40Ar/39Ar and U-Pb SHRIMP dating of Aptian tuff cones in the Aisén Basin, Central Patagonian Cordillera

M. Suárez; A. Demant; R. De La Cruz; C. M. Fanning

doi:10.1016/j.jsames.2009.11.003

40Ar/39Ar and U-Pb SHRIMP dating of Aptian tuff cones in the Aisén Basin, Central Patagonian Cordillera

M. Suárez^*, A. Demant, R. De La Cruz, C. M. Fanning

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

18 Citations (Scopus)

Abstract

Surtseyan tuff cones of the Baño Nuevo Volcanic Complex erupted in shallow marine water during the waning stage of the Aisén Basin, the northern part of the Austral Basin of the Central Patagonian Cordillera. This volcanic complex was emplaced within the Hauterivian to early Aptian Apeleg Formation, the youngest sedimentary unit of this basin, whilst the sediments were still wet. Three new Ar/Ar dates (amphibole) and one U-Pb SHRIMP date (zircon) from this complex yielded concordant early Aptian ages of 122-121. Ma. These data agree with the contact relationships between the Apeleg Formation and the tuff cones. These dates also agree with those of early Aptian ammonites collected from the Apeleg Formation 100. km south of the study area, which represent the youngest fossils identified in this unit. Aptian to Albian subaerial volcanic rocks of the Divisadero Group, paraconformably overlie the Apeleg Formation. The emplacement of the Baño Nuevo Volcanic Complex pre-dates the disappearance of the Aisén Basin.

Original language	English
Pages (from-to)	731-737
Number of pages	7
Journal	Journal of South American Earth Sciences
Volume	29
Issue number	3
DOIs	https://doi.org/10.1016/j.jsames.2009.11.003
Publication status	Published - Apr 2010

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10.1016/j.jsames.2009.11.003

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title = "40Ar/39Ar and U-Pb SHRIMP dating of Aptian tuff cones in the Ais{\'e}n Basin, Central Patagonian Cordillera",

abstract = "Surtseyan tuff cones of the Ba{\~n}o Nuevo Volcanic Complex erupted in shallow marine water during the waning stage of the Ais{\'e}n Basin, the northern part of the Austral Basin of the Central Patagonian Cordillera. This volcanic complex was emplaced within the Hauterivian to early Aptian Apeleg Formation, the youngest sedimentary unit of this basin, whilst the sediments were still wet. Three new Ar/Ar dates (amphibole) and one U-Pb SHRIMP date (zircon) from this complex yielded concordant early Aptian ages of 122-121. Ma. These data agree with the contact relationships between the Apeleg Formation and the tuff cones. These dates also agree with those of early Aptian ammonites collected from the Apeleg Formation 100. km south of the study area, which represent the youngest fossils identified in this unit. Aptian to Albian subaerial volcanic rocks of the Divisadero Group, paraconformably overlie the Apeleg Formation. The emplacement of the Ba{\~n}o Nuevo Volcanic Complex pre-dates the disappearance of the Ais{\'e}n Basin.",

keywords = "Ais{\'e}n Basin, Aptian, Ar/Ar, Central Patagonia, Chile, Shrimp",

author = "M. Su{\'a}rez and A. Demant and Cruz, {R. De La} and Fanning, {C. M.}",

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doi = "10.1016/j.jsames.2009.11.003",

language = "English",

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journal = "Journal of South American Earth Sciences",

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AU - Suárez, M.

AU - Demant, A.

AU - Cruz, R. De La

AU - Fanning, C. M.

PY - 2010/4

Y1 - 2010/4

N2 - Surtseyan tuff cones of the Baño Nuevo Volcanic Complex erupted in shallow marine water during the waning stage of the Aisén Basin, the northern part of the Austral Basin of the Central Patagonian Cordillera. This volcanic complex was emplaced within the Hauterivian to early Aptian Apeleg Formation, the youngest sedimentary unit of this basin, whilst the sediments were still wet. Three new Ar/Ar dates (amphibole) and one U-Pb SHRIMP date (zircon) from this complex yielded concordant early Aptian ages of 122-121. Ma. These data agree with the contact relationships between the Apeleg Formation and the tuff cones. These dates also agree with those of early Aptian ammonites collected from the Apeleg Formation 100. km south of the study area, which represent the youngest fossils identified in this unit. Aptian to Albian subaerial volcanic rocks of the Divisadero Group, paraconformably overlie the Apeleg Formation. The emplacement of the Baño Nuevo Volcanic Complex pre-dates the disappearance of the Aisén Basin.

AB - Surtseyan tuff cones of the Baño Nuevo Volcanic Complex erupted in shallow marine water during the waning stage of the Aisén Basin, the northern part of the Austral Basin of the Central Patagonian Cordillera. This volcanic complex was emplaced within the Hauterivian to early Aptian Apeleg Formation, the youngest sedimentary unit of this basin, whilst the sediments were still wet. Three new Ar/Ar dates (amphibole) and one U-Pb SHRIMP date (zircon) from this complex yielded concordant early Aptian ages of 122-121. Ma. These data agree with the contact relationships between the Apeleg Formation and the tuff cones. These dates also agree with those of early Aptian ammonites collected from the Apeleg Formation 100. km south of the study area, which represent the youngest fossils identified in this unit. Aptian to Albian subaerial volcanic rocks of the Divisadero Group, paraconformably overlie the Apeleg Formation. The emplacement of the Baño Nuevo Volcanic Complex pre-dates the disappearance of the Aisén Basin.

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KW - Aptian

KW - Ar/Ar

KW - Central Patagonia

KW - Chile

KW - Shrimp

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DO - 10.1016/j.jsames.2009.11.003

M3 - Article

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JF - Journal of South American Earth Sciences

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ER -

40Ar/39Ar and U-Pb SHRIMP dating of Aptian tuff cones in the Aisén Basin, Central Patagonian Cordillera

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