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A comment on What made Earth a giant snowball 700M years ago? Scientists have an answer. Parent comment
2 CO2 + H2O + CaSiO3 -> Ca^2+ + 2HCO3- + SiO2
and
Ca^2+ + 2HCO3- -> CaCO3 + CO2 + H2O
https://en.wikipedia.org/wiki/Carbonate%E2%80%93silicate_cyc...
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2 CO2 + H2O + CaSiO3 -> Ca^2+ + 2HCO3- + SiO2
and
Ca^2+ + 2HCO3- -> CaCO3 + CO2 + H2O
https://en.wikipedia.org/wiki/Carbonate%E2%80%93silicate_cyc...