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7 thGeochemistry Sympossium, Antalya, Turkey, 16 - 18 May 2016, pp.177, (Summary Text)
Whereas the dating of travertine deposits at 103 to 106 yr time scales through 230Th/234U and 234U/238U disequilibria is currently done, mostly for the documenting of travertine deposition and groundwater/hydrothermal seepage in relation to late Pleistocene and Holocene climatic changes (i.e., at Milankovitch time window), a much lesser attention has been paid to much shorter and more recent time scale evolution of these processes. These can be documented using shorter-lived isotopes of both 232Th and 238U series, as illustrated in the figure below. Short-lived isotopes of these series provide insights into 103 to 10-2 yr time scales. Access ttheserecent time windows is essential for precise assessments of preanthropocene vs anthropocene changes in geodynamics processes, thus for the documenting of anthropic and global warming impacts on such processes. Here, aside the dating of Pleistocene and Holocene intervals characterized by intense travertine deposition in the Pamukkale and Antalya areas, we investigated changes in ground- and surface water chemical properties and budgets, as recorded by recent and on-going travertine deposition at both sites, through their 230Th/226Ra, 226Ra/210Pb, 232Th/228Ra/228Th, 210Po/210Pb disequilibria. Seven carbonate samples the age of which ranging from the Last Glacial Maximum to present, and two water samples were collected in the Pamukkale area. Thirty-two carbonate samples, the age of which ranging from earlier Interglacials to present, one suspended particulate matter sample, and ten water samples were collected in the Antalya area. Sampling and analytical procedures required for the measurements of the whole array of isotopes will be presented and preliminary results on 210Po/210Pb measurements will illustrate their potential use for the documenting of seasonal-timing changes in carbonate depositional rates.