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dc.contributor.author
Veiga, Gonzalo Diego
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dc.contributor.author
Ventra, D.
dc.contributor.author
Moscariello, A.
dc.date.available
2023-08-03T14:42:21Z
dc.date.issued
2018
dc.identifier.citation
Fluvial-aeolian interaction at different scales in the Miocene Andean Foreland; XX International Sedimentological Congress; Quebec; Canadá; 2018; 291-291
dc.identifier.isbn
978-2-89146-937-1
dc.identifier.uri
http://hdl.handle.net/11336/206837
dc.description.abstract
Fluvial and aeolian processes interact at different spatial and temporal scales in dryland environments. Different scales of interactions result in contrasting scales of sedimentary heterogeneity in the rock record and can be related either to short-term changes in available runoff, to large-scale flooding of aeolian systems, and eventually to long-term climatic changes. In this contribution, different scales of fluvial-aeolian interactions are explored in a sedimentary succession developed in the Andean Foreland during the Miocene, the period of maximum uplift and more dramatic changes of landscape and climate in the area. The studied unit constitutes a 1500 m-thick succession that records the long-term evolution of a large fluvial fan. It is greatly dominated by fluvial deposits composed of channelized sandstones and conglomerates that intercalate with thick fine-grained overbank deposits. Aeolian deposits comprise well-sorted, fine- to medium-grained sandstones that show a wide range of thickness and lateral development, suggesting contrasting processes. The arid climate and the high-accommodation setting in a foreland basin provide an ideal context to analyse a relatively complete record of the interaction of fluvial and aeolian processes at variable scales.Small- and intermediate-scale interactions between fluvial and aeolian processes are mainly related to autogenic dynamics and to the intrinsic variability of hydrological processes in dryland systems, subject to winds capable of transporting and accumulating sand when not affected by the water table or its capillary fringe. Small-scale examples include aeolian reworking of water-lain deposits, resulting in dm-scale units that show better sorting and overall finer grain than the equivalent fluvial units. Intermediate-scale heterogeneities are in the studied case the consequence of more widespread flooding episodes of aeolian systems. These could be related to greater floods developed in the order of 101-102 years and are usually associated with low-gradient interdune areas. Irrespective of the wet or dry nature of the interdunes, large-scale flooding results in local accumulations of fluvial deposits, leading to the development of 10´s-m thick and 100-200 m wide, lens-shaped intercalations of fine-grained deposits within well-sorted, sandy aeolian dune deposits. Finally, large-scale interactions are related to allocyclic processes, mainly climate change leading to wetter and dryer periods in the evolution of this system, effective over a larger temporal framework (105-106 years). In the case at hand, the effect on the record is stronger in terms of petrophysical changes and sedimentary architecture as 10-m to 100-m thick sandy aeolian units (with subordinate fluvial-flood deposits) intercalate with conglomerates, sandstones and fine-grained intervals related to fluvial-dominated intervals (with minor aeolian reworking). Understanding this complex interactions of fluvial and aeolian processes in dryland environments and contrasting these styles with other units in the rock record may help to clarify different hierarchies of sedimentary heterogeneity in the subsurface and provide key elements in order to optimise development strategies, especially for mature fields.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
International Association of Sedimentologists
dc.rights
info:eu-repo/semantics/restrictedAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
FLUVIAL-AEOLIAN INTERACTIONS
dc.subject
SCALES
dc.subject
FORELAND BASINS
dc.subject
HETEROGENEITIES
dc.subject.classification
Geología
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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
Fluvial-aeolian interaction at different scales in the Miocene Andean Foreland
dc.type
info:eu-repo/semantics/publishedVersion
dc.type
info:eu-repo/semantics/conferenceObject
dc.type
info:ar-repo/semantics/documento de conferencia
dc.date.updated
2022-11-14T15:31:07Z
dc.journal.volume
1
dc.journal.pagination
291-291
dc.journal.pais
Canadá
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dc.journal.ciudad
Quebec
dc.description.fil
Fil: Veiga, Gonzalo Diego. 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.description.fil
Fil: Ventra, D.. Universidad de Ginebra; Suiza
dc.description.fil
Fil: Moscariello, A.. Universidad de Ginebra; Suiza
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://www.sedimentologists.org/isc
dc.conicet.rol
Autor
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dc.conicet.rol
Autor
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dc.conicet.rol
Autor
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dc.coverage
Internacional
dc.type.subtype
Congreso
dc.description.nombreEvento
XX International Sedimentological Congress
dc.date.evento
2018-08-13
dc.description.ciudadEvento
Quebec
dc.description.paisEvento
Canadá
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dc.type.publicacion
Book
dc.description.institucionOrganizadora
International Association of Sedimentologists
dc.source.libro
A sedimentary journey through 3 billion years in the new world. Book of abstracts
dc.date.eventoHasta
2018-08-17
dc.type
Congreso
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