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
84434 13 Things About Live2bhealthy You May Not Have Known new SergioConway59324 2024.12.05 0
84433 Все Тайны Бонусов Казино Криптобосс Казино Которые Вы Обязаны Знать new Alina08N0322751 2024.12.05 2
84432 Seo For Website new DelilahMontemayor052 2024.12.05 0
84431 14 Common Misconceptions About Live2bhealthy new PQTAgustin78122 2024.12.05 0
84430 Крупные Призы В Виртуальных Казино new ErmaMilburn0931 2024.12.05 2
84429 KUBET: Website Slot Gacor Penuh Maxwin Menang Di 2024 new LaureneFmd50457575 2024.12.05 0
84428 KUBET: Situs Slot Gacor Penuh Kesempatan Menang Di 2024 new DewittMachado604797 2024.12.05 0
84427 Internet Enterprise - Individuals Equalizer new ArnoldStaley366 2024.12.05 0
84426 По Какой Причине Зеркала Вебсайта Казино R7 Необходимы Для Всех Пользователей? new Mallory54Y41635 2024.12.05 6
84425 Methamphetamine (Desoxyn) Opinions new QuintonBqp53029604 2024.12.05 1
84424 25 Surprising Facts About Live2bhealthy new WinifredVelez0557645 2024.12.05 0
84423 The Ugly Truth About Live2bhealthy new PDDMariano042124562 2024.12.05 0
84422 Почему Зеркала Официального Вебсайта Веб-казино Гизбо Незаменимы Для Всех Игроков? new BrockMarcum84530 2024.12.05 2
84421 Use Bhopal Call Girls To Make Somebody Fall In Love With You new LanBernacchi744867 2024.12.05 1
84420 Bitcoin Cheet Sheet new TristanNess2899659 2024.12.05 2
84419 Second Income For Women - Are A Freelancer From Home! new Kelli15Y45517135057 2024.12.05 0
84418 Объявления В Рязани new Odell23Y633963590 2024.12.05 0
84417 Getting Tired Of Live2bhealthy? 10 Sources Of Inspiration That'll Rekindle Your Love new OEUDelila4500735628 2024.12.05 0
84416 Доски Объявлений Городов России new TerryHayner41525495 2024.12.05 0
84415 Объявления Санкт-Петербурга new CandyLarge519186135 2024.12.05 0
Up