Geology Reference
In-Depth Information
ANSMET lunar meteorite stones
7
Apollo 16 soil
5
¥
Basaltic
4
T
E e
U
3
¢
2
B
Q
1. 5
q
P
L
M m
I
1
$
Range of Apollo and
Luna mare basalts
Feldspathic
£
A
0.7
G
0.6
45
7
10
15
20
30
40
50
70
100
Sc ( μ g/g)
Figure 6.3. ANSMET lunar meteorites in Sc-Sm space; note logarithmic axes. Each point represents the mean composition of a
named stone; see Table 6.1 for symbol key. Gray fields encompass paired stones. For reference, the mean composition of typical
mature regolith from Apollo 16 is represented by the filled circle [ Korotev , 1997]. Sc increases with increasing pyroxene abundance.
For the nonbasaltic meteorites, Sm increases with increasing abundance of KREEP components.
20
Dhofar 1442
Procellarum
KREEP
Terrane
ANSMET
NIPR
10
Africa
SaU 169
Australia
7
Oman
NWA 4472/4485
Apollo 16 soil
5
4
3
1
2
¥
¢
1
U
E
T
0.7
Intermediate
Basaltic
Q
M
0.5
0.4
p
Feldspathic
L
B
I
$
A
0.3
£
G
0.2
Range of Apollo and
Luna mare basalts
Feldspathic
Highlands
Terrane
0.1
0.07
All lunar meteorites
0.05
3
4
5
6
78910
15
20
25
FeO T (%)
Figure 6.4. Comparison of compositions of ANSMET lunar meteorites to lunar meteorites from other locations in FeO-Th space
(total Fe as FeO T ); note logarithmic axes. Each point represents the mean composition of a meteorite. For paired ANSMET mete-
orites, the symbol is that for the largest stone (see legend in Table 6.1). The two “Africa” points that overlap with the LAP 02205
point (symbol “1” representing the mean of all six LAP stones) are NWA 032 and NWA 4734. Meteorites with 7%-12% FeO are
absent in the ANSMET collection as are Th-rich meteorites. The horizontal dashed line represents the Procellarum KREEP
Terrane boundary of Figure 6.2.
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