Geology Reference
In-Depth Information
MINERALOGY/
ROCK TYPE
opx (cpx, sp)
Orthopyroxenite
opx, cpx (sp)
Websterite
opx, cpx, gt (sp)
Garnet Websterite
cpx, gt (opx)
Garnet Clinopyroxenite
cpx, gt
Garnet Clinopyroxenite
opx
cpx, gt, graph, (opx)
Graphitic Garnet
Clinopyroxenite
cpx, gt
ol, opx, cpx, gt
Garnet Clinopyroxenite
enclosing Garnet Lherzolite
cpx (gt)
Thinned (Garnet)
Clinopyroxenite
cpx, opx
Websterite
cpx, cor
cpx, gt, cor
Corundum Clinopyroxenite
Corundum Garnet
Clinopyroxenite
Figure 8.7
Graphic log with linked photos highlighting modal layering and
textural variation from the Beni Bousera Peridotite Massif, North Morocco (cour-
tesy of Graham Pearson).
a log is given in Figure 8.7, with example field photos indicated on the log. A
combination of such graphic logs and detailed field sketches are often required,
as the range of layering and other features can be on a variety of scales (for
example, Figures 8.4 and 8.7).
In describing layered rocks, large-scale repetition of particular types of lay-
ering may be observed. Such repetition is usually conspicuous, involving the
systematic recurrence of distinctive layers or sequences of the same kind of
