[HN Gopher] Carbon dioxide - not water - triggers explosive volc...
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Carbon dioxide - not water - triggers explosive volcanoes
Author : geox
Score : 4 points
Date : 2023-08-09 19:17 UTC (3 hours ago)
(HTM) web link (news.cornell.edu)
(TXT) w3m dump (news.cornell.edu)
| klyrs wrote:
| > 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 wrote:
| > _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
|
| [2] https://www.geo.arizona.edu/xtal/geos306/geotherm.htm
|
| [3] https://en.wikipedia.org/wiki/Kola_Superdeep_Borehole
|
| [4] https://www.netl.doe.gov/carbon-management/carbon-
| storage/fa....
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(page generated 2023-08-09 23:03 UTC)