3 ms·
So I guess you end up with finely-divided carbonate. I didn't notice any mention of how long it takes powdered basalt to weather down. Is that over a year?
by denton-scratch 3y ago
So I guess you end up with finely-divided carbonate.
I didn't notice any mention of how long it takes powdered basalt to weather down. Is that over a year?
- vonwolfhausen 3y agoCan be <5 years if it is super fine (~25um) or >20 years if it is coarse (minus 3/8" fines).
- kisamoto 3y agoTo reach maximum sequestration rate I thought it was much longer than that (~95% within 30 years at 3um). Where did you get your numbers from (curious, always looking for more sources)?
- denton-scratch 3y agoI seem to be wrong about the result of basalt-weathering being carbonates. https://en.wikipedia.org/wiki/Basalt#Weathering https://en.wikipedia.org/wiki/Basalt#Weathering It seems that basalt consists mainly of metal oxides, predominantly Fe, Ca, Mg and Al. How does carbonic acid from rain get bound into basalt, without dissolving in the next rainstorm? (My knowledge of chemistry is restricted to "A" level, what Americans would call High School; and I've forgotten it all, because it was 40 years ago). The article says that basalts weather down into clays, which aren't carbonates.