Rb sr method of dating
Rb sr method of dating - francis boulle and sophia dating
However, this sampling technique was known by mainstream geologists to behave in this manner long before Austin published on the topic, and this behavior is often intentionally used by geologists.
Furthermore, the half-life is far too long for any practical hydrologic application.In this article I shall point out some other dating methods which work the same way as the Rb-Sr method.The reader who has not read the article on the Rb-Sr method will find this present article almost completely incomprehensible, and should go back and read it.In fact, the resulting age in this case may well be meaningful and accurate.The problem is not the age itself but rather Austin's sleight-of-hand in trying to pass off the result as necessarily the age of the flows rather than a minimum age of their source.The geological relationships of the various formations are quite clear.
The lava flows which spill into the canyon must be younger than the canyon.Even young-earth creationists would agree with this relative sequencing of events.They would argue for a much shorter absolute timescale than mainstream geologists would accept, but the relative sequence is agreed upon by all parties. Steven Austin, chairman of the Geology Department at the Institute for Creation Research, claimed (1992) that he had derived an isochron for the plateau flows, which indicates an age of about 1.3 billion years. During fractional crystallization, Sr tends to be come concentrated in plagioclase, leaving Rb in the liquid phase.Hence, the Rb/Sr ratio in residual magma may increase over time, resulting in rocks with increasing Rb/Sr ratios with increasing differentiation. If the initial amount of Sr is known or can be extrapolated, the age can be determined by measurement of the Rb and Sr concentrations and the Sr ratio.A figure expressible in billions of years is ideal.