Hi, Schuilling carried out experiments where modest surf action was imitated by having olivine grains rotate slowly along the bottom of an Erlenmeyer, the water turned an opaque white after a few days of rotation, the pH of the solution had gone up, and many of the slivers had already turned into neoformed grains of brucite, a mineral known to carbonate fast.
As for beaches you can find them in Hawaii, Turkey, Galapagos Is. just a few to mention. Regards, Parminder On Wednesday, October 1, 2014 11:19:31 AM UTC+8, Greg Rau wrote: > > Agree that the silicate mineral sand idea needs testing. I'd first start > in the lab with a flask of freshly ground olivine in chemically well > characterized, sterile seawater. I would then put this on a shaker table in > the dark and let the sand and water gently slosh back and forth for a few > days and then measure the SW alkalinity and DIC again. this would give you > and idea of the efficacy and kinetics under ideal conditions. Measuring > this in a beach setting would be trickier, but possible. My guess is that > there are synergies with sediment respiration/microbes that hasten silicate > weathering. Add in some fresh sediment to the above flask and see what > happens. > > Greg > > ------------------------------ > *From:* Andrew Lockley <andrew....@gmail.com <javascript:>> > *To:* geoengineering <geoengi...@googlegroups.com <javascript:>> > *Sent:* Tuesday, September 30, 2014 11:28 AM > *Subject:* [geo] Natural olivine beaches > > Hi > The proposal for olivine weathering on beaches seems to pass a common > sense test. > However, there's been a lack of detailed discussion about the occurrence > and function of natural olivine beaches, as far as I'm aware. > There are a lot of beaches in the world. Olivine is pretty common. How > much of a sink is natural beach chemical and mechanical weathering of > olivine? > It should be easy to find at least one location where there's massive > quantities of olivine sand, and take detailed measurements on the carbon > sink. > I know there's at least one such beach in the literature, but I can't > recall discussions of others, nor detailed quantitative research on erosion > and sequestration rates at this site > Can someone enlighten me as to why this has seemingly been overlooked for > detailed study? > A > -- > You received this message because you are subscribed to the Google Groups > "geoengineering" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to geoengineerin...@googlegroups.com <javascript:>. > To post to this group, send email to geoengi...@googlegroups.com > <javascript:>. > Visit this group at http://groups.google.com/group/geoengineering. > For more options, visit https://groups.google.com/d/optout. > > > -- You received this message because you are subscribed to the Google Groups "geoengineering" group. To unsubscribe from this group and stop receiving emails from it, send an email to geoengineering+unsubscr...@googlegroups.com. To post to this group, send email to geoengineering@googlegroups.com. Visit this group at http://groups.google.com/group/geoengineering. For more options, visit https://groups.google.com/d/optout.
