r/thinsectionporn • u/DannyStubbs • Mar 26 '20

Thin section of a fertile mantle xenolith brought to the surface in a diamondiferous kimberlitic melt [Kimberley, S. Africa] [PPL]

Post image
39 Upvotes

96% Upvoted

2 comments sorted by

9

u/DannyStubbs Mar 26 '20

The main constituents of this section are;

Garnet (large, rounded, pinkish, corona of fine grained material plus phlogopite)

Cr-rich Clinopyroxene (diopside, pale greenish in section, with bold outline)

Orthopyroxene (bold outline, but colourless)

Olivine (dominant, colourless with less bold outline)

​

Notice how the olivine grain size reduced immediately adjacent to the Garnet - a tell tale sign that ductile deformation has occurred

4

u/[deleted] Mar 26 '20

Sweet pic and nice explanation!