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

M. Suárez, R. De La Cruz, B. Aguirre-Urreta, M. Fanning

Resultado de la investigación: Article

14 Citas (Scopus)

Resumen

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.

Idioma originalEnglish
Páginas (desde-hasta)309-325
Número de páginas17
PublicaciónJournal of South American Earth Sciences
Volumen27
N.º4
DOI
EstadoPublished - 1 abr 2009

Huella dactilar

volcanism
sedimentation
basin
Hauterivian
Berriasian
Tithonian
large igneous province
Valanginian
age determination
cordillera
sedimentary rock
Jurassic
oil
acid

ASJC Scopus subject areas

  • Geology
  • Earth-Surface Processes

Citar esto

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title = "Relationship between volcanism and marine sedimentation in northern Austral (Ais{\'e}n) Basin, central Patagonia: Stratigraphic, U-Pb SHRIMP and paleontologic evidence",
abstract = "The northernmost part of the oil-producing Austral Basin, known as Ais{\'e}n Basin or R{\'i}o 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 Ais{\'e}n Basin was synchronous with the later phases of volcanism of the Ib{\'a}{\~n}ez 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 Ib{\'a}{\~n}ez 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 Ib{\'a}{\~n}ez 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.",
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author = "M. Su{\'a}rez and {De La Cruz}, R. and B. Aguirre-Urreta and M. Fanning",
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TY - JOUR

T1 - Relationship between volcanism and marine sedimentation in northern Austral (Aisén) Basin, central Patagonia

T2 - Stratigraphic, U-Pb SHRIMP and paleontologic evidence

AU - Suárez, M.

AU - De La Cruz, R.

AU - Aguirre-Urreta, B.

AU - Fanning, M.

PY - 2009/4/1

Y1 - 2009/4/1

N2 - 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.

AB - 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.

KW - Austral Basin

KW - Gondwana

KW - Late Jurassic-Early Cretaceous

KW - Patagonia

KW - SHRIMP geochronology

KW - Transgression

KW - Volcanism

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U2 - 10.1016/j.jsames.2008.11.009

DO - 10.1016/j.jsames.2008.11.009

M3 - Article

AN - SCOPUS:67349275368

VL - 27

SP - 309

EP - 325

JO - Journal of South American Earth Sciences

JF - Journal of South American Earth Sciences

SN - 0895-9811

IS - 4

ER -