Discovery and interpretation of internal unconformities within the Vinchina Formation (Neogene), La Troya creek, La Rioja, Argentina

Two low-angle erosive surfaces (D1 and D2) associated with lithofacies changes and a petrographical break were identified in the middle part of the Neogene Vinchina Formation at its type locality. These surfaces bound three intervals here named P1, P2 and P3. The oldest (P1) rocks, composed of quart...

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Detalles Bibliográficos
Publicado: 2000
Materias:
Foreland basin
Internal unconformities
La Rioja
Neogene
foreland basin
sedimentation
synsedimentary tectonics
unconformity
Argentina
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00044822_v55_n4_p414_Marenssi
http://hdl.handle.net/20.500.12110/paper_00044822_v55_n4_p414_Marenssi
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paper:paper_00044822_v55_n4_p414_Marenssi
record_format dspace
spelling paper:paper_00044822_v55_n4_p414_Marenssi2023-06-08T14:25:29Z Discovery and interpretation of internal unconformities within the Vinchina Formation (Neogene), La Troya creek, La Rioja, Argentina Foreland basin Internal unconformities La Rioja Neogene foreland basin Neogene sedimentation synsedimentary tectonics unconformity Argentina Two low-angle erosive surfaces (D1 and D2) associated with lithofacies changes and a petrographical break were identified in the middle part of the Neogene Vinchina Formation at its type locality. These surfaces bound three intervals here named P1, P2 and P3. The oldest (P1) rocks, composed of quartz-rich lithic feldsarenites (with Lm/Lv=0.5), were deposited by anastomosing rivers. These rocks were tilted by 9° to the SW and erosional D1 was formed before deposition of P2 strata. The middle interval (P2) consists of lithic feldsarenites (Lm/Lv=0.2) deposited by gravelly braided rivers. The whole sequence was tilted 4° to the NE and developing D2 unconformity before deposition of P3 strata. The younger interval (P3) comprises quartz-poor feldspathic litharenites (with Lm/Lv=0.2) originated in sandy braided rivers. Finally, the entire Vinchina Formation was tilted 56° to the NW. Synsedimentary tectonic activity is strongly suggested by the geometric relationships and petrographic changes observed among P1, P2 and P3 intervals. 2000 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00044822_v55_n4_p414_Marenssi http://hdl.handle.net/20.500.12110/paper_00044822_v55_n4_p414_Marenssi
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Foreland basin
Internal unconformities
La Rioja
Neogene
foreland basin
Neogene
sedimentation
synsedimentary tectonics
unconformity
Argentina
spellingShingle Foreland basin
Internal unconformities
La Rioja
Neogene
foreland basin
Neogene
sedimentation
synsedimentary tectonics
unconformity
Argentina
Discovery and interpretation of internal unconformities within the Vinchina Formation (Neogene), La Troya creek, La Rioja, Argentina
topic_facet Foreland basin
Internal unconformities
La Rioja
Neogene
foreland basin
Neogene
sedimentation
synsedimentary tectonics
unconformity
Argentina
description Two low-angle erosive surfaces (D1 and D2) associated with lithofacies changes and a petrographical break were identified in the middle part of the Neogene Vinchina Formation at its type locality. These surfaces bound three intervals here named P1, P2 and P3. The oldest (P1) rocks, composed of quartz-rich lithic feldsarenites (with Lm/Lv=0.5), were deposited by anastomosing rivers. These rocks were tilted by 9° to the SW and erosional D1 was formed before deposition of P2 strata. The middle interval (P2) consists of lithic feldsarenites (Lm/Lv=0.2) deposited by gravelly braided rivers. The whole sequence was tilted 4° to the NE and developing D2 unconformity before deposition of P3 strata. The younger interval (P3) comprises quartz-poor feldspathic litharenites (with Lm/Lv=0.2) originated in sandy braided rivers. Finally, the entire Vinchina Formation was tilted 56° to the NW. Synsedimentary tectonic activity is strongly suggested by the geometric relationships and petrographic changes observed among P1, P2 and P3 intervals.
title Discovery and interpretation of internal unconformities within the Vinchina Formation (Neogene), La Troya creek, La Rioja, Argentina
title_short Discovery and interpretation of internal unconformities within the Vinchina Formation (Neogene), La Troya creek, La Rioja, Argentina
title_full Discovery and interpretation of internal unconformities within the Vinchina Formation (Neogene), La Troya creek, La Rioja, Argentina
title_fullStr Discovery and interpretation of internal unconformities within the Vinchina Formation (Neogene), La Troya creek, La Rioja, Argentina
title_full_unstemmed Discovery and interpretation of internal unconformities within the Vinchina Formation (Neogene), La Troya creek, La Rioja, Argentina
title_sort discovery and interpretation of internal unconformities within the vinchina formation (neogene), la troya creek, la rioja, argentina
publishDate 2000
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00044822_v55_n4_p414_Marenssi
http://hdl.handle.net/20.500.12110/paper_00044822_v55_n4_p414_Marenssi
_version_ 1768543970776842240

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