Presentation Details
Evidence for amorphous calcium carbonate originated mid-lithospheric discontinuities
ID：1350
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Updated Time：2024-04-11 14:58:53 Hits：1609
Poster Presentation
Start Time：2024-05-18 08:48（Asia/Shanghai）
Duration：1min
Session：SP 张贴报告专场 »
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Abstract
Cratonic lithosphere is a vast host for deep recycled carbon, trapping up to several weight percent CO2 among its compositions at depths overlapping the seismic mid-lithospheric discontinuities (MLDs). However, the role of carbonates, especially for the latest discovered amorphous calcium carbonate (CaCO3), 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 CaCO3 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 (VP) and shear (VS) wave velocities, respectively. The VP and VS values of the amorphous CaCO3 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 CaCO3 would readily cause MLDs at depths of 70–120 km dependent on the geotherm even if only 1-2 vol.% CaCO3 presents in the cratonic lithosphere. The CaCO3-originated MLDs is weak so as to be expected to influence the stability, rifting, and delamination of the craton.
Keywords
碳循环
Speaker
侯明强
研究员 中国科学院精密测量科学与技术创新研究院Submission Author
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Important Date
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Conference Date
May 17
2024
toMay 20
2024
-
Mar 31 2024
Draft paper submission deadline
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Mar 31 2024
Contribution Submission Deadline
-
May 20 2024
Registration deadline
Sponsored By
青年地学论坛理事会
Organized By
厦门大学近海海洋环境科学国家重点实验室
中国科学院城市环境研究所
自然资源部第三海洋研究所
中国科学院城市环境研究所
自然资源部第三海洋研究所
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