Rowe, P. J. and Maher, B. A. (2000) Cold stage formation of calcrete nodules in the Chinese Loess Plateau: evidence from U-series dating and stable isotope analysis. . Palaeogeography, Palaeoclimatology, Palaeoecology, 157 (1-2). pp. 109-125. ISSN 0031-0182Full text not available from this repository.
This pilot study shows that some calcrete nodules from the base of palaeosols in the Chinese loess sequences can be dated by U-series isochron methods. The ages obtained suggest that the nodules did not form during interglacial climate stages; rather, they formed either during interglacial/glacial transitions or glacial climate stages. Thus, the nodules appear not to have formed contemporaneously with the soils beneath which they immediately lie but significantly post-date them. Post-pedogenic injection of carbonate into stratigraphically lower horizons is therefore identified. This finding contradicts previous assumptions regarding the timing of nodule formation. Carbon and oxygen isotope analyses of the nodules identify isotopic compositions which independently suggest that climatic conditions cooler and possibly drier than at present prevailed at the time of nodule formation.
|Journal or Publication Title:||Palaeogeography, Palaeoclimatology, Palaeoecology|
|Uncontrolled Keywords:||calcrete nodules ; Chinese loess ; palaeosol ; stable isotopes ; uranium series dating|
|Subjects:||G Geography. Anthropology. Recreation > G Geography (General)|
|Departments:||Faculty of Arts & Social Sciences > Law School|
Faculty of Science and Technology > Lancaster Environment Centre
|Deposited By:||Professor Barbara A Maher|
|Deposited On:||02 Jan 2007|
|Last Modified:||04 Nov 2015 01:04|
Actions (login required)