The Earth’s mantle is the major reservoir of volatiles such as C and S that, in the form of CO2 and SO2 are the major carriers of mercury (Hg) to the atmosphere [Edwards et al., 2021]. A preliminary database built up from literature data allows us to draw a global Hg cycle [Yin et al. 2024]; however, there are no available data to constrain the Deep Mercury Cycle (DMC). The aim of this study is to constrain the origin and the end of the DMC through an updated database that combines Hg fluxes from volcanic and seismic areas, along with currently available Hg concentrations in natural rocks. The majority of mantle and crustal rocks are Hg depleted (up to 68 ppb and 47 ppb, respectively) [Yin et al., 2024] with respect to sedimentary rocks (up to 36750 ppb) [Grasby et al., 2019; Yin et al., 2024] testifying the role of magma degassing and the Hg precipitation from gaseous phases that represents among the main mechanisms of Hg enrichment in sedimentary rocks. The high volatility of mantle-derived Hg is also highlighted by the few data available on Hg volcanic emissions ranging from 0.01 ton·yr-1 to over 350 ton·yr-1 [Edwards et al., 2021]. However, recently remote sensing techniques has allowed to estimate a possible global budget of Hg volcanic emissions (232 ton·yr-1) [Geyman et al., 2023]. An updated Hg database of natural emissions will be presented, and the results discussed in comparison with the known anthropogenic Hg production.
The Deep Mercury Cycle: an updated database of natural sources against anthropogenic emissions / Benedetti, Federica; Marras, Giulia; Brandano, Marco; Calabrese, Sergio; Bosi, Vittorio; Ricciardi, Antonio; Stagno, Vincenzo. - 81:(2024), pp. 88-88. (Intervento presentato al convegno 2nd Congress of Società geochimica Italiana "From theory to applied geochemistry" tenutosi a Perugia) [10.13127/misc/81].
The Deep Mercury Cycle: an updated database of natural sources against anthropogenic emissions
Benedetti Federica;Marras Giulia;Brandano Marco;Stagno Vincenzo
2024
Abstract
The Earth’s mantle is the major reservoir of volatiles such as C and S that, in the form of CO2 and SO2 are the major carriers of mercury (Hg) to the atmosphere [Edwards et al., 2021]. A preliminary database built up from literature data allows us to draw a global Hg cycle [Yin et al. 2024]; however, there are no available data to constrain the Deep Mercury Cycle (DMC). The aim of this study is to constrain the origin and the end of the DMC through an updated database that combines Hg fluxes from volcanic and seismic areas, along with currently available Hg concentrations in natural rocks. The majority of mantle and crustal rocks are Hg depleted (up to 68 ppb and 47 ppb, respectively) [Yin et al., 2024] with respect to sedimentary rocks (up to 36750 ppb) [Grasby et al., 2019; Yin et al., 2024] testifying the role of magma degassing and the Hg precipitation from gaseous phases that represents among the main mechanisms of Hg enrichment in sedimentary rocks. The high volatility of mantle-derived Hg is also highlighted by the few data available on Hg volcanic emissions ranging from 0.01 ton·yr-1 to over 350 ton·yr-1 [Edwards et al., 2021]. However, recently remote sensing techniques has allowed to estimate a possible global budget of Hg volcanic emissions (232 ton·yr-1) [Geyman et al., 2023]. An updated Hg database of natural emissions will be presented, and the results discussed in comparison with the known anthropogenic Hg production.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.