Research Article
Origin and Role of Kaolinization in Roll-Front Uranium Deposits and Its Response to Ore-Forming Fluids in the Yili Basin, China
Table 5
O and H isotopic compositions of extracted kaolinite from altered zones in the Mengqiguer uranium deposit.
| Altered zones | Sample | Mineral | Clay minerals (%) | O and H isotopic compositions () | S | C | I/S | It | Kao | δ | δ18 | δ18 |
| Strong oxidation zone | K1 | Extracted kaolinite | / | / | / | 13 | 87 | −82.1 | 8.6 | −8.4 | K2 | Extracted kaolinite | 2 | / | / | 14 | 84 | −83.4 | 8.1 | −8.9 | K3 | Extracted kaolinite | / | / | / | 11 | 89 | −80.4 | 9.7 | −7.3 | K4 | Extracted kaolinite | / | / | / | 18 | 82 | −64.4 | 12.2 | −4.8 | K5 | Extracted kaolinite | 3 | / | / | 12 | 85 | −92.8 | 7.9 | −9.1 | K6 | Extracted kaolinite | / | / | / | 10 | 90 | −81.1 | 9.3 | −7.7 |
| Weak oxidation zone | K7 | Extracted kaolinite | / | / | / | 13 | 87 | −58.8 | 11.8 | −5.2 | K8 | Extracted kaolinite | / | / | / | 17 | 83 | −49.2 | 12.2 | −4.8 | K9 | Extracted kaolinite | / | / | / | 10 | 90 | −71.9 | 10.4 | −6.6 | K10 | Extracted kaolinite | / | / | / | 17 | 83 | −59.3 | 12.8 | −4.2 | K11 | Extracted kaolinite | / | / | 7 | 9 | 84 | −72.0 | 13.7 | −3.3 | K12 | Extracted kaolinite | / | / | / | 17 | 83 | −53.2 | 13.3 | −3.7 | K13 | Extracted kaolinite | / | / | / | 14 | 86 | −61.1 | 12.4 | −4.6 |
| Mineralized zone | K14 | Extracted kaolinite | / | / | / | 11 | 89 | −70.1 | 12.6 | −5.2 | K15 | Extracted kaolinite | 10 | / | / | 8 | 82 | −48.4 | 12.7 | −5.1 | K16 | Extracted kaolinite | 10 | / | / | 7 | 83 | −56.4 | 12.9 | −4.9 | K17 | Extracted kaolinite | 5 | / | / | 9 | 86 | −58.2 | 14.2 | −2.6 |
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/, below detecting limit; Kao, kaolinite; It, illite; I/S, illite/smectite mixed-layer. C, chlorite; S, smectite.
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