2:15 PM - 2:30 PM
[BPT05-03] The Hadean environment inferred from mineral inclusions within the oldest terrestrial zircons
Keywords:Hadean, zircon, mineral inclusion
To overcome this, we have developed rapid and precise dating technique using laser ablation ICP-mass spectrometer (LA-ICP-MS). Mineral inclusions in the zircons were investigated using laser Raman microspectroscopy, equipped with high-speed Raman mapping system. Our preliminary results show that primary apatite and melt inclusions are successfully recovered from zircons of over 4.0 Ga out of 3000 checked grains. The chemistry of apatite and melt inclusions are commonly utilized to characterize host rock, missing Hadean crust. Combination of rapid U-Pb dating with LA-ICP-MS and mineral identification with laser Raman leads us to trace a missing Hadean environment from the oldest zircon of the Earth.
 Compston, W. and Pidgeon, R.T., 1986, Nature, 321, 766-769.  Wild, S.A, Valley, J.W., Peck, W.H., and Graham, C.M., 2001, Nature, 176-178.  Hopkins, M., Harrison, T.M., and Manning, C.E., 2009, Nature, 456, 493-49.  Harrison, T.M., 2009, Annu. Rev. Earth Planet. Sci., 37, 479-505.  Bell, E.A., Boehnke, P., Harrison, T.M., and Mao W.L., 2015, PNAS, 112, 144158-14521.  Tarduno, J.A., Cottrell, R.D., Davis, W.J., Nimmo, F., and Bono, R.K., 2015, Science, 349, 521-524.  Jennings E.S., Marshcall, H.R., Hawkesworth, C.J., and Storey, C.D., 2011, Geology, 39, 863-866.  Holden, P., Lanc, P., Ireland, T.R., Harrison, T.M., Foster, J.J., and Bruce, Z., 2009, Int. Jour. Mass Spectrometry, 286, 53-63.  Rasmussen B., Fletcher, I.R., Muhling, J.R., Gregory, C.J., and Wild, S.A., 2011, Geology, 39, 1143-1146.