“…The Lost City field records 30 000 years of hydrothermal activity driven by serpentinization reactions producing carbonate-brucite chimneys, low temperature venting (∼40-75°C) and high pH fluids (9-10) Früh-Green et al, 2003;Ludwig et al, 2006). The higher temperature ultramafic-rock hosted systems, Rainbow and Logatchev, exhibit mixed features between sediment-starved basalt-hosted systems with high bulk-rock Cu/Zn ratios, high Cu and Co and low Pb and Ni (Table 5), and ultramafic-hosted systems with high methane anomalies and ubiquitous serpentinization reactions within the host rocks (Batuyev et al, 1994;Bogdanov et al, 1995;Donval et al, 1997;Mozgova et al, 1999;Marques et al, 2006).…”