Abstract: Mineral carbon sequestration by volcanic rocks, providing a permanent sequestration solution for reducing atmospheric CO₂, is one of an economic and safe way of carbon capture and storage (CCS). Volcanic rocks are widely distributed in China, but research on the carbon sequestration potential of volcanic rocks is still very limited. In this paper, we selected the volcanic rocks of Leizhou Peninsula, Guangdong Province as the study area, and used MapGis software to establish a vector geographic information database of the thickness distribution of volcanic rocks in Leizhou Peninsula, and interpolated to obtain a three- dimensional gridded data body. The results show that the total area of volcanic rocks in Leizhou Peninsula is approximately 3940 km², with a total volume of 257 km³, and calculated results of the theoretical CO₂ mineralization storage capacity ranges from 1.9 to 45.9 billion tons. Among them, the volcanic rocks in the Leinan area have the largest potential, with the theoretical storage capacity ranging from 1.3 to 32.6 billion tons, followed by volcanic rocks in the area east of Suixi County in Leibei and west of Zhanjiang City, with the capacity from 0.2 to 5.6 billion tons. Although the theoretical storage capacity of volcanic rocks in the Donghai Island area is relatively small (0.15 to 3.5 billion tons), they have a good source-to-sink matching condition due to their proximity to the surrounding industrial emission sources, and so they also have good CCS prospects. The results of this study not only provide an important basis for the screening site of CO₂ mineralization volcanic rocks, but also offer support for future development of regional CCS projects or industries.

Key words: volcanic rocks；mineral carbonation, storage potential, assessment methodology, Leizhou Peninsula