ROCK DISCONTINUITY PATTERNS DEVELOPMENT ALONG CRUSHED ZONES SEPARATED BY FAULT MOVEMENT
ABSTRACT: Multivariate analysis
was applied to
rock-discontinuities taken from
areas, in which
folded and faulted sedimentary
rocks occur. The
purpose of the
analysis is to
verify the responses
of these discontinuities to
faults, from which
the really existing
fault can be
delineated and mechanism
and intensity of the
deformation on Tertiary
sediments underlying Quaternary
sediments can be
revealed that explain the
intensity of neotectonism as
the deformation continued
on the Quaternary
deposits. The sample parameters
consist of strike
and dip of
both bedding planes
and left also
right diagonal joint sets
respectively. From every
site of two
study areas two
sample groups were
taken from two rock-blocks separated
by a fault.
The analyses on
the six parameters
of the samples
exhibit the contribution of each
parameter to the rejection of the hypotheses of no effect of fault can be
examined, which lead into
a conclusion about
how far does
the parameter indicate
the existing fault.
The conclusion in Study
Area 1 is
that both right
and left joint
sets are significantly
affected by reverse fault, suggesting
that these two
joint sets in
uplifted rock-block were
still affected by the folding process after reverse movement of the
fault. Then, in Study Area 2, means of
strike of bedding planes and right joint
set significantly differ
as a result
of left lateral-slip
fault certainly moving
along a fractured zone.
Key words: Discontinuity responses to
fault, mechanism of
deformation, intensity of
deformation, neotectonisma
Author: Hendarmawan, Hirnawan, F., and Muslim, D.
Journal Code: jpbiologigg110005
