Geology Reference
In-Depth Information
Table 19.2
Ln r
ij,
with standard deviations (in brackets)
(a) CA
Au
CrNiPgeTi
CuZnPbBa
SnSb
UThREE
Total
Archean
1.22
1.27
0.29
0.84
0.20
0.97
(0.077)
(0.171)
(0.192)
(0.189)
(0.378)
(0.062)
MPP
0.78
0.26
0.42
0.77
0.09
0.26
(0.102)
(0.180)
(0.134)
(0.095)
(0.174)
(0.055)
Np
0.23
0.46
0.86
0.61
0.35
(0.076)
(0.154)
(0.087)
(0.151)
(0.050)
NprA
0.34
0.54
0.48
0.66
0.43
0.43
(0.140)
(0.354)
(0.236)
(0.333)
(0.354)
(0.103)
NprP
0.10
0.95
0.69
0.97
0.36
0.37
(0.072)
(0.250)
(0.151)
(0.224)
(0.196)
(0.058)
(b) CAS
Au
CrNiPgeTi
CuZnPbBa
SnSb
UThREE
Total
Archean
0.83
1.54
0.80
0.17
0.21
(0.123)
(1.000)
(0.447)
(0.447)
(0.114)
MPP
0.40
0.31
0.04
0.50
0.11
0.03
(0.103)
(0.180)
(0.134)
(0.097)
(0.209)
(0.057)
0.12
0.60
Np
1.17
0.03
(0.316)
(1.000)
(0.267)
(0.200)
NprA
0.03
0.06
0.12
0.99
0.04
0.18
(0.140)
(0.354)
(0.236)
(0.333)
(0.354)
(0.103)
NprP
0.35
1.46
0.39
1.13
-0.67
0.10
(0.162)
(1.000)
(0.378)
(0.500)
(0.707)
(0.139)
(c) CS
Au
CrNiPgeTi
CuZnPbBa
SnSb
UThREE
Total
Archean
0.05
0.14
0.02
0.29
0.23
0.06
(0.100)
(0.333)
(0.152)
(0.577)
(0.267)
(0.077)
MPP
0.25
1.19
2.15
1.58
0.48
(0.354)
(0.707)
(0.707)
(0.447)
(0.243)
Np
0.01
0.40
0.39
0.23
0.48
(0.258)
(1.000)
(0.333)
(0.707)
(0.192)
NprA
0.58
0.70
0.70
0.18
0.33
(0.333)
(1.000)
(1.000)
-
(1.000)
(0.289)
NprP
19.5.2 Projected Mineral Endowment Beneath
the Congo Basin
geology of the Lufilian Arc, which are included in the former
but not in the latter. Other observations from our data reveal
the following:
• Archean domains: potential for gold (positive association
of 0.83); for all other minerals groups the fingerprints are
random; and for SnSb there is no data.
• MPP domains only display random mineral patterns, but
with a slight positive association for SnSb (0.50).
• Neoproterozoic domains display random distribution for
all mineral group (no association), except for CuZnPbBa
(strong positive signal of 1.17); again for SnSb there is no
data.
• For the NprA and NprP, we observe a random distribution
for all mineral groups.
Central Africa contains the Central Africa Shield, which in
turn contains the Congo Shield (CS) that hosts the Congo
Basin (CB). Thus,
CA
CB
, as illustrated in
the top right insert of Fig.
19.7
. As CB and CS are both
contained within the outer regions (CA and CAS) we assume
that across the CB and CS, relative to the distribution of their
conterminous geological domains in CA and CAS, mineral
fingerprints (patterns) will simulate those of the outer
regions. Figure
19.7
shows the distribution of the Pre-
cambrian areas within CA and CAS. Note that the CS
contains no NprP; and that CB contains most Archean
(85 %) and Neoproterozoic (14 %) domains (Fig.
19.8
).
CAS
CS
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