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dc.contributor.authorToomey, Michael R.  Concept link
dc.contributor.authorWoodruff, Jonathan D.  Concept link
dc.contributor.authorDonnelly, Jeffrey P.  Concept link
dc.contributor.authorAshton, Andrew D.  Concept link
dc.contributor.authorPerron, J. Taylor  Concept link
dc.date.accessioned2016-11-01T17:55:13Z
dc.date.available2016-11-01T17:55:13Z
dc.date.issued2016-04-13
dc.identifier.citationMarine Geology 380 (2016): 284–289en_US
dc.identifier.urihttps://hdl.handle.net/1912/8489
dc.descriptionThis paper is not subject to U.S. copyright. The definitive version was published in Marine Geology 380 (2016): 284–289, doi:10.1016/j.margeo.2016.04.008.en_US
dc.description.abstractRivers have long been recognized for their ability to shape reef-bound volcanic islands. On the time-scale of glacial–interglacial sea-level cycles, fluvial incision of exposed barrier reef lagoons may compete with constructional coral growth to shape the coastal geomorphology of ocean islands. However, overprinting of Pleistocene landscapes by Holocene erosion or sedimentation has largely obscured the role lowstand river incision may have played in developing the deep lagoons typical of modern barrier reefs. Here we use high-resolution seismic imagery and core stratigraphy to examine how erosion and/or deposition by upland drainage networks has shaped coastal morphology on Tahaa, a barrier reef-bound island located along the Society Islands hotspot chain in French Polynesia. At Tahaa, we find that many channels, incised into the lagoon floor during Pleistocene sea-level lowstands, are located near the mouths of upstream terrestrial drainages. Steeper antecedent topography appears to have enhanced lowstand fluvial erosion along Tahaa's southwestern coast and maintained a deep pass. During highstands, upland drainages appear to contribute little sediment to refilling accommodation space in the lagoon. Rather, the flushing of fine carbonate sediment out of incised fluvial channels by storms and currents appears to have limited lagoonal infilling and further reinforced development of deep barrier reef lagoons during periods of highstand submersion.en_US
dc.description.sponsorshipThis project was supported by a Jackson School Distinguished Postdoctoral Fellowship to Michael Toomey and the WHOI Coastal Ocean Institute and Ocean and Climate Change Institute.en_US
dc.language.isoen_USen_US
dc.publisherElsevieren_US
dc.relation.urihttps://doi.org/10.1016/j.margeo.2016.04.008
dc.subjectCoralen_US
dc.subjectIslanden_US
dc.subjectLagoonen_US
dc.subjectDissolutionen_US
dc.subjectMorphologyen_US
dc.titleSeismic evidence of glacial-age river incision into the Tahaa barrier reef, French Polynesiaen_US
dc.typeArticleen_US
dc.identifier.doi10.1016/j.margeo.2016.04.008


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