Re: A testing time..

On Feb 3, 3:51 pm, don findlay <d...@xxxxxxxxxxxx> wrote:

<SNIP>

df:
(Read and Watson, 1975. Introduction to Geology, v.2.
Earth History, pps 195-196)
(You're a bit behind the times here, Bruce)

<SNIP>

bb:
In the late 1970s, I read only primary literature; but I would
definitely have examined this book, if I had seen it. To us
petrologists, Janet Watson (the wife of Arthur Holmes) was famous (or
notorious) for her 'basic front' of metasomatism, which Norman Bowen
called a 'basic affront' to plutonism, with a mumble. :-)

Now I understand. You must not be from the USA. Such a book would
likely never be used in an American university, and it's likely that
those who ask faculty to approve the purchase of library books would
not even have it in their libraries.

It is likely that I was one of few American petrologists who read the
works of each. Both Read and Watson were keen on the concept of the
dry diffusion of waves of Fe- and Mg-substances moving outward to make
room for granitic plutons - a concept that flew in the face of
physical chemistry, which Read found inapplicable to petrology.

In those days I was open to any ideas, which I compared with my
experience, both field and theoretical. (This group has tempered
that.) Here's a sentence those here would like:

'Related to these factors is the common coincidence of schistosity and
bedding. It may be suggested that tangential drag due to convection
currents is of more significance in metamorphism than orogenic
compression.' - A Commentary on Place & Plutonism

http://jgslegacy.lyellcollection.org/cgi/content/abstract/104/1-4/155

<SNIP>

df:
But Bruce, ..come on, ..  the crustal margin is not a kerb.  What
comes to mind though re the cross-ones is the way the spreading ridges
break under tension (collapse) when they get too long with respect to
the increasing curvature of the Earth.  (Is the kerb growing?)

Perhaps. In mid-summer the temperature here can reach 115 degrees
Fahrenheit (46 degrees Celsius), below freezing in the winter. So,
whether the cracks occurred from compression or expansion depends upon
when they formed.

However, I'm suggesting there exists a feature to look for on Google's
Earth, whose presence or absence may have some meaning. What meaning,
is not clear. (I suppose this is akin to H.H. Read's sensible view of
Bowen, whose mind found it reasonable to 'study mountains in tiny
crucibles'. You can see why his writings weren't on selected reading
lists in America. :-)


Bruce
.

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