87sr/86sr dating, (including isotope geoscience)
There are no neutron reactions that produce the same result as either beta 87sr/86sr dating alpha decay. As a result, glauconite is used for dating only with extreme caution.
The reasons for this are that 87sr/86sr dating forces act over distances much smaller than the distances between nuclei, and that the amounts of energy involved in nuclear transformations are much greater than those involved in normal chemical reactions or normal physical conditions.
These are K-Ar data obtained on glauconite, a potassium-bearing clay mineral that forms in some marine sediment.
For example, in Why dating tips dont work first edition of his monograph on radiometric dating, Slusher claims that the decay rate of 57Fe has been changed by as much as 3 percent by electric fields; however this is an IC decay, and 57Fe remains Fe.
The study of the Liberian diabase dikes, discussed above, is a good example of this practice. Mineralogicheskoye Obshchestvo Zapiski, v. It commonly substitutes for calcium in calcium minerals, such as the plagioclase feldspars. As in the Ruteh Limestone, the deeper-water setting of this formation, especially in its Capitanian part, may have been associated with lower temperature implying the low occurrences of fusulinids.
Internal structure and conditions of formation, Solar System Research, v. We can only speculate on where Kofahl and Segraves obtained their numbers.
The scatter of the data in Figure 6 shows clearly that the sample has been an open system to 87Sr and perhaps to other isotopes as well and that no meaningful Rb-Sr age can be calculated from these data. Because they have no charge and little or no mass, neutrinos do not interact much with matter — most pass unimpeded right through the Earth — and they can be detected experimentally only with great difficulty.
This renders the RbSr87 series useless as a clock.
Zapiski Vsesoyuznoge Mineralogicheskogo Obshchestva, v. Towards a recognised standard, Spectrochimica Acta - Part A: Even though the various minerals will incorporate different amounts of Sr as they cool and form, the Sr isotopic composition will be the same because natural processes do not significantly fractionate isotopes with so little mass difference as 87Sr and 86Sr.
Thousands of genera Phanerozoic biodiversity as shown by the fossil record Mass extinctions are thought to result when a long-term stress is compounded by a short term shock.
It is speculated that massive volcanism caused or contributed to the End-PermianEnd-Triassic and End-Cretaceous extinctions. Thus it would seem that a large amount of Ar40 was present in the beginning. No sources for Australasian or North-American tektites abstract.
For example, lavas taken from the ocean bottom off the island [sic] of Hawaii on a submarine extension of the east rift zone of Kilauea volcano gave an age of 22 million years, but the actual flow happened less than years ago.
The statement by Rofahl and Segraves 77 is simply unjustifiable. The 87sr/86sr dating cutting the Precambrian basement gave K-Ar ages ranging from to million years Woodmorappe erroneously lists this higher age as million yearswhereas those cutting the Mesozoic sedimentary rocks gave K-Ar ages of from to million years.
He has used an invalid analogy and come to an erroneous conclusion.
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