Early to Middle Devonian ironstone and phosphorite in the northwestern Gondwana Parnaíba Basin, Brazil: A record of an epeiric margin paleoceanographic changes

Abram, Maísa Bastos; Holz, Michael

doi:10.1016/j.sedgeo.2020.105646

Cited by 9 publications

(4 citation statements)

References 79 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…There are only few conceptual models of ocean circulation for the Devonian that are based on an analogy with the modern world, where deep‐water formation occurs at high latitudes (Heckel & Witzke, 1979; Copper, 1986; Oczlon, 1990; Wendt, 1995; Dopieralska et al ., 2006; Hüneke, 2006; Dopieralska, 2009; Crasquin & Horne, 2018; Abram & Holz, 2020). These models are conflicting in many regards, not least because of the contradicting published plate‐tectonic and palaeogeographic reconstructions (e.g.…”

Section: Study Area and Geological Settingmentioning

confidence: 99%

“…Oceanographic models infer an eastward‐directed (warm) surface current along the northern margin of Gondwana as part of a large anticlockwise circulation cell between Gondwana and Laurussia (Heckel & Witzke, 1979; Oczlon, 1990; Hüneke, 2006; Abram & Holz, 2020). Eastward‐directed currents of (cold) deep water masses probably affected intermediate and deeper parts of the Gondwanan continental slope (Crasquin & Horne, 2018).…”

Section: Study Area and Geological Settingmentioning

confidence: 99%

See 1 more Smart Citation

Bioclastic bottom‐current deposits of a Devonian contourite terrace: Facies variability and depositional architecture (Tafilalt Platform, Morocco)

et al. 2023

View full text Add to dashboard Cite

The study examines bioclastic carbonate contourites that arise from the broad spectrum of bottom-current related sedimentary processes ranging from deposition to erosion. The result of the intermittent accumulation of sediment are thin and condensed successions with abundant hiatuses. Such bottom-current deposits are poorly known, since the broadly accepted contourite-facies model, the bi-gradational sequence, characterizes environments of contourite depositional systems as a continuous accretion of finegrained siliciclastic sediments. To increase current understanding of the carbonate facies within hiatal contourite records, the Eifelian-Frasnian of the Tafilalt Platform in Morocco was investigated. The succession is divided into five facies associations that are interpreted to reflect pelagic sedimentation and deposition from bottom currents on a contourite terrace, a gently inclined section of the upper slope of Gondwana shaped by a water-mass interface. Contourite deposition was mainly controlled by oxic clear-water currents (documented by moderately to completely bioturbated limestones with abundant hydrogenetic ferromanganese nodules, and low organic-carbon contents), at times also by an anoxic water mass (featured by organic-rich coquinas with absent to sparse bioturbation and predominantly syngenetic framboidal pyrites). Biostratigraphic data and the overall depositional architecture display palaeoceanographic hydrodynamic processes associated with a shifting water-mass interface. The inner terrace was characterized by an alongslope contourite channel and a small mounded drift at its downslope margin. Energetic bottom currents furthermore caused abraded surfaces, i.e. plain areas of non-deposition and localized erosion, and sandy condensation layers. The microfacies reflects repeated alternation between suspension deposition, winnowing of fines, bedload traction, dynamic sediment bypassing and reworking, together with concomitant seafloor cementation. Coquinas of mainly planktonic and nektonic organisms are identified as integral parts of bi-gradational contourite sequences showing inverse and normal grading. Hiatal lag concentrations of carbonate intraclasts, ferromanganese nodules and conodonts often drape hardgrounds and erosional surfaces at the midpoint of these frequently incomplete sequences. This Devonian case provides the 1413

show abstract

Section: Study Area and Geological Settingmentioning

confidence: 99%

Section: Study Area and Geological Settingmentioning

confidence: 99%

Bioclastic bottom‐current deposits of a Devonian contourite terrace: Facies variability and depositional architecture (Tafilalt Platform, Morocco)

et al. 2023

View full text Add to dashboard Cite

show abstract

“…4b) occurred during the Neoproterozoic-Cambrian (Cook and Shergold, 1984;Cook, 1992), the Permian-Triassic (Larina et al, 2019), the Cretaceous-Eocene, and the late Cenozoic (Schöllhorn et al, 2019). In addition, relatively smaller phosphorite deposits accumulated during other Phanerozoic periods, such as the Ordovician phosphorites of Sweden (Ilyin and Heinsalu, 1990), the Devonian phosphorites of northern Iran (Salama et al, 2018) and Brazil (Abram and Holz, 2020), and the Jurassic phosphorites of North America (Poulton and Aiken, 1989) and the Russian Platform (Kholodov and Paul, 2001). In our model, the development of phosphorite deposits is suggested to have been the result of highly efficient, rapid biologically-driven P cycling, which led to large amounts of P being transferred to the sedimentary reservoir over short periods of time.…”

Section: Ediacaran-phanerozoic Phosphogenesis Episodesmentioning

confidence: 99%

A Five‐stage Evolution of Earth's Phosphorus Cycle

JIAO,

DODD,

ALGEO

et al. 2023

Acta Geologica Sinica (Eng)

View full text Add to dashboard Cite

Phosphorus (P) is a key biological nutrient and probably the ultimate limiter of marine productivity during Earth history. In recent years, a wealth of new knowledge has revolutionized our understanding of the global P cycle, yet its long‐term evolution remains incompletely documented. In this paper, we review the effects of three major controlling factors on the long‐term evolution of the global P cycle, i.e., tectonics, marine redox conditions, and bio‐evolution, on the basis of which a five‐stage model is proposed: Stage I (>∼2.4 Ga), tectonic‐lithogenic‐controlled P cycling; Stage II (∼2.4 Ga to 635 Ma), low‐efficiency biotic P cycling; Stage III (∼635 Ma to 380 Ma), transitional biotic P cycling; Stage IV (∼380 Ma to near‐modern), high‐efficiency biotic P cycling; and Stage V (Anthropocene), human‐influenced P cycling. This model implies that the earlier‐proposed Ediacaran reorganization of the marine P cycle may represent only the start of a ∼250–Myr–long transition of the Earth's P cycle (Stage III) between the low‐efficiency biotic mode of the Proterozoic (Stage II) and the high‐efficiency biotic mode of the Phanerozoic (Stage IV). The development of biologically‐driven, high‐efficiency P cycling may have been a key factor for the increasing frequency and volume of phosphorite deposits since the late Neoproterozoic.

show abstract

“…These include the Cretaceous fluvial and estuarine deposits in the Potiguar Basin, Brasil (Melo et al 2020), and the Early Cretaceous Athabasca Oil Sands, in Western Canada (Mossop 1980). Besides, the upwelling of nutrients during transgression may favor the development of phosphorite deposits in shallow-marine strata (Abram et al 2011, Abram and Holz 2020, Kechiched et al 2020. At the end of the transgression, the Maximum Flooding Surface (MFS) marks the change from transgressive (below) to normal regression (highstand, above) stacking pattern (Frazier 1974, Galloway 1989).…”

Section: Transgressionmentioning

confidence: 99%

Sequence stratigraphy of clastic and carbonate successions: applications for exploration and production of natural resources

et al. 2021

View full text Add to dashboard Cite

Sequence stratigraphy is a method that unravels the evolution of sedimentation through time and space within sedimentary basins. Nowadays, the exploration and production of natural resources generated by or related to sedimentary processes depend on constructing a chronostratigraphic framework to identify sequences of distinct hierarchies. In clastic and carbonate successions, exploratory studies focus on higher-rank sequences to evaluate the potential of natural resources and to make discoveries. Conversely, lower-rank (i.e. high-frequency) sequences characterize and highlight the spatial and temporal occurrence of natural resource deposits and heterogeneities, necessary for optimizing production. For instance, high-resolution sequence stratigraphic surfaces may indicate the location of placer deposits or coal seams. In the petroleum industry, high-resolution sequence stratigraphy is applied in reservoir zonation and characterization, which are the stratigraphic essence of 3D geological and fluid flow models. Thus, this methodology can guide reservoir management, forecast and optimize production, and increase the ultimate recovery factor. Recent technological innovations such as virtual outcrop models and Ground Penetration Radar have promoted a significant advance in the visualization of surfaces and stacking patterns, making stratigraphic analysis more accurate and efficient than the traditional use of analogs.

show abstract

Early to Middle Devonian ironstone and phosphorite in the northwestern Gondwana Parnaíba Basin, Brazil: A record of an epeiric margin paleoceanographic changes

Cited by 9 publications

References 79 publications

Bioclastic bottom‐current deposits of a Devonian contourite terrace: Facies variability and depositional architecture (Tafilalt Platform, Morocco)

Bioclastic bottom‐current deposits of a Devonian contourite terrace: Facies variability and depositional architecture (Tafilalt Platform, Morocco)

A Five‐stage Evolution of Earth's Phosphorus Cycle

Sequence stratigraphy of clastic and carbonate successions: applications for exploration and production of natural resources

Contact Info

Product

Resources

About