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Carla Gimena Puigdomenech Negre.pdf: 68441904 bytes, checksum: f8fd050c9f04f279118e53874d55222a (MD5)
Previous issue date: 2014-02-20 / BG Group Brasil / The transport mechanism and deposition of sediments in deep water environments and their relationship with deltaic systems have captioned the attention of sedimentologists during the last decades due its importance as hydrocarbon reservoir. This work presents a comparative study of this kind of related deposits in two distinct areas with significant records of the Late Paleozoic glaciation of western Gondwana: (i) the well exposed deposits of Cerro Bola that belong to the Paganzo Group and (ii) the not so well exposed (but with potential economic interest) deposits of Rio do Sul Formation (Itararé Group) in Vidal Ramos, Paraná basin. Cerro Bola records 1000 m of sediment corresponding to five glacial/deglacial cycles; this work focuses on the relationship between the upper part of Cycle 3 and 4, corresponding to Upper Turbidites and Fluviodeltaic 3, respectively. Based on the sedimentary features here presented, the Fluviodeltaic 3 is re-interpreted as a sand-rich submarine fan in which the high sedimentation rates are interpreted as related to tectonic activity. The area of Vidal Ramos exposes~ 400 m of the Itararé Group. This research focuses on the upper part of Rio do Sul Formation, which records deltaic sediments dominated by gravity flows in the lower part. The upper part is characterized by a sandy delta front progradation associated with an increased sediment supply. The data presented in this work shows that the delta front deposits under conditions of slope instability generated gravity flows which are deposited as turbidites in the distal delta front/prodelta and is related to the effects of deglacial conditions and phases of increased sediment supply to deep water environments. The results indicate that the two areas are not directly comparable due to distinct depositional processes and paleogeographic configurations. The thick succession of sandstones in Cerro Bola is interpreted as turbidite fan controlled by tectonic activities in a deep basin context, while in Vidal Ramos the identified progradational sandy delta front is produced by a phase of increased sediment supply related to deglacial processes.
| Identifer | oai:union.ndltd.org:IBICT/oai:www.repositorio.jesuita.org.br:UNISINOS/3097 |
| Date | 20 February 2014 |
| Creators | Negre, Carla Gimena Puigdomenech |
| Contributors | http://lattes.cnpq.br/5022601976087377, Kneller, Benjamin C., Faccini, Ubiratan Ferrucio |
| Publisher | Universidade do Vale do Rio dos Sinos, Programa de Pós-Graduação em Geologia, Unisinos, Brasil, Escola Politécnica |
| Source Sets | IBICT Brazilian ETDs |
| Language | English |
| Detected Language | English |
| Type | info:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/masterThesis |
| Source | reponame:Repositório Institucional da UNISINOS, instname:Universidade do Vale do Rio dos Sinos, instacron:UNISINOS |
| Rights | info:eu-repo/semantics/openAccess |
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