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Fig. 7
Photos of representative samples from dives 6 K#274 (
a
,
c
) and #277 (
b
,
d
). Cut surfaces
(
a
,
b
) and thin sections (
c
,
d
) showing brecciation and calcite veins and cement. Mudstone brec-
cias can be seen to occur within the calcite cemented part (
b
,
d
) (From Ogawa et al.
1996
)
Pelagic ooze
Nankai cement (Anma)
Methane-derived cements
Fig. 8
Oxygen and carbon isotope ratios (
PDB
), analyzed by Tadamichi Oba. The dotted line is
a regression line, excluding the upper two data points (from Kuwano et al.
1997
). The domains of
calcite cements are indicated by dashed ellipses: (
lower right
) methane-derived cements from the
Nankai trough (Sakai et al.
1992
), and (
top right
) pelagic ooze and (
top left
) Nankai trough cement
from Shionomisaki Canyon (From Anma et al. (
2011
))
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