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Papahānaumokuākea Marine National Monument: Main Hawaiian Islands and Geologists Seamounts

EX1504L3

NOAA expedition EX1504 Leg 3 sampled seamounts in the Papahānaumokuākea Marine National Monument, specifically targeting Hawaiian and Geologist Seamounts using the submersible Deep Discoverer. OSU marine repository archives the rock samples collected during the expedition. Archived samples include basalts, fossil corals, breccias and more. Below are the samples recovered from each dive.

For more information please visit the dedicated NOAA Page and Background Information

Go back to the NOAA collections page.

Dive sample tables: click to expand

Collection Metadata
IGSNLatitudeLongitudeDepth (m)Feature NamePrincipal Rock TypeTemp (C)Salinity (PSU)Oxygen (mg/l)
OSU-EX1504L3-D2-319.8-156.13388Kona Precious Coral BedCoral8.1834.212.55
OSU-EX1504L3-D4-118.98-157.112699McCall SeamountBasalt1.6734.643.63
OSU-EX1504L3-D4-318.98-157.112643McCall SeamountBasalt1.5734.673.76
OSU-EX1504L3-D4-418.98-157.112634McCall SeamountBasalt1.5734.673.74
OSU-EX1504L3-D5-118.31-158.461071Swordfish SeamountBasalt3.6934.541.8
OSU-EX1504L3-D5-418.31-158.45969Swordfish SeamountConglomerate4.0134.411.63
OSU-EX1504L3-D5-618.31-158.45973Swordfish SeamountBasalt4.3334.441.53
OSU-EX1504L3-D6-119.23-157.612135Ellis SeamountBasalt1.9834.643.05
OSU-EX1504L3-D6-219.23-157.612125Ellis SeamountBasalt1.9834.643
EX1504L3-D2 (Kona Precious Coral Bed)
Sample Location Rock Type Description Images
OSU-EX1504L3-D2-3 19.8°N, 156.13°W Coral A couple pieces of fossilized coral. Image 4Image 4Image 4Image 4Image 4Image 4Image 4Image 4Image 4
EX1504L3-D4 (McCall Seamount)
Sample Location Rock Type Description Images
OSU-EX1504L3-D4-1 18.98°N, 157.11°W Basalt A coarse grained basalt with occasional very large plagioclase crystals (~15mm)… Image 2Image 3Image 4Image 4Image 4Image 4Image 4Image 4Image 4Image 4Image 4Image 4
OSU-EX1504L3-D4-3 18.98°N, 157.11°W Basalt A aphyric basalt with vesicles and fractures with pervasive calcite infill… Image 2Image 3Image 4Image 4Image 4Image 4Image 4Image 4Image 4Image 4Image 4Image 4
OSU-EX1504L3-D4-4 18.98°N, 157.11°W Basalt A trachytic basalt with rare coarse plagioclase phenocrysts… Image 2Image 3Image 4Image 4Image 4Image 4Image 4Image 4Image 4Image 4
EX1504L3-D5 (Swordfish Seamount)
Sample Location Rock Type Description Images
OSU-EX1504L3-D5-1 18.31°N, 158.46°W Basalt A fairly fresh plagioclase rich basalt (likely traychitic) with small amphibole and clinopyroxene microcrysts… Image 2Image 3Image 4Image 4Image 4Image 4Image 4Image 4Image 4Image 4Image 4Image 4Image 4
OSU-EX1504L3-D5-4 18.31°N, 158.46°W Conglomerate A phosphorite with altered clasts and one fairly fresh clast. Thin section is from the fairly fresh clast… Image 2Image 3Image 4Image 4Image 4Image 4Image 4Image 4Image 4Image 4Image 4Image 4Image 4
OSU-EX1504L3-D5-6 18.31°N, 158.46°W Basalt A plagioclase rich basalt with both microcrysts (<0.4mm) and phenocrysts (0.8-1.6mm)... Image 2Image 3Image 4Image 4Image 4Image 4Image 4Image 4
EX1504L3-D6 (Ellis Seamount)
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Sample Location Rock Type Description Images
OSU-EX1504L3-D6-1 19.23°N, 157.61°W hyaloclastite A highly altered hyaloclastite with ocassional olivine phenocrysts (100% recrystallized to iddingsite)… Image 2Image 3Image 4Image 4Image 4Image 4Image 4Image 4Image 4Image 4Image 4Image 4Image 4Image 4Image 4Image 4Image 4Image 4
OSU-EX1504L3-D6-2 19.23°N, 157.61°W basalt A plagioclase rich basalt with subtrachytic textures… Image 2Image 3Image 4Image 4Image 4Image 4Image 4Image 4Image 4Image 4Image 4