Holocene reef growth in Torres Strait

The platform and fringing reefs of Torres Strait are morphologically similar to reefs of the northern Great Barrier Reef to the south, except that several are elongated in the direction of the strong tidal currents between the Coral Sea and the Gulf of Carpentaria. Surface and subsurface investigations and radiocarbon dating on Yam, Warraber and Hammond Islands reveal that the initiation and mode of Holocene reef growth reflect antecedent topography and sea-level history. On the granitic Yam Island, fringing reefs have established in some places over a Pleistocene limestone at about 6 m depth around 7000 years BP. Emergent Holocene microatolls of Porites sp. indicate that the reefs have prograded seawards while sea level has fallen gradually from at least 0.8 m above present about 5800 years BP. On the Warraber Island reef platform drilling near the centre indicated a Pleistocene limestone foundation at a depth of about 6 m over which reefs established around 6700 years BP. Reef growth lagged behind that on Yam Island. Microatolls on the mature reef flat indicate that the reef reached sea level around 5300 years BP when the sea was around 0.8–1.0 m above present. On the reef flat on the western side of Hammond Island bedrock was encountered at 7–8 m depth, overlain by terrigenous mud. A progradational reef sequence of only 1–2 m thickness has built seaward over these muds, as sea level has fallen over the past 5800 years. Reef-flat progradation on these reefs is interpreted to have occurred by a series of stepwise buildouts marked by lines of microatolls parallel to the reef crest, marking individual coalescing coral heads. Detrital infill has occurred between these. This pattern of reef progradation is consistent with the radiocarbon dating results from these reefs, and with seismic investigations on the Torres Reefs.

[1]  P. Larcombe,et al.  Terrigenous sediments as influences upon Holocene nearshore coral reefs, central Great Barrier Reef, Australia , 1999 .

[2]  A. Rattray.  Notes on the Geology of the Cape-York Peninsula, Australia , 1869, Quarterly Journal of the Geological Society of London.

[3]  A. Tudhope,et al.  Growth and Structure of Fringing Reefs in a Muddy Environment, South Thailand , 1994 .

[4]  D. Hopley.  Coastal Evolution: Continental shelf reef systems , 1995 .

[5]  C. Woodroffe,et al.  Microatolls as sea-level indicators on a mid-ocean atoll , 2000 .

[6]  D. Hopley.  Holocene Sea-level Changes in Australasia and the Southern Pacific , 1987 .

[7]  Lb Mason,et al.  Tidal modelling in Torres Strait and the Gulf of Papua , 1994 .

[8]  O. V. D. Plassche,et al.  Coastal evolution -- Late Quaternary shoreline morphodynamics , 1995 .

[9]  David Hopley,et al.  The geomorphology of the Great Barrier Reef: Quaternary development of coral reefs , 1982 .

[10]  J. Chappell.  Evidence for smoothly falling sea level relative to north Queensland, Australia, during the past 6,000 yr , 1983, Nature.

[11]  W. Willmott.  Igneous and metamorphic rocks of Cape York Peninsula and Torres Strait , 1973 .

[12]  T. P. Scoffin,et al.  Late Holocene sea level and reef-flat progradation, Phuket, South Thailand , 1998, Coral Reefs.

[13]  J. E. N. Veron.  Deltaic and Dissected Reefs of the Far Northern Region , 1978 .

[14]  P. Glynn,et al.  Evolution of Modern Caribbean Fringing Reef, Galeta Point, Panama , 1976 .

[15]  D. Johnson,et al.  Fringing reef growth on a terrigenous mud foundation, Fantome Island, central Great Barrier reef, Australia , 1987 .

[16]  W. Maxwell.  8 – GEOMORPHOLOGY OF EASTERN QUEENSLAND IN RELATION TO THE GREAT BARRIER REEF , 1973 .

[17]  K. Lambeck,et al.  Late Pleistocene and Holocene sea‐level change in the Australian region and mantle rheology , 1989 .

[18]  E. Olson,et al.  Radiocarbon profile of Hanauma Reef, Oahu, Hawaii , 1976 .

[19]  B. Thom,et al.  Drilling investigation of Bewick and Stapleton islands , 1978, Philosophical Transactions of the Royal Society of London. Series A, Mathematical and Physical Sciences.

[20]  I. Macintyre,et al.  Reef Response of Sea Level Rise: Keep-up, Catch-up or Give-up , 1985 .

[21]  D. Stoddart,et al.  Geomorphology of reef islands, northern Great Barrier Reef , 1978 .

[22]  D. Hopley,et al.  Morphology and development of the Cape Tribulation fringing reefs, Great Barrier Reef, Australia , 1989 .

[23]  H. Roberts,et al.  Developing carbonate platforms: Southern Gulf of Suez, northern Red Sea , 1984 .

[24]  O. Bellwood,et al.  Recent advances in marine science and technology , 1995 .

[25]  P. Harris,et al.  The nature of sediments forming the Torres Strait turbidity maximum , 1991 .

[26]  A Statistical Analysis of Storm Surges in Torres Strait , 1978 .

[27]  P. Harris,et al.  Late Quaternary Deltaic and Carbonate Sedimentation in the Gulf of Papua Foreland Basin: Response to Sea-Level Change , 1996 .

[28]  A. Barham.  The local environmental impact of prehistoric populations on Saibai Island, northern Torres Strait, Australia: enigmatic evidence from Holocene swamp lithostratigraphic records , 1999 .

[29]  B. Thom,et al.  Hydro-isostasy and the sea-level isobase of 5500 B.P. in north Queensland, Australia , 1982 .

[30]  P. Davies,et al.  Last interglacial reef growth beneath modern reefs in the southern Great Barrier Reef , 1984, Nature.