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Dating mineral grains

ACCESSORY MINERAL GRAINES AS A TOOL FOR THEIR TOTAL Pb AGE DATING... [Pg.436]

Laser Microprobe Argon-39—Argon-40 Dating of Individual Mineral Grains... [Pg.143]

Sutter J. F. and Hartung J. B. (1984) Laser microprobe "" Ar/ Ar dating of mineral grains in situ. Scan. Electr. Micros. 4, 1525-1529. [Pg.1553]

Cheburkin A. K., Frei R., and Shotyk W. (1997) An energy-dispersive miniprobe multi-element analyzer (EMMA) for direct analysis of trace elements and chemical age dating of single mineral grains. Chem. Geol. 135, 15-Zl. [Pg.1603]

Improvements in the technology of analytical instruments that have occurred since the measurements in Table 19.5 were made permit individual mineral grains to be dated by the Rb- Sr, Ar/ Ar, and U-Pb methods. The crystallization ages of selected mineral grains in till... [Pg.710]

The time-frame for georeactor demise is yet unknown, principally because at present there is no known way to date the time of formation of the helium. In addition, measurement of just a few mineral grains separated from samples taken from large volcanic structures statistically limits inferences. [Pg.2213]

Rock-fall and rock-avalanche deposits can be dated cosmogenically ( Luminescence Dating in Paleoseismology) if the surface of the deposit has been relatively stable since the time of emplacement. This method measures the amount of time that specific types of mineral grains have been exposed to cosmic radiation. The assumption is that a significant proportion of the material on the surface of a rock-fall or rock-avalanche deposit was newly fractured and exposed when the landslide occurred. [Pg.1802]

Luminescence measurements are used to estimate the radiation dose to which the mineral grains have been exposed since the event being dated—the equivalent dose (ED), or palaeodose (P) in Eq. (1). Since there is no intrinsic relationship between radiation dose and the luminescence signal subsequently measured, each sample requires individual calibration. Two basic approaches have been used to determine the ED additive dose and regenerative dose (Fig. 2). [Pg.314]

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See also in sourсe #XX -- [ Pg.139 , Pg.140 , Pg.141 , Pg.142 , Pg.143 , Pg.144 , Pg.145 , Pg.146 ]



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