The leaking bucket of a Maldives atoll: Implications for the understanding of carbonate platform drowning

Betzler, Christian; Lindhorst, Sebastian; Lüdmann, Thomas; Weiß, Benedikt; Wunsch, Marco; Braga, Juan C.

doi:10.1016/j.margeo.2015.04.009

Cited by 35 publications

(31 citation statements)

References 61 publications

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“…Discontinuous marginal rims formed by such small atolls surround lagoons with water depths up to 50-60 m. These rims are interrupted by deep passages, allowing strong currents within the atoll lagoons to rework and redeposit sediment and influence the growth of patch reefs (Ciarapica and Passeri, 1993;Betzler et al, 2015). Modern marginal reefs are composed of robust-branching corals and coralline algae, whereas the lagoonal reefs show domal corals and detrital sand and rubble facies (Gischler et al, 2008).…”

Section: Background Geological Setting Of the Maldivesmentioning

confidence: 99%

Untitled

Betzler

Eberli

Zarikian

et al. 2016

International Ocean Discovery Program Preliminary Report

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Section: Background Geological Setting Of the Maldivesmentioning

confidence: 99%

Untitled

Betzler

Eberli

Zarikian

et al. 2016

International Ocean Discovery Program Preliminary Report

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“…For instance, lagoon sedimentation rates (typically N1 mm/yr during the Holocene ≈ 1000 m/Myr; Montaggioni, 2005) far outpace atoll subsidence rates (~15-30 m/Myr; Section 3.1) and thus lagoons would rapidly be filled in the absence of depositional hiatuses due to subaerial exposure during sea-level lowstands (Purdy and Gischler, 2005) or sediment 'leaks' due to strong currents and incomplete closure of the rim (e.g., Betzler et al, 2015;Purdy and Gischler, 2005). Rapid infilling should produce 'full-bucket' atolls typified by shallow, sediment-filled lagoons (Fig.…”

Section: Introductionmentioning

confidence: 99%

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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“…Discontinuous marginal rims formed by such small atolls surround lagoons with water depths to 50-60 m. These rims are interrupted by deep passages, allowing strong currents within the atoll lagoons to rework and redeposit sediment and influence the growth of patch reefs (Ciarapica and Passeri, 1993;Betzler et al, 2015). Modern marginal reefs are composed of robust-branching corals and coralline algae, whereas the lagoonal reefs show domal corals and detrital sand and rubble facies (Gischler et al, 2008).…”

Section: Introductionmentioning

confidence: 99%

“…Modern marginal reefs are composed of robust-branching corals and coralline algae, whereas the lagoonal reefs show domal corals and detrital sand and rubble facies (Gischler et al, 2008). Muddy sediments are present only in atoll areas that are protected by large marginal reefs (Ciarapica and Passeri, 1993;Gischler, 2006;Betzler et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

“…This figure is available in an oversized format. DS2 DS3 DS3 DS3 DS4 DS4 DS5 DS5 DS6 DS6 DS6 DS7 DS7 DS7 DS8 DS8 DS8 DS9 DS9 DS9 DS1 DS10 DS10 DS10 DS2 DS3 -DS6 DS7 DS8 DS9 DS10 PS10 0 Engelbrecht, 1991), accounting for winnowing in the passages and lagoons, where hard bottoms form (Ciarapica and Passeri, 1993;Gischler, 2006;Betzler et al, 2015). The Maldives formed on a lower Paleogene (60-50 Ma) volcanic basement (Duncan and Hargraves, 1990) (Figure F6).…”

Section: Introductionunclassified

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