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Table 1 Deep-sea serpentinization-associated geofluid fields

From: Cool, alkaline serpentinite formation fluid regime with scarce microbial habitability and possible abiotic synthesis beneath the South Chamorro Seamount

Name of field South Chamorro Seamount (SCS) Shinkai Seep Field Lost City Rainbow
Location 13°47 ′N–146°00′E 11°40′N–140°03′E 30°07′N–42°07′W 36°14′N–33°54′W
Tectonics Forearc seamount chain Non-accretionary trench slope Oceanic core complex, MAR Non-transform offset, MAR
Driving force Serpentine mud volcanism (Hydrothermalism?) Hydrothermalism Hydrothermalism
Fluid source Slab-derived fluid Seawater penetration Seawater penetration Seawater penetration
Approach ODP, CORK, Dive Dive Dive, IODP Dive
Depth (m) 2960 5800 700–800 2300
T max 2 > 91 365
pH 12.5 (Brucite chimney) 10.7 2.8
H2 (mM) 0.01 (possibly < 40) 15 16
CH4 (mM) 37 (possibly < 65) 2 2.5
Note The strongest alkaline deep-sea geofluid system so far identified. See text for details. Active alkaline fluid seeping from brucite chimney surrounded by macrofauna colony. Hot alkaline fluid discharging from tall carbonate chimney, only identified on the modern seafloor at this moment. Black smoker acidic fluid discharging from sulfide chimney with abundant H2. Similar vent sites have already been found on the modrern seafloor.
Ref See text Ohara et al. 2012 Kelley et al. 2001 Charlou et al. 2002
   Stern et al. 2014 Früh-Green et al. 2003  
   Okumura et al., 2016a
Onishi et al. 2018
Proskurowski et al. 2008