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27 votes
Accepted

How old is the Earth?

Yes, the age of the Earth is about 4.5 billion years (4,500 million years). Your linked articles describes well how it was formed and how we know about it. The uncertainty is less than 1% and depends ...
user2821's user avatar
  • 5,946
10 votes
Accepted

Unwarranted claim of higher degree of accuracy in zircon geochronology

I can't be entirely sure but I'll make an informed guess: That value doesn't come for a single measurement. Therefore, if the error in the age of a single sample is $\pm125$ kyr, you just need to ...
Camilo Rada's user avatar
  • 17.7k
9 votes

How old is Steptoe Butte (WA, USA)?

Without directly knowing anything about WA geology myself, you're dealing with two ages here: the age the rock deposited as a sandstone (protolith age, 1.4-1.5 Ga), and the age of metamorphism (400 Ma)...
desander's user avatar
  • 415
8 votes

What is the origin of the ocean's salt?

I'd like to add a bit to the existing answer and maybe break it down to several simple things: Chloride likes water. The chloride ion, Cl- really likes being in water. It's one of the most ...
Gimelist's user avatar
  • 23.1k
5 votes

How important or necessary are assumptions when it comes to radiometric dating?

The assumptions are either observably valid, tested, or logical. When creationists say they are uncertain they are obscuring the fact that these assumptions are almost always routinely tested. ...
Geochron's user avatar
  • 851
3 votes

References for Newton's & Kepler's age of the Earth calculations

Your question may be better suited to either SE History or SE History of Science and Mathematics. The date of the so called creation of the Earth has nothing to do with Earth Science. For Kepler I ...
Fred's user avatar
  • 24.7k
3 votes

Unwarranted claim of higher degree of accuracy in zircon geochronology

The uncertainty on the decay constant / half life is systematic. This means that, if the "used" value would be off the "true" value by 0.05%, then it would affect all the ages in ...
Geochron's user avatar
  • 851
3 votes

Does water affect radiometric dating?

No, not really. In simple terms, to be soluble in water, Pb must be in contact with it. But most of Pb is stored within the Zircon lattice, where water cannot diffuse through. For example, many ...
Curious's user avatar
  • 31
3 votes
Accepted

Radiometric dating data sets

It sounds like there are two primary ones: No, these are not the two "primary ones". The method used depends on what you are dating, and what age you expect it to be. Radiocarbon dating is relevant ...
Gimelist's user avatar
  • 23.1k
3 votes
Accepted

Historically, how did the total amount of salt / NaCl on Earth develop?

Here is a graph describing modern estimates of ocean salinity throughout the Phanerozoic (past ~550 million years). The original PDF of this study can be found here: Hay, W.W., Migdisov, A., ...
Geochron's user avatar
  • 851
2 votes

Would you see a correlation between detrital zircon age and grain shape?

My thought is that you would not see any correlation because grain roundness has to do with how long it has been in the sedimentary system rather than its crystallisation age. That is, if one sampled ...
Ton's user avatar
  • 316
2 votes
Accepted

Is astrochronology a proper method?

Yes it is used and it works. I've heard varying viewpoints on it's accuracy and dependability though. I remember my earth science lecturers were in three camps with it: one felt that the dates weren'...
Ash's user avatar
  • 4,390
1 vote

References for Newton's & Kepler's age of the Earth calculations

Click link to see image: Kepler's 3992 B.C. Calculation, from his German work, see the cover of Chronologia. 5612 (year of creation) - 1620 (date of paper cover) = 3992 B.C. To obtain the source ...
Timothy Law's user avatar
1 vote

Radiometric dating data sets

There are huge datasets of geochronology available in the published literature. Unfortunately there is not one single database because the task is daunting (there are several thousand geochronology ...
Geochron's user avatar
  • 851

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