Tectono-sedimentary evolution of the Neoproterozoic BIF-bearing Jacadigo Group, SW-Brazil

Freitas, Bernardo T., Warren, Lucas V., Boggiani, Paulo C., De Almeida, Renato Paes and Piacentini, Thiago (2011) Tectono-sedimentary evolution of the Neoproterozoic BIF-bearing Jacadigo Group, SW-Brazil. Sedimentary Geology, 238 1-2: 48-70. doi:10.1016/j.sedgeo.2011.04.001


Author Freitas, Bernardo T.
Warren, Lucas V.
Boggiani, Paulo C.
De Almeida, Renato Paes
Piacentini, Thiago
Title Tectono-sedimentary evolution of the Neoproterozoic BIF-bearing Jacadigo Group, SW-Brazil
Journal name Sedimentary Geology   Check publisher's open access policy
ISSN 0037-0738
Publication date 2011-06-15
Sub-type Article (original research)
DOI 10.1016/j.sedgeo.2011.04.001
Volume 238
Issue 1-2
Start page 48
End page 70
Total pages 23
Place of publication Amsterdam, Netherlands
Publisher Elsevier
Language eng
Formatted abstract
The Jacadigo Group contains one of the largest sedimentary iron and associated manganese deposits of the Neoproterozoic. Despite its great relevance, no detailed sedimentological study concerning the unit has been carried out to date. Here we present detailed sedimentological data and interpretation on depositional systems, system tracts, external controls on basin evolution, basin configuration and regional tectonic setting of the Jacadigo Basin. Six depositional systems were recognized: (I) an alluvial fan system; (II) a siliciclastic lacustrine system; (III) a fan-delta system; (IV) a bedload-dominated river system; (V) an iron formation-dominated lacustrine or marine gulf system; and (VI) a rimmed carbonate platform system. The interpreted depositional systems are related to three tectonic system tracts. The first four depositional systems are mainly made of continental siliciclastics and refer to the rift initiation to early rift climax stage; the lake/gulf system corresponds to the mid to late rift climax stage and the carbonate platform represents the immediate to late post rift stage (Bocaina Formation deposits of the Ediacaran fossil-bearing Corumbá Group). The spatial distribution of the depositional systems and associated paleocurrent patterns indicate a WNW-ESE orientation of the master fault zone related to the formation of the Jacadigo Basin. Thus, the iron formations of the Jacadigo Group were deposited in a starved waterbody related to maximum fault displacement and accommodation rates in a restricted continental rift basin. The Fe–Si–Mn source was probably related to hydrothermal plume activity that reached the basin through the fault system during maximum fault displacement phases. Our results also suggest a restricted tectono-sedimentary setting for the type section of the Puga Formation. The Jacadigo Group and the Puga Formation, usually interpreted as glacial deposits, are readdressed here as basin margin gravitational deposits with no necessary relation to glacial processes.
Keyword Tectonics and sedimentation
Jacadigo group
Urucum district
Iron formations
Neoproterozoic
Banded iron-formations
Rare-earth-elements
Debris flows
Hydrothermal fluids
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Earth Sciences Publications
Official 2012 Collection
 
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Created: Mon, 05 Mar 2012, 22:34:56 EST by Ashleigh Paroz on behalf of School of Earth Sciences