Sedimentology and formation of lagoonal platform reef islands in Huvadhoo Atoll, Maldives

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dc.contributor.advisor Kench, P en
dc.contributor.advisor Ford, M en Liang, Yiqing en 2017-09-20T21:26:21Z en 2016 en
dc.identifier.uri en
dc.description.abstract Sediment samples from the reef platform and island cores were collected from two lagoonal reef islands in Huvadhoo Atoll, Maldives, in order to investigate island evolution and building processes in a region where detailed sedimentary and chronology data do not yet exist. The chronostratigraphy of the study islands was resolved using sedimentary data from field samples, combined with radiocarbon ages of sediments and ground penetrating radar records of the island subsurface. Further, this study is the first to apply scanning electron microscopy and elemental mapping in the evaluation of single constituent dating of Halimeda spp. in order to investigate its suitability for inferring depositional chronology on reef islands. Chronostratigraphic results indicate that the lagoonal reef islands on Huvadhoo Atoll formed around 3000 years ago and reached their current dimensions by 350 cal yr BP. A three-phase model of island evolution was developed in relation to mid-Holocene sea-level rise, which presents the first incidence of island building over multiple phases of sea-level change in the Indian Ocean. Medium-scale (decadal) shoreline sediment redistribution identified from morphological field mapping and satellite imagery provide clues to the building processes that occurred during island evolution, and suggest frequent reworking of island sediments over the course of island building. Similar compositional properties of reef flat and island sediments suggest a reef-island link and that the study islands are still being maintained by their surrounding reefs at present. The formation of the lagoonal reef islands in Huvadhoo Atoll during various stages of sea-level change, along with the potential for shoreline adjustment and evidence of contemporary reef connectivity, suggest enhanced resilience of Maldivian reef islands in response to projected sea-level rise. en
dc.publisher ResearchSpace@Auckland en
dc.relation.ispartof PhD Thesis - University of Auckland en
dc.relation.isreferencedby UoA99264944611402091 en
dc.rights Items in ResearchSpace are protected by copyright, with all rights reserved, unless otherwise indicated. Previously published items are made available in accordance with the copyright policy of the publisher. en
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dc.title Sedimentology and formation of lagoonal platform reef islands in Huvadhoo Atoll, Maldives en
dc.type Thesis en Environmental Science en The University of Auckland en Doctoral en PhD en
dc.rights.holder Copyright: The author en
dc.rights.accessrights en
pubs.elements-id 671785 en
pubs.record-created-at-source-date 2017-09-21 en

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