04-21T07:49:20+00:00 Fluvial origin of the valley system in northern Victoria Land (Antarctica) from quantitative geomorphic analysis. BARONI, CARLO SALVATORE, MARIA CRISTINA NOTI V. CICCACCI S. RIGHINI G. Baroni, Carlo Noti, V. Ciccacci, S. Righini, G. Salvatore, MARIA CRISTINA 2005 STAMPA http://hdl.handle.net/11568/198987 https://doi.org/10.1130/B25529.1 eng eng info:eu-repo/semantics/altIdentifier/wos/WOS:000226346000014 volume:117 issue:1-2 firstpage:212 lastpage:228 numberofpages:17 journal:GEOLOGICAL SOCIETY OF AMERICA BULLETIN http://hdl.handle.net/11568/198987 doi:10.1130/B25529.1 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-13344286289 quantitative analysi Landscape evolution Transantarctic Mountain East Antarctica Cenozoic Victoria Land Subglacial geomorphology info:eu-repo/semantics/article 2005 ftunivpisairis https://doi.org/10.1130/B25529.1 2024-03-28T01:27:26Z A network of sinuous valleys with typical dendritic pattern characterizes northern Victoria Land (NVL) in Antarctica. Subparallel to parallel and angular to rectangular patterns are also present. Quantitative geomorphic analysis of the valley network has been carried out utilizing GIS spatial analysis. While drainage densities and drainage frequencies show low values, segments of the NVL valley network are substantially well organized, as indicated by bifurcation ratio (Rb) and direct bifurcation ratio (Rbd) parameters. All basins faithfully adhere to Horton's laws of drainage network composition. Quantitative geomorphic analysis suggests that the valley system can be ascribed to fluvial origin and that consequently, a morphoclimatic system completely different from that of present day must have driven its carving. The resulting data provide indications about the origin of the valley network and this invaluable information can be used for the reconstruction of earlier phases of glacial history and climatic and tectonic evolution of this significant Antarctic region. Fluvial erosion enhanced the denudation of the Transantarctic Mountains from at least 55 Ma to at least the Eocene-Oligocene boundary (ca 34 Ma). Fluvial basins adapted to the tectonic structure, following the main regional fault systems. A well-developed alpine topography postdates the fluvial morphology. Temperate glaciers were responsible for denudation until the Late Miocene. Parasitic glaciers presently mantle the previously sculpted topography. Present-day glacial erosion is negligible and denudation has been exceedingly slow since 7.5 Ma. Article in Journal/Newspaper Antarc* Antarctic Antarctica East Antarctica Victoria Land ARPI - Archivio della Ricerca dell'Università di Pisa Geological Society of America Bulletin 117 1 212 |
institution |
Open Polar |
collection |
ARPI - Archivio della Ricerca dell'Università di Pisa |
op_collection_id |
ftunivpisairis |
language |
English |
topic |
quantitative analysi Landscape evolution Transantarctic Mountain East Antarctica Cenozoic Victoria Land Subglacial geomorphology |
spellingShingle |
quantitative analysi Landscape evolution Transantarctic Mountain East Antarctica Cenozoic Victoria Land Subglacial geomorphology BARONI, CARLO SALVATORE, MARIA CRISTINA NOTI V. CICCACCI S. RIGHINI G. Fluvial origin of the valley system in northern Victoria Land (Antarctica) from quantitative geomorphic analysis. |
topic_facet |
quantitative analysi Landscape evolution Transantarctic Mountain East Antarctica Cenozoic Victoria Land Subglacial geomorphology |
description |
A network of sinuous valleys with typical dendritic pattern characterizes northern Victoria Land (NVL) in Antarctica. Subparallel to parallel and angular to rectangular patterns are also present. Quantitative geomorphic analysis of the valley network has been carried out utilizing GIS spatial analysis. While drainage densities and drainage frequencies show low values, segments of the NVL valley network are substantially well organized, as indicated by bifurcation ratio (Rb) and direct bifurcation ratio (Rbd) parameters. All basins faithfully adhere to Horton's laws of drainage network composition. Quantitative geomorphic analysis suggests that the valley system can be ascribed to fluvial origin and that consequently, a morphoclimatic system completely different from that of present day must have driven its carving. The resulting data provide indications about the origin of the valley network and this invaluable information can be used for the reconstruction of earlier phases of glacial history and climatic and tectonic evolution of this significant Antarctic region. Fluvial erosion enhanced the denudation of the Transantarctic Mountains from at least 55 Ma to at least the Eocene-Oligocene boundary (ca 34 Ma). Fluvial basins adapted to the tectonic structure, following the main regional fault systems. A well-developed alpine topography postdates the fluvial morphology. Temperate glaciers were responsible for denudation until the Late Miocene. Parasitic glaciers presently mantle the previously sculpted topography. Present-day glacial erosion is negligible and denudation has been exceedingly slow since 7.5 Ma. |
author2 |
Baroni, Carlo Noti, V. Ciccacci, S. Righini, G. Salvatore, MARIA CRISTINA |
format |
Article in Journal/Newspaper |
author |
BARONI, CARLO SALVATORE, MARIA CRISTINA NOTI V. CICCACCI S. RIGHINI G. |
author_facet |
BARONI, CARLO SALVATORE, MARIA CRISTINA NOTI V. CICCACCI S. RIGHINI G. |
author_sort |
BARONI, CARLO |
title |
Fluvial origin of the valley system in northern Victoria Land (Antarctica) from quantitative geomorphic analysis. |
title_short |
Fluvial origin of the valley system in northern Victoria Land (Antarctica) from quantitative geomorphic analysis. |
title_full |
Fluvial origin of the valley system in northern Victoria Land (Antarctica) from quantitative geomorphic analysis. |
title_fullStr |
Fluvial origin of the valley system in northern Victoria Land (Antarctica) from quantitative geomorphic analysis. |
title_full_unstemmed |
Fluvial origin of the valley system in northern Victoria Land (Antarctica) from quantitative geomorphic analysis. |
title_sort |
fluvial origin of the valley system in northern victoria land (antarctica) from quantitative geomorphic analysis. |
publishDate |
2005 |
url |
http://hdl.handle.net/11568/198987 https://doi.org/10.1130/B25529.1 |
genre |
Antarc* Antarctic Antarctica East Antarctica Victoria Land |
genre_facet |
Antarc* Antarctic Antarctica East Antarctica Victoria Land |
op_relation |
info:eu-repo/semantics/altIdentifier/wos/WOS:000226346000014 volume:117 issue:1-2 firstpage:212 lastpage:228 numberofpages:17 journal:GEOLOGICAL SOCIETY OF AMERICA BULLETIN http://hdl.handle.net/11568/198987 doi:10.1130/B25529.1 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-13344286289 |
op_doi |
https://doi.org/10.1130/B25529.1 |
container_title |
Geological Society of America Bulletin |
container_volume |
117 |
container_issue |
1 |
container_start_page |
212 |
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1796932188153839616 |