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- W2296948120 abstract "Abstract Dating of late Pleistocene sediments remains a challenge in Quaternary chronology, due to the inherent limitations of the 14 C and OSL methods. The 230 Th/U radioisotope method is theoretically applicable to wood remnants contained within Pleistocene sediments, but few results have been pub-lished to date and in some cases, the age data are ambiguous. This paper tests the use of 230 Th/U da-ting of fossil wood remnants dated earlier by radiocarbon method. We analyzed a buried larch trunk from a well-known stump layer in the Lipovka outcrop, located on the Tobol River bank in Western Siberia. The stump layer is preserved in situ. We determined the specific activities of U and Th iso-topes in samples of both modern pine and fossil larch and proposed a model for the incorporation and distribution of U and Th in the buried wood during aging. Complications related with the recognition of geochemical closed systems with respect to U did not allow obtaining completely reliable 230 Th/U age. Despite this the 230 Th/U age obtained for the uppermost heartwood sample and 14 C ages of the same larch trunk and other wood and vegetation remnants gave consistent results. These age data in combination with previously obtained pollen data testify the stump layer formation during the late cooling stage of the Karganian time (MIS-3, Middle Valdai)." @default.
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- W2296948120 date "2015-07-11" @default.
- W2296948120 modified "2023-09-26" @default.
- W2296948120 title "Comparative 230Th/U and 14C Dating of a Buried Stump Layer (Western Siberia)" @default.
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- W2296948120 doi "https://doi.org/10.1515/geochr-2015-0016" @default.
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