EX1504L2 (Papahānaumokuākea Marine National Monument )

Leg 2 of the EX1504 cruise of the Okeanos Explorer

View and download data by expanding each of the dive sites below

Go back to the EX1504 map or the NOAA collections page

EX1504L2-D1 (East Necker Seamount)

 

Sample Location Rock Type Description Whole Rock Image TS Image TSX Image
OSU-EX1504L2-D1-1 23.22°N, 163.52°W Basalt An aphanitic basalt with large, up to ~1mm, vesicles…
OSU-EX1504L2-D1-2 23.22°N, 163.52°W Basalt An aphanitic and vesicular basalt…
EX1504L2-D2 (North French Frigate Shoals Seamount)

 

Sample Location Rock Type Description Whole Rock Image TS Image TSX Image
OSU-EX1504L2-D2-3 24.46°N, 166.09°W Basalt A olivine phyric basalt that grades into a glassy flow top…
OSU-EX1504L2-D2-4 24.46°N, 166.09°W Basalt An olivine-basalt with coarse, fairly fresh olivine phenocrysts…
EX1504L2-D3 (St. Rogatien Rift Zone Ridge)

 

Sample Location Rock Type Description Whole Rock Image TS Image TSX Image
OSU-EX1504L2-D3-3 25.63°N, 167.24°W Basalt A olivine-basalt with a heavily altered glassy groundmass…
EX1504L2-D4 (Maro Crater)

 

Sample Location Rock Type Description Whole Rock Image TS Image TSX Image
OSU-EX1504L2-D4-1 25.16°N, 169.88°W Phosphorite A heavily altered phosphite rich rock…
OSU-EX1504L2-D4-2 25.16°N, 169.88°W Hyaloclastite A hyaloclastite or conglomerate with a manganese crust and basalt clasts within a heavily altered sedimentary matrix…
EX1504L2-D5 (Southeast Maro Ridge)

 

Sample Location Rock Type Description Whole Rock Image TS Image TSX Image
OSU-EX1504L2-D5-1 24.58°N, 169.91°W Sedimentary Rock The rock is difficult to tell if it’s a completely altered basaltic rock or some fine grained altered sedimentary rock…
EX1504L2-D6 (West Northampton Ridge)

 

Sample Location Rock Type Description Whole Rock Image TS Image TSX Image
OSU-EX1504L2-D6-1 25.08°N, 172.49°W Basalt A highly vesicular basalt with plagioclase-olivine glomerocrystic microcrysts within a glassy matrix…
OSU-EX1504L2-D6-3 25.08°N, 172.49°W Basalt A vesicular basalt with rare clinopyroxene microcrysts…
EX1504L2-D7 (Pioneer Bank Ridge)

 

Sample Location Rock Type Description Whole Rock Image TS Image TSX Image
OSU-EX1504L2-D7-1 25.51°N, 173.52°W Basalt An olivine-basalt with two plagioclase laths (5mm long)…
OSU-EX1504L2-D7-4 25.51°N, 173.52°W Basalt A olivine-basalt with plagioclase and glass…
EX1504L2-D8 (Bank 9 South)

 

Sample Location Rock Type Description Whole Rock Image TS Image TSX Image
OSU-EX1504L2-D8-2 26.83°N, 175.61°W Basalt A basaltic hyaloclastite (or some conglomerate) that is nearly 100% recystallized into various alteration phases.
OSU-EX1504L2-D8-3 26.83°N, 175.61°W Basalt A picrite with very large, fairly decent olivine in a matrix that is 100% altered.
EX1504L2-D9 (East Salmon Bank)

 

Sample Location Rock Type Description Whole Rock Image TS Image TSX Image
OSU-EX1504L2-D9-1 27.14°N, 176.23°W Basalt A highly altered basalt with some plagioclase grains. Likely more evolved than a basalt, possibly a trachyite.
OSU-EX1504L2-D9-2 27.14°N, 176.23°W Basalt A trachytic textured basalt with aligned plagioclase…
OSU-EX1504L2-D9-4 27.14°N, 176.23°W Basalt A trachyitic basalt with a high density of plagioclase (~85%) within a altered matrix…
EX1504L2-D10 (Salmon Bank Ridge)

 

Sample Location Rock Type Description Whole Rock Image TS Image TSX Image
OSU-EX1504L2-D10-1 26.82°N, 176.31°W Basalt A aphanitic basalt with ~0.5mm vesicles…
EX1504L2-D11 (Bank 9 North)

 

Sample Location Rock Type Description Whole Rock Image TS Image TSX Image
OSU-EX1504L2-D11-1 27.13°N, 175.57°W Basalt A highly phyric picrite with only minor iddingsite recystallization…
OSU-EX1504L2-D11-2 27.13°N, 175.57°W Basalt A picrite with fairly fresh olivine…
EX1504L2-D12 (Southeast Pearl & Hermes Atoll)

 

Sample Location Rock Type Description Whole Rock Image TS Image TSX Image
OSU-EX1504L2-D12-2 27.52°N, 175.46°W Sediment A chunk of alteration, likely an igneous rock at some point but currently unrecognizable…
OSU-EX1504L2-D12-4 27.52°N, 175.46°W Basalt An unsual rock with radiating plagioclase and a mineral (likely clinopyroxene) with common intergrowth patterns…
EX1504L2-D13 (Unnamed Seamount)

 

Sample Location Rock Type Description Whole Rock Image TS Image TSX Image
OSU-EX1504L2-D13-1 27.85°N, 175.16°W Basalt A plagioclase rich basalt with very large circular vesicles that are completely filled with calcite…
OSU-EX1504L2-D13-3 27.85°N, 175.16°W Basalt A plagioclase rich basalt with large vesicles in a highly altered matrix…
EX1504L2-D14 (North Pioneer Ridge)

 

Sample Location Rock Type Description Whole Rock Image TS Image TSX Image
OSU-EX1504L2-D14-1 26.20°N, 173.33°W Basalt A highly altered basalt with plagioclase and clinopyroxene grains that are fairly fresh…
OSU-EX1504L2-D14-4 26.20°N, 173.33°W Basalt A fine grained olivine-basalt with olivine phenocrysts completely recrystallized to iddingsite…
EX1504L2-D15 (North Maro Ridge)
 

Sample Location Rock Type Description Whole Rock Image TS Image TSX Image
OSU-EX1504L2-D15-1 25.81°N, 171.10°W Basalt An olivine rich basalt with a groundmass composed of fine pyroxene and magnetite with some microcrystic plagioclase…
OSU-EX1504L2-D15-3 25.81°N, 171.10°W Basalt An olivine phyric basalt with olivine phenocrysts that range from complete to neglible serpentine recrystallization…
EX1504L2-D17 (East North Gardner)

 

Sample Location Rock Type Description Whole Rock Image TS Image TSX Image
OSU-EX1504L2-D17-1 25.88°N, 167.78°W Basalt A very coarse grained fresh basalt with plagioclase, clinopyroxene and olivine…
OSU-EX1504L2-D17-3 25.88°N, 167.78°W Basalt A conglomerate with a phosphorite matrix and a olivine-basalt clast within…
EX1504L2-D18 (West Nihoa)

 

Sample Location Rock Type Description Whole Rock Image TS Image TSX Image
OSU-EX1504L2-D18-1 23.18°N, 162.46°W Basalt A olivine and plagioclase phyric basalt…