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Rocks and Microscopy > Altered andsite thin section, Reko Diq, Pakistan by Ian Butler

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Taken by
Ian Butler Ian Butler
Explore score
1
Size
0.42 Gigapixels
Views
483
Date added
Feb 15, 2012
Date taken
Feb 15, 2012
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Description

154 images taken with a a modified Meiji microscope in cross polarised light using a Nikon D60 and direct objective projection using a Zeiss objective. Bright spots at frame centres were minimised by altering the substage condenser position, but they were still a problem. As it turns out, using a different adapter with a lens on the D60 solves the bright spots but really messes up the flat field of the Zeiss objective.

Reko Diq is a porphyry Cu-Au deposit in the Balochistan region of Pakistan. The sample is a thin section of andesite which has seen a little alteration, probably from meteoric water circulation associated with the mineralisation. Plagioclase in the groundmass is the most altered, but within the section jewel-like amphibole phenocrysts have mostly survived and show complex twinnng and zoning under crossed polars.


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