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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

A prodeltaic system controlled by hyperpycnal flows and storm waves: reinterpretation of the Punta Negra Formation (Lower-Middle Devonian, Argentine Precordillera)

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Vieira de Luca, Pedro Henrique [1] ; Basilici, Giorgio [2]
Total Authors: 2
[1] Univ Estadual Campinas, UNICAMP, Inst Geociencias, Programa Posgrad Geociencias, Campinas, SP - Brazil
[2] Univ Estadual Campinas, UNICAMP, Inst Geociencias, Campinas, SP - Brazil
Total Affiliations: 2
Document type: Journal article
Source: BRAZILIAN JOURNAL OF GEOLOGY; v. 43, n. 4, p. 673-693, DEC 2013.
Web of Science Citations: 3

The Punta Negra Formation (FPN) constitutes a Lower-Middle Devonian sandstone unit located in the Argentine Precordillera. Based on detailed facies and ichnological analyses, this unit, which had been previously interpreted as a deep-water system, has been reinterpreted in this study as a prodelta system, in which the distribution and sedimentation of the clastic deposits were controlled by hyperpycnal flows associated with storms. Five lithofacies attest the deposition by unidirectional hyperpycnal flows combined with storm-generated oscillatory flows. Fossil traces testify variable energetic conditions of the depositional system with the colonization of opportunistic organisms immediately after the deposition of high energy combined flows and the colonization of more specialized organisms during the long low-energy periods. Three architectural elements, deposited from coastline to offshore, have been recognized: 1) Channelized sandstone, composed of the thickest and coarsest sandstone beds and interpreted as the proximal portion deposited close to the mouth of the distributaries of the delta system; 2) Tabular sandstone, which are composed of combined and oscillatory flow deposits with lesser thickness, grain size and spacing of the undulated bed forms; 3) Tabular sandstone interbedded to mudstone, which represents the most distal architectural element and is composed of thin sandstone and thicker mudstone strata, deposited by low-energy combined flows. (AU)

FAPESP's process: 06/00525-2 - Mechanisms and architecture of siliciclastic deposits from shelf to deepwater basin: analogous of the Ordovician Argentine Precordillera and Cambrian Sergipano Belt
Grantee:Giorgio Basilici
Support type: Regular Research Grants