different geomorphologic units. They are easy for
interpretation.
Five group of faulting or linear structures (NE, NNE,
NNW, NW and NWW) and seven ring structures were
distinguished on SIR-A image in Taihangshan
mountains. The structural interpretation map of SIR-A
image has been made for central Taihangshan
mountains (Fig. 3, Pic. 1).
What makes the ring features more obvious on SIR-A
image and results the Chuanli ring structure is easy to
be distinguished? Which kind of surface geological
structure is to be reflected by this ring image? We take
a studying as follows:
As you known, all ring images reflect some ring.( or
arc) mountains, rivers or lithologic belts which is
related to some geological structures. They are unclear
on common MSS, TM images if the mountains is of
low relief, rivers and rocks have little hue difference.
Because of different strike ôf these arc mountains or
rivers. On common remote image, whether or not
distinct of the culture depends on height angle and
orientation angle of the Sun as well as the relationship
with culture strike when imaging. Generally, when the
imaging is mane in the morning, NE and SN linear
images are more obvious, the mountain shadow in the
two directions also is obvious, but the mountain
shadow and linear images in EW and NW directions is
unclear, so the ring image is unclear and difficult to
distinguish. However, on the radar images in 50°
incidence angle and NE10° direction, linear images
and mountain shadow are all clear in all directions,
ring images is distinguished, which resulted in the
discovery of Chuanli ring structure.
3, The Ground Geological Characteristics of
Chuanli Ring Image
Chuanli ring image (No. C, ) is in the central of
attached radar image (Pic. 1, Fig. 3). It is nearly a
circle and reflects the ground ring mountains and
valleys. The ring image is 35km in diameter of ground.
In southwest, there is a group of arc images which is
projected towards the SW, scattered towards the NW
and converged towards the SE (this is a group of arc
faults, it was called brush-like structure). Chuanli ring
structure actually is the central of the “ brush-like
structure " , in this paper, we call the Chuanli ring
structure as Chuanli brush structure.
Based on the basic geology, the east of the Chuanli
ring structure is a series of arc mountains which is
constituted by eastern-declined dolomite, dolomitic
limestone of Gaoyuzhuang formation, Changcheng
series and dolomite, chert-bearing dolomite of
Wumishan formation, Jixian series; The southwest is
arc-like Shengxianshan which is constituted by
Jurassic volcanic rocks, they are thick texture, light
hue and clear shadow on SIR-A image, positive
geography; The south and north are anti-erosion
granulitite and amphibolite of Fuping group, they are
arc-like low mountains which projected towards south
and north. They show dark hue and thin texture on
SIR-A image and constitute a ring-like mountains.
More than ten of Yanshanian diorite, granodiorite and
granite porphyry intrusions, such as Dashiyu, Y infang,
Taiyu intrusions (Fig. 3), are distributed in Chuanli
ring structure. There is a 100MGa Bouguer anomaly, it
is concluded there may be a blind intrusion which
made up the center of the Chuanli brush structure. The
rotational activity causes the forming of ground brush
structure and Chuanli ring structure ( arc-like
extension of stratigraphy and mountains).
Chuanli brush structure is in the Taihangshan
structure — magma belt. It is favoräble for
mineralization. Many Cu, Pb, Zn deposits or
mineralization has been found in Yinfang, Sigezhuang
and Baiyunshan. Five Au, Ag deposits and more than
50 Au, Ag mineralization have been found in the
converge part of arc-like faults in southwest of Chuanli
brush structure. They are all in the center of Chuanli
brush structure or the converge part of brush structure
and intersections between NE, NWW faults and ring
structures. This area is a favorable place for Cu, Pb, Zn,
Au, Ag blind deposit prospecting.
Special thanks are paid to remote sensing centers of
Ministry of Geology and Mineral Resources, Ministry
of Nuclear Industry and Hebei Bureau of Geology and
Mineral Resources.
Reference
l. Xie Shousheng, Xu Yongjin, 1987, ( Micro-
wave remote sensing technology and its
application ), Public House of Electronic Industry,
pp. 133-157.
2. Editorial office of geological abstract for physical
prospecting and remote sensing, 1986,
Application of side-looking radar in geology, pp.
22-43 pp. 106-115.
3. Hebei Bureau of Geology and Mineral Resources,
1989, Geology of Hebei, Beijing and Tianjin,
Geological Publish House.
4. Suhe, Wang Wenliang, 1982, Handbook of Basic
Physics, People’ Public House of Inner
Mongolian, p. 541
5. Wang Xing, Remote sensing, 1977, Chinese
Book Company, pp. 182-189.
6. J. P.Ford, J. B. Cimino, C. Elachi: 1983, Space
Shuttle Columbia Views World With Imaging
Radar, the SIR-A Experiment NASA Jet
Propulsion Laboratory.
594 International Archives of Photogrammetry and Remote Sensing. Vol. XXXII, Part 7, Budapest, 1998
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