Geoscience Reference
In-Depth Information
W
E
DH
DH
DH
DH
(syn seis)
a)
90
100
110
120
130
140
150
160
S
hot point
0.05
100
0.10
200
I6
I6
S5
0.15
S5
300
0.20
Two-way
time (s)
Approximate
depth (m)
0
100
Metres
b)
Two-way time
0.01
s
I6
Rider
I6
S5
S5
c)
Depth
DH
DH
DH
DH
10 m
I6
Rider
I6
S5
S5
Coal
Shale
Sandy shale
Limestone
Sandstone
Figure 6.46
Seismic re
ections from the I6
and S5 coal seams are labeled. The grey shading shows the approximate extent of the synthetic seismic data in (b). (b) Synthetic seismic data
computed from the geological model in (c). (c) Geological model of the succession adjacent to the I6, Rider and S5 coal seams based on
interpolations between drillhole (DH) intersections. Based on diagrams in Gochioco (
1991
).
ection data from the southern Illinois coal basin. (a) Normal-incidence seismic re
ection section. Re
the
is quite a large feature, its seismic response is
subtle, primarily because of interference affects. The
hazard itself is detected, rather than resolved.
'
roll
'
surveys are described by Calvert and Li (
1999
), Calvert
The Bell Allard deposit (
Fig. 6.47
) is the largest in the
Matagami mining camp, which comprises a series of VMS
deposits occurring across the Galinée anticline within the
Archaean Abitibi greenstone belt. On the southern limb of
the anticline, where the Bell Allard deposit occurs, the
succession dips at about 45° towards the southwest. The
local succession comprises the Bell River Complex which
consists of layered mafic and ultramafic rocks, overlain by
felsic and mafic volcanic units. The lower of the units, the
6.7.4.2
Imaging structure and massive sulphide
mineralisation in a Greenstone Belt
A seismic re
ection survey in the vicinity of the Bell Allard
Cu
Au deposit in Québec, Canada, illustrates the
seismic re
ection method
-
Zn
-
Ag
-
'
s application to volcanogenic
massive sulphide (VMS) deposits and the complex hard-
rock volcanic formations that host these deposits. The
Search WWH ::
Custom Search