EX1504L4 (Johnston Atoll)

Leg 4 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

EX1504L4-D2 (SW Niiahu Pinnacle)
 

Sample Location Rock Type Description Whole Rock Image TS Image TSX Image
OSU-EX1504L4-D2-1 21.81°N, 160.29°W Basalt Sample contains coarser grained plagioclase and olivine with a fairly altered groundmass…
EX1504L4-D3 (Karin Seamount East Ridge)

 

Sample Location Rock Type Description Whole Rock Image TS Image TSX Image
OSU-EX1504L4-D3-1 17.66°N, 168.67°W Basalt A pervasively altered sample with some plagioclase phenocrysts and altered groundmass with some plagioclase…
OSU-EX1504L4-D3-2 17.66°N, 168.67°W Basalt A heavily altered plagioclase basalt…
OSU-EX1504L4-D3-4 17.66°N, 168.67°W Hyaloclastite A phosphate rich conglomerate (hyaloclastite?) with olivine-basaltic clasts that are 100% recrystallized…
EX1504L4-D4 (Johnston Atoll)

 

Sample Location Rock Type Description Whole Rock Image TS Image TSX Image
OSU-EX1504L4-D4-2 16.66°N, 169.35°W Coral A large fossilized coral. No thin section No thin section
EX1504L4-D5 (Johnston Seamounts-Deep Twin Ridge)

 

Sample Location Rock Type Description Whole Rock Image TS Image TSX Image
OSU-EX1504L4-D5-1 15.64°N, 169.49°W Basalt A basalt with olivine, titan-augite and spinel phenocrysts…
OSU-EX1504L4-D5-3 15.64°N, 169.49°W Basalt A highly altered basalt with olivine phenocrysts that are completely recrystallized to iddingsite…
EX1504L4-D6 (Two Cones)

 

Sample Location Rock Type Description Whole Rock Image TS Image TSX Image
OSU-EX1504L4-D6-1 15.47°N, 169.07°W Hyaloclastite The sample consists of multiple centimeter sized basalt clasts that vary from aphyric to olivine-plagioclase clasts…
OSU-EX1504L4-D6-2 15.47°N, 169.07°W Hyaloclastite A large highly altered basalt clast within a hyaloclastite matrix…
OSU-EX1504L4-D6-4 15.47°N, 169.07°W Conglomerate A highly altered phosphorite with a few basaltic clasts found within…
OSU-EX1504L4-D6-5 15.47°N, 169.07°W Hyaloclastite A hyaloclastite with phosphate cement…
EX1504L4-D7 (Southern-most Cones)

 

Sample Location Rock Type Description Whole Rock Image TS Image TSX Image
OSU-EX1504L4-D7-2 15.21°N, 168.06°W Hyaloclastite A heavily altered conglomerate or hyaloclastite…
OSU-EX1504L4-D7-3 15.21°N, 168.06°W Hyaloclastite A hyaloclastite with palagonite and serpenite alteration throughout…
OSU-EX1504L4-D7-5 15.21°N, 168.06°W Mn-Crust A chunk of manganese crust. No thin section No thin section
EX1504L4-D8 (Lone Cone)

 

Sample Location Rock Type Description Whole Rock Image TS Image TSX Image
OSU-EX1504L4-D8-2 15.59°N, 167.75°W Sediment A chunk of phosphate with some altered reddish clasts throughout.
OSU-EX1504L4-D8-4 15.59°N, 167.75°W Hyaloclastite A hyaloclastite with phosphate(?) infill and palognite alteration halos around basaltic clasts…
EX1504L4-D9 (South Karin Ridge)

 

Sample Location Rock Type Description Whole Rock Image TS Image TSX Image
OSU-EX1504L4-D9-1 16.14°N, 167.85°W Basalt A heavily altered ankaramite with completely recrystalized olivine and clinopyroxene…
OSU-EX1504L4-D9-5 16.14°N, 167.85°W Basalt A heavily altered greyish basalt with a few clinopyroxene grains that contain alteration rims…
EX1504L4-D10 (Mid-Karin Ridge)

 

Sample Location Rock Type Description Whole Rock Image TS Image TSX Image
OSU-EX1504L4-D10-1 16.54°N, 168.21°W Basalt A heavily altered aphyric basalt with large circular vesicles…
EX1504L4-D11 (Karin Ridge Top)

 

Sample Location Rock Type Description Whole Rock Image TS Image TSX Image
OSU-EX1504L4-D11-1 17.50°N, 168.74°W Basalt A aphyric basalt with large circular vesicles that are infilled with calcite…
OSU-EX1504L4-D11-2 17.50°N, 168.74°W Basalt A aphyric basalt with rounded irregular vesicles…
EX1504L4-D12 (Abyssal Ridge)

 

Sample Location Rock Type Description Whole Rock Image TS Image TSX Image
OSU-EX1504L4-D12-1 17.61°N, 169.64°W Basalt A heavily altered vesicular olivine basalt…
OSU-EX1504L4-D12-2 17.61°N, 169.64°W Basalt A heavily altered ankaramite…
OSU-EX1504L4-D12-4 17.61°N, 169.64°W Basalt A altered and vesicular ankaramite…
OSU-EX1504L4-D12-5 17.61°N, 169.64°W Basalt A olivine basalt (?) that is heavily altered with palagonite…
OSU-EX1504L4-D12-6 17.61°N, 169.64°W Basalt A heavily altered basalt with a few plagioclase grains still intact…
EX1504L4-D13 (Guyot Ridge - NW Karin Plateau)
 

Sample Location Rock Type Description Whole Rock Image TS Image TSX Image
OSU-EX1504L4-D13-1 18.12°N, 169.00°W Basalt A plagioclase rich basalt with trachytic textures…
OSU-EX1504L4-D13-2 18.12°N, 169.00°W Basalt A basalt with trace plagioclase and olivine (iddingsite) phenocrysts…