Geology Reference
In-Depth Information
11
Split and cracked blocks and slabs
Many granite blocks, boulders, slabs and plates have been split as a result of the development of
fractures. Some are isolated, others arranged in distinct, if in some instances irregular and var-
ied, patterns. Some are open, others tight. Some are joints, others faults. Some of the faults have
been active recently, and minor fault scarps, occurring either singly or in regular arrangements
to give minor horsts and grabens, are commonplace on granite outcrops (Fig. 11.1). In other
instances, however, the displacements are much greater.
11.1
SPLIT ROCKS
11.1.1 Description
Some boulders have been split in two parts ( Fig. 11.2) . In many instances the two parts are of equal
mass, or nearly so. The parting fractures are most commonly planar, but some are arcuate or wavy.
(a)
Figure 11.1.
(a) Minor fault scarps Minnipa Hill, northwestern Eyre Peninsula, South Australia, formed
19 January 1999.
 
 
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