Geoscience Reference
In-Depth Information
Table 4.5 Lu-Hf isotopic data for basalts from
Burkina Faso
176 Lu/ 177 Hf
176 Hf/ 177 Hf
Sample
B44
0.0325
0.282976
B47B
0.0331
0.282992
B46
0.0209
0.282461
BN75
0.0224
0.282515
BN11A
0.0352
0.283011
BN208A
0.0667
0.284325
BN209A
0.0848
0.285037
BN263A
0.0469
0.283458
BN280B
0.0652
0.284246
Table 4.6 K-Ca isotopic data for Pikes Peak sample
PP 76-2 (Marshall and DePaolo, 1982 )
40 K/ 42 Ca
40 Ca/ 42 Ca
Whole-rock
0.1224
151.109
Plagioclase
0.0123
151.040
K-feldspar
0.800
151.577
Biotite
1.294
151.941
Table 4.7 U-Th activity ratios of minerals in a basaltic
andesite from the Soufrière St. Vincent in the Antilles
(Heath et al. , 1998 )
238 U 232 Th 230 Th 232 Th
Whole-rock
1.253
1.496
Olivine
1.089
1.183
Clinopyroxene
1.145
1.259
Plagioclase
1.136
1.244
Groundmass
1.244
1.450
Magnetic
1.230
1.458
10. Determination of the growth rate of a ferromanganese nodule from the excess of 230 Th
in different layers below the nodule surface. Plot the excesses listed in Table 4.8 in a
semi-log diagram. Find the growth rate from the slope of the alignment.
11. Dating the oldest terrestrial zircons (Wilde et al. , 2001 ) . Table 4.9 lists the 206 Pb/ 238 U
and 207 Pb/ 235 U ratios of four zircons from the Jack Hills conglomerate (Australia).
 
 
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