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5 votes
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In radiometric isochron dating why is at t=0 D*/Dref=const but P/Dref not?

1) D* (radiogenic isotope) and Dref (stable reference isotope) are two isotopes of the same element. P is the radioactive parent of D*, and is a different element. Chemical fractionation between P and ...
Geochron's user avatar
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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
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4 votes

How good is K-Ar dating?

The reliability is dependent on the quality, (for instance is the mineral reworked or porous and thus prone to contamination), and size of the sample, (small samples result in poorer measurement). ...
John's user avatar
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3 votes
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Verification statistic for ice core temperature reconstructions

On the temperature calculation using the 18O isotopes: Calibration: The samples are always plotted against the VSMOW (Vienna Standard Mean Ocean Water) which is always 0 permil. Info: We calibrate ...
Weiss's user avatar
  • 2,043
2 votes
Accepted

How do they get "deep lunar mantle" samples?

There are three ways samples of the mantle could arrive on the surface of the Moon. Drilling deep holes into the mantle, take a sample and send to the surface. As ejecta from a large deep impact ...
Fred's user avatar
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1 vote

What is the best way to interpolate isotopic data and display them?

Ok I think there is no similar package. Therefore, the best approach is to do the interpolation with the package Pykrige and for displaying the data I would recommend the package Basemap (...
Weiss's user avatar
  • 2,043
1 vote

Ice cores: how is Oxygen-18 isotopic variation converted to temperature changes?

It depends on which latitude you are in. In polar regions, a relatively linear equation can be used. This is because the so-called Liatiude effect has an extreme influence on the 18O signature. $\...
Weiss's user avatar
  • 2,043
1 vote

Potassum-Argon Dating and Proportions of Daughter Products in Potassium 40 Decay Channel

Potassium 40 has a half life of 1,300,000,000 years, which means that within that time half of the 11 percent which you refer to will have decayed to form Argon 40. Potassium 40 has two modes of ...
Michael Walsby's user avatar

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