Table 4. Estimated mineral molar abundances* in the parent (P) Daniel Springs meta-gabbro, C, B and A weathering horizons and changes in molar abundance across horizons (negative values indicate mmoles lost).
|
Mineral# |
A |
B |
C |
P |
A / B |
B / C |
C / P |
|
|
Plagioclase |
-- |
0.235 |
0.888 |
1.515 |
-0.24 |
-0.65 |
-0.63 |
|
|
Hornblende |
-- |
0.128 |
0.344 |
0.449 |
-0.13 |
-0.22 |
-0.10 |
|
|
Biotite |
-- |
-- |
0.029 |
0.088 |
0.00 |
-0.03 |
-0.06 |
|
|
Epidote |
- |
0.028 |
0.054 |
0.068 |
-0.03 |
-0.03 |
-0.01 |
|
|
Quartz |
5.267 |
3.448 |
1.587 |
0.999 |
1.82 |
1.86 |
0.59 |
|
|
Ilmenite |
-- |
0.027 |
0.029 |
0.241 |
-0.03 |
0.00 |
-0.21 |
|
|
Vermiculite |
-- |
0.022 |
0.190 |
-- |
-0.02 |
-0.17 |
0.19 |
|
|
Kaolin |
2.241 |
2.192 |
0.802 |
-- |
0.05 |
1.39 |
0.80 |
|
|
Anatase |
0.004 |
0.005 |
0.006 |
-- |
0.00 |
0.00 |
0.00 |
|
|
Goethite |
0.167 |
0.11 |
0.005 |
-- |
0.06 |
0.10 |
0.00 |
|
|
Hematite |
0.073 |
0.056 |
0.058 |
-- |
0.02 |
0.00 |
0.06 |
|
|
HIV |
0.167 |
- |
-- |
-- |
0.17 |
0.00 |
0.00 |
*Units are mmoles per gram of solid. dashes (--) indicate the mineral is absent. #See Table 2 for stoichiometeries.