(4) the main group pattern of folds is parallel type . In the plane, the main group patterns
of faults are parallel, λ and en echelon type. In the profile, the main group patterns of faults
are stepped, graben and horst type, imbricate type only developes in the shallow margin in
southeastern mining area.
(5) Geological structures of the mining area are formed in three phases: Buckle folds and
reverse faults in east-west and failure planes in north-east and north-west formed during
Indosinian period. Buckle folds and reverse faults in north-east and failure planes in east-west
and south-north formed during Yanshan period. A great number of normal faults formed
during Himalayan period. The three phase structures are mutually restricted, superimposed
and transformed, which makes the geological structure of the mining area complex.
(6) The structural characteristics in Hancheng mining area: The structural strength is
strong in eastern and southern area and weak in western and northern area, the layer-sliping
develops in northern area and the fault develops in southern area. According to those
characteristics, the mining area was divided into three primary structural units in the east-west
direction, four second-oder structural units and four third-oder structural units in the
south-north direction.
Key words: geological structure; development pattern; group pattern; structural unit;
Hancheng mining area
Thesis: Basic Research
目录
目 录
1 绪论 ........................................................................................................................................ 1
选题背景及研究意义 ................................................................................................. 1
选题背景 .........................................................................................................
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