Geomorphology and late Holocene accretion history of Adele Reef: a northwest Australian mid-shelf platform reef
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The mid-shelf reefs of the Kimberley Bioregion are one of Australia’s more remote tropical reef provinces and such have received little attention from reef researchers. This study describes the geomorphology and late Holocene accretion history of Adele Reef, a mid-shelf platform reef, through remote sensing of contemporary reef habitats, shallow seismic profiling, shallow percussion coring and radiocarbon dating. Seismic profiling indicates that the Holocene reef sequence is 25 to 35 m thick and overlies at least three earlier stages of reef build-up, interpreted as deposited during marine isotope stages 5, 7 and 9 respectively. The cored shallow subsurface facies of Adele Reef are predominantly detrital, comprising small coral colonies and fragments in a sandy matrix. Reef cores indicate a ‘catch-up’ growth pattern, with the reef flat being approximately 5–10 m deep when sea level stabilised at its present elevation 6,500 years BP. The reef flat is rimmed by a broad low-relief reef crest only 10–20 cm high, characterised by anastomosing ridges of rhodoliths and coralliths. The depth of the Holocene/last interglacial contact (25–30 m) suggests a subsidence rate of 0.2 mm/year for Adele Reef since the last interglacial. This value, incorporated with subsidence rates from Cockatoo Island (inshore) and Scott Reefs (offshore), provides the first quantitative estimate of hinge subsidence for the Kimberley coast and adjacent shelf, with progressively greater subsidence across the shelf.
KeywordsReef Flat Marine Isotope Stage Crustose Coralline Alga Seismic Unit Inshore Reef
The Kimberley Reef Geomorphology Project 1.3.1 was funded by the Western Australian State Government and partners of the Western Australian Marine Science Institution. This paper is dedicated to the memory of our former project leader, the late Prof. Lindsay Collins, for his inspiring ideas and contribution to our knowledge of Western Australia’s seafloor and coral reefs. The research was assisted by the Kimberley Marine Research Station at Cygnet Bay who provided vessel support and access to research facilities. We would like to thank WA Museum for providing ground truth data through the WA Museum/Woodside Collection Project (Kimberley) 2008-2011. We also thank Geoscience Australia (GA) for providing DEMs data and the United States Geological Survey (USGS) for providing Landsat imagery. Last but not least, special thanks to valued members of the research team at Curtin University: Alexandra Stevens and Moataz Kordi. The article benefitted from constructive assessments by C.J.R. Braithwaite, L.F. Montaggioni and an anonymous reviewer.
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Conflict of interest
The authors declare that there is no conflict of interest with third parties.
- Brooke B (1997) Geomorphology of the north Kimberley coast. In: Walker D (ed) Marine biological survey of the central Kimberley coast, Western Australia. University of Western Australia, Perth, unpublished report, W.A. Museum Library no UR377, pp 13–39Google Scholar
- Collins LB (2011) Geological setting, marine geomorphology, sediment and oceanic shoals growth history of the Kimberley Region. J R Soc Western Australia 94(2):89–105Google Scholar
- Collins LB, Testa V, Zhao J, Qu D (2011) Holocene growth history and evolution of the Scott Reef carbonate platform and coral reef. J R Soc Western Australia 94(2):239–250Google Scholar
- Collins LB, O’Leary MJ, Stevens AM, Bufarale G, Kordi M, Solihuddin T (2015) Geomorphic patterns, internal architecture and reef growth in a macrotidal, high-turbidity setting of coral reefs from the Kimberley Bioregion. Aust J Maritime Ocean Affairs 7(1):12–22. doi: 10.1080/18366503.2015.1021411 CrossRefGoogle Scholar
- DEWHA (2008) A characterisation of the marine environment of the North-west Marine Region. Perth Workshop Report, A Summary of an Expert Workshop Convened in Perth, Western Australia, 5–6 September 2007. Department of the Environment, Water, Heritage and the Arts, Hobart, Commonwealth of AustraliaGoogle Scholar
- Embry AF, Klovan JE (1971) A late Devonian reef tract on northeastern Banks Island, N.W.T. Bull Can Petrol Geol 19(4):730–781Google Scholar
- Heyward AJ, Pinceratto E, Smith LD (1997) Big Bank Shoals of the Timor Sea: an environmental resource atlas. Australian Institute of Marine Science & BHP PetroleumGoogle Scholar
- Ingram BS (1982) Palynological examination of samples from Adele Island No. 1 from Well Completion Report. Brunswick Oil N.L.Google Scholar
- Marshall NG (1995) Adele Island No. 1 Palynological Report. Woodside Offshore PetroleumGoogle Scholar
- Maxwell WGH (1968) Atlas of the Great Barrier Reef. Elsevier, AmsterdamGoogle Scholar
- Müller G, Gastner M (1971) The ‘Karbonat-Bombe’, a simple device for the determination of carbonate content in sediment, soils, and other materials. Neues Jahrb Mineralogie Monatshefte 10:466–469Google Scholar
- Reimer PJ, Bard E, Bayliss A, Beck JW, Blackwell PG and 25 others (2013) IntCal13 and Marine13 radiocarbon age calibration curves 0–50,000 years cal BP. Radiocarbon 55(4):1869–1887Google Scholar
- Veron JEN (2000) Corals of the world. Australian Institute of Marine Science, vols 1–3Google Scholar
- Wilson BR (2013) The biogeography of the Australian North West Shelf: Environmental change and life’s response. Elsevier, Burlington, MAGoogle Scholar