Mylonitic Schist – Location 15


 
Sample : Photo location 15
  Rock name : Mylonitic Schist (Turner, 1982)

 

Megascopic description:

Strongly foliated rock, fine crystalline dark color (dark grey – greenish, or bluish?) cut by cream-brownish veinlets. Weatehered garnet (cream color) clusters are locally found, probably mylonitic rock.

Microscopic description:

The thin section of schist shows the heteroblastic textures, consist of quartz, chlorite, muscovite, epidote, and opaque, less than 0.3 mm in crystals size, anhedral – subhedral in shape. Opaque mineral sometimes present as porpyroblasts to form the porpyroblastic texture, subhedral in shape, and up to 1.5 mm in crystal size. The schistosity structure is formed by the orientation and segregation of quartz, chlorite, muscovite, opaque, and they strongly folded and/or faulted to mylonitic texture. The veins of calcite sometimes present to cut the rock.

MACRO PHOTOGRAPH

MICRO PHOTOGRAPH

Sample: Photo location 15

PPL

XPL

The thin section of schist shows the heteroblastic texture, consist of quartz, chlorite, muscovite, epidote and opaque, fine crystals size, anhedral – subhedral in shape. The rock strongly folded and/or faulted to form mylonitic texture.

MICRO PHOTOGRAPH

Sample: Photo location 15

PPL

XPL

The thin section of schist shows the heteroblastic texture, consist of quartz, chlorite, muscovite, epidote and opaque, fine crystals size, anhedral – subhedral in shape. The rock strongly folded and/or faulted to form the microfold or micro faults.

MICRO PHOTOGRAPH

Sample: Photo location 15

PPL

XPL

The thin section of schist shows the porphyroblastic texture that the opaque mineral present as porpyroblasts in groundmass of quartz, chlorite, muscovite, epidote and opaque. The groundmass strongly folded and/or faulted to form the microfold or micro faults.

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