Age dating

SWS are useful to obtain direct indications of hydrocarbons (under UV light) and to differentiate between oil and gas. The technique is applied extensively to sample microfossils and pollen for stratigraphic analysis (age dating, correlation, depositional environment). Qualitative inspection of porosity is possible, but very often the sampling process results in a severe crushing of the sample thus obscuring the true porosity and permeability. 

ACCESSORY MINERAL GRAINES AS A TOOL FOR THEIR TOTAL Pb AGE DATING... 

Salamatin, A. N., Lipenkov, V. Y., Barkov, N. I. et al. (1998). Ice core age dating and paleothermometer calibration based on isotope and temperature profiles from deep boreholes at Vostok Station (East Antarctica). /. Geophys. Res. 103(D8), 8963-8977. 

In 1988, the Shroud of Turin, claimed by some to have been used to bury Christ, was age-dated by isotopic... 

It seems clear by comparing Fig. 1.159 with Table 1.26 that the ages of hydrothermal mineralization and alterations determined by K-Ar age dating are consistent with those of sedimentary rocks affected by hydrothermal activity in the Oga. Hydrothermal activities were intense at ca. 14-13 Ma, 12.6 Ma, 10.5 Ma, and 8.2 Ma. 

Martinson DG, Pisias NG, Hays JD, Imbrie J, Moore TC, Shackleton NJ (1987) Age dating and the orbital theory of the Ice Ages Development of a high-resolution 0 to 300,000 yr chronostratigraphy. Qrrat Res 27 1-29... 

Amino Acid Dating Techniques depend on the "rates of hydrolysis reactions of proteins and racemization, epimerization, and decomposition reactions of amino acids [they have] been applied to the age-dating of fossil bone, teeth, and shell. Activation energies range from near 20 kcal per mole for hydrolysis reactions to around 30 kcal per mole for racemization... 

The basic idea in radioactive age-dating of rocks (from the Earth, Moon and meteorites) is to find the ratio of daughter to parent in an isolated system. Thus the age inferred is usually the solidification age which is the time since the last occasion when chemical fractionation was halted by solidification. (K-Ar dating gives a gas-retention age which can be slightly shorter.)... 

Busenberg, E. Plummer, L.N. 1992. Use of chlorofluorocarbons (CCI3F and CCI2F2) as hydrologic tracers and age dating tools the alluvium and terrace system of Central Oklahoma. Water Resources Research, 28, 2257-2283... 

AgBr, light sensitivity of, 19 360. see also silver bromide AGDOC service, 18 244 Age. See also Aging Dating influence on toxicity, 25 212 using radioactive decays to determine, 21 316... 

Hayek et al. (1990) reported the identification of 14 samples of birch bark tar of Chalcolithic to Early Iron Age date from sites in Austria and Denmark. In this study, authentic tars from bark samples of a number of different species (e.g., birch, oak, alder, hazel, elm and so on) were produced under laboratory conditions (using Kugelrohr distillation) and compared with the aged samples... 

AGE DATING OF NAPL POOLS AND DISSOLVED HYDROCARBON PLUMES... 

Summary of Age Dating Techniques for Dissolved Hydrocarbon and Organic Plumes... 

Tritium (3H) and cesium (137Cs) are common isotopes used for age dating of groundwater. The rationale behind the use of these two isotopes is the assumption that above background levels are the result of their introduction from the atmospheric testing of thermonuclear devices from about 1953 to 1954. Since 1953 to 1954, tritium and cesium levels increased to about 1963, then declined with secondary increases or peaks around 1973 and 1975 reflecting testing done by China and France. 

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