Examples of radiometric

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A temporal framework for pollen data is provided by radiometric dating or a stratigraphic context for the pollen-bearing sediments.
The large variation in degree of deformation, grade of metamorphism, and radiometric ages suggest syn-spreading extensional deformation at a slow-spreading ridge.
From the available radiometric data they estimated the missing interval in the south to represent at least several million years.
In some cases, however, the acquisition of radiometric data implying later cooling and unroofing may prove the previous identification of a nonconformity to be erroneous.
There are data-rich compilations of radiometric ages and isotopic compositions that will be useful resources for years to come.
Eventually, the radiometric data may seem to conflict with the minimum age of unroofing indicated by older nonconformable sediments.
Following the introduction there are three chapters devoted to radiometric techniques, with radiocarbon covered in the greatest detail with its own dedicated chapter.
The pitfalls of not separating the finest and purest phases for radiometric dating are emphasized: inherited material will give 'non-metamorphic' ages.
Three important conclusions may be drawn from the stratigraphic and radiometric results.
In such a case, the acquisition of radiometric data in both metamorphic units may ultimately be the only way to establish their contrasting exhumation histories.
As a result, the obtained radiometric dates have no bearing on the timing of exhumation (that is, ages are underestimated).
They will not, therefore, be used in this present paper where more precise radiometric ages and stratigraphic correlations are needed.
The large variation in degree of deformation, grade of metamorphism, and radiometric ages suggests syn-spreading extensional deformation at a slow-spreading ridge.
Short final chapters on radiometric methods and drilling and borehole logging complete the book.
Traditional biostratigraphical control is usually provided by calcareous nannoplankton and foraminifers, and only a few sites have stratigraphical control through magnetostratigraphy or radiometric dating.
This sum gives the total photometric value of light assuming a flat electromagnetic spectrum, that is, flat radiometric spectrum.
Precambrian tillites generally lack radiometric age constraints sufficient for correlation of glacial episodes.
Initial ratios were calculated using available radiometric ages.
In addition to the soil background, several parameters in-uence the radiometric response of a plant canopy.

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