Give them a baloon and they will be happy.
Synthesis of heavy hydrocarbons at the core-mantle boundary by CO2 + H2O.
In this study we have attempted to answer what happens to a H 2 O-CO 2 (C-O-H) mixture subjected to high pressure and temperature in contact with rocks.
Several studies point to the possibility of CH 4 formation in the upper mantle. Indeed, flow of methane of abiotic origin is well documented.
Experiments have demonstrated the transition of CH4 (Methane) into heavy hydrocarbons in the absence of oxygen .
Whether the C-C bond characteristic to heavy hydrocarbons will emerge in a H 2 O-CO 2 mixture under the conditions of deep Earth interior remains unknown.
Such a bond, if formed, would indicate a possibility of endogenic oil synthesis.
The mixture of H2O and CO2 subjected to high pressure (130 GPa) and temperature (4000 to 4500 K) alone does not lead to synthesis of complex hydrocarbons.
However, when Fe is added to the system, C-C bonds emerge.
While formation of abiotic methane in nature is known, for the first time we demonstrate the synthesis of hydrocarbons with a C-C bond
under conditions that are typical of the Earth core-mantle boundary.
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4682099/pdf/srep18382.pdf
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Synthesis of heavy hydrocarbons at the core-mantle boundary by FeO + H2O + CaCO3.