Now Playing Tracks

Using Naturally Occurring Olivine to Sequester Carbon Emissions

Based on Nature News & Comment Nature 505, 464 (23 January 2014)

'Weathering’, or breaking down, of rocks is a hugely important but very slow part of the carbon cycle. Natural weathering locks up atmospheric carbon dioxide by means of chemical reactions between common silicate minerals and air.

For example, when magnesium-rich olivine, a rock of particular interest to geoengineers, is brought together with CO2 and water under natural conditions, the resulting reaction forms magnesium carbonate and silicic acid, thereby removing and storing carbon.

Some scientists think that this natural process could be exploited to offset at least some of the carbon emitted by human activities. Rather than waiting for rocks to be slowly weathered away, olivine could be mined on an industrial scale, ground up, and spread over land or in the sea, speeding up these chemical reactions and sucking vast quantities of CO2 out of the atmosphere.

One obvious way to try this is to do something nature already does. Make more green sand beaches!  Scatter the crushed olivine on beaches everywhere …

There are now only four natural olivine-sand beaches.

  • Papakolea Beach in Hawaii
  • Talofofo Beach, Guam
  • Punta Cormorant Beach in the Galapagos Islands
  • Hornindalsvatnet in Norway, the deepest lake in Europe.

Green sand gets its name from the green glassy crystals of olivine that make up a significant part of it. The olivine in the sand on these beaches comes from olivine-rich lava, as seen in the partially weathered lava in the TOP IMAGE.

Olivine is
the most abundant mineral in the Earth’s mantle, down to about 410 km below the surface. It is a common component of lava.

Lab experimentation has shown that under pressures found 360 km below the surface of the earth, olivine can absorb a great deal of water.  Because olivine is so abundant, it may be that more water is dissolved in subsurface olivine than is contained in Earth’s oceans.

Olivine is a magnesium iron silicate with the formula (Mg+2, Fe+2)2 SiO4. Check out olivine in Wikipedia 

Photo of Hawaii’s Papakolea Beach by Shannon Lucas 
Other images:
Nature and Wikimedia

66 notes

  1. landothelost reblogged this from dragember
  2. dragember reblogged this from mucholderthen
  3. gnaremishi reblogged this from mucholderthen and added:
    Get in Oahu :3 I KNOW WHERE :D
  4. lsptrip reblogged this from smartpeopleposting
  5. callipygianology reblogged this from geologista
  6. diademof12stars reblogged this from geologista
  7. geologista reblogged this from scienthusiasts
  8. heartforthesea reblogged this from coliesciandra
  9. necromantic-1030 reblogged this from smartpeopleposting
  10. thehuvvingtonpost reblogged this from scienthusiasts
  11. scienthusiasts reblogged this from smartpeopleposting
  12. smartpeopleposting reblogged this from mucholderthen
  13. moji-moji reblogged this from mucholderthen
  14. heated-glances reblogged this from mucholderthen
  15. kammartinez reblogged this from mucholderthen
  16. celebrateyourowndecay reblogged this from mucholderthen
  17. razbarree reblogged this from mucholderthen
  18. nickdangerprivatethirdeye reblogged this from falseinnocence and added:
    Hey, that’s my birth stone!
  19. wind-and-the-rain reblogged this from hydroment1064
  20. hydroment1064 reblogged this from mucholderthen
  21. shafeshafe reblogged this from mucholderthen
  22. not-a-sinner-not-a-saint reblogged this from falseinnocence
  23. monsterface reblogged this from mucholderthen
  24. falseinnocence reblogged this from mucholderthen
  25. arahith reblogged this from mucholderthen
  26. coliesciandra reblogged this from mucholderthen
To Tumblr, Love Pixel Union