Synsedimentary ash rains and paleoenvironmental conditions during the deposition of the Chachil Formation (Pliensbachian) at its type locality, Neuquén Basin, Argentina
A detailed sedimentological analysis of the so called “Chachil Limestones” at its type locality around the Mirador del Chachil area, southwestern Neuquén province, Argentina, is presented in this paper for the first time. It is based on a macro/microfacial analysis and their environmental interpreta...
| Publicado: |
2016
|
|---|---|
| Materias: | |
| Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_08959811_v71_n_p82_Armella http://hdl.handle.net/20.500.12110/paper_08959811_v71_n_p82_Armella |
| Aporte de: |
| id |
paper:paper_08959811_v71_n_p82_Armella |
|---|---|
| record_format |
dspace |
| spelling |
paper:paper_08959811_v71_n_p82_Armella2023-06-08T15:48:55Z Synsedimentary ash rains and paleoenvironmental conditions during the deposition of the Chachil Formation (Pliensbachian) at its type locality, Neuquén Basin, Argentina Argentina Ash fall Chachil Formation Facies/microfacies analysis Geochronology Lower Jurassic Neuquén Basin Volcaniclastic-carbonate platform carbonate platform deposition depositional environment environmental conditions facies analysis geochronology Jurassic lithostratigraphy microfacies paleoenvironment type locality volcanic ash volcaniclastic deposit Argentina Neuquen Basin A detailed sedimentological analysis of the so called “Chachil Limestones” at its type locality around the Mirador del Chachil area, southwestern Neuquén province, Argentina, is presented in this paper for the first time. It is based on a macro/microfacial analysis and their environmental interpretation by means on texture, fabric, bioclasts, intrabasinal and extrabasinal grain amounts, sedimentary structures, bioturbations and hydro-dynamism. Because of the recognition of different facies associations, but no pure limestones, it is more suitable to refer these sediments as the Chachil Formation. The depositional environment of this unit is interpreted to correspond to an internal platform dominated by tides, with carbonate sedimentation disturbed by repeated explosive volcanic episodes, which reduced the sedimentation space, causing retrogradation of the sedimentary system and coastal onlap. In addition, a new recalibration of the U-Pb zircon dating used for the geochronological analysis reveals a small change with regard to previous information that has been used to recalculate the data, is presented in this paper. © 2016 Elsevier Ltd 2016 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_08959811_v71_n_p82_Armella http://hdl.handle.net/20.500.12110/paper_08959811_v71_n_p82_Armella |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
Argentina Ash fall Chachil Formation Facies/microfacies analysis Geochronology Lower Jurassic Neuquén Basin Volcaniclastic-carbonate platform carbonate platform deposition depositional environment environmental conditions facies analysis geochronology Jurassic lithostratigraphy microfacies paleoenvironment type locality volcanic ash volcaniclastic deposit Argentina Neuquen Basin |
| spellingShingle |
Argentina Ash fall Chachil Formation Facies/microfacies analysis Geochronology Lower Jurassic Neuquén Basin Volcaniclastic-carbonate platform carbonate platform deposition depositional environment environmental conditions facies analysis geochronology Jurassic lithostratigraphy microfacies paleoenvironment type locality volcanic ash volcaniclastic deposit Argentina Neuquen Basin Synsedimentary ash rains and paleoenvironmental conditions during the deposition of the Chachil Formation (Pliensbachian) at its type locality, Neuquén Basin, Argentina |
| topic_facet |
Argentina Ash fall Chachil Formation Facies/microfacies analysis Geochronology Lower Jurassic Neuquén Basin Volcaniclastic-carbonate platform carbonate platform deposition depositional environment environmental conditions facies analysis geochronology Jurassic lithostratigraphy microfacies paleoenvironment type locality volcanic ash volcaniclastic deposit Argentina Neuquen Basin |
| description |
A detailed sedimentological analysis of the so called “Chachil Limestones” at its type locality around the Mirador del Chachil area, southwestern Neuquén province, Argentina, is presented in this paper for the first time. It is based on a macro/microfacial analysis and their environmental interpretation by means on texture, fabric, bioclasts, intrabasinal and extrabasinal grain amounts, sedimentary structures, bioturbations and hydro-dynamism. Because of the recognition of different facies associations, but no pure limestones, it is more suitable to refer these sediments as the Chachil Formation. The depositional environment of this unit is interpreted to correspond to an internal platform dominated by tides, with carbonate sedimentation disturbed by repeated explosive volcanic episodes, which reduced the sedimentation space, causing retrogradation of the sedimentary system and coastal onlap. In addition, a new recalibration of the U-Pb zircon dating used for the geochronological analysis reveals a small change with regard to previous information that has been used to recalculate the data, is presented in this paper. © 2016 Elsevier Ltd |
| title |
Synsedimentary ash rains and paleoenvironmental conditions during the deposition of the Chachil Formation (Pliensbachian) at its type locality, Neuquén Basin, Argentina |
| title_short |
Synsedimentary ash rains and paleoenvironmental conditions during the deposition of the Chachil Formation (Pliensbachian) at its type locality, Neuquén Basin, Argentina |
| title_full |
Synsedimentary ash rains and paleoenvironmental conditions during the deposition of the Chachil Formation (Pliensbachian) at its type locality, Neuquén Basin, Argentina |
| title_fullStr |
Synsedimentary ash rains and paleoenvironmental conditions during the deposition of the Chachil Formation (Pliensbachian) at its type locality, Neuquén Basin, Argentina |
| title_full_unstemmed |
Synsedimentary ash rains and paleoenvironmental conditions during the deposition of the Chachil Formation (Pliensbachian) at its type locality, Neuquén Basin, Argentina |
| title_sort |
synsedimentary ash rains and paleoenvironmental conditions during the deposition of the chachil formation (pliensbachian) at its type locality, neuquén basin, argentina |
| publishDate |
2016 |
| url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_08959811_v71_n_p82_Armella http://hdl.handle.net/20.500.12110/paper_08959811_v71_n_p82_Armella |
| _version_ |
1768543187443384320 |