Re: To John Harshman -- re Isochrons


"Zoe" <muze10@xxxxxxx> skrev i en meddelelse
news:f4hk02l8nhmtu9dp4hpl0na1bc3ur3irfu@xxxxxxxxxx


Unless the D/Di ratio is homoginized in which case OldD / Di
doesn't affect the slope.

and that is the current question -- what is an adequate mechanism for
homogenization? Diffusion and slow convection are inadequate
mechanisms (in the world above ground) for homogenizing substances.
Why should it be different below ground, especially where there are
pressurized conditions and no room for the elements and isotopes to
move around.

1) about pressure. for gasses p*v = n*r*T, if you reduce volume the
temperature rise. Aren't temperature an expression of molecular movement? If
pressure has a volumen-decrease in fluids, I'm sure it would involve raised
thermal vibrations too, and wouldn't that be good for diffusion?
2) you and your 'nowhere to go'. I adressed that elsewhere. Water boiling in
a pot doesn't go anywhere either

If we for a minute assume that something eqvivalent to gasses happens to
liquids, then .. did you ever pump a deflated bicycle-tire - you would feel
the heat of compressing the air. Eqvivalently, when you decompress something
like letting go of the gass in a lighter - you'll instantly feel the cold.
What you watch at the surface of a volcanic event may be a less fluid
version (what temperature conserns) of what's happening below.
Most people has seen on tv magma pouring out on the ground or onto the
ocean-floor as the final step of it's journey, yet you insist that it's
contents are most likely not properly mixed. I suggest that you provide some
proper evidense for your claims, unless you achtually enjoy having us
hooting around like baboons on your ignorance.

an example of convection-currents
http://www.ingentaconnect.com/content/geol/jgs/1981/00000138/00000003/13830289

Quote a snib from above abstract
In the Nunarssuit Syenite igneous layering is normally graded (sharp mafic
bases becoming more feldspathic upwards) and channel structures, some with
basal breccias and extreme concentrations of mafic phases, are evidence of
magmatic currents. Contorted bedding provides evidence of c. 15 m of crystal
mush. In the chemically similar Klokken Laminated Syenite the layers are
inversely graded with well-sorted horizons of hedenbergite or fayalite at
the top of graded units. Current bedding and rare channels are superimposed
on this inverse grading, and striking load structures occur at junctions
with interbedded horizons of Granular Syenite, demonstrating the presence of
3 m of crystal mush.
Unquote

snip

Here is where the clever math comes in. Use ratios. Also, use a
premise of zero age at solidification.

I wish you could phrase that differently, it is self evident that
the rock is zero years old at solidification, it didn't exist
before that.

yes, the new rock is zero years old when it solidifies, but its
materials are not zero years old. You can't use the age of the
materials to mean the age of the rock since solidification. If you
fashion a piece of furniture out of wood, the newly formed furniture
will be zero years old,

but the age of the wood may be much older.

We'r eagerly awaiting for you to convert an isochron to a proper age from
one of your examples.

Carsten


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