Research last night on historical geologic maps got the name of that
as the
"Galisteo Dike". composition and description in attachment. There is
one
further with as well. Also known as the Creston or Comanche Gap
https://galisteo.nmarchaeology.org/sites/creston.html
Basic formation given this description (chatGPT):
The Galisteo Dike is a geological formation characterized by its
composition and physical properties, indicating its formation through
volcanic activity. Here’s a detailed interpretation of its formation
based
on the description provided:
1. **Composition Analysis**: The Galisteo Dike consists of
micro-monzonite,
a fine-grained igneous rock. It contains a mixture of minerals
including
plagioclase, potassium feldspar, titan-augite, titaniferous biotite,
apatite, and opaque grains in a glass groundmass. This mineral
composition
suggests that the dike formed from magma that cooled relatively
quickly,
preventing the formation of large crystals.
2. **Physical Description**: The dike appears as a dark gray,
fine-grained
rock with a salt and pepper texture. It weathers to dark brown or
grayish
brown and forms a wall-like rampart. This implies that the dike is
resistant to weathering and erosion, standing out in the landscape as
a
prominent feature.
3. **Structural Features**: The dike is described as comprising many
right
echelon overlapping segments varying in length from 200 to 1200 feet
and up
to 18 feet thick. This pattern of overlapping segments indicates that
the
magma was injected into pre-existing fractures in the surrounding
rock,
likely under significant pressure, causing the fractures to open and
propagate in an en echelon pattern.
4. **Geological Age**: The dike is dated to 26.55 million years ago,
placing its formation in the Oligocene epoch. This was a time of
significant tectonic activity in many parts of the world, often
associated
with volcanic and plutonic intrusions.
### Formation Process
1. **Magma Intrusion**: The formation of the Galisteo Dike began with
the
intrusion of magma into fractures in the Earth's crust. The magma,
originating from deeper within the mantle, was rich in the minerals
described and had a high temperature, allowing it to flow and
penetrate the
fractures.
2. **Cooling and Crystallization**: As the magma moved upward through
the
fractures, it began to cool and solidify. The rapid cooling near the
surface resulted in the fine-grained texture of the rock, with
minerals
crystallizing quickly in the groundmass of glass.
3. **Fracture Propagation**: The injection of magma caused the
fractures to
propagate, leading to the characteristic right echelon overlapping
segments. This suggests that the fractures did not open uniformly but
rather stepped along the strike, with each segment forming as a
discrete
intrusion event.
4. **Weathering and Erosion**: Over millions of years, the surrounding
rock
may have eroded away, leaving the more resistant dike exposed as a
wall-like structure. The weathering of the dike itself results in the
observed dark brown or grayish brown coloration.
In summary, the Galisteo Dike was formed by the intrusion of magma
into
fractures in the crust, followed by rapid cooling and crystallization,
resulting in a fine-grained igneous rock with distinct mineral
composition
and structural features indicative of significant volcanic activity
during
the Oligocene epoch.
____________________________________________
CEO Founder, Simtable.com
stephen.gue...@simtable.com
Harvard Visualization Research and Teaching Lab
stephengue...@fas.harvard.edu
mobile: (505)577-5828
On Fri, Jun 21, 2024, 9:08 AM Nicholas Thompson
<thompnicks...@gmail.com>
wrote:
Dear Stephen,
Thank you for prompting me to respond to this inquiry. I was having
some
trouble getting the image to behave on my computer, and so was
reluctant to
wade in.
Indeed, just as nature abhors vacuums, she abhors straight lines,
and so
any line as straight as this one requires a special explanation. To
me,
that the line points southwestward toward the radar site NW of ABQ
suggests
a radar artifact, perhaps the shadow or some distant hill. As we
watched
the animated radar image, we could see a persistent weakness in the
radar
echo along that line, even as the clouds crossed it.
Speaking of abhorrent straight lines, during our conversation with
Frank,
we spent quite a lot of time discussing another line, a berm of sand
that
runs across the Galisteo Basin in roughly the same orientation,
perhaps 50'
high?. I had noticed this feature on topo maps and always assumed it
was
an old railway embankment. Frank, who knows the area well, thought
that
idea was absurd. So, we were left with the puzzle of a highly linear
geological formation several miles long.
Could it be that this geological straight line accounts for the
straight
line cloud formation that Mr. Kadlubek sees? As the dry line breaks
down
in anticipation of the SW Monsoon, moist air does indeed move
northward,
following the river valleys up from TX. AT some point, it will be
raised
enough that its moisture is condensed leading to the release of
latent heat
and the further development of clouds. If the structure that raises
it is
a straight line, then the clouds themselves will be arranged in a
straight
line. We can see this effect often along linear coast lines as a sea
breeze front topped by (usually) fair weather cumulus. However,
given all
the dramatic topography in the area, it's hard for me to imagine that
this
low lying feature would be determining very often.
I, too, live for the weather. I don't live for Face Book, however.
So if
you have any way to put in touch with Mr. Kadlubek, he and I could
perhaps
have coffee when I get back to Santa Fe in the fall.
Yours faithfully,
Nick Thompson
"Behavioral Meteorologist"
On Wed, Jun 19, 2024 at 7:06 PM Stephen Guerin <
stephen.gue...@simtable.com> wrote:
Nick,
It's your time to shine! Respond to Vince.
In the comments, local knowledge refers to it as the "prison line"
as
weather is different on either side of the prison on 14.
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