Tertiary succesion of the Los Pozuelos creek (Vinchina Basin): Its stratigraphic and paleogeographic importance for the Andean foreland

The description and interpretation of a thick Tertiary sedimentary succession cropping out along the Los Pozuelos creek, northern part of the Vinchina basin is presented here. The sedimentary column was divided into eight stratigraphic sections (SE), including the Vallecito Formation (SE1, aeolian;...

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Detalles Bibliográficos
Publicado: 2013
Materias:
Andean orogeny
Broken-foreland
La Rioja
Stratigraphy
braided river
depocenter
eolian deposit
fluvial deposit
foreland basin
lithostratigraphy
Miocene
orogeny
paleogeography
sedimentary sequence
stratigraphic correlation
Tertiary
transpression
uplift
Andes
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00044822_v70_n4_p451_Ciccioli
http://hdl.handle.net/20.500.12110/paper_00044822_v70_n4_p451_Ciccioli
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paper:paper_00044822_v70_n4_p451_Ciccioli
record_format dspace
spelling paper:paper_00044822_v70_n4_p451_Ciccioli2023-06-08T14:26:41Z Tertiary succesion of the Los Pozuelos creek (Vinchina Basin): Its stratigraphic and paleogeographic importance for the Andean foreland Andean orogeny Broken-foreland La Rioja Stratigraphy braided river depocenter eolian deposit fluvial deposit foreland basin lithostratigraphy Miocene orogeny paleogeography sedimentary sequence stratigraphic correlation Tertiary transpression uplift Andes The description and interpretation of a thick Tertiary sedimentary succession cropping out along the Los Pozuelos creek, northern part of the Vinchina basin is presented here. The sedimentary column was divided into eight stratigraphic sections (SE), including the Vallecito Formation (SE1, aeolian; SE2, fluvial-aeolian interaction), the lower member of the Vinchina Formation (SE3, ephemeral sandy fluvial systems; SE4, braided to anastomosed fluvial systems), the upper member of the Vinchina Formation (SE5 and SE6, amalgamated sandy-gravel braided and high sinuosity fluvial systems) and the lower member of the Toro Negro Formation (SE7, confined gravelly to sandy braid plain; SE8, gravelly to sandy anastomosing fluvial systems). The unconformity between the Vallecito and Vinchina formations represents a major change in the evolution of the Andean foreland basin. SE3 and SE4 deposits (early transpressive retroarc stage) are continuous and homogeneous along strike, while SE5 and SE6 deposits (late transpressive retroarc stage) are not; indicating that uplifted basement blocks partitioned the foreland into isolated depocenters (broken-foreland basin). Rocks belonging to SE7 and SE8 show the complex relationship between the fold and thrust belt and the basement blocks. Facies changes and decreasing grain-size in a North to South direction recorded in the upper member of the Vinchina Formation when comparing the northern exposures (Los Pozuelos creek) and the central section along the La Troya River indicate that the Toro Negro Range acted as a local positive element since the early Miocene. 2013 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00044822_v70_n4_p451_Ciccioli http://hdl.handle.net/20.500.12110/paper_00044822_v70_n4_p451_Ciccioli
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Andean orogeny
Broken-foreland
La Rioja
Stratigraphy
braided river
depocenter
eolian deposit
fluvial deposit
foreland basin
lithostratigraphy
Miocene
orogeny
paleogeography
sedimentary sequence
stratigraphic correlation
Tertiary
transpression
uplift
Andes
spellingShingle Andean orogeny
Broken-foreland
La Rioja
Stratigraphy
braided river
depocenter
eolian deposit
fluvial deposit
foreland basin
lithostratigraphy
Miocene
orogeny
paleogeography
sedimentary sequence
stratigraphic correlation
Tertiary
transpression
uplift
Andes
Tertiary succesion of the Los Pozuelos creek (Vinchina Basin): Its stratigraphic and paleogeographic importance for the Andean foreland
topic_facet Andean orogeny
Broken-foreland
La Rioja
Stratigraphy
braided river
depocenter
eolian deposit
fluvial deposit
foreland basin
lithostratigraphy
Miocene
orogeny
paleogeography
sedimentary sequence
stratigraphic correlation
Tertiary
transpression
uplift
Andes
description The description and interpretation of a thick Tertiary sedimentary succession cropping out along the Los Pozuelos creek, northern part of the Vinchina basin is presented here. The sedimentary column was divided into eight stratigraphic sections (SE), including the Vallecito Formation (SE1, aeolian; SE2, fluvial-aeolian interaction), the lower member of the Vinchina Formation (SE3, ephemeral sandy fluvial systems; SE4, braided to anastomosed fluvial systems), the upper member of the Vinchina Formation (SE5 and SE6, amalgamated sandy-gravel braided and high sinuosity fluvial systems) and the lower member of the Toro Negro Formation (SE7, confined gravelly to sandy braid plain; SE8, gravelly to sandy anastomosing fluvial systems). The unconformity between the Vallecito and Vinchina formations represents a major change in the evolution of the Andean foreland basin. SE3 and SE4 deposits (early transpressive retroarc stage) are continuous and homogeneous along strike, while SE5 and SE6 deposits (late transpressive retroarc stage) are not; indicating that uplifted basement blocks partitioned the foreland into isolated depocenters (broken-foreland basin). Rocks belonging to SE7 and SE8 show the complex relationship between the fold and thrust belt and the basement blocks. Facies changes and decreasing grain-size in a North to South direction recorded in the upper member of the Vinchina Formation when comparing the northern exposures (Los Pozuelos creek) and the central section along the La Troya River indicate that the Toro Negro Range acted as a local positive element since the early Miocene.
title Tertiary succesion of the Los Pozuelos creek (Vinchina Basin): Its stratigraphic and paleogeographic importance for the Andean foreland
title_short Tertiary succesion of the Los Pozuelos creek (Vinchina Basin): Its stratigraphic and paleogeographic importance for the Andean foreland
title_full Tertiary succesion of the Los Pozuelos creek (Vinchina Basin): Its stratigraphic and paleogeographic importance for the Andean foreland
title_fullStr Tertiary succesion of the Los Pozuelos creek (Vinchina Basin): Its stratigraphic and paleogeographic importance for the Andean foreland
title_full_unstemmed Tertiary succesion of the Los Pozuelos creek (Vinchina Basin): Its stratigraphic and paleogeographic importance for the Andean foreland
title_sort tertiary succesion of the los pozuelos creek (vinchina basin): its stratigraphic and paleogeographic importance for the andean foreland
publishDate 2013
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00044822_v70_n4_p451_Ciccioli
http://hdl.handle.net/20.500.12110/paper_00044822_v70_n4_p451_Ciccioli
_version_ 1768545905586208768

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