Post by Pahu79 on May 31, 2012 11:27:57 GMT -5
Lead and Helium Diffusion
Lead diffuses (or leaks) from zircon crystals at known rates that increase with temperature. Because these crystals are found at different depths in the Earth, those at greater depths and temperatures should have less lead. If the Earth’s crust is just a fraction of the age claimed by evolutionists, measurable differences in the lead content of zircons should exist in the top 4,000 meters. Instead, no measurable difference is found (a).
Similar conclusions are reached based on the helium content in these same zircon crystals (b). Because helium escapes so rapidly and so much helium is still in zircons, they (and the Earth’s crust) must be less than 10,000 years old (c). Furthermore, the radioactive decay that produced all that helium must have happened quite rapidly, because the helium is trapped in young zircons.
a. “Taken together, these results strongly suggest that there has been little or no differential Pb loss which can be attributed to the higher temperatures existing at greater depths.” [/i]Robert V. Gentry et al., “Differential Lead Retention in Zircons: Implications for Nuclear Waste Containment,” Science, 16 April 1982, p. 296.
Robert V. Gentry, “Letters,” Physics Today, October 1982, pp. 13–14.
b. Robert V. Gentry, “Letters,” Physics Today, April 1983, p. 13.
c. “In fact, considering the Precambrian age of the granite cores, our results show an almost phenomenal amount of He has been retained at higher temperatures, and the reason for this certainly needs further investigation ...” [/i]Robert V. Gentry et al., “Differential Helium Retention in Zircons,” Geophysical Research Letters, Vol. 9, No. 10, October 1982, p. 1130.
Robert V. Gentry, personal communication, 24 February 1984.
D. Russell Humphreys et al., “Helium Diffusion Rates Support Accelerated Nuclear Decay,” Proceedings of the Fifth International Conference on Creationism (Pittsburgh, Pennsylvania: Creation Science Fellowship, Inc., 2003), pp. 175–195.
From “In the Beginning” by Walt Brown