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> Now, thanks to newly developed research tools at Cornell, scientists have learned that gaseous carbon dioxide can trigger explosive eruptions So, is gaseous

by klyrs 3y ago

> Now, thanks to newly developed research tools at Cornell, scientists have learned that gaseous carbon dioxide can trigger explosive eruptions So, is gaseous CO2 sequestration a bad idea, because it causes explosive volcanos, or a good idea, because volcanism causes global cooling?

JumpCrisscross 3y ago
> is gaseous CO2 sequestration a bad idea, because it causes explosive volcanos The paper [1] found "oceanic intraplate mafic eruptions are sustained from the mantle by high volatile concentrations inherited from their source and that deep CO2 exsolution (here up to ~800 MPa) drives their ascent and explosivity" [1]. 800 MPa occurs in the upper mantle, around 30 km below the Earth's surface [2]. (CO2 is being discussed for sequestration around 73 atm [4], or about 8 MPa, at depths that might approach 3 km.) So yes, if we start pumping CO2 into the ocean floor at almost triple the depth of the deepest borehole we've ever dug [3], and then superpressurize it, it could create a problem. [1] https://www.pnas.org/doi/10.1073/pnas.2302093120 https://www.pnas.org/doi/10.1073/pnas.2302093120 [2] https://www.geo.arizona.edu/xtal/geos306/geotherm.htm https://www.geo.arizona.edu/xtal/geos306/geotherm.htm [3] https://en.wikipedia.org/wiki/Kola_Superdeep_Borehole https://en.wikipedia.org/wiki/Kola_Superdeep_Borehole [4] https://www.netl.doe.gov/carbon-management/carbon-storage/faqs/carbon-storage-faqs#:~:text=Carbon%20dioxide%20(CO2)%20can,critical%20point%20for%20CO2 https://www.netl.doe.gov/carbon-management/carbon-storage/fa....
- jychang 3y ago
  > up to 800 MPa The words “up to” would imply lesser pressures would work.
  - JumpCrisscross 3y ago
    Esolution means gasification. Of course lower pressures work. If the CO2 is already gas, it isn’t explosive; the phase transition is. If you aren’t injecting hyperpressurised CO2 near the mantle, this is a total red herring.

by klyrs 3y ago

JumpCrisscross 3y ago

> is gaseous CO2 sequestration a bad idea, because it causes explosive volcanos The paper [1] found "oceanic intraplate mafic eruptions are sustained from the mantle by high volatile concentrations inherited from their source and that deep CO2 exsolution (here up to ~800 MPa) drives their ascent and explosivity" [1]. 800 MPa occurs in the upper mantle, around 30 km below the Earth's surface [2]. (CO2 is being discussed for sequestration around 73 atm [4], or about 8 MPa, at depths that might approach 3 km.) So yes, if we start pumping CO2 into the ocean floor at almost triple the depth of the deepest borehole we've ever dug [3], and then superpressurize it, it could create a problem. [1] https://www.pnas.org/doi/10.1073/pnas.2302093120 https://www.pnas.org/doi/10.1073/pnas.2302093120 [2] https://www.geo.arizona.edu/xtal/geos306/geotherm.htm https://www.geo.arizona.edu/xtal/geos306/geotherm.htm [3] https://en.wikipedia.org/wiki/Kola_Superdeep_Borehole https://en.wikipedia.org/wiki/Kola_Superdeep_Borehole [4] https://www.netl.doe.gov/carbon-management/carbon-storage/faqs/carbon-storage-faqs#:~:text=Carbon%20dioxide%20(CO2)%20can,critical%20point%20for%20CO2 https://www.netl.doe.gov/carbon-management/carbon-storage/fa....

jychang 3y ago
> up to 800 MPa The words “up to” would imply lesser pressures would work.
- JumpCrisscross 3y ago
  Esolution means gasification. Of course lower pressures work. If the CO2 is already gas, it isn’t explosive; the phase transition is. If you aren’t injecting hyperpressurised CO2 near the mantle, this is a total red herring.