Palaeomagnetism, rock magnetism and evolution of the Great Barrier Reef

C.E Barton; F.M Peerdeman

doi:10.1071/EG993311

ISSN: 0812-3985
E-ISSN: 1834-7533

Palaeomagnetism, rock magnetism and evolution of the Great Barrier Reef
Authors C.E Barton^a and F.M Peerdeman^b
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^a Australian Geological Survey Organisation, GPO Box 378, Canberra, , ACT, 2601 ^b Research School of Earth SciencesAustralian National University, Canberra, , ACT, 2601
Publisher: Australian Society of Exploration Geophysicists
Source: Exploration Geophysics, Volume 24, Issue 2, Jun 1993, p. 311 - 314
DOI: https://doi.org/10.1071/EG993311
- Published online: 01 Jun 1993

Abstract

Palaeomagnetic and rock magnetic properties have been determined for sediment cores collected during ODP Leg 133 from the continental slope adjacent to the Great Barrier Reef. The magnetic remanence properties of the sediments are poor, with a pervasive viscous overprint that obscures most reversal boundaries. However, an inter-core magnetic susceptibility stratigraphy has been established that permits some refinement of the existing biostratigraphy. The quality of the palaeomagnetic remanence record relates to the residence time of magnetic particles in the corrosive, near-surface, sulphate-reducing zone. Magnetic susceptibility variations appear to reflect glacio-eustatic sea level cycles, and show a strong inverse correlation with both δ¹⁸O and carbonate content. For the last several glacial maxima there are marked changes In magnetic properties, largely grain size-related, with sharp peaks in susceptibility and a reversal of the δ¹⁸O-susceptibility phase relationship. One possible explanation can be found in terms of fluvio-deltaic processes and inter-reefal lagoonal reservoirs that develop during times of low sea level and become reworked during transgressions. Changes in the pattern of susceptibility variation occur at approximately 0.8 Ma and 0.4 Ma. Boundaries at these ages are seen in seismic profiles, they occur in the δ¹⁸O frequency spectrum, and there is a rise in sea surface temperature at ~0.4 Ma. We suggest that these boundaries relate through palaeoclimatic and palaeoceanographic changes to stages in evolution of the Great Barrier Reef.

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References

Alexander, I., Kroon, R., and Thompson, R., (1993), ‘Late Quaternary paleoenvironmental change on the northeast Australian margin as evidenced in oxygen isotope stratigraphy, mineral magnetism and sedimentology’. Proc. ODP, Sci. Results, 133, College Station, TX (Ocean Drilling Program), in press.
Barton C.E., (1993), ‘Paleomagnetic and mineral magnetic record of sediments from the Queensland Trough: results from ODP Leg 133, Hole 823A’. Proc. ODP, Sci. Results, 133, College Station, TX (Ocean Drilling Program), in press.
Barton, C.E., Lackie, M. and Peerdeman,. F.M., (1993a), ‘Environmental control of magnetic properties of upper slope sediments near the Great Barrier Reef: results from ODP Leg 133, Site 820’. Proc. ODP, Sci. Results, 133, College Station, TX (Ocean Drilling Program), in press.
Barton, C.E., Omarzai, S.K., Alexander, I., Peerdeman, F. and McNeill, D., (1993b), ‘Magnetic stratigraphy and characterization of sediments from the northeast margin of Australia and relationship to environmental change during the Quaternary’. Proc. ODP, Sci. Results, 133, College Station, TX (Ocean Drilling Program), in press.
Davies, P.J., McKenzie, J.A., Palmer-Julson, A., etal., (1991), Proc. ODP, Init. Repts., 133, College Station, TX (Ocean Drilling Program), pp1496.
Feary, D.A. and Jarrard, R.D., (1993), ‘Sedimentology and downhole log analysis of ODP Site 820, central Great Barrier Reef outer shelf: the factors controlling progradational and aggradational seismic geometry’. Proc. ODP, Sci. Results, 133, College Station, TX (Ocean Drilling Program), in press.
Feary, D.A., Symonds, P.A., Davies, P.J., Pigram, C.J. and Jarrard, R.D., (1993), ‘Geometry of Pleistocene facies on the Great Barrier Reef outer shelf and upper slope seismic stratigraphy of ODP Sites 819-82T. Proc. ODP, Sci. Results, 133, College Station, TX (Ocean Drilling Program), in press.
Peerdeman, F.M., (1993), ‘The Pleistocene climatic and sea-level signature of the northeastern Australian continental margin’. PhD. Thesis (Unpubl.), Australian National University, Canberra, pp168.
Peerdeman, F.M. and Davies, P.J., (1993), ‘Sedimentological response of an outer shelf, upper slope sequence to rapid changes in Pleistocene eustatic sea level: ODP Hole 820A, northeast Australian margin’. Proc. ODP, Sci. Results, 133, College Station, TX (Ocean Drilling Program), in press.
Peerdeman, F.M., Davies, P.J. and Chivas, A.R., (1993), ‘Stable oxygen isotope signal in shallow-water, upper-slope sediments of the Great Barrier Reef ODP Hole 820A’. Proc. ODP, Sci. Results, 133, College Station, TX (Ocean Drilling Program), in press.
Wei, W. and Gartner, S., (1993), ‘Neogene calcareous nannofossils from Sites 811 and 819 through 825, offshore northeastern Australia’. Proc. ODP, Sci. Results, 133, College Station, TX (Ocean Drilling Program), in press.

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Article Type: Research Article

Keyword(s): environmental magnetism; Great Barrier Reef; oxygen isotopes; Palaeomagnetism; rock magnetism; sea level change

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Palaeomagnetism, rock magnetism and evolution of the Great Barrier Reef

Abstract

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