Mr Ayrton Hamilton

BSc (Geology and Environmental Science), MSc (geology)

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Doctoral Candidate - Doctor of Philosophy

Research | Current

My PhD is evaluating the link between siliceous sinters and mineralisation at depth. Siliceous sinters are surface expressions of epithermal systems, where fluids derived from deep reservoirs with temperatures >175°C are discharged at the Earth’s surface. These fluids cool below 100°C, precipitating non-crystalline opal-A (silica) on biotic and abiotic surfaces to form erosion resistant, sinter mounds and sheet deposits, meters to tens of meters thick (e.g. Waiotapu, Rotorua, and Orakei Korako) that preserves environmentally significant textures of the hot springs, from the vent, and down spring-discharge channels to the distal apron, cooling to ambient marsh conditions. Sinters are closely linked to epithermal mineralisation, where epithermal deposits form at depths less than 1km from the surface and geothermal fluids boiling to form ore deposits. By analysing the textures, mineralogy and geochemistry of fossilised sinter deposit the paleo environment and paleo hydrology of the geothermal system can be evaluated

Postgraduate supervision

Professor Kathleen Campbell

Dr Julie Rowland

Selected publications and creative works (Research Outputs)

  • Hamilton, A. R., Campbell, K. A., Rowland, J. V., Barker, S., & Guido, D. M. (2019). Fossilised geothermal surface features of the Whitianga Volcanic Centre (Miocene), Coromandel Volcanic Zone, New Zealand: Controls and characteristics. Journal of Volcanology and Geothermal Research, 381, 209-226. 10.1016/j.jvolgeores.2019.06.009
    Other University of Auckland co-authors: Julie Rowland, Kathleen Campbell
  • Hamilton, A. R., Campbell, K. A., Rowland, J. V., Barker, S., & Guido, D. (2018). Characteristics and variations of sinters in the Coromandel Volcanic Zone: application to epithermal exploration. New Zealand Journal of Geology and Geophysics10.1080/00288306.2018.1519514
    Other University of Auckland co-authors: Kathleen Campbell, Julie Rowland
  • Hamilton, A., Campbell, K., Rowland, J., & Browne, P. (2017). The Kohuamuri siliceous sinter as a vector for epithermal mineralisation, Coromandel Volcanic Zone, New Zealand. Mineralium Deposita, 52 (2), 181-196. 10.1007/s00126-016-0658-8
    URL: http://hdl.handle.net/2292/34596
    Other University of Auckland co-authors: Julie Rowland, Kathleen Campbell
  • Hamilton, A. R. (2014). The Textures and Mineralogy of the Kohuamuri Siliceous Sinter, Coromandel Peninsula, and its Economic Potential The University of Auckland. ResearchSpace@Auckland.
    URL: http://hdl.handle.net/2292/22143

Contact details

Primary office location

SCIENCE CENTRE 302 - Bldg 302
Level 4, Room 443
23 SYMONDS ST
AUCKLAND CENTRAL
AUCKLAND 1010
New Zealand