Relationship between volcanism and marine sedimentation in northern Austral (Aisén) Basin, central Patagonia: Stratigraphic, U-Pb SHRIMP and paleontologic evidence

The northernmost part of the oil-producing Austral Basin, known as Aisén Basin or Río Mayo Embayment (in central Patagonian Cordillera; 43-46°S), is a special area within the basin where the interplay between volcanism and the initial stages of its development can be established. Stratigraphic, pale...

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Autores principales: Suárez, M., De La Cruz, R., Aguirre-Urreta, B., Fanning, M.
Formato: JOUR
Materias:
Austral Basin
Gondwana
Late Jurassic-Early Cretaceous
Patagonia
SHRIMP geochronology
Transgression
Volcanism
geochronology
marine sediment
sedimentation
SHRIMP dating
transgression
uranium-lead dating
volcanism
South America
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_08959811_v27_n4_p309_Suarez
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_08959811_v27_n4_p309_Suarez
record_format dspace
spelling todo:paper_08959811_v27_n4_p309_Suarez2023-10-03T15:42:50Z Relationship between volcanism and marine sedimentation in northern Austral (Aisén) Basin, central Patagonia: Stratigraphic, U-Pb SHRIMP and paleontologic evidence Suárez, M. De La Cruz, R. Aguirre-Urreta, B. Fanning, M. Austral Basin Gondwana Late Jurassic-Early Cretaceous Patagonia SHRIMP geochronology Transgression Volcanism geochronology marine sediment sedimentation SHRIMP dating transgression uranium-lead dating volcanism Austral Basin Patagonia South America The northernmost part of the oil-producing Austral Basin, known as Aisén Basin or Río Mayo Embayment (in central Patagonian Cordillera; 43-46°S), is a special area within the basin where the interplay between volcanism and the initial stages of its development can be established. Stratigraphic, paleontologic and five new U-Pb SHRIMP age determinations presented here indicate that the Aisén Basin was synchronous with the later phases of volcanism of the Ibáñez Formation for at least 11 m.yr. during the Tithonian to early Hauterivian. In this basin marine sedimentary rocks of the basal units of the Coihaique Group accumulated overlying and interfingering with the Ibáñez Formation, which represents the youngest episode of volcanism of a mainly Jurassic acid large igneous province (Chon Aike Province). Five new U-Pb SHRIMP magmatic ages ranging between 140.3 ± 1.0 and 136.1 ± 1.6 Ma (early Valanginian to early Hauterivian) were obtained from the Ibáñez Formation whilst ammonites from the overlying and interfingering Toqui Formation, the basal unit of the Coihaique Group, indicate Tithonian, early Berriasian and late Berriasian ages. The latter was a synvolcanic shallow marine facies accumulated in an intra-arc setting, subsequently developed into a retro-arc basin. © 2008 Elsevier Ltd. All rights reserved. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_08959811_v27_n4_p309_Suarez
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Austral Basin
Gondwana
Late Jurassic-Early Cretaceous
Patagonia
SHRIMP geochronology
Transgression
Volcanism
geochronology
marine sediment
sedimentation
SHRIMP dating
transgression
uranium-lead dating
volcanism
Austral Basin
Patagonia
South America
spellingShingle Austral Basin
Gondwana
Late Jurassic-Early Cretaceous
Patagonia
SHRIMP geochronology
Transgression
Volcanism
geochronology
marine sediment
sedimentation
SHRIMP dating
transgression
uranium-lead dating
volcanism
Austral Basin
Patagonia
South America
Suárez, M.
De La Cruz, R.
Aguirre-Urreta, B.
Fanning, M.
Relationship between volcanism and marine sedimentation in northern Austral (Aisén) Basin, central Patagonia: Stratigraphic, U-Pb SHRIMP and paleontologic evidence
topic_facet Austral Basin
Gondwana
Late Jurassic-Early Cretaceous
Patagonia
SHRIMP geochronology
Transgression
Volcanism
geochronology
marine sediment
sedimentation
SHRIMP dating
transgression
uranium-lead dating
volcanism
Austral Basin
Patagonia
South America
description The northernmost part of the oil-producing Austral Basin, known as Aisén Basin or Río Mayo Embayment (in central Patagonian Cordillera; 43-46°S), is a special area within the basin where the interplay between volcanism and the initial stages of its development can be established. Stratigraphic, paleontologic and five new U-Pb SHRIMP age determinations presented here indicate that the Aisén Basin was synchronous with the later phases of volcanism of the Ibáñez Formation for at least 11 m.yr. during the Tithonian to early Hauterivian. In this basin marine sedimentary rocks of the basal units of the Coihaique Group accumulated overlying and interfingering with the Ibáñez Formation, which represents the youngest episode of volcanism of a mainly Jurassic acid large igneous province (Chon Aike Province). Five new U-Pb SHRIMP magmatic ages ranging between 140.3 ± 1.0 and 136.1 ± 1.6 Ma (early Valanginian to early Hauterivian) were obtained from the Ibáñez Formation whilst ammonites from the overlying and interfingering Toqui Formation, the basal unit of the Coihaique Group, indicate Tithonian, early Berriasian and late Berriasian ages. The latter was a synvolcanic shallow marine facies accumulated in an intra-arc setting, subsequently developed into a retro-arc basin. © 2008 Elsevier Ltd. All rights reserved.
format JOUR
author Suárez, M.
De La Cruz, R.
Aguirre-Urreta, B.
Fanning, M.
author_facet Suárez, M.
De La Cruz, R.
Aguirre-Urreta, B.
Fanning, M.
author_sort Suárez, M.
title Relationship between volcanism and marine sedimentation in northern Austral (Aisén) Basin, central Patagonia: Stratigraphic, U-Pb SHRIMP and paleontologic evidence
title_short Relationship between volcanism and marine sedimentation in northern Austral (Aisén) Basin, central Patagonia: Stratigraphic, U-Pb SHRIMP and paleontologic evidence
title_full Relationship between volcanism and marine sedimentation in northern Austral (Aisén) Basin, central Patagonia: Stratigraphic, U-Pb SHRIMP and paleontologic evidence
title_fullStr Relationship between volcanism and marine sedimentation in northern Austral (Aisén) Basin, central Patagonia: Stratigraphic, U-Pb SHRIMP and paleontologic evidence
title_full_unstemmed Relationship between volcanism and marine sedimentation in northern Austral (Aisén) Basin, central Patagonia: Stratigraphic, U-Pb SHRIMP and paleontologic evidence
title_sort relationship between volcanism and marine sedimentation in northern austral (aisén) basin, central patagonia: stratigraphic, u-pb shrimp and paleontologic evidence
url http://hdl.handle.net/20.500.12110/paper_08959811_v27_n4_p309_Suarez
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