Re: To John Drayton, re MC

On Thu, 09 Feb 2006 02:33:51 GMT, B Richardson <brich@xxxxxxxxxxxx> wrote:
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.


Spoke too soon, was thinking of concordia/discordia. Crystals
that incoporate the daughter product will initally inherit
the D/Di ratio of the source material, but you still start
out with zero slope.

.

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