Comparative Cr and Mn speciation across a shore-to-reef gradient in lagoon sediments downstream of Cr-rich Ferralsols upon ultramafic rocks in New Caledonia

A methodological framework to study the behavior and kinetic influence of V, Mn, Co, Ni, Cu, Zn, As, Se and Mo during pyrite formation via the polysulfide pathway at ambient temperature

“…For instance, Baldermann et al (2015) have shown the importance of green-clay authigenesis in the sequestration of Fe in modern deep-sea sediments. Moreover, (Merrot et al, 2019) reported that such a process can also largely control the fate of Ni in lagoon sediments, while carbonates play a key role in sequestrating Mn in the same environments (Merrot et al, 2021). Additionally, recent works from Chen and Campbell (2021) have shown that the enrichment factors depicted by Large et al (2014) and Mukherjee and Large (2020), e.g.…”

Heterocapsa cf. bohaiensis (dinoflagellate): identification and response to nickel and iron stress revealed through chlorophyll a fluorescence

“…New Caledonia is a tropical island located in the Southwest Pacific with coastal waters enriched in trace metals (Ambatsian et al 1997, Le Grand et al 2013). Indeed, one-third of the main land surface is covered by ultramafic substrates rich in nickel, iron, chrome, cobalt, and manganese trace metals but poor in nitrogen, phosphorus, and potassium (Pelletier 2007, Merrot 2019. These metals are naturally present in coastal ecosystems due to leaching and natural erosion via ultramafic catchments (Bird et al 1984, Biscéré et al 2017, Merrot et al 2022.…”