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IOCG MINERAL DEPOSITS, 3<br />
Uncertain issues:<br />
-origin of Au + LREEs<br />
-causes of<br />
hydrothermal alteration<br />
silicate dissolution<br />
metal transportation<br />
Source of halogens for highly alkaline and/or F-rich<br />
solutions<br />
-evaporites formed in sabkha, playa or salt<br />
lake environments<br />
-basinal brines and/or mixing with sea water