Early to Middle Holocene transition in the Pastos Chicos record, dry Puna of Argentina

Mostrar todas las versiones(2)

This paper presents a multi-proxy record and its paleoenvironmental interpretation from Pastos Chicos (23° 40' 29″ S; 66° 25' 32″ W; 3781masl), Susques, Jujuy province, Argentina. The analysis includes a study of fluvial sediments and geomorphology, and the contained diatoms and pollen rec...

Descripción completa

Guardado en:
Detalles Bibliográficos
Autores principales: Tchilinguirian, P., Morales, M.R., Oxman, B., Lupo, L.C., Olivera, D.E., Yacobaccio, H.D.
Formato: JOUR
Materias:
accuracy assessment
alluvial deposit
catchment
diatom
environmental change
floodplain
fossil record
Holocene
meander
paleoenvironment
palynology
steppe
water table
Argentina
Jujuy
Puna
Bacillariophyta
Poaceae
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_10406182_v330_n1_p171_Tchilinguirian
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_10406182_v330_n1_p171_Tchilinguirian
record_format dspace
spelling todo:paper_10406182_v330_n1_p171_Tchilinguirian2023-10-03T15:57:58Z Early to Middle Holocene transition in the Pastos Chicos record, dry Puna of Argentina Tchilinguirian, P. Morales, M.R. Oxman, B. Lupo, L.C. Olivera, D.E. Yacobaccio, H.D. accuracy assessment alluvial deposit catchment diatom environmental change floodplain fossil record Holocene meander paleoenvironment palynology steppe water table Argentina Jujuy Puna Bacillariophyta Poaceae This paper presents a multi-proxy record and its paleoenvironmental interpretation from Pastos Chicos (23° 40' 29″ S; 66° 25' 32″ W; 3781masl), Susques, Jujuy province, Argentina. The analysis includes a study of fluvial sediments and geomorphology, and the contained diatoms and pollen record at centenary resolution. Two main environmental phases characterize the ~9000-4200BP interval. The first phase was a humid period between ~9000 and 7300BP (circa 10,000-8100cal.BP) which showed organic soils formation in a floodplain broadly vegetated by grasses with a high and stable water table level. The second phase developed between 7300 and 6000BP (~8100-6800cal.BP) and showed a moderately drier environment interrupted by punctuated humid events such as those around 7000 and 6300BP. This environment could be interpreted as a permanently existing meandering river with a floodplain with shallow oxbow lakes, bordered by a diverse shrub steppe. After 6000BP, the fluvial system turned into a braided river situated in a sandy floodplain with dunes and ephemeral ponds. At the end of the sequence (i.e. post ~4200BP), salt crusts developed and the river lowered its base level by 8m. These results seem to show that the Pastos Chicos river basin evolved from low energy and more humid conditions established during the Early and the first part of the Middle Holocene, to drier ones in a system with more energy during some events of the second part of the latter period. The start of this aridization process at ~6000BP in the basin, seems to be substantially later than other observations in local records of the Andean area. This could be due to physiographic control of the moisture by the catchment area (~1000km 2 ) that generates a catchment-averaged regional scale signal of smaller amplitude, which is delayed for individual tributaries. These studies, with other ongoing analysis, will improve the accuracy of the models of resource structure in the area in several space-time scales and, consequently, advance knowledge concerning the organizational pattern of human societies in the past. © 2012 Elsevier Ltd and INQUA. Fil:Tchilinguirian, P. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_10406182_v330_n1_p171_Tchilinguirian
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic accuracy assessment
alluvial deposit
catchment
diatom
environmental change
floodplain
fossil record
Holocene
meander
paleoenvironment
palynology
steppe
water table
Argentina
Jujuy
Puna
Bacillariophyta
Poaceae
spellingShingle accuracy assessment
alluvial deposit
catchment
diatom
environmental change
floodplain
fossil record
Holocene
meander
paleoenvironment
palynology
steppe
water table
Argentina
Jujuy
Puna
Bacillariophyta
Poaceae
Tchilinguirian, P.
Morales, M.R.
Oxman, B.
Lupo, L.C.
Olivera, D.E.
Yacobaccio, H.D.
Early to Middle Holocene transition in the Pastos Chicos record, dry Puna of Argentina
topic_facet accuracy assessment
alluvial deposit
catchment
diatom
environmental change
floodplain
fossil record
Holocene
meander
paleoenvironment
palynology
steppe
water table
Argentina
Jujuy
Puna
Bacillariophyta
Poaceae
description This paper presents a multi-proxy record and its paleoenvironmental interpretation from Pastos Chicos (23° 40' 29″ S; 66° 25' 32″ W; 3781masl), Susques, Jujuy province, Argentina. The analysis includes a study of fluvial sediments and geomorphology, and the contained diatoms and pollen record at centenary resolution. Two main environmental phases characterize the ~9000-4200BP interval. The first phase was a humid period between ~9000 and 7300BP (circa 10,000-8100cal.BP) which showed organic soils formation in a floodplain broadly vegetated by grasses with a high and stable water table level. The second phase developed between 7300 and 6000BP (~8100-6800cal.BP) and showed a moderately drier environment interrupted by punctuated humid events such as those around 7000 and 6300BP. This environment could be interpreted as a permanently existing meandering river with a floodplain with shallow oxbow lakes, bordered by a diverse shrub steppe. After 6000BP, the fluvial system turned into a braided river situated in a sandy floodplain with dunes and ephemeral ponds. At the end of the sequence (i.e. post ~4200BP), salt crusts developed and the river lowered its base level by 8m. These results seem to show that the Pastos Chicos river basin evolved from low energy and more humid conditions established during the Early and the first part of the Middle Holocene, to drier ones in a system with more energy during some events of the second part of the latter period. The start of this aridization process at ~6000BP in the basin, seems to be substantially later than other observations in local records of the Andean area. This could be due to physiographic control of the moisture by the catchment area (~1000km 2 ) that generates a catchment-averaged regional scale signal of smaller amplitude, which is delayed for individual tributaries. These studies, with other ongoing analysis, will improve the accuracy of the models of resource structure in the area in several space-time scales and, consequently, advance knowledge concerning the organizational pattern of human societies in the past. © 2012 Elsevier Ltd and INQUA.
format JOUR
author Tchilinguirian, P.
Morales, M.R.
Oxman, B.
Lupo, L.C.
Olivera, D.E.
Yacobaccio, H.D.
author_facet Tchilinguirian, P.
Morales, M.R.
Oxman, B.
Lupo, L.C.
Olivera, D.E.
Yacobaccio, H.D.
author_sort Tchilinguirian, P.
title Early to Middle Holocene transition in the Pastos Chicos record, dry Puna of Argentina
title_short Early to Middle Holocene transition in the Pastos Chicos record, dry Puna of Argentina
title_full Early to Middle Holocene transition in the Pastos Chicos record, dry Puna of Argentina
title_fullStr Early to Middle Holocene transition in the Pastos Chicos record, dry Puna of Argentina
title_full_unstemmed Early to Middle Holocene transition in the Pastos Chicos record, dry Puna of Argentina
title_sort early to middle holocene transition in the pastos chicos record, dry puna of argentina
url http://hdl.handle.net/20.500.12110/paper_10406182_v330_n1_p171_Tchilinguirian
work_keys_str_mv AT tchilinguirianp earlytomiddleholocenetransitioninthepastoschicosrecorddrypunaofargentina
AT moralesmr earlytomiddleholocenetransitioninthepastoschicosrecorddrypunaofargentina
AT oxmanb earlytomiddleholocenetransitioninthepastoschicosrecorddrypunaofargentina
AT lupolc earlytomiddleholocenetransitioninthepastoschicosrecorddrypunaofargentina
AT oliverade earlytomiddleholocenetransitioninthepastoschicosrecorddrypunaofargentina
AT yacobacciohd earlytomiddleholocenetransitioninthepastoschicosrecorddrypunaofargentina
_version_ 1807322058464428032

Ejemplares similares