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dc.contributor.author
Milana, Juan Pablo
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dc.contributor.author
Di Pasquo, Mercedes
dc.date.available
2020-03-02T19:01:02Z
dc.date.issued
2019-12
dc.identifier.citation
Milana, Juan Pablo; Di Pasquo, Mercedes; New chronostratigraphy for a lower to upper Carboniferous strike-slip basin of W-Precordillera (Argentina): Paleogeographic, tectonic and glacial importance; Pergamon-Elsevier Science Ltd; Journal of South American Earth Sciences; 96; 12-2019; 1-24
dc.identifier.issn
0895-9811
dc.identifier.uri
http://hdl.handle.net/11336/98648
dc.description.abstract
New biostratigraphic ages and the stratigraphic revision of a c. 4 km thick succession of Lower and Upper Carboniferous beds, exposed in the Del Salto creek, in the western Precordillera (San Juan, Argentina) are presented. Detailed mapping and analysis of the vertical and lateral variations of the sedimentary systems of the three units we are redefining here (El Planchón, Churupatí and Del Salto formations) allowed us to modify many pre-existing concepts. The palynological data provided for the El Planchón Formation corroborate it is not Devonian but Carboniferous, (mid-late Visean), since it conformably overlies the Del Ratón Formation (Early Visean). A distal glacial interval in El Planchón lower member, distal turbidites and hemipelagites in the middle member and non-glacial shallow-water heterolithics with small slumps and proximal turbidites for the upper member are interpreted. An angular unconformity defines the base of the alluvial conglomeratic Churupatí Formation (redefined herein), that shows dramatic lateral variations from a dominantly alluvial conglomeratic sequence to the north (green- purple conglomerates) and sandier fluvial to swampy sequences to the south. Chrupati palynological content suggests its late Visean – early Serpukhovian age. A new erosive unconformity separates Churupatí from Del Salto formations with an interpreted glacial origin, while the palynological content of basal Del Salto Fm indicates a Pennsylvanian (Bashkirian) age, not Permian. A dextral strike-slip basin is interpreted to explain this Carboniferous succession, based on geological, stratigraphical and sedimentological data. Evidence supporting this interpretation are: (1) its thickness (c. 4 Km) in a restricted geographical place as no traces of these units are found east or westwards except for Del Salto formation equivalents. (2) the amount of active-tectonically fed gravel, important lateral changes, and fast transitions to from gravel-to mud-dominated sequences, (3) the southward displacement of the entry-point from hinterland of coarse sediment observed between Churupatí and Del Salto formations, (4) the partial rotation of local structures, (5) its coincidence with the modern dextral Del Tigre fault. The entire sequence supports the existence of three main glacial episodes and does not support the existence of the Protoprecordillera, but a surrounding hummocky positive terrain that did not obstruct the drainage systems moving sediment eastwards.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Pergamon-Elsevier Science Ltd
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dc.rights
info:eu-repo/semantics/restrictedAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-nd/2.5/ar/
dc.subject
ARGENTINA
dc.subject
CARBONIFEROUS
dc.subject
GLACIATION
dc.subject
LPIA
dc.subject
PRECORDILLERA
dc.subject
STRIKE-SLIP
dc.subject.classification
Geociencias multidisciplinaria
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dc.subject.classification
Ciencias de la Tierra y relacionadas con el Medio Ambiente
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dc.subject.classification
CIENCIAS NATURALES Y EXACTAS
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dc.title
New chronostratigraphy for a lower to upper Carboniferous strike-slip basin of W-Precordillera (Argentina): Paleogeographic, tectonic and glacial importance
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2020-02-27T19:31:10Z
dc.journal.volume
96
dc.journal.pagination
1-24
dc.journal.pais
Países Bajos
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dc.journal.ciudad
Amsterdam
dc.description.fil
Fil: Milana, Juan Pablo. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Nacional de San Juan; Argentina
dc.description.fil
Fil: Di Pasquo, Mercedes. Provincia de Entre Ríos. Centro de Investigaciones Científicas y Transferencia de Tecnología a la Producción. Universidad Autónoma de Entre Ríos. Centro de Investigaciones Científicas y Transferencia de Tecnología a la Producción. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Centro de Investigaciones Científicas y Transferencia de Tecnología a la Producción; Argentina
dc.journal.title
Journal of South American Earth Sciences
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dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/pii/S0895981119303876
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1016/j.jsames.2019.102383
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