Conta Historia
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Location - Brazil, Minas Gerais; -20.22417, -43.52222
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Age (of protore) - 2580-2400 Ma
Original size - 0.48 million tonnes of Mn
References
Cabral, A. R., Lehman, B., Sattler, C.D., Pires, F.R.M., and Kaneko, K., 2002,Hg–Tl-bearing manganese oxide from Conta História manganese deposit, Quadrilátero Ferrifero, Minas Gerais, Brazil: Trans. Instn Min. Metall.(Sect. B: Appl. earth sci.), 111, p. B123-B127.
Also Proc. Australas. Inst. Min. Metall., 307, May–August 2002.
major elements - trace elements - rare-earth elements - REE normalized - isotopes
Major Elements, oxide percent
|
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Sample location
|
Sample no. |
% |
% |
% |
% |
% |
% |
% |
% |
% |
% |
% |
MnO |
Fe2O3t |
SiO2 |
Al203 |
CaO |
MgO |
K2O |
Na2O |
TiO2 |
P205 |
LOI |
||
Average
|
Oxide ore |
62.7 | 21.0 | 0.59 | 1.91 | 0.09 | 0.08 | 0.74 | 0.15 | 0.05 | 0.16 | 11.7 |
9 | compact ore | 76.2 | 6.33 | 0.40 | 0.84 | 0.08 | 0.08 | 1.60 | 0.15 | 0.01 | 0.19 | 12.3 |
3 | banded ore | 68.1 | 13.8 | 0.81 | 1.67 | 0.16 | 0.11 | 1.00 | 0.60 | 0.04 | 0.16 | 11.9 |
5 | banded ore | 66.3 | 20.5 | 0.37 | 0.80 | 0.10 | <0.01 | 0.20 | 0.05 | 0.01 | 0.12 | 11.5 |
2 | banded ore | 66.1 | 13.6 | 0.95 | 2.56 | 0.11 | 0.38 | 1.35 | 0.14 | 0.18 | 0.13 | 14.2 |
8 | compact ore | 63.3 | 15.0 | 0.67 | 4.91 | 0.06 | 0.06 | 1.14 | 0.15 | 0.09 | 0.20 | 14.3 |
1 | concretionary | 62.2 | 21.9 | 0.53 | 1.66 | 0.15 | <0.01 | 0.19 | 0.07 | 0.02 | 0.19 | 12.3 |
7 | banded ore | 58.1 | 28.9 | 0.58 | 1.14 | 0.08 | <0.01 | 0.17 | 0.07 | 0.05 | 0.09 | 10.6 |
6 | banded ore | 57.0 | 27.6 | 0.44 | 2.94 | 0.05 | <0.01 | 0.35 | 0.08 | 0.02 | 0.08 | 11.4 |
4 | banded ore | 47.2 | 41.6 | 0.58 | 0.68 | 0.04 | 0.08 | 0.66 | 0.02 | 0.04 | 0.24 | 7.0 |
10 | friable itabirite | 0.39 | 89.9 | 0.65 | 0.60 | 0.02 | 0.03 | 0.01 | <0.01 | 0.03 | 0.53 | 7.7 |
11 | tuffacecous | 0.31 | 17.6 | 36.0 | 32.2 | 0.01 | <0.01 | 0.02 | <0.01 | 0.23 | 0.11 | 13.3 |
Trace elements, ppm
|
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---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
ppm |
ppm |
ppm |
ppm |
ppm |
ppm |
ppm |
ppm |
ppm |
ppm |
ppm |
ppm |
ppm |
ppm |
ppm |
ppm |
ppm |
ppm |
ppm |
|
As |
Ba |
Cd |
Co |
Cr |
Cu |
Mo |
Nb |
Ni |
Pb |
Rb |
Sc |
Sr |
Th |
U |
V |
Y |
Zn |
Zr |
Avg oxide | 7.0 | 3028 | 0.82 | 14.8 | 12.2 | 19.9 | 6.9 | 11.8 | 1067 | 0.5 | 1.1 | 3.2 | 10.9 | ||||||
9 | 9 | 12273 | 0.5 | 12.8 | <5 | 51.3 | 6.4 | 5.1 | 12.0 |
3.54 |
39 |
133 |
|||||||
3 | 7 | 389 | 2.4 | 15 | 7 | 17 | <1 | 49 | 186 |
2.2 |
14 |
41.7 |
|||||||
5 | 7 | 294 | <0.1 | 7.1 | 5 | 7.8 | 2.3 | 2.4 | 166 |
4.6 |
38 |
64.9 |
|||||||
2 | 7 | 2278 | 0.9 | 29 | 37 | 33.8 | 30.2 | 7.2 | 213 |
3.6 |
23 |
56.4 |
|||||||
8 | 13 | 2691 | 0.4 | 18.3 | 25 | 31.1 | 13.8 | 12.8 | 59 |
4.7 |
13 |
80.9 |
|||||||
1 | 9 | 5623 | 0.2 | 25.4 | 7 | 19.9 | 4.4 | 3.1 | 167 |
5.6 |
21 |
65.6 |
|||||||
7 | 4 | 1185 | 0.2 | 7.6 | 11 | 9 | 2.6 | 2.6 | 8.63 |
3.6 |
42 |
205 |
|||||||
6 | 3 | 1844 | 0.3 | 10.6 | 7 | 8.9 | 1.8 | 1.1 | 7.88 |
3.9 |
46 |
85.7 |
|||||||
4 | 4 | 676 | 2.4 | 7 | 8 | <1 | <1 | 23 | 7.61 |
2.9 |
28 |
249 |
|||||||
10 | na | 16 | na | 35 | 4 | 34 | <3 | 135 | 10.5 |
1.9 |
19 |
62.2 |
|||||||
11 | na | 24 | na | <3 | 41 | <10 | 11 | <4 | 10.2 |
4.4 |
45 |
63.5 |
blank or na or nr = not reported; bd = below detection
Rare-earth elements, ppm
|
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Sample | La |
Ce |
Pr |
Nd |
Sm |
Eu |
Gd |
Tb |
Dy |
Ho |
Er |
Tm |
Yb |
Lu |
Rare-earth elements, normalized to chondritic values of Taylor & McLennan (1992) |
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Sample |
LaN |
CeN |
PrN |
NdN |
SmN |
EuN |
GdN |
TbN |
YbN |
Ce/Ce* |
Eu/Eu* |
LaN/YbN |
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Isotopes |
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Sample |
%S ore | δ34S ore, sulfide | %S host | δ34S host, sulfide | δ13C pdb | δ18O pdb | δ18O smow | MnO % | Ccarb % | mineralogy |