Incorporating nutrients as a limiting factor in carbonate modelling

Clavera-Gispert, Roger; Carmona, Ana; Gratacós, Òscar; Tolosana‐Delgado, Raimon

doi:10.1016/j.palaeo.2012.02.025

Cited by 5 publications

(4 citation statements)

References 31 publications

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“…For instance, the use of residence time of water in the reef‐rim and lagoonal zones and supersaturation of calcium carbonate in sea water as key drivers for carbonate production would explain the formation of non‐ordered stratal architecture by lateral migration in the locus of deposition (Hill et al ., ). Moreover, consideration has been recently given to carbonate mud in suspension and nutrient availability used as limiting factors in modelling carbonate facies distribution and stratigraphy (Clavera‐Gispert et al ., ). However, there are poor constraints on such processes over times longer than a few hundreds of years.…”

Section: Discussionmentioning

confidence: 97%

Quaternary atoll development: New insights from the two‐dimensional stratigraphic forward modelling of Mururoa Island (Central Pacific Ocean)

et al. 2015

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Knowledge about the Quaternary evolution of mid-ocean atolls comes mainly from drilling and field observations carried out on a number of Pacific carbonate islands. However, little is known about the early to mid Pleistocene atoll development history, especially at margin and foreslope settings. Using previous field and subsurface data from Mururoa Atoll and a processbased modelling software (DIONISOS), a two-dimensional forward stratigraphic model of atoll development is proposed for the past 1Á8 million years (Myr). Observational data from vertical to inclined coring, seismic and bathymetric surveys indicate that, from approximately 0Á45 to 0Á40 million years before present (Ma), carbonate deposition at Mururoa Atoll resulted in a series of mostly prograding reef units. The model is first constrained at the base by the shape and topography of the pre-Quaternary basement. A number of sensitivity tests were performed to define the respective influence of variant parameters. The best-fit development scenario that accounts for the overall geometry and stratigraphic architecture of the Quaternary sediment packages is obtained by using the sea-level curve by Miller et al. (2005), uniform subsidence rate of 105 m Myr À1 , and carbonate production rates gradually increasing from 0Á50 to 8 mm yr À1 between 1Á80 Ma and the present. Additional controlling parameters include subaerial erosion (at a constant rate of 0Á25 m/kyr), wave-energy and sediment-transport processes. The stratigraphic forward model predicts a succession of three distinct types of carbonate systems that have developed since the earliest Pleistocene: toe of slope systems from 1Á80 Ma to about 0Á80 Ma, open-platform systems from 0Á80 Ma to 0Á50 Ma, and framework-reef systems from about 0Á50 Ma to the present. The development of these different systems is most likely to be controlled by climate and changes in sea-level cycles. During the low-amplitude 41 kyr cycle periods of the earliest Pleistocene, ambient conditions were not conducive to framework-reef growth; shallow-water carbonate sedimentation was dominantly gravity-driven, operating along the platform foreslopes only. During the Mid-Pleistocene Climate Transition, narrow, open-platform units have developed at the upper parts of the pre-Quaternary basement flanks. With the onset of the high-amplitude 100 kyr sea-level modes and climate restoration, reef frameworks started to be generated. These models from Mururoa agree with a number of previous studies suggesting that most of the true framework reefs were not initiated prior to 0Á50 Ma. Mururoa Atoll is 466 demonstrated to be a robust analogue for providing more realistic interpretations of the development history of Pacific atolls. Further modelling with three-dimensional DIONISOS could generate better predictions by taking into account hydrodynamic and transport parameters more accurately.

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Section: Discussionmentioning

confidence: 97%

Quaternary atoll development: New insights from the two‐dimensional stratigraphic forward modelling of Mururoa Island (Central Pacific Ocean)

et al. 2015

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“…A 3D process‐based forward sedimentary‐stratigraphic numerical model based on SIMSAFADIM (Bitzer & Salas, 2001, 2002) and SIMSAFADIM‐CLASTIC (Clavera‐Gispert et al., 2012, 2017; Gratacós et al., 2009) was used to construct stratigraphic architecture and facies distribution in continental margins. The main sedimentary processes that are modeled by the code are fluid flow, sediment transport, and deposition.…”

Section: Methodsmentioning

confidence: 99%

“…(2009), Clavera‐Gispert et al. (2012), and Clavera‐Gispert et al. (2017), and available from Òscar Gratacós (mailto:ogratacos@ub.edu).…”

Section: Data Availability Statementmentioning

confidence: 99%

“…Models: The conceptual model code is available at https://doi.org/10.5281/zenodo.7094202. SIMSAFADIM is described in Bitzer and Salas (2001) and Bitzer and Salas (2002), and SIMSAFADIM-CLASTIC in Gratacós et al (2009), Clavera-Gispert et al (2012), and Clavera-Gispert et al (2017, and available from Òscar Gratacós (ogratacos@ub.edu). RIFT2D is described in Wieck et al (1995) and in the text, and is available from Mark Person (mark.person@nmt.edu).…”

Section: Data Availability Statementmentioning

confidence: 99%

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Can Offshore Meteoric Groundwater Generate Mechanical Instabilities in Passive Continental Margins?

et al. 2023

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Offshore meteoric groundwater (OMG) has long been hypothesized to be a driver of seafloor geomorphic processes in continental margins worldwide. Testing this hypothesis has been challenging because of our limited understanding of the distribution and rate of OMG flow and seepage, and their efficacy as erosive/destabilizing agents. Here we carry out numerical simulations of groundwater flow and slope stability using conceptual models and evolving stratigraphy—for passive siliciclastic and carbonate margin cases—to assess whether OMG and its evolution during a late Quaternary glacial cycle can generate the pore pressures required to trigger mechanical instabilities on the seafloor. Conceptual model results show that mechanical instabilities using OMG flow are most likely to occur in the outer shelf to upper slope, at or shortly before the Last Glacial Maximum sea‐level lowstand. Models with evolving stratigraphy show that OMG flow is a key driver of pore pressure development and instability in the carbonate margin case. In the siliciclastic margin case, OMG flow plays a secondary role in preconditioning the slope to failure. The higher degree of spatial/stratigraphic heterogeneity of carbonate margins, lower shear strengths of their sediments, and limited generation of overpressures by sediment loading may explain the higher susceptibility of carbonate margins, in comparison to siliciclastic margins, to mechanical instability by OMG flow. OMG likely played a more significant role in carbonate margin geomorphology (e.g., Bahamas, Maldives) than currently thought.

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Process-based forward numerical ecological modeling for carbonate sedimentary basins

et al. 2017

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Incorporating nutrients as a limiting factor in carbonate modelling

Cited by 5 publications

References 31 publications

Quaternary atoll development: New insights from the two‐dimensional stratigraphic forward modelling of Mururoa Island (Central Pacific Ocean)

Quaternary atoll development: New insights from the two‐dimensional stratigraphic forward modelling of Mururoa Island (Central Pacific Ocean)

Can Offshore Meteoric Groundwater Generate Mechanical Instabilities in Passive Continental Margins?

Process-based forward numerical ecological modeling for carbonate sedimentary basins

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