| Summary: | 碩士 === 國立中央大學 === 應用地質研究所 === 84 === In this study, we performed image interpretation, geomorphic
analysis and fracture survey in the volcanic rocks that cover
the Chinshan fault, so as to interpret the sense of movement of
the underlying fault. In the same time, a physical model study,
which simulates the field condition of brittle rock underlying
by a fault, was made so that the interpretation can be assisted
by modeling results. The result from the image
interpretation and geomorphic analysis show that the Tatun
volcanic areas on two sides of the Chinshan fault are very
difference in geomorphic feature. This difference may be
affected by recent movement of the Chinshan fault. Field
data show that outcrop of the Chinshan fault and a clear
lineament are out of location. Fault outcrops locate on
northeast of the lineament. It is clear that the lineament can
not exactly be the fault line of the Chinshan fault. So, we call
it "Huang-Chi Lineament" in this study. The lineament may be!a
recent normal fault which form after structure inversion of the
Chinshan fault.The result from the fracture survey shows that
two sides of the Chinshan fault are also exhibiting different
fracture pattern. In southeast side of the Huang-Chi Lineament,
there are enechelon faults oblique to strike of the Chinshan
fault, and there also exist two joint sets, one set is parallel
to the Chinshan fault and the other set is parallel to the
enechelon fault. The result from the physical model (sandbox
model) shows that the fracture system of the Tatun volcanic area
may be interpreted by the left-handed normal-slip of the
underlying fault. The physical model also shows that "Chilian
Lineament" may be an antithectic fault associate with normal
faulting.
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