Resumen
Very little work has been done on the stratigraphy and sedimentology of the upper Oligocene-Lower Miocene Río Baguales Formation in the Magallanes Province of southern Chile since its original definition in 1957. A detailed stratigraphic section of the upper part of the formation exposed west of the Baguales River is presented, with an interpretation of depositional environments. This indicates a prograding shoreline in which estuary mouth, middle estuary (lagoon) and bay head delta facies are represented. Large-scale delta slope foresets indicate progradation towards the north and northwest, whereas southeast-directed cross-beds on the delta front probably suggest wave action. The general sequence reflects a gradual sea-level fall largely counteracted by tectonic subsidence, which provided the ne- cessary accommodation space for thick tidal flat and subtidal deposits to accumulate. A longer period of transgression towards the top of the succession may be related to a rise in sea-level or accelerated tectonic subsidence, whereas a major regression commencing at around 23.3 Ma probably coincides with the opening of the Drake Passage and the growth of the East Antarctic Ice Sheet.
| Idioma original | Spanish |
|---|---|
| Páginas (desde-hasta) | 329-344 |
| Número de páginas | 16 |
| Publicación | Andean Geology |
| Volumen | 37 |
| N.º | 2 |
| Estado | Published - 1 dic 2010 |
Huella dactilar
ASJC Scopus subject areas
- Geology
- Geochemistry and Petrology
- Stratigraphy
- Palaeontology
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Depósitos estuarinos en la Formación Río Baguales (Chattiano-Aquitaniano), Provincia de Magalla- nes, Chile. / le Roux, Jacobus P.; Puratich, Jacqueline; Amaro Mourgues, F.; Oyarzún, José Luis; Otero, Rodrigo A.; Torres, Teresa; Hervé, Francisco.
En: Andean Geology, Vol. 37, N.º 2, 01.12.2010, p. 329-344.Resultado de la investigación: Article
TY - JOUR
T1 - Depósitos estuarinos en la Formación Río Baguales (Chattiano-Aquitaniano), Provincia de Magalla- nes, Chile
AU - le Roux, Jacobus P.
AU - Puratich, Jacqueline
AU - Amaro Mourgues, F.
AU - Oyarzún, José Luis
AU - Otero, Rodrigo A.
AU - Torres, Teresa
AU - Hervé, Francisco
PY - 2010/12/1
Y1 - 2010/12/1
N2 - Very little work has been done on the stratigraphy and sedimentology of the upper Oligocene-Lower Miocene Río Baguales Formation in the Magallanes Province of southern Chile since its original definition in 1957. A detailed stratigraphic section of the upper part of the formation exposed west of the Baguales River is presented, with an interpretation of depositional environments. This indicates a prograding shoreline in which estuary mouth, middle estuary (lagoon) and bay head delta facies are represented. Large-scale delta slope foresets indicate progradation towards the north and northwest, whereas southeast-directed cross-beds on the delta front probably suggest wave action. The general sequence reflects a gradual sea-level fall largely counteracted by tectonic subsidence, which provided the ne- cessary accommodation space for thick tidal flat and subtidal deposits to accumulate. A longer period of transgression towards the top of the succession may be related to a rise in sea-level or accelerated tectonic subsidence, whereas a major regression commencing at around 23.3 Ma probably coincides with the opening of the Drake Passage and the growth of the East Antarctic Ice Sheet.
AB - Very little work has been done on the stratigraphy and sedimentology of the upper Oligocene-Lower Miocene Río Baguales Formation in the Magallanes Province of southern Chile since its original definition in 1957. A detailed stratigraphic section of the upper part of the formation exposed west of the Baguales River is presented, with an interpretation of depositional environments. This indicates a prograding shoreline in which estuary mouth, middle estuary (lagoon) and bay head delta facies are represented. Large-scale delta slope foresets indicate progradation towards the north and northwest, whereas southeast-directed cross-beds on the delta front probably suggest wave action. The general sequence reflects a gradual sea-level fall largely counteracted by tectonic subsidence, which provided the ne- cessary accommodation space for thick tidal flat and subtidal deposits to accumulate. A longer period of transgression towards the top of the succession may be related to a rise in sea-level or accelerated tectonic subsidence, whereas a major regression commencing at around 23.3 Ma probably coincides with the opening of the Drake Passage and the growth of the East Antarctic Ice Sheet.
KW - Estuary
KW - Gilbert-type delta
KW - Oligocene-Miocene sea-level changes
KW - Polykladichnus
UR - http://www.scopus.com/inward/record.url?scp=79955700287&partnerID=8YFLogxK
M3 - Article
AN - SCOPUS:79955700287
VL - 37
SP - 329
EP - 344
JO - Andean Geology
JF - Andean Geology
SN - 0718-7092
IS - 2
ER -