Suspected microbial mat-related crack-like sedimentary structures in the Palaeoproterozoic Magaliesberg Formation sandstones, South Africa

Parizot, Manuel; Eriksson, P.G.; Aı̈fa, Tahar; Sarkar, S.; Banerjee, Santanu; Catuneanu, Octavian; Altermann, Wladyslaw; Bumby, Adam John; Bordy, Emese M.; Rooy, J.L. Van; Boshoff, Aileen

doi:10.1016/j.precamres.2005.05.007

Cited by 63 publications

(35 citation statements)

References 63 publications

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“…The Daspoort fluvial sandstones exhibit evidence for tidal reworking across the basin from east to west, as the Silverton epeiric sea advanced onto the craton from a shallow eastern Daspoort basin; a high rate of transgression may be inferred from the predominant fluvial facies preserved in the Daspoort rather than voluminous epeiric marine facies (on the basinal scale) (Eriksson and Catuneanu, 2004). In contrast, the Magaliesberg Formation, where essentially aggradational fluvial facies advanced predominantly from west to east, is characterized by a much greater degree of epeiric marine (tidal) influence, as inferred from the predominantly littoral facies preserved in this unit (Parizot et al, 2005). This suggests that Magaliesberg highstand aggradation was relatively slow compared to Daspoort transgression, allowing more thorough reworking.…”

Section: Discussionmentioning

confidence: 92%

“…salt works and laboratory models; Schneider, 1995;Gerdes and Klenke, 2003). Gerdes et al (2000) and Noffke et al (2001b) provide further examples of the perceived shallow marine -coastal bias in clastic mat studies in Pleistocene-modern tidal flats, as do Parizot et al (2005) for Palaeoproterozoic equivalents where they related MRS to inferred water depths and wave heights. In the Precambrian record, where the absence of grazers enhanced preservation and abundance of MRS, most marginal shallow marine settings formed part of preserved epeiric seas (e.g., Eriksson et al, 2008); as an example, Schieber (1998) relates MRS in the c. 1450-850 Ma Belt Supergroup of North America to a palaeoenvironmental spectrum ranging from calm offshore -shallow nearshore -sea-marginal sandflats -shallow nearshore lagoons.…”

Section: Environmental Affinities Of Microbial Matsmentioning

confidence: 89%

“…The predominant sandstone sheets discussed in the previous section for this formation crop out as thin (few cm to several dm thick on average) sandstone beds, and these are commonly covered with pervasive and perfectly preserved ripple marks, mainly of wave type and with bifurcation and varying crest alignments (Parizot et al, 2005), forming ripple fields of enormous lateral extent (Fig. 5) (Eriksson et al, 2010).…”

Section: Magaliesberg Formationmentioning

confidence: 94%

“…6). Parizot et al (2005) used the dimensions of the pervasive ripples to estimate water depths and wave heights (using the Tanner 1967Tanner , 1971 Manchuriophycus -petee ridges -ripple-crest cracks, respectively ordered from more proximal to more distal; Eriksson et al (2010) noted a caveat in this regard that time differences implicit in the periods required for mat growth (at least several weeks; cf. Gerdes andKlenke, 2003, 2007) would impinge on the postulated arrangement.…”

Section: Magaliesberg Formationmentioning

confidence: 99%

“…Gerdes andKlenke, 2003, 2007) would impinge on the postulated arrangement. The genesis of these various MRS along the Magaliesberg littoral are discussed in detail by Parizot et al (2005), Bosch and Eriksson (2008) and Eriksson et al (2010).…”

Section: Magaliesberg Formationmentioning

confidence: 99%

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A case study of microbial mat-related features in coastal epeiric sandstones from the Paleoproterozoic Pretoria Group (Transvaal Supergroup, Kaapvaal craton, South Africa); The effect of preservation (reflecting sequence stratigraphic models) on the relationship between mat features and inferred paleoenvironment

Eriksson¹,

Bartman²,

Catuneanu³

et al. 2012

Sedimentary Geology

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The Magaliesberg Formation sandstones within the upper part of the Pretoria Group are interpreted as a second-order highstand systems tract within an overall clastic epeiric marine setting, where episodic braided fluvial systems fed sediment directly into a tidally dominated coastline setting. Mat-related features are abundantly preserved within the inferred tidal flat and supratidal deposits. The Daspoort Formation sandstones at a lower stratigraphic level are ascribed to a closely analogous palaeoenvironmental setting, yet have hardly any preserved mat features at all; they are ascribed to a second-order transgressive systems tract in a sequence stratigraphic framework. During highstand the depositional systems are inferred to have aggraded, thus preserving the mat-related features formed in Magaliesberg intertidal-supratidal environments. During second-order transgression, the formation of the wave/tidal ravinement surface in the 2 subtidal/intertidal environments largely obliterated the features of the Daspoort intertidal and supratidal environments, leading to a paucity of mat-related structures in the preserved Daspoort succession. This case study thus supports the application of mat-related features to integrated palaeoenvironmental and sequence stratigraphic analysis, while emphasizing the role of preservation.

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Section: Discussionmentioning

confidence: 92%

Section: Environmental Affinities Of Microbial Matsmentioning

confidence: 89%

Section: Magaliesberg Formationmentioning

confidence: 94%

Section: Magaliesberg Formationmentioning

confidence: 99%

Section: Magaliesberg Formationmentioning

confidence: 99%

See 3 more Smart Citations

A case study of microbial mat-related features in coastal epeiric sandstones from the Paleoproterozoic Pretoria Group (Transvaal Supergroup, Kaapvaal craton, South Africa); The effect of preservation (reflecting sequence stratigraphic models) on the relationship between mat features and inferred paleoenvironment

Eriksson¹,

Bartman²,

Catuneanu³

et al. 2012

Sedimentary Geology

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Stratigraphy and facies analysis of the La Chilca Formation, Central Precordillera: Insights on the postglacial Ordovician–Silurian boundary and Early Silurian deposits from Argentina

2018

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The La Chilca Formation is exposed at the Poblete Norte and Ancha sections, Talacasto, Central Precordillera. Detailed facies analysis on field outcrops suggests a tide-dominated tidal plain model on the Silurian siliciclastic ramp, integrated by supratidal to subtidal plain deposits. The lower part of the La Chilca Formation (upper supratidal plain) is herein attributed to reworked glaciomarine deposits that occurred during interglacial Hirnantian age, under conditions of sea rise and the action of tidal amplification. The intertidal-supratidal depositional environments are represented by tidal channels, scour and fill, tidal dunes, and hummocky cross-stratified sandstones. The estimated tidal conditions for the tidal plain were mesotidal to macrotidal, under action of combined flows, attributed to the interaction of tidal currents and orbital low-velocity waves. The identification of microbially induced sedimentary structures (MISS) in these deposits, such as petee polygonal structures, pitted texture, imploded sand volcanoes, Astropolithon sp., Manchuriophycus sp., domal build-ups, biofilms, elephant skin, and trace fossils such as Chondrites sp., Zoophycos sp., Undichnia sp., Planolites sp., Monomorphichnus sp., and gastropod traces, may have played a protection and stabilization role on the clastic sediment surfaces against erosion of the La Chilca Formation deposits. The prolific growth of microbial mat on the intertidal to supratidal zone occurs explicitly at the turning points of transgression-regression cycles in shallow-water environments under stable base-level conditions. The middle-upper section of the La Chilca Formation shows non-cyclic rhythmites that are replaced by the cyclic rhythmites, suggesting an open tidal plain subject to an orbital/climatic rather than a tectonic control of cyclicity (Milankovitch cycles). The aggradation in this section indicates a shallowing towards the top of the formation. The La Chilca Formation records two third-order transgressive events and a shallowing event. The transgressive events are found in the base and top of the formation and are marked by the presence of Fe-oolites, while the shallowing event is determined by the presence of MISS.

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Paleoenvironmental Context of Microbial Mat-Related Structures in Siliciclastic Rocks

Eriksson

Sarkar

Samanta

et al. 2010

Cellular Origin, Life in Extreme Habitats and Astrobiology

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Suspected microbial mat-related crack-like sedimentary structures in the Palaeoproterozoic Magaliesberg Formation sandstones, South Africa

Cited by 63 publications

References 63 publications

Stratigraphy and facies analysis of the La Chilca Formation, Central Precordillera: Insights on the postglacial Ordovician–Silurian boundary and Early Silurian deposits from Argentina

Paleoenvironmental Context of Microbial Mat-Related Structures in Siliciclastic Rocks

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