[FRIAM] "Weather line" on 14

Sat Jun 22 22:44:22 EDT 2024

Barry, I apologize if I interrupted you.

---
Frank C. Wimberly
140 Calle Ojo Feliz,
Santa Fe, NM 87505

505 670-9918
Santa Fe, NM

On Sat, Jun 22, 2024, 3:38 PM Barry MacKichan <barry.mackichan at mackichan.com>
wrote:

> Several times on the Thuram Zoom call, I asked “Do you mean that volcanic
> dike?” but I always seemed to say it just as someone else started up.
>
> I have two memories about it.
>
>    1.
>
>    The president of SAR conjured up the image of 3,000 Comanches coming
>    through the gap (Comanche Gap) as they came to Santa Fe in the 1770s to
>    agree to the truce with New Mexico — the truce that I believe enabled the
>    Spanish to hang on for the next 50 years in NM. The image has stuck with me.
>    2.
>
>    I thought it would be a great place to find petroglyphs, and indeed it
>    is. The density of the “No trespassing” signs along the road increases as
>    the square of the inverse of the distance from the point where the road
>    crosses the dike. They make it clear exactly where you should not trespass.
>
> —Barry
>
> On 21 Jun 2024, at 11:18, Stephen Guerin wrote:
>
> 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.guerin at simtable.com
>
> Harvard Visualization Research and Teaching Lab
> stephenguerin at fas.harvard.edu
>
> mobile: (505)577-5828
>
> On Fri, Jun 21, 2024, 9:08 AM Nicholas Thompson <thompnickson2 at 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.guerin at 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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