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File:Thin section scan crossed polarizers Siilinjärvi R625-122.05.jpg

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A sample from which the thin section was made.
English: Scanned image of thin section from Siilinjärvi apatite ore in cross polarised transmitted light.

The thin section has a clear orientation and the movement has concentrated to planes between the bigger grains. Clasts form half of the thin section, and the rest is composed of oriented groundmass.

Tetraferriphlogopites are present as bent flakes and elongated laths. The flakes have turned into the shear direction and broken into elongated grains towards the shear direction. Groundmass-sized fragments constitute about 60 % of the micas. The flakes are 0.5-2.5 mm in diameter and have often signs of deformation: they are bent and broken by the cleavage plains. The laths are shattered, and grain size varies with the shearing intensity from flake-sized grains to extremely tiny groundmass. Tetraferriphlogopite covers 70 % of the thin section.

Apatite is present as altered grains and as fragments broken from them. The grains are often in companion with carbonate minerals, and the carbonates form inclusion trails in apatite grains. Apatites occurs in all sizes: from tiny fragments < 0.1 mm wide to large porphyroclasts up to 5 mm in diameter. Apatite forms 20 area-% of the thin section.

Carbonates form 10 % of the thin section area, and the dominating carbonate mineral is dolomite. They are found in dispersed veins with apatite and as individual grains in the flow zones. Grains are commonly 0.1-0.5 mm wide. The grains around apatites are often only < 0.1 mm in diameter. Some small scale aggregates are found in veins with apatite.
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current19:05, 12 November 2019Thumbnail for version as of 19:05, 12 November 20193,700 × 2,180 (2.53 MB)Kallerna (talk | contribs)User created page with UploadWizard

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