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Heterogeneous distribution of trace fossils across initial transgressive deposits in rift basins: an example from the Springhill Formation, Argentina

Richiano, Sebastián ; Varela, Augusto N. ; Poiré, Daniel G.

Lethaia, 2016-10, Vol.49 (4), p.524-539 [Periódico revisado por pares]

Oslo: Wiley

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  • Título:
    Heterogeneous distribution of trace fossils across initial transgressive deposits in rift basins: an example from the Springhill Formation, Argentina
  • Autor: Richiano, Sebastián ; Varela, Augusto N. ; Poiré, Daniel G.
  • Assuntos: Arenicolites ; Cylindrichnus ; Diplocraterion ; krittiden ; Lower Cretaceous ; Ophiomorpha ; rift basins ; shallow marine deposits ; Skolithos ; sporfossiler ; transgressive systems tract
  • É parte de: Lethaia, 2016-10, Vol.49 (4), p.524-539
  • Notas: 10.18261/let
    ark:/67375/WNG-PMSQ94LG-0
    ArticleID:LET12163
    Universidad Nacional de La Plata
    National University of La Plata - No. N/511
    Agencia Nacional de Promoción Científica y Tecnológica - No. PICT 2012- 0828; No. PICT 2013-1298
    Table S1. Description and interpretation of the 12 facies associations identified for the Springhill Formation at the study area.
    istex:98801A35E5DDDC1A631E0ABDB2B2AD0433623631
    CONICET - No. PIP 6237/05; No. PIP 1016/10
    Vol. 49, no. 4 (2016)
    ObjectType-Article-1
    SourceType-Scholarly Journals-1
    ObjectType-Feature-2
    content type line 23
  • Descrição: In the Lago San Martín region (Santa Cruz Province, Argentina), the Springhill Formation (50–100 m thick) overlies the syn-rift El Quemado Complex, showing outcrops with wedge geometry. Four sedimentological sections were measured in the field, and three depositional palaeoenvironments were interpreted. The Springhill Formation starts with fluvial deposits, characterized by channel-fills and floodplains with palaeosol development, passing transitionally to a coastal plain and, finally, to marine sedimentation. The initial sandy transgressive deposits (Facies Association 9) are the main focus of this study, in which 10 ichnogenera (Arenicolites, Bergaueria, Cylindrichnus, Diplocraterion, Macaronichnus, Palaeophycus, Planolites, Ophiomorpha, Rosselia and Skolithos) are described. Two ichnoassociations (foreshore and shoreface) were defined, and their distribution was controlled by the local palaeoenvironmental conditions, mainly energy, bathymetry and grain size of sediments. A highly bioturbated surface (BI = 4) was recognized in Section 1 showing a limited occurrence and disappearing over short distances perpendicular to the palaeoshoreline. This surface shows a sharp sub-horizontal gently undulating top contact with a bioturbation thickness between 15 and 25 cm. This type of surface has limited usefulness as a key correlative surface, because it is spatially restricted in rift basins due to the tectonic activity, which creates high accommodation space rates. A more accurate characterization of the initial transgressive deposits of the Springhill Formation – which is the most important reservoir in southern Patagonia – could provide new ideas to solve problems in sub-surface studies.
  • Editor: Oslo: Wiley
  • Idioma: Inglês;Norueguês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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