Origin and transport of pore fluids in the Nankai accretionary prism inferred from chemical and isotopic compositions of pore water at cold seep sites off Kumano

Earth, Planets and Space

Table 4 Chemical and isotopic compositions of end members for the estimation in this study

Sources	C1⁻	B mmol/kg	δ¹⁸O_H2O‰ VSMOW	δD_H2O‰ VSMOW	Reference
SW	547 ± 8	0.4116 ± 0.015	−0.09 ± 0.21	+1.1 ± 1.0	This study
CMD	0	23 ± 8	ND	ND	Toki et al. [2013]
SPF	549 ± 4	0.217 ± 0.057	−2.5 ± 0.4	−10.0 ± 2.8	Expedition 315 Scientists [2009a]
MH	0	0	+0.6 ± 0.4	+8.0 ± 2.8	Expedition 315 Scientists [2009a]; Maekawa [2004]
Oomine	498	1.3	−0.4	−3.4	This study

SW, seawater; CMD, clay mineral dehydration; SPF, shallow pore fluid; MH, methane hydrate; Oomine, D949 C3-3; ND, not determined.