The tectonic significance of K/Ar illite fine-fraction ages from the San Luis Formation (Eastern Sierras Pampeanas, Argentina)

The Sierra de San Luis forms the southern tip of the Eastern Sierras Pampeanas in central Argentina. Two narrow belts of low-grade phyllites and quartz arenites, i. e. the San Luis Formation, have accommodated part of the strain-related differential exhumation of the medium- to high-grade metamorphi...

Descripción completa

Guardado en:
Detalles Bibliográficos
Autores principales: Wemmer, K., Steenken, A., Müller, S., de Luchi, M.G.L., Siegesmund, S.
Formato: JOUR
Materias:
Eastern Sierras Pampeanas
Illite fine fractions
K/Ar
Paganzo Basin
San Luis Formation
age determination
exhumation
illite
metamorphism
orogeny
potassium-argon dating
subsidence
tectonic setting
tectonic structure
uplift
Argentina
San Luis
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_14373254_v100_n2_p659_Wemmer
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_14373254_v100_n2_p659_Wemmer
record_format dspace
spelling todo:paper_14373254_v100_n2_p659_Wemmer2023-10-03T16:15:58Z The tectonic significance of K/Ar illite fine-fraction ages from the San Luis Formation (Eastern Sierras Pampeanas, Argentina) Wemmer, K. Steenken, A. Müller, S. de Luchi, M.G.L. Siegesmund, S. Eastern Sierras Pampeanas Illite fine fractions K/Ar Paganzo Basin San Luis Formation age determination exhumation illite metamorphism orogeny potassium-argon dating subsidence tectonic setting tectonic structure uplift Argentina Paganzo Basin San Luis The Sierra de San Luis forms the southern tip of the Eastern Sierras Pampeanas in central Argentina. Two narrow belts of low-grade phyllites and quartz arenites, i. e. the San Luis Formation, have accommodated part of the strain-related differential exhumation of the medium- to high-grade metamorphic domains that constitute to the basement complex of the sierra. Eleven phyllite samples were subjected to the K/Ar fine-fraction dating technique. Results are interpreted in relation to the Kübler index of the illites, which indicate epimetamorphic conditions for the majority of the samples. Obtained ages between 330 and 290 Ma cover a period of compressional tectonics in the late Mississippian (Visean/Serpukhovian boundary) followed by the subsidence during the formation of the Paganzo Basin in the provinces of La Rioja and San Luis. These tectonic movements are coincident with the Toco orogeny in northern Chile and southern Bolivia. This suggests that the older K/Ar ages document the compressional stage and that younger ages record the cooling of the basement during the subsequent extensional uplift of the basement. © 2011 The Author(s). JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_14373254_v100_n2_p659_Wemmer
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Eastern Sierras Pampeanas
Illite fine fractions
K/Ar
Paganzo Basin
San Luis Formation
age determination
exhumation
illite
metamorphism
orogeny
potassium-argon dating
subsidence
tectonic setting
tectonic structure
uplift
Argentina
Paganzo Basin
San Luis
spellingShingle Eastern Sierras Pampeanas
Illite fine fractions
K/Ar
Paganzo Basin
San Luis Formation
age determination
exhumation
illite
metamorphism
orogeny
potassium-argon dating
subsidence
tectonic setting
tectonic structure
uplift
Argentina
Paganzo Basin
San Luis
Wemmer, K.
Steenken, A.
Müller, S.
de Luchi, M.G.L.
Siegesmund, S.
The tectonic significance of K/Ar illite fine-fraction ages from the San Luis Formation (Eastern Sierras Pampeanas, Argentina)
topic_facet Eastern Sierras Pampeanas
Illite fine fractions
K/Ar
Paganzo Basin
San Luis Formation
age determination
exhumation
illite
metamorphism
orogeny
potassium-argon dating
subsidence
tectonic setting
tectonic structure
uplift
Argentina
Paganzo Basin
San Luis
description The Sierra de San Luis forms the southern tip of the Eastern Sierras Pampeanas in central Argentina. Two narrow belts of low-grade phyllites and quartz arenites, i. e. the San Luis Formation, have accommodated part of the strain-related differential exhumation of the medium- to high-grade metamorphic domains that constitute to the basement complex of the sierra. Eleven phyllite samples were subjected to the K/Ar fine-fraction dating technique. Results are interpreted in relation to the Kübler index of the illites, which indicate epimetamorphic conditions for the majority of the samples. Obtained ages between 330 and 290 Ma cover a period of compressional tectonics in the late Mississippian (Visean/Serpukhovian boundary) followed by the subsidence during the formation of the Paganzo Basin in the provinces of La Rioja and San Luis. These tectonic movements are coincident with the Toco orogeny in northern Chile and southern Bolivia. This suggests that the older K/Ar ages document the compressional stage and that younger ages record the cooling of the basement during the subsequent extensional uplift of the basement. © 2011 The Author(s).
format JOUR
author Wemmer, K.
Steenken, A.
Müller, S.
de Luchi, M.G.L.
Siegesmund, S.
author_facet Wemmer, K.
Steenken, A.
Müller, S.
de Luchi, M.G.L.
Siegesmund, S.
author_sort Wemmer, K.
title The tectonic significance of K/Ar illite fine-fraction ages from the San Luis Formation (Eastern Sierras Pampeanas, Argentina)
title_short The tectonic significance of K/Ar illite fine-fraction ages from the San Luis Formation (Eastern Sierras Pampeanas, Argentina)
title_full The tectonic significance of K/Ar illite fine-fraction ages from the San Luis Formation (Eastern Sierras Pampeanas, Argentina)
title_fullStr The tectonic significance of K/Ar illite fine-fraction ages from the San Luis Formation (Eastern Sierras Pampeanas, Argentina)
title_full_unstemmed The tectonic significance of K/Ar illite fine-fraction ages from the San Luis Formation (Eastern Sierras Pampeanas, Argentina)
title_sort tectonic significance of k/ar illite fine-fraction ages from the san luis formation (eastern sierras pampeanas, argentina)
url http://hdl.handle.net/20.500.12110/paper_14373254_v100_n2_p659_Wemmer
work_keys_str_mv AT wemmerk thetectonicsignificanceofkarillitefinefractionagesfromthesanluisformationeasternsierraspampeanasargentina
AT steenkena thetectonicsignificanceofkarillitefinefractionagesfromthesanluisformationeasternsierraspampeanasargentina
AT mullers thetectonicsignificanceofkarillitefinefractionagesfromthesanluisformationeasternsierraspampeanasargentina
AT deluchimgl thetectonicsignificanceofkarillitefinefractionagesfromthesanluisformationeasternsierraspampeanasargentina
AT siegesmunds thetectonicsignificanceofkarillitefinefractionagesfromthesanluisformationeasternsierraspampeanasargentina
AT wemmerk tectonicsignificanceofkarillitefinefractionagesfromthesanluisformationeasternsierraspampeanasargentina
AT steenkena tectonicsignificanceofkarillitefinefractionagesfromthesanluisformationeasternsierraspampeanasargentina
AT mullers tectonicsignificanceofkarillitefinefractionagesfromthesanluisformationeasternsierraspampeanasargentina
AT deluchimgl tectonicsignificanceofkarillitefinefractionagesfromthesanluisformationeasternsierraspampeanasargentina
AT siegesmunds tectonicsignificanceofkarillitefinefractionagesfromthesanluisformationeasternsierraspampeanasargentina
_version_ 1782030764659965952

Ejemplares similares