EX1603 (Papahānaumokuākea Marine National Monument )

EX1603 cruise of the Okeanos Explorer – Hohonu Moana: Exploring the Deep Waters Off Hawaiʻi

NOAA expedition EX1603 sampled seamounts in the deep waters of the Papahānaumokuākea Marine National Monument of the Pacific using the submersible Deep Discoverer. OSU marine repository archives the rock samples collected during the expedition. Archived samples include basalts, fossil corals, phosphorites and more. Below are the samples recovered from each dive. 

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

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

Go back to the EX1603 map or the NOAA collections page

 

EX1603-D1 (Necker Seamount)
 

Sample Location Rock Type Description Whole Rock Image TS Image TSX Image
OSU-EX1603-D1-1 23.5745°N, 164.03°W Basalt A fresh basalt with coarse plagioclase grains…
OSU-EX1603-D1-2 23.57462°N, 164.031°W Welded tuff A highly altered tuff with shards of plagioclase rich basalts…

 

EX1603-D2 (French Frigate Shoals)
 

Sample Location Rock Type Description Whole Rock Image TS Image TSX Image
OSU-EX1603-D2-1 23.94569°N, 166.04°W Welded Tuff Likely a lithofied ash bed but could potentially be sediment/substrate…

 

EX1603-D3 (Pioneer Bank)
 

Sample Location Rock Type Description Whole Rock Image TS Image TSX Image
OSU-EX1603-D3-1 25.43°N, 173.54°W Basalt A olivine rich basalt with a glassy rind…
OSU-EX1603-D3-2 25.43°N, 173.54°W Basalt A plagioclase and olivine phyric basalt…

 

EX1603-D4 (North Pioneer Bank)
 

Sample Location Rock Type Description Whole Rock Image TS Image TSX Image
OSU-EX1603-D4-2 26.15°N, 173.36°W Basalt A altered basalt with olivine phenocrysts, which are 100% recrystallized to iddingsite…
OSU-EX1603-D4-4 26.15°N, 173.36°W Basalt A plagioclase basalt that has been altered to a mixture of palagonite clasts and clay rich alteration…

 

EX1603-D5 (Unnamed Seamount)
 

Sample Location Rock Type Description Whole Rock Image TS Image TSX Image
OSU-EX1603-D5-1 26.64°N, 175.4°W Sandstone Thin section appears to represent a quartz rich sedimentary rock with pockets of clay rich alteration…
OSU-EX1603-D5-3 26.65°N, 175.4°W Altered Sediment A highly altered and brittle/fragile conglomerate with chunks of greenish clay and some Mn… No thin section No thin section

 

EX1603-D6 (Unnamed Seamount)
 

Sample Location Rock Type Description Whole Rock Image TS Image TSX Image
OSU-EX1603-D6-1 26.99°N, 176.85°W Basalt A altered glassy basalt with clinopyroxene phenocrysts…

 

EX1603-D7 (Castellano Seamount)
 

Sample Location Rock Type Description Whole Rock Image TS Image TSX Image
OSU-EX1603-D7-1 26.43°N, 177.8°W Basalt A olivine basalt with olivine recrystallized to iddingsite…
OSU-EX1603-D7-3 26.43°N, 177.8°W Basalt A olivine basalt with a gabbroic xenolith…

 

EX1603-D8 (Unnamed Seamount)
 

Sample Location Rock Type Description Whole Rock Image TS Image TSX Image
OSU-EX1603-D8-1 25.36°N, 178.43°W Basalt A plagioclase phyric basalt with a groundmass composed of finer plagioclase and altered mesostasis…
OSU-EX1603-D8-3 25.36°N, 178.43°W Basalt A plagioclase phyric basalt with a altered glass, spinel and plagioclase groundmass…