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Fig. 4
Sea-floor geological map of the Ohmachi seamount. Dive and dredge trails and localities
of rock samples (including floats) by lithotypes are shown
Fig. 5
Representative lithofacies of the Ohmachi Seamount. (
a
) Schistose serpentinite (dive
6K#1064) with foliation gently dipping to the south. (
b
) Schistose serpentinite (6K#1066) with
near-vertical foliation. (
c
) Jointed massive serpentinite (6K#1065). (
d
) Locally brecciated serpen-
tinite in contact with unfractured massive serpentinite (transitionally schistose in thin section;
6K#1068). (
e
) Locality of an amphibole schist float (6K#609R002) collected from rock debris
(
dark part: arrowed
) covered by recent calcareous mud (
light colored
), both exposed on a landslide
scarp in the slope apron. (
f
) Sub-horizontally stratified outcrop near the base of the Paleogene
volcanic sequence, consisting of reworked volcanic breccia (
lower
) and felsic tuff (
upper
), observed
during the dive 6K#609. (
g
) Scanned thin section of a limestone float (6K#1065R003) of shallow-
marine origin showing molds of dissolved colonial corals mostly filled by secondary calcite. (
h
)
Cut surface of a float of turbidite (6K#1064R007)
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