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dc.contributor.author
Schwarz, Ernesto
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dc.date.available
2019-03-25T18:09:38Z
dc.date.issued
2012-08
dc.identifier.citation
Schwarz, Ernesto; Sharp-based marine sandstone bodies in the Mulichinco Formation (Lower Cretaceous), Neuquén Basin, Argentina: Remnants of transgressive offshore sand ridges; Wiley Blackwell Publishing, Inc; Sedimentology; 59; 5; 8-2012; 1478-1508
dc.identifier.issn
0037-0746
dc.identifier.uri
http://hdl.handle.net/11336/72434
dc.description.abstract
The interpretation of sharp-based shallow-marine sandstone bodies encased in offshore mudstones, particularly transgressive units, has been a subject of recent debate. This contribution provides a multiple-dataset approach and new identification criteria which could help in the recognition of transgressive offshore sandstone bodies worldwide. This study integrates sedimentology, ichnology, taphonomy and palaeoecology of Mulichinco Formation strata in the central Neuquén Basin (Argentina) in order to describe and interpret sharp-based sandstone bodies developed in ramp-type marine settings. These bodies are sandwiched between finer-grained siliciclastics beneath and thin carbonates above. The underlying sediments comprise progradational successions from offshore mudstones to offshore transition muddy sandstones, grading occasionally into lower shoreface sandstones. The surfaces capping the regressive siliciclastics are flat and regionally extensive, and are demarcated by skeletal concentrations and a Glossifungites suite; they are also marked by sandstone rip-up clasts, with encrustations and borings on all sides. These surfaces are interpreted as composite discontinuities, cut during a relative sea-level fall and remodelled during the initial transgression. The overlying transgressive sandstone bodies are 3 to 7m thick, >4km long and about three times longer than wide; they are composed of fine-grained sandstones with little lateral change in grain size. Cross-stratification and/or cross-lamination are common, typically with smaller-scale structures and finer grain size towards the top. Large-scale, low-angle (5° to 8°) inclined stratification is also common, dipping at ca 30° with respect to body elongation and dominant currents. These sandstone bodies are interpreted as offshore sand ridges, probably developed under the influence of tidal currents. Intense burrowing is typical at the top of each unit, suggesting an abandonment stage. Final deactivation favoured colonization by epibenthic-dominated communities and the formation of skeletal-rich limestones during the latest transgressive conditions. As partial reworking of pre-existing ridges occurred during this stage, the Mulichinco sandstone bodies are considered the remnants of transgressive offshore sand units. © 2011 The Author. Journal compilation © 2011 International Association of Sedimentologists.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Wiley Blackwell Publishing, Inc
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dc.rights
info:eu-repo/semantics/openAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
Lower Cretaceous Ramp
dc.subject
Neuquen Basin
dc.subject
Offshore Sand Ridges
dc.subject
Siliciclastic/Carbonate Marine Systems
dc.subject
Transgressive Sandstone Units
dc.subject.classification
Meteorología y Ciencias Atmosféricas
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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
Sharp-based marine sandstone bodies in the Mulichinco Formation (Lower Cretaceous), Neuquén Basin, Argentina: Remnants of transgressive offshore sand ridges
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2019-03-18T14:11:57Z
dc.journal.volume
59
dc.journal.number
5
dc.journal.pagination
1478-1508
dc.journal.pais
Reino Unido
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dc.journal.ciudad
Londres
dc.description.fil
Fil: Schwarz, Ernesto. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Centro de Investigaciones Geológicas. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. Centro de Investigaciones Geológicas; Argentina
dc.journal.title
Sedimentology
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dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://onlinelibrary.wiley.com/doi/abs/10.1111/j.1365-3091.2011.01314.x
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/https://doi.org/10.1111/j.1365-3091.2011.01314.x
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