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Mudstones containing smectite have been altered under mildly alkaline conditions (9<pH<10) at Searles Lake, California over a 3 million-year time period. Published mineralogical investigations have shown that up to 70% of detrital clay may be replaced by authigenic minerals such as Fe-illite, analcime, and K-feldspar over timescales <100ka. This natural alteration has been simulated incorporating...
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