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• W4316505864 abstract "Abstract Cratonic lithosphere is a vast host for deep recycled carbon, trapping up to several weight percent CO 2 among its compositions 1,2 at depths overlapping the seismic mid-lithospheric discontinuities (MLDs) 3-5 . However, the role of carbonates, especially for the latest discovered amorphous calcium carbonate (CaCO 3 ) 6 , is underestimated in forming MLDs. Using the pulse-echo-overlap method in a Paris-Edinburgh press coupled with X-ray diffraction, we explored the acoustic velocities of CaCO 3 under high pressure-temperature ( P-T ) conditions relevant to the cratonic lithosphere. Two anomalous velocity drops were observed associated with the phase transition from aragonite to amorphous phase as well as with pressure-induced velocity drop in amorphous phase around 3 GPa, respectively. Both drops are comparable with approximately 35% and 52% reductions for compressional ( V P ) and shear ( V S ) wave velocities, respectively. The V P and V S values of the amorphous CaCO 3 above 3 GPa are about 1/2 and 1/3 of those of the major upper-mantle minerals, respectively, and they are the same with aragonite below 3 GPa. These velocity reduction by the presence of CaCO 3 would readily cause MLDs at depths of 70–120 km dependent on the geotherm even if only 1-2 vol.% CaCO 3 presents in the cratonic lithosphere. The CaCO 3 -originated MLDs is weak so as to be expected to influence the stability, rifting, and delamination of the craton 7 ." @default.
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• W4316505864 date "2023-01-16" @default.
• W4316505864 modified "2023-10-02" @default.
• W4316505864 title "Evidence for amorphous calcium carbonate originated mid-lithospheric discontinuities" @default.
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• W4316505864 doi "https://doi.org/10.21203/rs.3.rs-2352031/v1" @default.
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