Sequence stratigraphy of the of Los Rastros Formation lowermost portion (Ischigualasto Sub-basin/ Bermejo Basin – Argentina)

Authors

  • Cristiano Mundstock Fischer Petrobras
  • Ubiratan Ferrucio Faccini Universidade do Vale do Rio dos Sinos
  • Paulo Sérgio Gomes Paim Universidade do Vale do Rio dos Sinos
  • Tatiana dos Santos Rennau Universidade do Vale do Rio dos Sinos
  • Adriana Bracco Universidad Nacional de San Juan

Keywords:

Sequence stratigraphy, Fluvial-deltaic deposits, Foot-wall provenience, Post-rift sedimentation

Abstract

This study seeks to identify the stratigraphic signa-ture and sedimentary control in a lacustrine rift basin in the Los Rastros Formation (Carnian), Ischigualasto Sub-basin, Argentina. A stratigraphic framework (se-quence scale) is established for the interval, based on satellite images and outcrop analyses.
Four depositional sequences with similar faciology and stratigraphic architecture have been identified in a 120m thick interval - reflecting successive variations of accommodation creation. Subdivided into system tracts, each sequence initiates with incised valleys fills, represented by braided fluvial channels – sheet sands – at the base (early lowstand system tracts) and meandering fluvial channels associated with floodplain fine-grained lithofacies at the top (late lowstand system tracts).

Published

2009-11-01

Issue

Vol. 17 No. 2 (2009)

Section

Articles

How to Cite

FISCHER, Cristiano Mundstock; FACCINI, Ubiratan Ferrucio; PAIM, Paulo Sérgio Gomes; RENNAU, Tatiana dos Santos; BRACCO, Adriana. Sequence stratigraphy of the of Los Rastros Formation lowermost portion (Ischigualasto Sub-basin/ Bermejo Basin – Argentina). Boletim de Geociências da Petrobras, Rio de Janeiro, v. 17, n. 2, p. 273–290, 2009. Disponível em: https://bgp.petrobras.com.br/bgp/article/view/128. Acesso em: 20 sep. 2024.