Origin of atoll lagoons

Purdy, Edward G.; Winterer, Edward L.

doi:10.1130/0016-7606(2001)113<0837:ooal>2.0.co;2

Cited by 82 publications

(81 citation statements)

References 30 publications

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“…We followed a similar approach to Purdy and Winterer (2001)) in compiling our dataset of lagoon depths, but we only included islands with complete spatial coverage and more than 100 bathymetric soundings across the lagoon. We also excluded islands in areas of apparent past or ongoing active tectonics.…”

Section: Atoll Morphologymentioning

confidence: 99%

“…In the model, lagoon sediment derives from in situ, primary production (P) and rim-transported material. A scaling factor is applied to the rim-derived sediment based on the area ratio of lagoon (a l ) to rim (a r ) (e.g., Daly, 1910;Purdy and Winterer, 2001):…”

Section: Model Formulationmentioning

confidence: 99%

“…therein), likely indicating substantial dissolution through those deposits. Located far from active tectonic Purdy and Winterer, 2001) unfilled lagoon. Cross and circle show locations of cores KAR-1 and XEN-3, respectively.…”

Section: Introductionmentioning

confidence: 99%

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Late Cenozoic sea level and the rise of modern rimmed atolls

Toomey

Ashton

Raymo

et al. 2016

Palaeogeography, Palaeoclimatology, Palaeoecology

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Sea-level records from atolls, potentially spanning the Cenozoic, have been largely overlooked, in part because the processes that control atoll form (reef accretion, carbonate dissolution, sediment transport, vertical motion) are complex and, for many islands, unconstrained on million-year timescales. Here we combine existing observations of atoll morphology and corelog stratigraphy from Enewetak Atoll with a numerical model to (1) constrain the relative rates of subsidence, dissolution and sedimentation that have shaped modern Pacific atolls and (2) construct a record of sea level over the past 8.5 million years. Both the stratigraphy from Enewetak Atoll (constrained by a subsidence rate of~20 m/Myr) and our numerical modeling results suggest that low sea levels (50-125 m below present), and presumably bi-polar glaciations, occurred throughout much of the late Miocene, preceding the warmer climate of the Pliocene, when sea level was higher than present. Carbonate dissolution through the subsequent sea-level fall that accompanied the onset of large glacial cycles in the late Pliocene, along with rapid highstand constructional reef growth, likely drove development of the rimmed atoll morphology we see today.Published by Elsevier B.V.

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Section: Atoll Morphologymentioning

confidence: 99%

Section: Model Formulationmentioning

confidence: 99%

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Late Cenozoic sea level and the rise of modern rimmed atolls

Toomey

Ashton

Raymo

et al. 2016

Palaeogeography, Palaeoclimatology, Palaeoecology

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“…Applied to a real case, pyReef-Core can be used to test several scenarios with different rates of subsidence and karstification in order to explain for example the discrepancy in age-elevation data of LIG deposits observed in the GBR (Marshall and Davies, 1982;Dechnik et al, 2017). It can also be used to estimate the contribution of karst dissolution and subsidence (Hopley et al, 2007;Purdy and Winterer, 2001) with a more quantitive approach. By 13 ka, sea level re-floods the LIG reef, and Holocene reef growth initiates ∼ 10.5 ka in the experiment (Fig.…”

Section: Communities Evolution and Synthetic Core Representationmentioning

confidence: 99%

“…The karstification of Pleistocene reef limestone has been identified as a controlling factor on variations in antecedent topography, which in turn is thought to influence the morphology of modern reefs (Purdy and Winterer, 2001). Rates of karstification are a function of exposure time, rainfall, porosity and original topography of exposed carbonate reefs.…”

Section: Initial Parametersmentioning

confidence: 99%

Exploring coral reef responses to millennial-scale climatic forcings: insights from the 1-D numerical tool pyReef-Core v1.0

et al. 2018

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Abstract. Assemblages of corals characterise specific reef biozones and the environmental conditions that change spatially across a reef and with depth. Drill cores through fossil reefs record the time and depth distribution of assemblages, which captures a partial history of the vertical growth response of reefs to changing palaeoenvironmental conditions. The effects of environmental factors on reef growth are well understood on ecological timescales but are poorly constrained at centennial to geological timescales. pyReefCore is a stratigraphic forward model designed to solve the problem of unobservable environmental processes controlling vertical reef development by simulating the physical, biological and sedimentological processes that determine vertical assemblage changes in drill cores. It models the stratigraphic development of coral reefs at centennial to millennial timescales under environmental forcing conditions including accommodation (relative sea-level upward growth), oceanic variability (flow speed, nutrients, pH and temperature), sediment input and tectonics. It also simulates competitive coral assemblage interactions using the generalised Lotka-Volterra system of equations (GLVEs) and can be used to infer the influence of environmental conditions on the zonation and vertical accretion and stratigraphic succession of coral assemblages over decadal timescales and greater. The tool can quantitatively test carbonate platform development under the influence of ecological and environmental processes and efficiently interpret vertical growth and karstification patterns observed in drill cores. We provide two realistic case studies illustrating the basic capabilities of the model and use it to reconstruct (1) the Holocene history (from 8500 years to present) of coral community responses to environmental changes and (2) the evolution of an idealised coral reef core since the last interglacial (from 140 000 years to present) under the influence of sea-level change, subsidence and karstification. We find that the model reproduces the details of the formation of existing coral reef stratigraphic sequences both in terms of assemblages succession, accretion rates and depositional thicknesses. It can be applied to estimate the impact of changing environmental conditions on growth rates and patterns under many different settings and initial conditions.

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2007

Karst Hydrogeology and Geomorphology

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Origin of atoll lagoons

Cited by 82 publications

References 30 publications

Late Cenozoic sea level and the rise of modern rimmed atolls

Late Cenozoic sea level and the rise of modern rimmed atolls

Exploring coral reef responses to millennial-scale climatic forcings: insights from the 1-D numerical tool pyReef-Core v1.0

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