Microbially Induced Sedimentary Structures--A New Category Within the Classification of Primary Sedimentary Structures--Discussion

Gingras, M. K.

doi:10.1306/101401720587

Cited by 8 publications

(3 citation statements)

References 12 publications

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“…N). Thin crusts exhibit a mottled, wrinkly surface which looks similar to descriptions by Klein () and Gingras () of wrinkle marks. There is a lack of aeolian scale dunes preserved within the outcrop successions, those dunes that are present are preserved at a maximum of 20 cm.…”

Section: Lithofacies Descriptionsmentioning

confidence: 92%

The applicability of modern tidal analogues to pre‐vegetation paralic depositional models

et al. 2018

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In modern siliciclastic environments terrestrial and aquatic vegetation binds substrate, controls weathering and erosion rates, influences run-off, sediment supply and subsequent depositional architecture. This study assesses the applicability of modern depositional models that are impacted by vascular vegetation, as analogues for ancient pre-land plant systems. A review of pre-Devonian published literature demonstrates a paucity of described tidal successions; this is possibly due to the application of modern analogues for interpreting the record when there is a lack of tidal indicators. This paucity suggests a need for revised models of tidal deposition that consider the different environmental conditions prior to land plant evolution. This study examines the OrdovicianSilurian Tumblagooda Sandstone, which is exposed in the gorge of the Murchison River and coastal cliffs near Kalbarri, Western Australia. The Tumblagooda Sandstone comprises stacked sand-rich facies, with well-preserved bedforms and trace fossils. Previous interpretations of the depositional setting have proposed from a mixed sheet-braided fluvial and intertidal flats; to a continental setting dominated by fluvial and aeolian processes. An enigmatic element is the rarity of mud-rich facies preserved in the succession. Outcrop logging, facies and petrographic analysis record dominantly shallow water conditions with episodes of emergence. Abundant ichnotaxa indicate that marine conditions and bi-directional flow structures are evidence for an intertidal and subtidal depositional environment. A macrotidal estuary setting is proposed, with evidence for tidal channels and repeated fluvial incursions. Physical and biogenic sedimentary structures are indicative of tidal conditions. The lack of clay and silt resulted in the absence of flaser or lenticular-bedding. Instead cyclic deposition of thin beds and foreset bioturbation replaced mud drape deposits. Higher energy conditions prevailed in the absence of the binding activity of plants in the terrestrial and marine realm. This is suggestive of different weathering processes and a reduction in the preservation of some sedimentary features.

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Section: Lithofacies Descriptionsmentioning

confidence: 92%

The applicability of modern tidal analogues to pre‐vegetation paralic depositional models

et al. 2018

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“…In such cases, the former presence of a microbial mat can only be inferred indirectly through physical or chemical properties of the sediment, e.g., indications of resistance to erosion, cohesiveness, modified permeability and mat-related mineralization (Schieber, 1999(Schieber, , 2004Schieber et al, 2007;Gerdes et al, 2000;Noffke et al, 2001a;Noffke, 2010). The resulting tell-tale sedimentary features, such as a lamina-specific sorting, shrinkage cracks, microbial sand chips or gas domes, are commonly referred to as microbially induced sedimentary structures (MISS; Noffke et al, 2001a;Gingras, 2002) or mat-related structures (MRS; Schieber et al, 2007;Eriksson et al, 2010). In the Moodies Group, microbial lamination occurs as black, dark green weathering, erosion-resistant, densely spaced, subparallel crinkly laminae.…”

Section: Identification and Classification Of Microbial Matsmentioning

confidence: 99%

Morphological adaptations of 3.22 Ga-old tufted microbial mats to Archean coastal habitats (Moodies Group, Barberton Greenstone Belt, South Africa)

Homann

Heubeck

Airo

et al. 2015

Precambrian Research

110

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a b s t r a c tMicrobial life was well established and widespread by the Paleoarchean; however, the degree of evolutionary advancement such as microbial motility, intra-and inter-species interactions, phototropism, or oxygenic photosynthesis by that time remains highly debated. The 3.22 Ga Moodies Group in the Barberton Greenstone Belt (BGB, South Africa) are Earth's oldest well-preserved siliciclastic tidal deposits. They exhibit a unique assemblage of microbial mats, providing an excellent opportunity to decipher the morphological adaptations of microbial communities to different paleoenvironmental settings. The fossil mats are preserved as kerogenous laminations (0.5-1 mm thick) that can be traced laterally for ∼15 km in a ∼1000 m-thick succession of fine-to coarse-grained tidal sandstones and conglomerates. We here present a detailed stratigraphic and depositional facies analysis, documenting the association of the three principal mat morphotypes with specific environmental settings: (1) planar-type in coastal floodplain, (2) wavy-type in intertidal, and (3) tufted-type in upper inter-to supratidal facies. All mat types indicate a flourishing phototrophic biota; moreover, the tufted morphology suggests an intricate level of coordinated growth commonly known from cyanobacterial mats in modern environments.

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“…Since these two types of sedimentary structures represent the terminal form of similar sedimentary structures, both of them are grouped into the wrinkle smctures in a broad sense. The scarcity of modern analogs leads to the debate on the actual origin of the wrinkle structures in a broad sense (Gingras, 2002;Noffie et al, 2002).…”

Section: Macroscopic Featuresmentioning

confidence: 99%

Sedimentary Features and Implications for the Precambrian Non‐stromatolitic Carbonate Succession: A Case Study of the Mesoproterozoic Gaoyuzhuang Formation at the Qiangou Section in Yanqing County of Beijing

Mingxiang

2008

Acta Geologica Sinica (Eng)

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In the long Precambrian period, stromatolitic carbonate successions were very common. However, the non‐stromatolitic carbonate succession that is marked by subtidal deposits shows a sharp contrast to the stromatolitic carbonate succession. Both the non‐stromatolitic and the stromatolitic carbonate successions are important clues for the further understanding of the evolving carbonate world of the Precambrian. The Mesoproterozoic Gaoyuzhuang Formation at the Qiangou section in northwestern suburb of Beijing is a set of more than 1000 m‐thick carbonate strata that can be divided into four members (or subformations), in which a non‐stromatolitic carbonate succession marked by the scarcity of stromatolites makes up the third member of the formation. This non‐stromatolitic carbonate succession can further be subdivided into three third‐order sequences that are marked by the regular succession of sedimentary facies. In third‐order sequences, a lot of subtidal carbonate meter‐scale cycles made up of medium‐bedded leiolite limestones and thin‐bedded marls constitute their transgressive system tracts (TSTs) and the early high‐stand system tracts (EHSTs), a lot of meter‐scale cycles made up by thin‐bedded limestones and marls constitute their condensed sections (CSs), and thick‐bedded to massive dolomitic limestones or lime dolomites make up the late high‐stand system tracts (LHSTs). The particularly non‐stromatolitic carbonate succession making up the third member of the Mesoproterozoic Gaoyuzhuang Formation at the Qiangou section might be the representative of the non‐stromatolitic carbonate succession of the Precambrian because of its special lithological features and particular sedimentary structures, and its general sedimentary features are helpful and meaningful for the further understanding of the evolution rules of the sophisticate and evolving carbonate world of the Precambrian. The time scale of the Gaoyuzhuang Formation is deduced as that from 1600 Ma to 1400 Ma; thus, the non‐stromatolitic sedimentary succession making up the third member of the Gaoyuzhuang Formation may demonstrate a stromatolite decline event occurring at ca. 1450 Ma of the Proterozoic besides other three events that occurred respectively at ca. 2000 Ma, ca. 1000 Ma and ca. 675 Ma. The forming duration of this non‐stromatolitic sedimentary succession of the third member of the Gaoyuzhuang Formation can be generally correlated with a similar sedimentary succession in North America, i.e. a non‐stromatolitic sedimentary succession of the Helena Formation of the Belt Supergroup, which suggests that the stromatolite decline occurring at ca. 1450 Ma might be a global event. Therefore, the non‐stromatolitic sedimentary succession discussed in the paper provides an important example for further understanding of carbonate sedimentology in the Precambrian.

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Microbially Induced Sedimentary Structures--A New Category Within the Classification of Primary Sedimentary Structures--Discussion

Cited by 8 publications

References 12 publications

The applicability of modern tidal analogues to pre‐vegetation paralic depositional models

The applicability of modern tidal analogues to pre‐vegetation paralic depositional models

Morphological adaptations of 3.22 Ga-old tufted microbial mats to Archean coastal habitats (Moodies Group, Barberton Greenstone Belt, South Africa)

Sedimentary Features and Implications for the Precambrian Non‐stromatolitic Carbonate Succession: A Case Study of the Mesoproterozoic Gaoyuzhuang Formation at the Qiangou Section in Yanqing County of Beijing

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