 |
 |
|
|
Micrographs
 |
01
... Grey, mica-rich phyllite. White mica shows as dark brown stripes, quartz is light, garnet as a coarse, dark brown grain. Other brown grains are dark mica (biotite). Long margin correspond to c. 2 mm. Micrograph of thin section in polarized light. |
 |
02
... The same field of view with crossed polarizers. White mica is yellow,
dark mica is blue and red, quartz in grey shades and garnet black. Long margin correspond to c. 2 mm. Micrograph of thin section with crossed polarizers. |
 |
03
... Enlarged view of garnet with "S"-shaped inclusions. Garnet
was, apparently, rotated during his growth. This rotation may be related
to an early stage of nappe transport. Long margin correspond to c. 1 mm. Micrograph of thin section in polarized light. |
 |
04
... Folded Phyllit with several fold phases. An early foliation is folded
into a crenulation cleavage. This crenulation cleavage is refolded into
the folds visible on the micrograph. Long margin correspond to c. 2 mm. Micrograph of thin section in polarized light. |
 |
05
... Detail
of micrograph to the left with the early foliation (S1; vertical) folded
into a crenulation cleavage (S2; c. horizontal). In the top right corner
a further fold phase and a new crenulation cleavage (S3) can be observed. Long margin correspond to c. 0,5 mm. Micrograph of thin section with crossed polarizers. |
 |
Quartz phyllite. Sequence of micrographs with successively stronger enlargement and alternately one or two (crossed) polarizers. The minerals are mostly quartz (grey shades), muscovite (white mica, blue with crossed polarizers) and biotite (dark mica, brown-red). 06 ... Long margin correspond to c. 2 mm. Micrograph of thin section in polarized light. |
 |
07 ... Long margin correspond to c. 1 mm. Micrograph of thin section with crossed polarizers. |
 |
08 ... Long margin correspond to c. 2 mm. Micrograph of thin section in polarized light. |
 |
09 ... Long margin correspond to c. 0,25 mm. Micrograph of thin section with crossed polarizers. |
 |
10
... Volcanic rock, tuffite, strongly folded, mylonitic. Yellow-green minerals
are various mica minerals. Grey shades represent feldspar and quartz. Long margin correspond to c. 2 mm. Micrograph of thin section with crossed polarizers. |
 |
11
... Calcareous phyllite with mostly quartz (grey shades) and calcite (red-green). Long margin correspond to c. 2 mm. Micrograph of thin section with crossed polarizers. |
 |
12...
Phyllite with mica (blue, red, brown), quartz (grey shades) and calcite
(green-red), folded. Long margin correspond to c. 1 mm. Micrograph of thin section with crossed polarizers. |
 |
13
... Mica-rich phyllite, folded. Long margin correspond to c. 2 mm. Micrograph of thin section with crossed polarizers. |
 |
14
... Strongly altered Stekenjokk Quartz-keratophyre with coarse, deformed
quartz (grey, middle) in the course of recrystallizing to relatively small
quartz grains (black-white); subordinate mica grains (coloured). The alteration
took place after the formation of the rock at the sea floor and is a step
in the formation of the Stekenjokk ore body. Long margin correspond to c. 1 mm. Micrograph of thin section with crossed polarizers. |
 |
15...
A more strongly enlarged view of the same Quartz-keratophyre with calcite
(striped), mica (yellow-red) and quartz (grey shades). Long margin correspond to c. 0,5 mm. Micrograph of thin section with crossed polarizers. |
 |
16...
Somewhat altered Quartz-keratophyre with newly formed mica minerals (red-green
colours) and calcite (coloured, striped). Long margin correspond to c. 2 mm. Micrograph of thin section with crossed polarizers. |
 |
17
... Quartz-keratophyre with quartz (fine grained, grey shades) and feldspar
(coarse, striped, grey grains), with metamorphic minerals horneblende
(coloured) and garnet (black). Long margin correspond to c. 2 mm. Micrograph of thin section with crossed polarizers. |