Palaeohydrological data from the c. 2.0 to 1.8 Ga Waterberg Group, South Africa: discussion of a possibly unique Palaeoproterozoic fluvial style

Eriksson, P.G.; Long, Darrel G.F.; Bumby, Adam John; Eriksson, Kenneth A.; Simpson, Edward L.; Catuneanu, Octavian; Claassen, M. Isabella; Mtimkulu, Mtimkulu; Mudziri, Kenneth; Brümer, Jacobus J.; Neut, M. van der

doi:10.2113/gssajg.111.2-3.281

Cited by 24 publications

(24 citation statements)

References 47 publications

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“…Tais sedimentos foram transportados por amplos sistemas de canais braided (AF5), caracterizados por abundantes cargas de fundo e instabilidade dos bancos de canais devido a ausência de vegetação, predominantes no Pré-Cambriano (Figura 10) (Long, 1978(Long, , 2004Eriksson et al, 2008).…”

Section: Modelo Deposicionalunclassified

Depósitos flúvio-costeiros da formação raizama, Ediacarano-Cambriano da faixa Paraguai norte, região de nobres, Mato Grosso, Brasil

Santos

Júnior

Nogueira

et al. 2014

Geol. USP, Sér. cient.

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Disponível on-line no endereço www.igc.usp.br/geologiausp -19 -Resumo Depósitos siliciclásticos da Formação Raizama de idade ediacarana-cambriana são expostos descontinuamente ao longo da margem sul do Cráton Amazônico e Faixa Paraguai Norte, centro-oeste do Brasil. Estes depósitos são interpretados por sucessões costeiras progradacionais, sobrepondo em conformidade os depósitos carbonáticos do Grupo Araras. A análise faciológica e estratigráfica da seção aflorante na região de Nobres, Estado do Mato Grosso, permitiu a individualização de dezessete fácies sedimentares agrupadas em cinco associações de fácies (AF): AF1) shoreface inferior consiste de arenitos com laminação plano -paralela e truncada por onda (microhummocky), intercalados por pelitos laminados, e com níveis bioturbados por tubos verticais perfurantes; AF2) shoreface superior, formada por arenitos com estratificação plano-paralela e cruzada swaley; AF3) submaré, composta por arenitos com estratificações cruzadas tangenciais e acanaladas com recobrimentos de siltito/arenito muito fino interpretados como depósitos de canal e barras; AF4) planície de maré é caracterizada por arenitos com estratificação cruzada tangencial e sigmoidal, laminação plano-paralela a cruzada de baixo ângulo, gretas de contração, intercalados por siltititos/arenito muito finos com acamamento flaser, organizados em ciclos de raseamento ascendente; e AF5) fluvial entrelaçado distal é constituída por arenitos com estratificação cruzada acanalada com lags lateralmente descontínuos, estratificações plano-paralelas e cruzadas de baixo-ângulo, parcialmente retrabalhadas por onda. A sedimentação da Formação Raizama indica que o fornecimento de sedimentos siliciclásticos estariam relacionado a soerguimentos no Cráton à noroeste da área estudada, sucedendo os depósitos carbonáticos do Grupo Araras. Traços fósseis tubulares descritos na AF1 indicam, pela primeira vez, a presença de traços fósseis perfurantes sugerindo uma idade deposicional para Formação Raizama mais próxima ao limite Ediacarano-Cambriano.Palavras-chave: Ediacarano-Cambriano; Cráton Amazônico; Faixa Paraguai; Formação Raizama; Depósitos costeiros. AbstractThe Ediacaran-Cambrian Raizama Formation presents siliciclastic deposits exposed discontinuously along of the southern margin of the Amazon Craton and the Northern Paraguay Belt, Central-Western Brazil. These deposits are interpreted as progradational coastal succession conformably overling the carbonate platform succession of the Upper Araras Group. The facies and stratigraphic analysis of outcrop section were carried out in the Nobres region, State of Mato Grosso, allowed the individualization of seventeen facies, grouped into five facies associations (FA): FA1) lower shoreface, consisting of sandstone with parallel and wave-truncated lamination (microhummocky) parted by laminated mudstones, locally bioturbed by Skolithos; FA2) upper shoreface, composed by parallel and swaley cross bedded sandstone; FA3) subtidal, represented by sandstones with tangential and through...

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Section: Modelo Deposicionalunclassified

Depósitos flúvio-costeiros da formação raizama, Ediacarano-Cambriano da faixa Paraguai norte, região de nobres, Mato Grosso, Brasil

Santos

Júnior

Nogueira

et al. 2014

Geol. USP, Sér. cient.

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“…These saline pan deposits preserve micro-evaporitic features, such as those reflecting solution collapse and that have direct analogues in modern saline pans, and are one of the oldest reported examples (Simpson et al, 2004a). Climate change terminated the youngest erg (Simpson et al, 2002) as evidenced by massive sandstones generated by extreme precipitation events that degraded dune lee faces before truncation by the overlying Mogalakwena Formation fluvial system (Simpson et al, 2002;Eriksson et al, 2008a …”

Section: Aeolian Sedimentation and Secular Changementioning

confidence: 99%

Secular changes in sedimentation systems and sequence stratigraphy

et al. 2013

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________________________________________________________________________The ephemeral nature of most sedimentation processes and the fragmentary character of the sedimentary record are of first-order importance. Despite a basic uniformity of external controls on sedimentation resulting in markedly similar lithologies, facies, facies associations and depositional elements within the rock record across time, there are a number of secular changes, particularly in rates and intensities of processes that resulted in contrasts between preserved Precambrian and Phanerozoic successions. Secular change encompassed (1) variations in mantle heat, rates of plate drift and of continental crustal growth, the gravitational effects of the Moon, and in rates of weathering, erosion, transport, deposition and diagenesis;(2) a decreasing planetary rotation rate over time; (3) no vegetation in the Precambrian, but prolific microbial mats, with the opposite pertaining to the Phanerozoic; (4) the long-term evolution of the hydrosphere-atmosphere-biosphere system. A relatively abrupt and sharp turning point was reached in the Neoarchaean, with spikes in mantle plume flux and tectonothermal activity and possibly concomitant onset of the supercontinent cycle. Substantial and irreversible change occurred subsequently in the Palaeoproterozoic, whereby the dramatic change from reducing to oxidising volcanic gases ushered in change to an oxic environment, to be followed at ca. 2.4-2.3 Ga by the "Great Oxidation Event" (GOE); rise in atmospheric oxygen was accompanied by expansion of oxygenic photosynthesis in the cyanobacteria. A possible global tectono-thermal "slowdown" from ca. 2.45-2.2 Ga may have separated a preceding plate regime which interacted with a higher energy mantle from a ca. 2.2-2.0 Ga Phanerozoicstyle plate tectonic regime; the "slowdown" period also encompassed the first known global-scale glaciation and overlapped with the GOE. While large palaeodeserts emerged from ca. 2.0 -1.8 Ga, possibly associated with the evolution of the supercontinent cycle, widespread euxinia by ca. 1.85 Ga

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“…Although the paleohydrological calculations for ancient fluvial deposits are estimations, they still have sedimentological significance (e.g., Miall, 1977a;Ethridge and Schumm, 1978;Turner, 1980;Costa, 1983;Eriksson et al, 2006Eriksson et al, , 2008Davidson and Hartley, 2010) at least in comparison to other ancient deposits, in distinguishing proximal and distal parts within a formation, or to distinguish ancient channel patterns between alluvial fans and braided streams. Due to erosion of the stream channel-fills and compaction of sediments, these results only give an estimation of the possible minimum paleohydrological values.…”

Section: Paleohydrologymentioning

confidence: 99%

“…The sedimentology of the ancient braided stream sedimentation systems and channel-fills, in different tectonic settings, has been described in many studies (e.g., Eriksson et al, 2006Eriksson et al, , 2008Long, 2006), but only very few paleohydrological studies have been made on ancient fluvial deposits (e.g., Van Der Neut and Eriksson, 1999;Eriksson et al, 2006Eriksson et al, , 2008Davidson and Hartley, 2010;Köykkä, 2011). Eriksson et al (2006Eriksson et al ( , 2008 reported and discussed a possibly unique fluvial style from the Proterozoic (ca.…”

Section: Introductionmentioning

confidence: 99%

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The sedimentation and paleohydrology of the Mesoproterozoic stream deposits in a strike–slip basin (Svinsaga Formation), Telemark, southern Norway

Köykkä

2011

Sedimentary Geology

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Palaeohydrological data from the c. 2.0 to 1.8 Ga Waterberg Group, South Africa: discussion of a possibly unique Palaeoproterozoic fluvial style

Cited by 24 publications

References 47 publications

Depósitos flúvio-costeiros da formação raizama, Ediacarano-Cambriano da faixa Paraguai norte, região de nobres, Mato Grosso, Brasil

Depósitos flúvio-costeiros da formação raizama, Ediacarano-Cambriano da faixa Paraguai norte, região de nobres, Mato Grosso, Brasil

Secular changes in sedimentation systems and sequence stratigraphy

The sedimentation and paleohydrology of the Mesoproterozoic stream deposits in a strike–slip basin (Svinsaga Formation), Telemark, southern Norway

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