These are thin-section photomicrograp of Continental Carbonate rocks ( XPL and PPL). Can somebody help me in the identification of minerals marked by red arrows ?
Thank you very much in advance.
Dear Mr. Idriss,
I suspect this of being issue related to the preparartion of your thin sections. Give a more detailed description of the lithofacies where you have taken the samples from . It is certainly not the image of "normal calcareous lithofacies" . Could it be an impurity introduced during the mounting or embedding of the rock samples ?
H.G.Dill
Dear Mr Saber,
I agree with prof. Dill. These grains looks impurities released during the polishing of your thin sections. In your image 3-PPL, fibres from tissues used during the cleaning of your thins section are still attached to the surface. when you clean it it will disappear.
Image 3 clearly contains tissue fibres. Are the thin sections abraded with carborundum? - for the high-relief grains look like it.
I guess this is a carbonaceous sandstone facies. The first figure show carbonate (calcite) arrows at the top. Yellow and blow mineral is probably pyroxene. The dark grey materials are probably SiC polishing grains. 3rd figure show probably zircon. Sections need washing and cleaning with ethanol.
I think this is carbonaceous pyroclastic sandstone. It seems as a pyroxine /amphibole minerals group
I suspect these are polishing micro-particles got caught in micro-cavities in your samples.
After polishing, rise off with running tap water and put it in a micro-sonic vibrator to shake of all loose particles.
Rinse off with alcohol -ethanol & make dry using soft paper tissue before observation under microscope.
Good luck
It is clearly traces of carborundum powder caught during preparation of thin section as given by their high relief and birefringence
I think some piece of cacite rock fragment but thick and may be some bone fragment and fibrous tissue
I aggree with mr D, Ahmed, that is pyroclastic Carbonaceus. can you show rock samples before cutting? because it will help a lot to ensure the type of rock
- Badges
- Science topic