1887
1st Australasian Exploration Geoscience Conference – Exploration Innovation Integration
  • ISSN: 2202-0586
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Abstract

In October-November 2012 a geophysical mapping and dredging campaign in the eastern Coral Sea was conducted on the RV during voyage ss2012_v06 (ECOSATI). Part of this campaign was focussed in northernmost Zealandia where volcanic seamounts and uplifted portions of the Lord Howe Rise were targeted to determine the age and location of the northern portion of the Lord Howe Seamount Chain. Geophysical and geological analysis of the dredge sites from the southernmost South Rennell Trough and Chesterfield Plateau confirm the extension of the Lord Howe Seamount Chain ~200 km northward than previously identified, with an age-progression extending to ~27-28 Ma. These new samples, together with previously published samples from the youngest part of the chain, show consistency with both Indo-Atlantic and Pacific hotspots. The average magma flux rate of the Lord Howe hotspot is estimated at 0.4 m3/s, which is similar to the rates of crustal production at the South Rennell Trough, A peak in magmatism along the trail in the late Oligocene may be related to a slowdown in the motion of the Australian plate sometime between 27-23 Ma. The results of the geophysical and geological sampling and estimates of magma flux from the Lord Howe Seamount Chain will assist in thermal history modelling in the sedimentary basins of northern Zealandia and will help provide a geological framework for frontier resource exploration in this region.

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/content/journals/10.1071/ASEG2018abT5_2A
2018-12-01
2026-01-15

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References

  1. Crossingham, T.J., Vasconcelos, P.M., Cunningham, T., Knesel, K.M., 2017. 40Ar/39Ar geochronology and volume estimates of the Tasmantid Seamounts: Support for a change in the motion of the Australian plate. Journal of Volcanology and Geothermal Research 343, 95-108.
  2. Davies, D., Rawlinson, N., Iaffaldano, G., Campbell, I., 2015. Lithospheric controls on magma composition along Earth’s longest continental hotspot track. Nature 525, 511-514.
  3. Exon, N., Hill, P., Lafoy, Y., Heine, C., Bernardel, G., 2006. Kenn Plateau off northeast Australia: a continental fragment in the southwest Pacific jigsaw.Australian Journal of Earth Sciences 53, 541-564.
  4. Fichtner, A., Kennett, B.L., Igel, H., Bunge, H.-P., 2010. Full waveform tomography for radially anisotropic structure: new insights into present and past states of the Australasian upper mantle. Earth and Planetary Science Letters 290, 270-280. Finn, C.A., Muller, R.D., Panter, K.S., 2005. A Cenozoic diffuse alkaline magmatic province (DAMP) in the southwest Pacific without rift or plume origin. Geochemistry, Geophysics, Geosystems 6.
  5. Gaina, C., Muller, D.R., Royer, J.Y., Stock, J., Hardebeck, J., Symonds, P., 1998. The tectonic history of the Tasman Sea: a puzzle with 13 pieces. Journal of Geophysical Research 103, 12413-12433.
  6. Grobys, J.W., Gohl, K., Eagles, G., 2008. Quantitative tectonic reconstructions of Zealandia based on crustal thickness estimates. Geochemistry, Geophysics, Geosystems 9.
  7. Johnson, R.W., Knutson, J., Taylor, S.R., 1989. Intraplate volcanism: in eastern Australia and New Zealand. Cambridge University Press.
  8. Kalnins, L., Cohen, B., Fitton, J., Mark, D., Richards, F., Barfod, D., 2015. The East Australian, Tasmantid, and Lord Howe Volcanic Chains: Possible mechanisms behind a trio of hotspot trails, AGU Fall Meeting Abstracts.
  9. King, S.D., Adam, C., 2014. Hotspot swells revisited. Physics of the Earth and Planetary Interiors 235, 66-83.
  10. Knesel, K.M., Cohen, B.E., Vasconcelos, P.M., Thiede, D.S., 2008. Rapid change in drift of the Australian plate records collision
  11. with Ontong Java plateau. Nature 454, 754.
  12. Larue, B., Daniel, J., Jouannic, C., Recy, J., 1977. The South Rennell Trough: Evidence for a fossil spreading zone.
  13. McDougall, I., Duncan, R.A., 1988. Age progressive volcanism in the Tasmantid Seamounts. Earth and Planetary Science Letters 89, 207-220.
  14. McDougall, I., Embleton, B., Stone, D., 1981. Origin and evolution of Lord Howe Island, southwest Pacific Ocean. Journal of the Geological Society of Australia 28, 155-176.
  15. Missegue, F., Collot, J.-Y., 1987. Etude geophysique du Plateau des Chesterfield (Pacifique sud-ouest): resultats preliminaires de la campagne ZOE200 du N/O Coriolis.
  16. Mortimer, N., Campbell, H.J., Tulloch, A.J., King, P.R., Stagpoole, V.M., Wood, R.A., Rattenbury, M.S., Sutherland, R., Adams, C.J., Collot, J., 2017a. Zealandia: Earth’s hidden continent. GSA Today 27.
  17. Mortimer, N., Gans, P., Meffre, S., Martin, C., Seton, M., Williams, S., Turnbull, R., Quilty, P., Micklethwaite, S., Timm, C., 2017b. Regional volcanism of northern Zealandia: post-Gondwana break-up magmatism on an extended, submerged continent. Geological Society, London, Special Publications 463, SP463. 469.
  18. Mortimer, N., Gans, P.B., Palin, J.M., Herzer, R.H., Pelletier, B., Monzier, M., 2014. Eocene and Oligocene basins and ridges of the Coral Sea- New Caledonia region: Tectonic link between Melanesia, Fiji, and Zealandia. Tectonics 33, 1386-1407.
  19. Norvick, M., Langford, R., Hashimoto, T., Rollet, N., Higgins, K., Morse, M., 2008. New insights into the evolution of the Lord Howe Rise (Capel and Faust basins), offshore eastern Australia, from terrane and geophysical data analysis.
  20. Sandwell, D.T., Smith, W.H., 2009. Global marine gravity from retracked Geosat and ERS- 1 altimetry: Ridge segmentation versus spreading rate. Journal of Geophysical Research: Solid Earth 114.
  21. Seton, M., Mortimer, N., Williams, S., Quilty, P., Gans, P., Meffre, S., Micklethwaite, S., Zahirovic, S., Moore, J., Matthews, K.J., 2016a. Melanesian back-arc basin and arc development: Constraints from the eastern Coral Sea. Gondwana Research 39, 77-95.
  22. Seton, M., Williams, S., Mortimer, N., Meffre, S., Micklethwaite, S., 2016b. Voyage report for SS2012V06 Eastern Coral Sea Tectonics (ECOSAT), R/V Southern Surveyor, October-November 2012.
  23. Slater, R.A., Goodwin, R.H., 1973. Tasman sea guyots. Marine Geology 14, 81-99.
  24. Smith, W.H., Sandwell, D.T., 1997. Global sea floor topography from satellite altimetry and ship depth soundings. Science 277, 1956-1962.
  25. Spice, H.E., Fitton, J.G., Kirstein, L.A., 2016. Temperature fluctuation of the Iceland mantle plume through time. Geochemistry, Geophysics, Geosystems 17, 243-254.
  26. Sreejith, K., Krishna, K., 2015. Magma production rate along the Ninetyeast Ridge and its relationship to Indian plate motion and Kerguelen hot spot activity. Geophysical Research Letters 42, 1105-1112.
  27. Sutherland, F., 1983. Timing, trace and origin of basaltic migration in eastern Australia. Nature 305, 123-126.
  28. Terrill, A., 1975. Part 1. East Autralian margin and the western marginal basins: Depositional and tectonic patterns in the northern lord howe rise-Mellish rise area. Exploration Geophysics 6, 37-39.
  29. Timm, C., Hoernle, K., Werner, R., Hauff, F., van den Bogaard, P., White, J., Mortimer, N., Garbe-Schonberg, D., 2010. Temporal and geochemical evolution of the Cenozoic intraplate volcanism of Zealandia. Earth-Science Reviews 98, 38-64.
  30. Tulloch, A., Ramezani, J., Mortimer, N., Mortensen, J., van den Bogaard, P., Maas, R., 2009. Cretaceous felsic volcanism in New Zealand and Lord Howe Rise (Zealandia) as a precursor to final Gondwana break-up. Geological Society, London, Special Publications 321, 89-118.
  31. Vidal, V., Bonneville, A., 2004. Variations of the Hawaiian hot spot activity revealed by variations in the magma production rate. Journal of Geophysical Research: Solid Earth 109.
  32. Vogt, P.R., Conolly, J.R., 1971. Tasmantid Guyots, the age of the Tasman Basin, and motion between the Australia plate and the mantle. Geological Society of America Bulletin 82, 2577-2584.
  33. Wellman, P., McDougall, I., 1974. Cainozoic igneous activity in eastern Australia. Tectonophysics 23, 49-65.
  34. Wessel, P., 2015. Regional-residual separation of bathymetry and revised estimates of Hawaii plume flux. Geophysical Journal International 204, 932-947.
  35. Wessel, P., Smith, W.H., Scharroo, R., Luis, J., Wobbe, F., 2013. Generic mapping tools: improved version released. Eos, Transactions American Geophysical Union 94, 409-410.
  36. White, R.S., 1993. Melt production rates in mantle plumes. Philosophical Transactions: Physical Sciences and Engineering, 137-153.
  37. Williams, S., Flament, N., Muller, R.D., Butterworth, N., 2015. Absolute plate motions since 130 Ma constrained by subduction zone kinematics. Earth and Planetary Science Letters 418, 66-77.
/content/journals/10.1071/ASEG2018abT5_2A
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  • Article Type: Research Article
Keyword(s): hotspots; Lord Howe Seamount Chain; magma flux; plate motion; RV Southern Surveyor; Zealandia

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