Cruise Report (PDF, 4.8Mb) - NOAA, Ocean Explorer

J416 Sample Log
sample
name type Location date hr min vv lat vv long
J416-sed-01 geo near landing
J416-sed-02 geo near landing
J416-rock-03 geo
traveling up
N slope
47
vv
rec
5/9
2009 04 37 -15.389232 -174.253560 3113 129 2 1815
5/9
2009 04 42 -15.389234 -174.253574 3121 129 2 1815
5/9
2009 05 19 -15.390445 -174.252966 3203 125 3 1743
hd
g alt jasZ J416 Sample Comments (NELSC and Maka) PI
~12 cm long pushcore. The entire core is dominantly
glass, but planktic foraminifers and rare diatoms are
present in each subsection as well. The character of
the coarse glass changes through the core with only
rare limu o Pele in the basal portions, increasing upsection.
Pele’s hairs are very rare in the entire core,
although more abundant in the fine fractions. The
pyroclasts near the bottom are mostly scoria to finely
vesicular fragments that approach pumice. There are
no obvious flow fragments or other lithic fragments in
the core, although some scoria fragments are altered
to a white amorphous silica(?). Additional fragments,
particularly near the bottom, are coated with brown
hydrothermal precipitates, but most glass is fresh
throughout the core. The glasses are all light brown
in color. Each subsection has about twice as much
material in the >500 micron fraction as in the 63-500
micron fraction. Zero age? yes/no
Small scoop sample that consists almost entirely of
glass fragments of pyroclastic origin. The largest
fragments are cm-sized, but about half the sample is
0.063-0.5 mm in size. A significant amount passed
through the 63 micron sieve. Limu o Pele fragments
are fairly rare and Pele’s hairs absent. Some of the
fragments are stained reddish brown, but most are
fresh. Plnktic foraminifers are common, comprising a
percent or so of the bulk sample. The finer fraction
contains abundant lava ribbons. Zero age? yes/no
Piece of a plate?. Small fragment of older material
with iron oxide staining on other surfaces. 1 cm thick
glass rind. Looks fairly vesicular. Sampled while
climbing up the north side of the ridge toward the
ridge crest. Not suspected to be zero age.
geo
group
geo
group
geo
group