Biofacies analysis of Hettangian-Sinemurian bivalve/brachiopod associations from the Neuquén Basin (Argentina)
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| Format: | Artículo científico |
| Language: | en |
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Universitat de Barcelona
2005
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| _version_ | 1876452628864434176 |
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| author | S.E. Damborenea |
| author_facet | S.E. Damborenea |
| contents | Biofacies analysis of Hettangian-Sinemurian bivalve/brachiopod associations from the Neuquén Basin (Argentina) S.E. Damborenea M.O. Manceñido Ciencias de la Tierra Bivalvia Hettangian Sinemurian Brachiopoda Palaeoecology Based upon extensive sampling with strict stratigraphical control on Hettangian and Sinemurian deposits croppingout at the river Atuel region (southwest Mendoza Province), the presence of all bivalve and brachiopodgenera was recorded. Data gathered from the analysed interval were processed by multivariate analysis and theresulting Q-mode dendrogram was used to discriminate five associations (i.e. Entolium-limoids, Pholadomya-Pinna-Pleuromya, Weyla-Gryphaea, Lywea and Cardinioides). These are not in simple stratigraphical successionbut are recurrent, reflecting palaeosynecological and biofacies influences. The palaeoenvironmental implicationsof these associations are analysed, as well as their geographical and stratigraphical distributions in thestudied sections (Arroyo Malo, El Pedrero and Las Chilcas). The Cardinioides association is controlled bypalaeosalinity and corresponds to a paralic/estuarine environment, of restricted geographical and stratigraphicaldistribution, whereas the remaining associations correspond to normal marine shelf to littoral environments.The Lywea association is interpreted as allochthonous and probably an impoverished subset derived from thediverse Weyla-Gryphaea association. On the basis of the palaeoautecological characteristics of the taxainvolved in terms of guilds represented in these benthonic associations, it is concluded that most of the associationswere dominated by the epifauna, whereas in the Pholadomya-Pinna-Pleuromya association the infaunaand semi-infauna were particularly conspicuous and diverse, and the Cardinioides association was characterizedby shallow infauna. Typical basinal biofacies from deeper, off-shore environments, and fresh-water biofacies,are both missing. 2005 artículo científico 1695-6133 https://www.redalyc.org/articulo.oa?id=50530208 en http://www.redalyc.org/revista.oa?id=505 Geologica Acta: an international earth science journal application/pdf Universitat de Barcelona Geologica Acta: an international earth science journal (España) Num.2 Vol.3 |
| format | Artículo científico |
| id | redalyc_50530208 |
| institution | Redalyc |
| language | en |
| publishDate | 2005 |
| publisher | Universitat de Barcelona |
| spellingShingle | Biofacies analysis of Hettangian-Sinemurian bivalve/brachiopod associations from the Neuquén Basin (Argentina) S.E. Damborenea Ciencias de la Tierra Bivalvia Hettangian Sinemurian Brachiopoda Palaeoecology Biofacies analysis of Hettangian-Sinemurian bivalve/brachiopod associations from the Neuquén Basin (Argentina) S.E. Damborenea M.O. Manceñido Ciencias de la Tierra Bivalvia Hettangian Sinemurian Brachiopoda Palaeoecology Based upon extensive sampling with strict stratigraphical control on Hettangian and Sinemurian deposits croppingout at the river Atuel region (southwest Mendoza Province), the presence of all bivalve and brachiopodgenera was recorded. Data gathered from the analysed interval were processed by multivariate analysis and theresulting Q-mode dendrogram was used to discriminate five associations (i.e. Entolium-limoids, Pholadomya-Pinna-Pleuromya, Weyla-Gryphaea, Lywea and Cardinioides). These are not in simple stratigraphical successionbut are recurrent, reflecting palaeosynecological and biofacies influences. The palaeoenvironmental implicationsof these associations are analysed, as well as their geographical and stratigraphical distributions in thestudied sections (Arroyo Malo, El Pedrero and Las Chilcas). The Cardinioides association is controlled bypalaeosalinity and corresponds to a paralic/estuarine environment, of restricted geographical and stratigraphicaldistribution, whereas the remaining associations correspond to normal marine shelf to littoral environments.The Lywea association is interpreted as allochthonous and probably an impoverished subset derived from thediverse Weyla-Gryphaea association. On the basis of the palaeoautecological characteristics of the taxainvolved in terms of guilds represented in these benthonic associations, it is concluded that most of the associationswere dominated by the epifauna, whereas in the Pholadomya-Pinna-Pleuromya association the infaunaand semi-infauna were particularly conspicuous and diverse, and the Cardinioides association was characterizedby shallow infauna. Typical basinal biofacies from deeper, off-shore environments, and fresh-water biofacies,are both missing. 2005 artículo científico 1695-6133 https://www.redalyc.org/articulo.oa?id=50530208 en http://www.redalyc.org/revista.oa?id=505 Geologica Acta: an international earth science journal application/pdf Universitat de Barcelona Geologica Acta: an international earth science journal (España) Num.2 Vol.3 |
| title | Biofacies analysis of Hettangian-Sinemurian bivalve/brachiopod associations from the Neuquén Basin (Argentina) |
| topic | Ciencias de la Tierra Bivalvia Hettangian Sinemurian Brachiopoda Palaeoecology |
| url | https://www.redalyc.org/articulo.oa?id=50530208 |