Talk:Isochron dating

message: In this section it says "As time goes on, some amount of the parent decays into the radiogenic isotope of the daughter, increasing the ratio of the concentration of the radiogenic isotope to that of the daughter."  This seems wrong to me, or am I mistaken? Dan Watts 04:58, 9 August 2005 (UTC)
thread_title:  Basis for method 

message: Nothing in the introduction of the article or the "basis for the method" section actually states what isochron dating is or how it determines what it does.  All we're told is that it's a dating method, and the basis section lists facts without describing what the method does or how it follows from them.  The only definition is the equation, which without context is useless for even a technical audience.Fyedernoggersnodden (talk) 04:34, 4 April 2012 (UTC)
thread_title:  No description of the process is given 

message: Since the ratio of the daughter and non-radiogenic isotopes is proportional to the ratio of the parent and non-radiogenic isotopes, the slope of the isochron gets steeper with time.
This does not look correct to me. the ratio of the daughter and non-radiogenic isotopes is proportional to the ratio of the parent and non-radiogenic isotopes has the slope of the isochron as the proportionality constant. This does not show that the slope of the isochron increases, it is just the formula for that slope in words. It would seem to me that from the isochron equation in the article: the slope should be (delta P) / (P - delta P) from the equation, and so the slope increases as delta P increases from that equation, and is zero when the rock is formed at delta P equal to zero. I don't see a way without using the isochron equation to determine this. Someone with better understanding of this than I might want to look at this sentence.69.231.139.172 (talk) 09:41, 31 May 2012 (UTC)
thread_title:  Article unclear regarding isochron slope change over time 

message: The change in slope from initial conditions--assuming an initial isochron slope of zero (a horizontal isochron) at the point of intersection (intercept) of the isochron with the y-axis--to the current computed slope gives the age of the rock. The slope of the isochron, \Delta{P}_t \over P-\Delta{P}_t, represents the ratio of daughter to parent as used in standard radiometric dating.
The above says that the change in slope gives the age of the rock, which is confusing because this slope is not in time units etc. The following sentence regarding using this slope for formula in standard radiometic dating indicates that it does not directly give the age of the rock, but that it may be used to to determine the age. I suspect that the word gives above could be changed to is used to determine to clear up this confusion. Perhaps someone with a better understanding of this than I would like to make this change. 69.231.139.172 (talk) 09:56, 31 May 2012 (UTC)
thread_title:  Using isochron to determine the age 

message: This whole page seems to have taken major step backwards when 'GeoGreg' made it much more complicated than it needed to be in 2005.
Speaking as someone who uses isochrons nearly every day, this page does not relate to the real world and needs to be completely rewritten, perhaps by reverting to the version before GeoGreg (who seems to have removed himself).  — Preceding unsigned comment added by Radiogenic (talk • contribs) 15:43, 23 September 2015 (UTC)
thread_title:  Notice that this page needs to be rewritten