Plagioclase-regulated hydrothermal alteration of basaltic rocks with implications for the South China Sea rifting

Reactivity and Dissolution Characteristics of Naturally Altered Basalt in CO2-Rich Brine: Implications for CO2 Mineralization

“…The basaltic rocks in CarbFix were relatively fresh and composed mainly of pyroxenes, plagioclase, and olivine, , which are known to be highly reactive minerals . However, fresh basaltic rocks are restricted to active volcanic systems and rift zones, and most widespread basaltic rocks have undergone varying degrees of alteration through reactions with hydrothermal fluids. , In Japan, many oil and gas field reservoirs located on the Sea of Japan side of the Northeast Japan Arc are associated with basaltic rocks that erupted and were deposited on the seafloor during the Early to Middle Miocene and Late Miocene to Pliocene periods . These reservoirs have undergone natural alteration, diagenesis, and hydrothermal activities under high geothermal gradients. , Although the use of existing wells in oil and gas fields for CO 2 storage is both technically and economically advantageous, the feasibility and effectiveness of using such altered basaltic formations for CO 2 mineralization remain uncertain.…”

“… 14 However, fresh basaltic rocks are restricted to active volcanic systems and rift zones, and most widespread basaltic rocks have undergone varying degrees of alteration through reactions with hydrothermal fluids. 15 , 16 In Japan, many oil and gas field reservoirs located on the Sea of Japan side of the Northeast Japan Arc are associated with basaltic rocks that erupted and were deposited on the seafloor during the Early to Middle Miocene and Late Miocene to Pliocene periods. 17 These reservoirs have undergone natural alteration, diagenesis, and hydrothermal activities under high geothermal gradients.…”