Geofluids

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 zonesSampleMineralClay minerals (%)O and H isotopic compositions ()
SCI/SItKaoδδ18δ18
Strong oxidation zoneK1Extracted kaolinite///1387−82.18.6−8.4
K2Extracted kaolinite2//1484−83.48.1−8.9
K3Extracted kaolinite///1189−80.49.7−7.3
K4Extracted kaolinite///1882−64.412.2−4.8
K5Extracted kaolinite3//1285−92.87.9−9.1
K6Extracted kaolinite///1090−81.19.3−7.7
Weak oxidation zoneK7Extracted kaolinite///1387−58.811.8−5.2
K8Extracted kaolinite///1783−49.212.2−4.8
K9Extracted kaolinite///1090−71.910.4−6.6
K10Extracted kaolinite///1783−59.312.8−4.2
K11Extracted kaolinite//7984−72.013.7−3.3
K12Extracted kaolinite///1783−53.213.3−3.7
K13Extracted kaolinite///1486−61.112.4−4.6
Mineralized zoneK14Extracted kaolinite///1189−70.112.6−5.2
K15Extracted kaolinite10//882−48.412.7−5.1
K16Extracted kaolinite10//783−56.412.9−4.9
K17Extracted kaolinite5//986−58.214.2−2.6
/, below detecting limit; Kao, kaolinite; It, illite; I/S, illite/smectite mixed-layer. C, chlorite; S, smectite.