HOLOCENE ALLUVIAL DEPOSITS MEANING IN A SEMI-ARID ENVIRONMENT: A CASE STUDY ON SERTANEJA DEPRESSION (BAHIA STATE/BRAZIL)
Autor(a) principal: | |
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Data de Publicação: | 2019 |
Outros Autores: | |
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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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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1808129337105317888 |