>The dike is dated to 26.55 million years ago No wonder it was there when I was a child.
--- Frank C. Wimberly 140 Calle Ojo Feliz, Santa Fe, NM 87505 505 670-9918 Santa Fe, NM On Fri, Jun 21, 2024, 9:19 AM Stephen Guerin <stephen.gue...@simtable.com> 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.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. >>> >>> >>> -. --- - / ...- .- .-.. .. -.. / -- --- .-. ... . / -.-. --- -.. . >> FRIAM Applied Complexity Group listserv >> Fridays 9a-12p Friday St. Johns Cafe / Thursdays 9a-12p Zoom >> https://bit.ly/virtualfriam >> to (un)subscribe http://redfish.com/mailman/listinfo/friam_redfish.com >> FRIAM-COMIC http://friam-comic.blogspot.com/ >> archives: 5/2017 thru present >> https://redfish.com/pipermail/friam_redfish.com/ >> 1/2003 thru 6/2021 http://friam.383.s1.nabble.com/ >> > -. --- - / ...- .- .-.. .. -.. / -- --- .-. ... . / -.-. --- -.. . > FRIAM Applied Complexity Group listserv > Fridays 9a-12p Friday St. Johns Cafe / Thursdays 9a-12p Zoom > https://bit.ly/virtualfriam > to (un)subscribe http://redfish.com/mailman/listinfo/friam_redfish.com > FRIAM-COMIC http://friam-comic.blogspot.com/ > archives: 5/2017 thru present > https://redfish.com/pipermail/friam_redfish.com/ > 1/2003 thru 6/2021 http://friam.383.s1.nabble.com/ >
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