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| Cut a sapphire bearing basalt at Khao Lun Thom (Bo Phloi, Kanchanaburi), Thickness is around 1 mm. Click on video. |
Grind on a #180 and #320 diamond plates placed on a kitchen knife sharpener.Click on video. This video shows #320 grinding. |
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| Hand grinding #800 carborundum+ water on a thick glass plate. It is most important process of my thin-section making. |
The section color is thinning.
When the thickness about the section reaches 0.03mm, A short grinding
using #1500 alumdum is the final stage. |
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| Check the interference color of plagioclases reaches grey or white. It is the sign of good thickness. After #1500, a cover glass is fix by UV curable adhesive. | Labeled thin section of LKT basalt. |
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| The same sample above making under XPL. There is an amygdal or xenolith is seen. This seems to be a gabbro composition. | The same sample above making under PPL. Some matrix are altered brownish minerals. |
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| Another amygdal or xenolith. The long and thin plagioclases look somewhat serpentine. Strong interference color minerals are clino-pyroxenes. | It is difficult for me to distinguish this is an amygdal or tiny xenolith. |
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| Another matix part of the second sample. The left center phenocryst is an olivine. |
Phenocryst olivines are not altered by Iddingsite.
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| Click the movie start. |
Click the movie start. |
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| I forgot to put a scale. This scale
is in 0.5mm increments. A poikilitic texture of pyroxenes is clear in
the central xenocryst. |
An opaque crystal in the center upward. |
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My thin-section microscope: LAOWA 25mm High-Resolution Close up Lens with Canon EOS M.
The polarized unit is also my hand-made. |
LAOWA 25mm High-Resolution Close up Lens: this is the best lens for thin-section photography in my experience.
http://www.yossi-okamoto.net/conference/EER2021_Poster.pdf |