Geofluids

Research Article

Understanding the Compositional Variability of the Major Components of Hydrothermal Plumes in the Okinawa Trough

Table 2

Major component ratios of hydrothermal plume water columns in the middle and southern Okinawa Trough.


	Iheya North		Clam		Yonaguni Knoll IV		Tangyin		Average seawater
	Average	Range	Average	Range	Average	Range	Average	Range	Average seawater

Sr²⁺/Ca²⁺	0.008 ()	0.007–0.011	0.008 ()	0.008–0.009	0.009 ()	0.008–0.010	0.009 ()	0.008–0.009	0.009
Mg²⁺/Cl^-	0.095 ()	0.091–0.099	0.094 ()	0.090–0.097	0.093 ()	0.091–0.095	0.092 ()	0.087–0.096	0.097
Mn²⁺/Cl^-	–	–	–	–	2.97 × 10⁻⁸ ()	1.89 × 10⁻⁹–1.13 × 10⁻⁷	–	–	–
Mg²⁺/Ca²⁺	5.40 ()	4.97–5.82	5.28 ()	5.01–5.68	5.32 ()	5.08–5.56	5.38 ()	5.19–5.56	5.17
B³⁺/Ca²⁺	0.038 ()	0.033–0.050	0.037 ()	0.034–0.040	0.048 ()	0.043–0.054	0.039 ()	0.036–0.041	0.040
Ca²⁺/Cl^-	0.018 ()	0.016–0.019	0.018 ()	0.017–0.019	0.017 ()	0.016–0.019	0.017 ()	0.016–0.018	0.019
Ca²⁺/salinity	0.291 ()	0.263–0.320	0.298 ()	0.283–0.316	0.291 ()	0.278–0.307	0.287 ()	0.275–0.306	0.293
Mg²⁺/salinity	1.57 ()	1.48–1.69	1.57 ()	1.51–1.62	1.55 ()	1.51–1.58	1.54 ()	1.49–1.62	1.52
/salinity	0.793 ()	0.760–0.860	0.801 ()	0.775–0.820	0.796 ()	0.779–0.810	0.800 ()	0.772–0.816	0.807
Mn²⁺/salinity	–	–	2.07 × 10⁻⁴ ()	2.81 × 10⁻⁵–10.8 × 10⁻⁴	4.92 × 10⁻⁴ ()	3.18 × 10⁻⁵–1.88 × 10⁻³	–	–	2.08 × 10⁻⁴
B³⁺/salinity	0.011 ()	0.010–0.013	0.011 ()	0.010–0.015	0.014 ()	0.013–0.015	0.011 ()	0.011–0.012	0.012
Na⁺/salinity	14.4 ()	13.2–16.0	14.5 ()	13.4–15.5	14.5 ()	13.5–15.2	14.2 ()	13.3–15.1	13.4
Total S/salinity	0.831 ()	0.783–0.889	0.838 ()	0.807–0.879	0.816 ()	0.785–0.855	0.804 ()	0.788–0.834	0.806
K⁺/salinity	0.301 ()	0.282–0.326	0.303 ()	0.288–0.316	0.307 ()	0.295–0.327	0.305 ()	0.284–0.321	0.286
Sr²⁺/salinity	2.47 ()	2.13–2.89	2.51 ()	2.29–2.84	2.60 ()	2.44–2.75	2.52 ()	2.44–2.65	2.64
Cl^-/salinity	16.6 ()	15.9–17.8	16.7 ()	16.3–17.0	16.7 ()	16.5–17.0	16.8 ()	16.4–17.2	15.6
F^-/salinity	0.021 ()	0.019–0.024	0.020 ()	0.017–0.022	0.019 ()	0.018–0.025	0.020 ()	0.018–0.023	0.020
Potential density/salinity	0.775 ()	0.681–0.793	0.784 ()	0.697–0.794	0.785 ()	0.677–0.794	0.784 ()	0.672–0.794	–

“–”: no data. Average seawater data from Turekian [50] and Millero [4].