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Fox, Bethany R Storrs; Wartho, Jo-Anne; Wilson, Gary S; Lee, Daphne E; Nelson, Faye E; Kaulfuss, Uwe (2014): Magnetic properties of maar lake sediments from Otago, New Zealand. PANGAEA, https://doi.org/10.1594/PANGAEA.834782, Supplement to: Fox, BRS et al. (2015): Long-term evolution of an Oligocene/Miocene maar lake from Otago, New Zealand. Geochemistry, Geophysics, Geosystems, 16(1), 59-76, https://doi.org/10.1002/2014GC005534

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Abstract:
Foulden Maar is a highly resolved maar lake deposit from the South Island of New Zealand comprising laminated diatomite punctuated by numerous diatomaceous turbidites. Basaltic clasts found in debris flow deposits at the base of the cored sedimentary sequence yielded two new 40Ar/39Ar dates of 24.51±0.24 Ma and 23.38±0.24 Ma (2sigma). The younger date agrees within error with a previously published 40Ar/39Ar date of 23.17±0.19 Ma from a basaltic dyke adjacent to the maar crater. The diatomite is inferred to have been deposited over several tens of thousands of years in the latest Oligocene/earliest Miocene, and may have overlapped with the period of rapid glaciation and subsequent deglaciation of Antarctica known as the Mi-1 event. Sediment magnetic properties and SEM measurements indicate that the magnetic signal is dominated by pseudo-single domain pyrrhotite. The most likely source of detrital pyrrhotite is schist country rock fragments from the inferred tephra ring created by the phreatomagmatic eruption that formed the maar. Variations in magnetic concentration and lamina thickness indicate a decrease in erosional input and increase in diatom productivity throughout the depositional period, suggesting a long-term (tens of thousands of years) climatic change in New Zealand in the latest Oligocene/earliest Miocene.
Coverage:
Latitude: -45.528400 * Longitude: 170.219500
Event(s):
FH2 * Latitude: -45.528400 * Longitude: 170.219500 * Location: Foulden Maar, Otago, New Zealand * Device: Drilling/drill rig (DRILL)
Size:
11 datasets

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Datasets listed in this publication series

  1. Fox, BRS; Wartho, J-A; Wilson, GS et al. (2014): ARM measurements from the Foulden Maar core FH2 prior to demagnetisation. https://doi.org/10.1594/PANGAEA.834777
  2. Fox, BRS; Wartho, J-A; Wilson, GS et al. (2014): Coercivity of remanence and remanent acquisition coercive force for Foulden Maar sediments. https://doi.org/10.1594/PANGAEA.834778
  3. Fox, BRS; Wartho, J-A; Wilson, GS et al. (2014): Demagnetisation curves of anhysteretic remanent magnetisation (ARM) measurements from the Foulden Maar sediment core FH2. https://doi.org/10.1594/PANGAEA.834776
  4. Fox, BRS; Wartho, J-A; Wilson, GS et al. (2014): Isothermal remanent magnetisation (IRM) acquisition of Foulden Maar sediments (field group 1). https://doi.org/10.1594/PANGAEA.834779
  5. Fox, BRS; Wartho, J-A; Wilson, GS et al. (2014): Isothermal remanent magnetisation (IRM) acquisition of Foulden Maar sediments (field group 2). https://doi.org/10.1594/PANGAEA.834780
  6. Fox, BRS; Wartho, J-A; Wilson, GS et al. (2014): Isothermal remanent magnetisation (IRM) acquisition of Foulden Maar sediments (field group 3). https://doi.org/10.1594/PANGAEA.834781
  7. Fox, BRS; Wartho, J-A; Wilson, GS et al. (2014): Magnetic susceptibility measurements for the Foulden Maar cores. https://doi.org/10.1594/PANGAEA.834783
  8. Fox, BRS; Wartho, J-A; Wilson, GS et al. (2014): Thermal demagnetisation of three-component IRM of sample 22. https://doi.org/10.1594/PANGAEA.834785
  9. Fox, BRS; Wartho, J-A; Wilson, GS et al. (2014): Thermal demagnetisation of three-component IRM of sample 8. https://doi.org/10.1594/PANGAEA.834784
  10. Fox, BRS; Wartho, J-A; Wilson, GS et al. (2014): Thermal demagnetisation of three-component IRM of schist 4. https://doi.org/10.1594/PANGAEA.834786
  11. Fox, BRS; Wartho, J-A; Wilson, GS et al. (2014): Thermal demagnetisation of three-component IRM of schist 5. https://doi.org/10.1594/PANGAEA.834787