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(PDF) U-Th dating of deep-sea corals | Jess Adkins - einmischen.info
The U-series laboratory focuses on development and application of U-series dating techniques to provide a robust chronological framework for palaeoclimatology, archaeology and human evolution. The U-series disequilibrium method is based on the radioactive decay of radionuclides within the naturally occurring decay chains. There are three such decay chains, each starts with an actinide nuclide U, U, Th having a long half live and ultimately ends with different a stable isotope of lead. U-Th dating can be applied to secondary calcium carbonate formations like speleothems , travertine or corals. For dating e.
Abstract This paper presents a significantly simplified method for in-situ U-Th-He dating removing the need to know any absolute concentrations or ablation pit volumes. We introduce an LA-ICP-MS-based method to correct for variable ablation depths between the standard and the unknown, using the strength of the ablated 29 Si signal. Finally, we propose a pseudo-depth profile method to assess the effects of compositional zoning on the accuracy of in-situ U-Th-He data. The effectiveness of the proposed method has been demonstrated on three samples of gem-quality Sri Lanka zircon, which yield ages that are in agreement with previously published conventional U-Th-He measurements. This radioactive decay forms the basis of the U-Th-Pb and U-Th-He methods of geochronology, each of which have different geological significance.