Re: To John Drayton, re MC

On Thu, 09 Feb 2006 02:09:25 GMT, Zoe <muze10@xxxxxxx> wrote:
On 07 Feb 2006 10:35:04 GMT, poiuy@xxxxxxxxxxxx (Eric Rowley) wrote:

snip>

If the melt doesn't homogonize you don't get an isochron with a
steeper slope, you get random datapoints that don't form a
straight line (isochron).

but what if the melt has retained its original ratios, then when
crystals are re-formed, they could pull isotopes in the same original
ratios as those already present in the melt, with a little scatter to
be expected.


The daughter product isn't an element thats a suitable candidate
for inclusion into the crystal. Zircons in particular strongly
discriminate against lead when forming , but are happy
with uranium which has a lead isotope at the end of the
decay chain.

.

Relevant Pages

  • Re: To John Drayton, re MC
    ... but what if the melt has retained its original ratios, ... crystals are re-formed, they could pull isotopes in the same original ... ratios as those already present in the melt, ...
    (talk.origins)
  • Re: To John Drayton, re MC
    ... but what if the melt has retained its original ratios, ... ratios as those already present in the melt, ... because the isochron forms a nice straight line. ...
    (talk.origins)
  • Re: To John Drayton, re MC
    ... but what if the melt has retained its original ratios, ... ratios as those already present in the melt, ... because the isochron forms a nice straight line. ...
    (talk.origins)
  • Re: How do crystals form?
    ... The simplest explanation is that crystals have a ... lower energy than the solution or melt they came from. ...
    (sci.physics)