Hi Some info on Lizard Rocks. Note Peridotite is available at Kennack Sands and Serpeninites in many places Anybody interested to do some beach tests pls let us know.
http://www.google.co.uk/url?sa=t&rct=j&q=&esrc=s&frm=1&source=web&cd=3&ved=0CC4QFjAC&url=http%3A%2F%2Fprojects.exeter.ac.uk%2Fgeomincentre%2F06The%2520Lizard.pdf&ei=Ob3IVP6wHIP7ygPQgYEo&usg=AFQjCNF7nnTVPFde9JHL0W6aIAYz_onbGA Parminder <http://www.google.co.uk/url?sa=t&rct=j&q=&esrc=s&frm=1&source=web&cd=3&ved=0CC4QFjAC&url=http%3A%2F%2Fprojects.exeter.ac.uk%2Fgeomincentre%2F06The%2520Lizard.pdf&ei=Ob3IVP6wHIP7ygPQgYEo&usg=AFQjCNF7nnTVPFde9JHL0W6aIAYz_onbGA> N.B. I like to thank Kevin Privett for sending me this link. <http://www.google.co.uk/url?sa=t&rct=j&q=&esrc=s&frm=1&source=web&cd=3&ved=0CC4QFjAC&url=http%3A%2F%2Fprojects.exeter.ac.uk%2Fgeomincentre%2F06The%2520Lizard.pdf&ei=Ob3IVP6wHIP7ygPQgYEo&usg=AFQjCNF7nnTVPFde9JHL0W6aIAYz_onbGA> On Wednesday, January 28, 2015 at 9:16:16 PM UTC+8, Schuiling, R.D. (Olaf) wrote: > > I think that not everybody realizes that some 300 million tons of CO2 > are captured every year by the weathering of basic silicates, notably the > most common one, olivine. To demonstrate this, the diagram below shows the > analytical data of some 20 spring water samples in olivine rocks in Turkey. > It shows what happens when rain falls on soils on top of olivine rocks. The > rainwater contains essentially only some CO2 and has a pH in the order of > 6. Then it penetrates the soil, which has much higher CO2 concentrations in > the soil atmosphere than in the atmosphere above. Dead plant material is > decaying, the soil fauna is breathing, both releasing CO2, so the CO2 > concentration of the soil atmosphere is often hundred times or more higher > than in the atmosphere. The water equilibrates with this high CO2 > concentration. Then it seeps into the rock, and reacts with it, releasing > magnesium to the solution, and the pH rises to values around 7.5 to 8.5. > This weathering reaction can be written as > > > > Mg2SiO4 + 4 CO2 + 4 H2O à 2 Mg2+ + 4 HCO3- + H4SiO4 (so the CO2 is > captured as bicarbonate in solution). > > > > At some point this water is emitted again as a spring. This spring water > is very healthy, and we often had to wait in line for the many people who > collect this spring water in containers and jerrycans to bring home. Most > of the water flows away in small brooks, and finally reaches the sea, where > the calcium and magnesium are used by plankton, corals and shellfish to > form limestones and dolomites, the ultimate sustainable storage of the CO2. > > Just as an afterthought: so if we irrigate semi-arid land on top of > olivine massifs, we have a cheap way to fix CO2 by increasing the number > and the volume of springs in such rocks, Olaf Schuiling > > I attach the paper in which these data were published > > > > \ > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > ® > > > > > > > > Fig.1: Concentration in meq [Ca2+ + Mg2+] in spring waters. Total carbon > as mg CO2. > > ® composition of rain water. > > > -- 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 [email protected]. To post to this group, send email to [email protected]. Visit this group at http://groups.google.com/group/geoengineering. For more options, visit https://groups.google.com/d/optout.
