Thermal ionization mass spectrometry U-series dating of a hominid site near Nanjing, China

Application of sedimentary and chronological analyses to refine the depositional context of a Late Pleistocene vertebrate deposit, Naracoorte, South Australia

“…That is, the U is fixed within the speleothem calcite (or aragonite) during genesis. Thus, U/Th dating of speleothem will provide the true age of initial calcite crystallisation (Zhao et al, 2001;Prideaux et al, 2010). All teeth and straw stalactite samples were pre-treated and dated following techniques described in Zhao et al (2001), Yu et al (2006), Price et al (2009) andSt Pierre et al (2009).…”

Investigating fossil hydrothermal systems by means of fluid inclusions and stable isotopes in banded travertine: an example from Castelnuovo dell’Abate (southern Tuscany, Italy)

“…Samples (about 0.01 g powders) were completely dissolved using ultra-pure double-distilled concentrated HNO 3 mixed with a 229 Th-233 U spike. Hydrogen peroxide was added to the samples after digestion to remove any possible organic matter, and a new anion-exchange column chemistry procedure (modified after Edwards et al 1987;Zhao et al 2001;Clark et al 2012) was used to purify U and Th. Unlike the procedure commonly used in the past, in this modified procedure, U and Th are eluted together using ~3 ml of a 1 % HNO 3 + 0.03 % HF mixture.…”

Formation of fault-related calcite precipitates and their implications for dating fault activity in the East Anatolian and Dead Sea fault zones

“…U-series dating was carried out in the Radiogenic Isotope Laboratory at the University of Queensland following the analytical procedures described in Zhao et al (2001) and Yu et al (2006). Calcitepowdered samples were completely dissolved in concentrated HNO 3 with a mixed 229 Th -233 U-236 U spike.…”