A fundamental driving force behind these applications have been technological advances in mass spectrometry and micro-analytical technology, which have led to a steady reduction of sample size while increasing sample throughput at the same time.The technological evolution of the U-Th-He method can be broadly divided into three periods. alpha dating by some authors) stretches farther back than any other radioisotopic dating technique (Rutherford, 1905).It can arguably be interpreted as an allegory for the history of thermochronology in general, in which early, presumably nonsensical or inconsistent ages are later interpreted as geologically meaningful cooling ages in the context of additional kinetic and geologic constraints (e.g., see review in Reiners et al., 2005).The basic foundation of the technique is production of where the lambdas are the parental decay constants.
These ages are progressively reset by heating, due to the diffusive loss of the radiogenic helium (analogous to the annealing of fission tracks), with total loss occurring at temperatures around 80 to 90C (for timescales involving millions of years). The concept of He-diffusion in apatite assumes that the diffusion path (a) is the grain size.Therefore, the geometry (A) of the mineral grain is very important (Meesters and Dunai, 2002a, b)., in association with CSIRO Division of Petroleum Resources, Sydney, is pleased to announce this new addition to our range of thermal history reconstruction (THR) services. Reliable reconstruction of thermal histories in sedimentary basins is a key aspect of reducing exploration risk, e.g.