This scarf is a gift for my uncle, inspired by quartz clusters we saw together backpacking in Cottonwood Canyon in Death Valley. From what I've been reading I think they were formed by intrusive igneous rock forming around xenoliths, and by cooling very slowly forming the incredible quartz crystals we saw, which looked like rings around the darker xenoliths in the weathered rock face we saw. I'm not trained as a geologist though and would love to find more information about the geology of Cottonwood Canyon from someone with some real expertise!

The wool is targhee roving I got at the nor cal ren faire. I spun it on my small cross arm spindle and wove it on a loom I've been borrowing from a friend. It's plain weave set at 8epi. It looked very open on the loom, but fulled into a wonderfully bouncy and dense fabric.

After fulling I scoured the fabric, then used rubber bands to do this shibori inspired dye process. After putting on the rubber bands I gave it a bath in tannins I extracted from an oak gall, then in a bath of cool water with just a tiny bit of dissolved ferrous sulfate. It was so exciting to see the fabric turn grey in a a matter of just a few minutes when I put it in the iron bath!

#handweaving
#weaving
#handspinning
#naturaldyes
#dyes
#textiles
#handwoven
#handspun
#tiedye
#shibori
#oakgalls
#ferroussulfate
#naturaldye
#targhee
#wool
#geology
#xenolith
#quartz
#deathvalley

A cross-polars image of a garnet lherzolite xenolith from the Cretaceous Nikos kimberlite on Somerset Island, arctic Canada. 2mm scale bar in the lower right corner.

#ThinSectionThursday #Kimberlite #Xenolith #Mantle

@oldclumsy_nowmad @mineralsocamerica.bsky.social @FaithfullJohn

This EBSD scan was part of an M.Sc. thesis by Arvid Gonzalez -we're working getting it published, but in the meantime, his unpublished thesis can be downloaded from:

https://escholarship.mcgill.ca/concern/theses/cf95jh65k?locale=en

#Mantle #Xenolith #Cordillera #Petrology

A mantle xenolith (dunite) infiltrated by mafic melt on the left side. The melt has crystallized clinopyroxene, as shown by this electron backscattered diffraction image. Each pixel's data is a diffraction pattern that can determine mineral type and crystallographic orientation.

#ThinSectionThursday #Mineralogy #EBSD #Xenolith #Mantle

Wednesday, early afternoon posters at #AGU23
MR31B-0084 Effects of melt-rock interactions on deformation fabrics and rock physical properties in the shallow mantle lithosphere
James Kirkpatrick presenting, but this is the the M.Sc. work of Arvid Gonzalez (now core-logging in n. QC). Other authors are myself and Caroline Seyler (U. Minnesota).

Arvid found that infiltrating mafic melt reduces the preserved strain in mantle olivine.
#McGillUniversity #Mantle #EBSD #Xenolith #Lithosphere #Olivine