Examples of gabbro

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In the foliated gabbro, andesine also predominates, but with minor oligoclase.
These coarse-grained patches are igneous in origin and grade into finer-grained gabbro at the edges.
The gabbro also contains apatite, pyrrhotite and zircon as accessory minerals.
The plagioclase in the undeformed gabbro is andesine.
Metabasaltic xenoliths (samples no. 74 and no. 79) are abundant within the gabbros and wehrlites exposed along the crest of this ridge.
The base of the gabbro stratigraphy is not exposed, and underlying units may contain olivine that is more forsteritic.
Generally, the granite seems to have remained above its solidus longer than the gabbro.
In such cases, scattered plagioclase crystals occur in the gabbro close to the enclaves.
Note the sharp but irregular contacts between the darker wehrlites and the lighter layered olivine oxide gabbros.
The granite occupies the northern parts, whereas in the south the massif is composed of gabbro in the west and leucogabbro in the east.
Indeed, the pronounced planar foliation exhibited in the case of the laminated gabbro appears to be the principal difference between the two.
Therefore, on the basis of olivine composition, the marginal gabbro is a possible parental magma.
The oikocrysts become larger (4-5 cm) in the central olivine gabbros compared to marginal gabbros (0.5-2 cm) and are commonly optically zoned.

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