HOLOCENE ALLUVIAL DEPOSITS MEANING IN A SEMI-ARID ENVIRONMENT: A CASE STUDY ON SERTANEJA DEPRESSION (BAHIA STATE/BRAZIL)

Detalhes bibliográficos
Autor(a) principal: Lima, Kleber Carvalho [UNESP]
Data de Publicação: 2019
Outros Autores: Lupinacci, Cenira Maria [UNESP]
Tipo de documento: Artigo
Idioma: por
Título da fonte: Repositório Institucional da UNESP
Texto Completo: http://dx.doi.org/10.20502/rbg.v20i4.1660
http://hdl.handle.net/11449/196306
Resumo: Ephemeral drainage basins and their alluvial deposits may have characteristics that contribute to the understanding of Holocene time-scale climate dynamics. Although widely studied in semiarid contexts of different countries, their paleoclimatic significance is still poorly understood in Brazil. In this research, we analyzed the characteristics of alluvial deposits in two small drainage basins, located in the southern semi-arid, central-north sector of the Sertaneja Depression - State of Bahia/Brazil. Our purpose also included interpreting the Holocene climatic conditions that contributed to the processes of alluvial deposit formation. We performed the geomorphological mapping, allostratigraphic layers identification on field trip, Particle Size Distribution (PSD) analysis, sediment morphology analysis, and Optically Stimulated Luminescence (OSL) dating. Alluvial deposits showed characteristics associated with crystalline rocks and ephemeral streams such as [i] spatial discontinuity along the drainage channel; [ii] depositional architecture indicative of bedding lateral migration and laminar flows; [iii] predominance of gravel and coarse sand, poorly sorted and; [iv] statistical parameters that suggest past episodes flows. The depositional events occurred in the Middle Holocene - Upper Holocene transition, between 4.4 kyr - 3.5 kyr B.P. and between 1.1 kyr B.P. to the present. These deposits have relations with dry climatic conditions established in the last 4 kyr.
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spelling HOLOCENE ALLUVIAL DEPOSITS MEANING IN A SEMI-ARID ENVIRONMENT: A CASE STUDY ON SERTANEJA DEPRESSION (BAHIA STATE/BRAZIL)Fluvial GeomorphologyFloodplainsEphemeral FlowsHoloceneOsl DatingEphemeral drainage basins and their alluvial deposits may have characteristics that contribute to the understanding of Holocene time-scale climate dynamics. Although widely studied in semiarid contexts of different countries, their paleoclimatic significance is still poorly understood in Brazil. In this research, we analyzed the characteristics of alluvial deposits in two small drainage basins, located in the southern semi-arid, central-north sector of the Sertaneja Depression - State of Bahia/Brazil. Our purpose also included interpreting the Holocene climatic conditions that contributed to the processes of alluvial deposit formation. We performed the geomorphological mapping, allostratigraphic layers identification on field trip, Particle Size Distribution (PSD) analysis, sediment morphology analysis, and Optically Stimulated Luminescence (OSL) dating. Alluvial deposits showed characteristics associated with crystalline rocks and ephemeral streams such as [i] spatial discontinuity along the drainage channel; [ii] depositional architecture indicative of bedding lateral migration and laminar flows; [iii] predominance of gravel and coarse sand, poorly sorted and; [iv] statistical parameters that suggest past episodes flows. The depositional events occurred in the Middle Holocene - Upper Holocene transition, between 4.4 kyr - 3.5 kyr B.P. and between 1.1 kyr B.P. to the present. These deposits have relations with dry climatic conditions established in the last 4 kyr.Univ Estadual Julio Mesquita Filho, Dept Geog, Av 24 A,1515, BR-13506900 Rio Claro, SP, BrazilUniv Estadual Julio Mesquita Filho, Dept Planejamento Terr & Geoproc, Av 24 A,1515, BR-13506900 Rio Claro, SP, BrazilUniv Estadual Julio Mesquita Filho, Dept Geog, Av 24 A,1515, BR-13506900 Rio Claro, SP, BrazilUniv Estadual Julio Mesquita Filho, Dept Planejamento Terr & Geoproc, Av 24 A,1515, BR-13506900 Rio Claro, SP, BrazilUniao Geomorfologia BrasileiraUniversidade Estadual Paulista (Unesp)Lima, Kleber Carvalho [UNESP]Lupinacci, Cenira Maria [UNESP]2020-12-10T19:40:24Z2020-12-10T19:40:24Z2019-10-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article841-860http://dx.doi.org/10.20502/rbg.v20i4.1660Revista Brasileira De Geomorfologia. Uberlandia, Brazil: Uniao Geomorfologia Brasileira, v. 20, n. 4, p. 841-860, 2019.1519-1540http://hdl.handle.net/11449/19630610.20502/rbg.v20i4.1660WOS:00049495570001026898213239421990000-0002-4732-1421Web of Sciencereponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPporRevista Brasileira De Geomorfologiainfo:eu-repo/semantics/openAccess2021-10-23T07:00:38Zoai:repositorio.unesp.br:11449/196306Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462024-08-05T21:34:18.783197Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false
dc.title.none.fl_str_mv HOLOCENE ALLUVIAL DEPOSITS MEANING IN A SEMI-ARID ENVIRONMENT: A CASE STUDY ON SERTANEJA DEPRESSION (BAHIA STATE/BRAZIL)
title HOLOCENE ALLUVIAL DEPOSITS MEANING IN A SEMI-ARID ENVIRONMENT: A CASE STUDY ON SERTANEJA DEPRESSION (BAHIA STATE/BRAZIL)
spellingShingle HOLOCENE ALLUVIAL DEPOSITS MEANING IN A SEMI-ARID ENVIRONMENT: A CASE STUDY ON SERTANEJA DEPRESSION (BAHIA STATE/BRAZIL)
Lima, Kleber Carvalho [UNESP]
Fluvial Geomorphology
Floodplains
Ephemeral Flows
Holocene
Osl Dating
title_short HOLOCENE ALLUVIAL DEPOSITS MEANING IN A SEMI-ARID ENVIRONMENT: A CASE STUDY ON SERTANEJA DEPRESSION (BAHIA STATE/BRAZIL)
title_full HOLOCENE ALLUVIAL DEPOSITS MEANING IN A SEMI-ARID ENVIRONMENT: A CASE STUDY ON SERTANEJA DEPRESSION (BAHIA STATE/BRAZIL)
title_fullStr HOLOCENE ALLUVIAL DEPOSITS MEANING IN A SEMI-ARID ENVIRONMENT: A CASE STUDY ON SERTANEJA DEPRESSION (BAHIA STATE/BRAZIL)
title_full_unstemmed HOLOCENE ALLUVIAL DEPOSITS MEANING IN A SEMI-ARID ENVIRONMENT: A CASE STUDY ON SERTANEJA DEPRESSION (BAHIA STATE/BRAZIL)
title_sort HOLOCENE ALLUVIAL DEPOSITS MEANING IN A SEMI-ARID ENVIRONMENT: A CASE STUDY ON SERTANEJA DEPRESSION (BAHIA STATE/BRAZIL)
author Lima, Kleber Carvalho [UNESP]
author_facet Lima, Kleber Carvalho [UNESP]
Lupinacci, Cenira Maria [UNESP]
author_role author
author2 Lupinacci, Cenira Maria [UNESP]
author2_role author
dc.contributor.none.fl_str_mv Universidade Estadual Paulista (Unesp)
dc.contributor.author.fl_str_mv Lima, Kleber Carvalho [UNESP]
Lupinacci, Cenira Maria [UNESP]
dc.subject.por.fl_str_mv Fluvial Geomorphology
Floodplains
Ephemeral Flows
Holocene
Osl Dating
topic Fluvial Geomorphology
Floodplains
Ephemeral Flows
Holocene
Osl Dating
description Ephemeral drainage basins and their alluvial deposits may have characteristics that contribute to the understanding of Holocene time-scale climate dynamics. Although widely studied in semiarid contexts of different countries, their paleoclimatic significance is still poorly understood in Brazil. In this research, we analyzed the characteristics of alluvial deposits in two small drainage basins, located in the southern semi-arid, central-north sector of the Sertaneja Depression - State of Bahia/Brazil. Our purpose also included interpreting the Holocene climatic conditions that contributed to the processes of alluvial deposit formation. We performed the geomorphological mapping, allostratigraphic layers identification on field trip, Particle Size Distribution (PSD) analysis, sediment morphology analysis, and Optically Stimulated Luminescence (OSL) dating. Alluvial deposits showed characteristics associated with crystalline rocks and ephemeral streams such as [i] spatial discontinuity along the drainage channel; [ii] depositional architecture indicative of bedding lateral migration and laminar flows; [iii] predominance of gravel and coarse sand, poorly sorted and; [iv] statistical parameters that suggest past episodes flows. The depositional events occurred in the Middle Holocene - Upper Holocene transition, between 4.4 kyr - 3.5 kyr B.P. and between 1.1 kyr B.P. to the present. These deposits have relations with dry climatic conditions established in the last 4 kyr.
publishDate 2019
dc.date.none.fl_str_mv 2019-10-01
2020-12-10T19:40:24Z
2020-12-10T19:40:24Z
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://dx.doi.org/10.20502/rbg.v20i4.1660
Revista Brasileira De Geomorfologia. Uberlandia, Brazil: Uniao Geomorfologia Brasileira, v. 20, n. 4, p. 841-860, 2019.
1519-1540
http://hdl.handle.net/11449/196306
10.20502/rbg.v20i4.1660
WOS:000494955700010
2689821323942199
0000-0002-4732-1421
url http://dx.doi.org/10.20502/rbg.v20i4.1660
http://hdl.handle.net/11449/196306
identifier_str_mv Revista Brasileira De Geomorfologia. Uberlandia, Brazil: Uniao Geomorfologia Brasileira, v. 20, n. 4, p. 841-860, 2019.
1519-1540
10.20502/rbg.v20i4.1660
WOS:000494955700010
2689821323942199
0000-0002-4732-1421
dc.language.iso.fl_str_mv por
language por
dc.relation.none.fl_str_mv Revista Brasileira De Geomorfologia
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv 841-860
dc.publisher.none.fl_str_mv Uniao Geomorfologia Brasileira
publisher.none.fl_str_mv Uniao Geomorfologia Brasileira
dc.source.none.fl_str_mv Web of Science
reponame:Repositório Institucional da UNESP
instname:Universidade Estadual Paulista (UNESP)
instacron:UNESP
instname_str Universidade Estadual Paulista (UNESP)
instacron_str UNESP
institution UNESP
reponame_str Repositório Institucional da UNESP
collection Repositório Institucional da UNESP
repository.name.fl_str_mv Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)
repository.mail.fl_str_mv
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