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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

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