Brecciated Serpentinite – Location 24


 
Sample : Photo location 24
  Rock name : Brecciated Serpentinite (Turner, 1982)

 

Megascopic description:

Serpentinized ultramafic rock, with relicts of olivine, pyroxene cut by quartz veins.

Microscopic description:

The thin section of serpentinite shows the intensively fracturing to form the brecciated texture that their fractures are filled by carbonate and silica (chalcedony). The present of spinel and relic forms of pyroxene and/or olivine, anhedral to subhedral in shape, up to 4.0 mm in crystals size, indicated that their protolith is a ultramafic rocks, it has been metamorphosed (serpentinized) until to form the talk mineral (medium graded metamorphism). Some of talk minerals show the foliation structure in the some area of thin section.

MACRO PHOTOGRAPH

MICRO PHOTOGRAPH

Sample: Photo location 24

PPL

XPL

The thin section of serpentinite shows the intensively fracturing to form the brecciated texture that their fractures are filled by carbonate and silica (chalcedony). The talk mineral presents to form the foliation structure in the some area of thin section.

MICRO PHOTOGRAPH

Sample: Photo location 24

PPL

XPL

The thin section of serpentinite still shows the relic mineral/forms of pyroxene, spinel, and/or olivine, anhedral to subhedral in shape, medium to coarse in crystals size and they are cut by the veins of carbonate and silica (chalcedony). The talk mineral presents to form the foliation structure in the some area of thin section.

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