Invited Speakers

Andre Sawakuchi

Andre Sawakuchi

Institution: Institute of Gesciences, University of São Paulo, Brazil

Title: Natural controls on the luminescence sensitivity of quartz and its application to source-to-sink sedimentary systems

André Oliveira Sawakuchi is an Associate Professor at the Institute of Geosciences, University of São Paulo (IGc-USP). He leads the Luminescence and Gamma Spectrometry Laboratory at IGc-USP and his main interest is the study of source-to-sink sedimentary systems and their response to climate changes. Under this perspective, the reconstruction of Neogene and Quaternary landscapes shaped by large rivers in tropical South America is of particular interest. Luminescence methods applied to quartz have a key role for this research theme. In the last few years, André Sawakuchi has studied the natural variability of the optically stimulated luminescence (OSL) and thermoluminescence (TL) characteristics of quartz to understand the luminescence sensitization of quartz grains under the action of Earth surface processes. This is motivated by the development of sediment provenance proxies applied to quartz-rich sedimentary deposits and expand the applications of OSL and TL methods to Earth Sciences.

Read More

Selected Publications:

  • Nascimento, D.R., Sawakuchi, A.O., Guedes, C.C.F., Giannini, P.C.F., Grohmann, C.H., Ferreira, M.P. 2015. Provenance of sands from the confluence of the Amazon and Madeira rivers based on detrital heavy minerals and luminescence of quartz and feldspar. Sedimentary Geology 316, 1-12.
  • Sawakuchi, A.O., Guedes, C.C.F., DeWitt, R., Giannini, P.C.F., Blair, M.W., Nascimento Jr. D.R., Faleiros, F.M. 2012. Quartz OSL sensitivity as a proxy for storm activity on the southern Brazilian coast during the Late Holocene. Quaternary Geochronology 13, 92-102.
  • Sawakuchi, A.O., Blair, M.W., DeWitt, R., Faleiros, F.M., Hyppolito, T.N., Guedes, C.C.F. 2011. Thermal history versus sedimentary history: OSL sensitivity of single quartz grains extracted from igneous and metamorphic rocks and sediments. Quaternary Geochronology 6, 261-272.
  • Zular, A., Sawakuchi, A.O., Guedes, C.C.F., Giannini, P.C.F. 2015. Attaining provenance proxies from OSL and TL sensitivities: Coupling with grain size and heavy minerals data from southern Brazilian coastal sediments. Radiation Measurements 81, 39-45.
Georgina King

Georgina King

Institution: Institute of Geological Sciences, University of Bern, Switzerland

Title: Luminescence thermochronometry: theory, applications and future directions

Georgina King is a Research Fellow in the Institute of Geological Sciences at the University of Bern, Switzerland. She is interested in the application of luminescence dating to geomorphological questions, as well as understanding the fundamental processes of luminescence within quartz and feldspar minerals. Over the past few years, Georgina has been working almost exclusively on the development and application of luminescence thermochronometry in collaboration with colleagues from the Universities of Lausanne and Wageingen. She has held research positions in the UK, Germany and Switzerland.

Read More

Selected Publications:

  • G.E. King, B. Guralnik, P.G. Valla, F. Herman, 2016. OSL-thermochronometry: a status review on its development, application and future outlook. Chemical Geology 446, 3-17.
  • G.E. King, F. Herman and B. Guralnik, 2016. Northward migration of the eastern Himalayan syntax revealed by OSL-thermochronometry. Science 353 (6301), 800-804.
  • G.E. King, F. Herman, R. Lambert, P.G. Valla, B. Guralnik, 2016. Multi-OSL-thermochronometry of feldspar. Quaternary Geochronology 33, 76-87.
  • J.A. Durcan, G.E. King, G.A.T. Duller, 2015. DRAC: An online Dose Rate and Age Calculator. Quaternary Geochronology 28, 54-61.
  • G.E. King, A.A. Finch, R.A.J. Robinson & D.E. Hole, 2011. The problem of dating quartz 1: fundamentals of cumulative dose dependence. Radiation Measurements 46(1), 1-9.
Makaiko Chithambo

Makaiko Chithambo

Institution: Department of Physics and Electronics, Rhodes University, South Africa

Title: Time-resolved optically stimulated luminescence: Principles and developments

Makaiko Chithambo is a Professor of physics and head of the Department of Physics and Electronics at Rhodes University, Grahamstown, South Africa. His main research interest is the study of mechanisms of luminescence in materials using time-resolved optical stimulation for which he has developed instrumentation, theory and analytical methods. Dr Chithambo has used the technique to study quartz, feldspar and α-Al2O3:C addressing a wide range of questions including the influence of annealing, thermal history, and the link between sensitivity and luminescence lifetimes in quartz and also developing analytical methods for studying the influence of measurement temperature on lifetimes and luminescence throughput in α-Al2O3:C. Makaiko Chithambo also has a long-standing interest in the use of conventional thermoluminescence and thermoluminescence spectra to understand physical processes of luminescence in materials and has studied a wide range of natural and synthetic materials including beryl, carbonatite, polyethylene, quartz, SrAl2O4:Eu2+, Dy3 , α-Al2O3:C and α-Al2O3:C,Mg. On the over-arching theme of point-defects in solids, he also collaborates with others to exploit the utility of allied methods such as positron annihilation and the like.

Read More

Selected Publications:

  • Chithambo, M.L., Costin, G., 2017. Temperature-dependence of time-resolved optically stimulated luminescence and composition heterogeneity of synthetic α-Al2O3:C. J. Lumin. 182, 252-262.
  • Chithambo, M.L., Nyirenda, A.N., Finch, A.A., Rawat, N.S., 2015. Time-resolved luminescence and spectral emission features of α-Al2O3:C. Physica. B: Condens. Matter. 473, 62-71.
  • Preusser, F., Chithambo, M.L., Götte, T., Martini, M., Ramseyer, K., Sendezera, E.J., Susino, G.J. and Wintle, A.G. 2009. Quartz as a natural luminescence dosimeter. Earth-Science Reviews. 97, 196 – 226.
  • Chithambo, M.L., Ogundare, F.O., 2009. Luminescence lifetime components in quartz: influence of irradiation and annealing. Radiat. Meas. 44, 453 - 457.
  • Chithambo, M.L., 2007. The analysis of time-resolved optically stimulated luminescence. I: Theoretical considerations. J. Phys. D.: Appl. Phys. 40, 1874-1879.
Reza Sohbati

Reza Sohbati

Institution: Nordic Laboratory for Luminescence Dating, Aarhus University, Denmark

Title: Optical Dating of Rock Surfaces’

Reza Sohbati is a postdoctoral researcher at the Nordic Laboratory for Luminescence Dating, Aarhus University, Risø, Denmark. He completed his PhD at Aarhus University and his MSc at Tehran University, Iran. His primary research interest lies in the development of a new rock-surface dating technique based on luminescence. This involves measuring and modelling luminescence-depth profiles beneath the rock surfaces to decipher their depositional history. Reza is currently working on a project funded by the Danish Council for Independent Research (FNU) to further expand the application of the new rock-surface dating technique to mass-movement deposits such as debris flows, rock falls and landslides in Tibet, China and similar mountainous areas around the world.

Read More

Selected Publications:

  • Sohbati, R., Murray, A. S., Porat, N., Jain, M., Avner, U. 2015. Age of a prehistoric “Rodedian” cult site constrained by sediment and rock surface luminescence dating techniques. Quaternary Geochronology 30, 90–99. DOI: 10.1016/j.quageo.2015.09.002.
  • Sohbati, R. 2013. Luminescence, Rock Surfaces. Encyclopedia of Scientific Dating Methods. Springer. Invited paper. DOI: 10.1007/978-94-007-6326-5.
  • Sohbati, R., Murray, A.S., Chapot, M.S., Jain, M., Pederson, J.L. 2012. Optically stimulated luminescence (OSL) as a chronometer for surface exposure dating. Journal of Geophysical Research-Solid Earth 117, B09202. DOI: 10.1029/2012JB009383.
  • Sohbati, R., Murray,, A.S., Jain, M. 2012. Surface exposure dating of non-terrestrial bodies using optically stimulated luminescence: A new method. Icarus 221, 160–166. DOI: 10.1016/j.icarus.2012.07.017.
  • Sohbati, R., Murray, A.S., Jain, M., Buylaert, J.-P., Thomsen, K.J. 2011. Investigating the resetting of luminescence signals in rock surfaces. Geochronometria 38, 249–258. DOI: 10.2478/s13386-011-0029-2.
Shenghua Li

Shenghua Li

Institution: Department of Earth Sciences, University of Hong Kong

Title: Maximum age limitations in optical dating

Sheng-Hua Li completed his BSc at Lanzhou University, China in 1983 and graduated with a PhD from the University of Wales, Aberystwyth, UK in 1992. His interest in luminescence goes back a long way, 1984 to be exact, when he started TL dating of loess in China. Sheng-Hua has studied and worked in Laboratories of Zhengding, Oxford, Aberystwyth and The University of Hong Kong. He has the distinction of having attended all LED conferences since the 1987 one held in Cambridge.

Read More

Selected Publications:

  • Fan A.C., Li S.-H., Li B. (2011) Observation of unstable fast component in OSL of quartz. Radiation Measurements 46, 21-28.
  • Li B., Li S.-H. (2012) Luminescence dating of Chinese Loess beyond 130 ka using the non-fading signal from K-feldspar. Quaternary Geochronology 10, 24-31.
  • Li B. and Li S.-H., (2011) Thermal stability of infrared stimulated luminescence of sedimentary K-feldspar. Radiation Measurements 46, 29-36.
  • Li B., Roberts R.G., Jacobs Z., Li S.-H. (2013). Extending the age limit of luminescence dating using the dose-dependent sensitivity of MET-pIRIR signals from K-feldspar. Quaternary Geochronology, 17, 55-67.
  • Chen Y.W., Li S.-H., Li B., Hao Q.Z., Sun J.M. (2015) Maximum age limitation in luminescence dating of Chinese loess using the multiple-aliquot MET-pIRIR signals from K-feldspar. Quaternary Geochronology 30, 207-212.
Sumiko Tsukamoto

Sumiko Tsukamoto

Institution: Leibniz Institute of Applied Geophysics, Germany

Title: Characteristics of quartz ESR signals and their relevance in dating and thermochronology

Dr. Sumiko Tsukamoto works at the Geochronology and Isotope Hydrology Section at Leibniz Institute of Applied Geophysics, Hannover, Germany and manages the Luminescence and ESR laboratories. Since the completion of her PhD in ESR she has become one of the very few specialists who actively conduct both luminescence and ESR research and publish widely in both fields. In luminescence she has been involved in the development of the pulsed OSL/IRSL and post-IR IRSL dating methods and specialises in the area of dating volcanic rocks. In ESR she developed the ESR SAR protocol for quartz.

Read More

Selected Publications:

  • Tsukamoto, S., Rades, E.F. (2016). Performance of pulsed OSL stimulation for minimising the feldspar signal contamination in quartz samples. Radiation Measurements, 84, 26-33.
  • Tsukamoto, S., Toyoda, S., Tani, A., Oppermann, F. (2015). Single aliquot regenerative dose method for ESR dating using X-ray irradiation and preheat. Radiation Measurements, 81, 9-15.
  • Oppermann, F., Tsukamoto, S. (2015). A portable system of X-ray irradiation and heating for electron spin resonance (ESR) dating. Ancient TL, 33, 11-15.
  • Tsukamoto, S., Kataoka, K.S., Oguchi, T., Murray, A.S., Komatsu, G. (2014). Luminescence dating of scoria fall and lahar deposits from Somma Vesuvius, Italy. - Quaternary Geochronology, 20, 39-50.
  • Tsukamoto, S., Murray, A.S., Ankjærgaard, C., Jain, M., Lapp, T. (2010). Charge recombination process in minerals studied by optically stimulated luminescence and time-resolved exo-electron emission. Journal of Physics D: Applied Physics 325502 (9pp).