Skip to menu

XEDITION

Board

The Radiometric Dating Game

RKSDonnie344465 2024.12.03 17:29 Views : 2

1062

This is significant because it is known that neutrinos do interact with the nucleii of atoms, and it is also believed that much of the energy of supernovae is carried away by neutrinos. Back to top Isochrons are an attempt to avoid the need for an absence of daughter element initially in computing radiometric ages. The idea is that one has a parent element, X, a daughter element, Y, and another isotope, Z, of the daughter that is not generated by decay. One would assume that initially, the concentration of Z and Y are proportional, since their chemical properties are very similar. Z By taking enough measurements of the concentrations of X, Y, and Z, publ.icwordtiredplan.e.s.j.a.d.e.d.i.m.p.u we can solve for c1 and c2, and from c1 we can determine the radiometric age of the sample. Let’s apply this to potassium argon dating, where X is K40, Y is Ar40, and Z is probably Ar36.


If the concentration of K varies in a rock, that it is unlikely for the concentration of added argon 40 to vary in a way that will yield an isochron. But if the concentration of K does not vary, then one can still get an isochron if the concentration of the non-radiogenic isotope Ar36 of the daughter product varies. So let’s call an isochron a "super-isochron" if the concentration of the parent element varies from one sample to another. Let’s call it a "wimpy isochron" otherwise. The question is, what percentage of isochrons are super-isochrons, and how do their dates agree with the conventional dates for their geologic period? I would think that it may be rare to have a super-isochron. If one is dealing with minerals that exclude parent or daughter, then one cannot get an isochron at all. If one is dealing with minerals that do not exclude parent and daughter elements, then most likely the parent element will be evenly distributed everywhere, and one will have a wimpy isochron that cannot detect added daughter product, and thus may give unreliable ages.


Whole rock isochrons may also tend to be wimpy, for the same reason. Even super isochrons can yield ages that are too old, due to mixings, however. False K-Ar isochrons can be produced if a lava flow starts out with a lot of excess Ar40 which becomes well mixed, along with potassium. Then while cooling or afterwards, a mixture of Ar36 and Ar40 can enter the rock, more in some places than others. Other isotopes of argon would work as well. I believe that this will produce a good K-Ar isochron, but the age calculated will be meaningless. There is another way that false isochrons can be produced. For a wimpy isochron, say a K-Ar isochron, we can assume that initially there is a uniform concentration of K everywhere, and concentrations of Ar40 and Ar36 that form an isochron. Then a lot of Ar40 enters, uniformly, through cracks in the rock or heating. Th is was c​re ated wi th GSA ​Conten​t ​Gene​rato r DE MO!


This will retain the isochron property, but will make the isochron look too old. My reasoning was that if the lava is thoroughly mixed, then the concentration of parent material should be fairly constant. If the concentration of parent substance is not constant, it could indicate that the lava is not thoroughly mixed. Or it could have other explanations. If the lava is not thoroughly mixed, it is possible to obtain an isochron from the mixing of two different sources, in which case the radiometric age is inherited from the sources, and does not necessarily yield the age of the flow. Someone pointed out to me that many Rb-Sr isochrons are super isochrons. I find this information very interesting, and thank him for it. I’d be curious to know which strata they occur in, as my main interest is the geologic column of Cambrian and above. My impression is that these are not on this part of the geologic column. And how well do the dates correlate with others for the same formation? This po st was w​ri tt en  with the he᠎lp of G SA Conten t  Ge​nerator DEMO᠎!

No. Subject Author Date Views
85080 Группы Телеграм По Городам России new DorieCornett59836809 2024.12.05 0
85079 Solar Power Information And Facts new CandyDeChair5635476 2024.12.05 0
85078 Live Guidance & Support new VernBiddell679867 2024.12.05 2
85077 Compare The Best Texas Electricity Rates & Energy Plans new Royal47E59888337367 2024.12.05 0
85076 CollagenC Immune Booster Shot Alfa Vitamins Store new MelaineMcgrath21 2024.12.05 0
85075 Advantages, Adverse Effects And Dosage Forbes Health And Wellness new MarisaSmith029715 2024.12.05 0
85074 Доски Объявлений России new NormaSlaton6722 2024.12.05 0
85073 Switching Energy When Moving House new ErickLittleton3 2024.12.05 2
85072 Straightforward Conformity Automation For Organizations new OnaCorin5177755449 2024.12.05 0
85071 Paper Bags With Handles new CindyR38857702844629 2024.12.05 2
85070 Ideal Quantum Computer Courses Online With Certificates 2024 new DougGarretson7856659 2024.12.05 2
85069 The Best KN95 Masks For Kids, According To Experts new QIBBuddy747509067 2024.12.05 0
85068 Can Nmn Rise Long Life? new RomaineMitchell9 2024.12.05 2
85067 404 Page new BroderickHowells795 2024.12.05 0
85066 Paper Bag Images new DonaldWilsmore0402 2024.12.05 0
85065 Minecraft Apk: The Ultimate Guide To Downloading, Installing, And Enjoying The Game new ElkeSpell30052295 2024.12.05 0
85064 Why Energy Efficiency Is A Big Deal new ChasForlonge7733 2024.12.05 5
85063 CollagenC Immune Booster Shot Alfa Vitamins Store new Latia0403980349582 2024.12.05 2
85062 Mitochondrial Disorder And Chronic Condition new DellGarrity9261949 2024.12.05 0
85061 Группы Телеграм По Городам России new TerryCubadgee48 2024.12.05 0
Up