Johnston Atoll

EX1504L4

NOAA expedition EX1504 Leg 4 sampled seamounts in the deep waters of the Johnston Atoll region 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

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-EX1504L4-D2-121.81-160.29567.37SW Niihau PinnacleBasalt6.1334.221.7
OSU-EX1504L4-D3-117.66-168.673184.06Karin Seamount East RidgeBasalt1.5634.73.86
OSU-EX1504L4-D3-217.66-168.673162.12Karin Seamount East RidgeBasalt1.5734.673.82
OSU-EX1504L4-D3-417.66-168.683049.22Karin Seamount East RidgeBasalt1.5434.673.84
OSU-EX1504L4-D4-216.66-169.351269.79Johnston AtollCoral3.5434.561.62
OSU-EX1504L4-D5-115.63-169.492429.32Johnston Seamounts-DeepTwin RidgeBasalt1.8134.663.48
OSU-EX1504L4-D5-315.64-169.492356.96Johnston Seamounts-DeepTwin RidgeBasalt1.934.653.3
OSU-EX1504L4-D6-115.47-169.071671.94Two ConesBasalt2.6734.62.54
OSU-EX1504L4-D6-215.47-169.071529.99Two ConesBasalt3.0134.592.29
OSU-EX1504L4-D6-415.46-169.081508.02Two ConesConglomerate2.7434.62.44
OSU-EX1504L4-D6-515.46-169.081508.02Two ConesBasalt2.7434.62.44
OSU-EX1504L4-D7-215.21-168.061893.92Southern-most ConesBasalt2.3134.632.79
OSU-EX1504L4-D7-315.21-168.061843.43Southern-most ConesBasalt2.3434.622.76
OSU-EX1504L4-D7-515.2-168.061747.09Southern-most ConesFe-Mn Crust2.5334.612.55
OSU-EX1504L4-D8-215.59-167.752074.5Lone ConeSedimentary2.1834.632.92
OSU-EX1504L4-D8-415.59-167.751832.53Lone ConeBasalt2.3734.622.68
OSU-EX1504L4-D9-116.14-167.861969.31South Karin RidgeBasalt2.0734.643.04
OSU-EX1504L4-D9-516.14-167.851929.28South Karin RidgeBasalt2.2734.632.8
OSU-EX1504L4-D10-116.54-168.212324.08Mid Karin RidgeBasalt2.0334.643.11
OSU-EX1504L4-D11-117.5-168.742168.45Karin Ridge TopBasalt1.8834.653.32
OSU-EX1504L4-D11-217.5-168.742106.37Karin Ridge TopBasalt2.1134.632.97
OSU-EX1504L4-D12-117.61-169.644238.06Abyssal RidgeBasalt1.4634.694.49
OSU-EX1504L4-D12-217.61-169.654237.59Abyssal RidgeBasalt
OSU-EX1504L4-D12-417.61-169.644096.58Abyssal RidgeBasalt1.4634.694.37
OSU-EX1504L4-D12-517.61-169.644059.62Abyssal RidgeBasalt
OSU-EX1504L4-D12-617.61-169.644062.33Abyssal RidgeBasalt1.4734.694.27
OSU-EX1504L4-D13-118.12-1692104.05Guyot Ridge (NW Karin Plateau)Basalt1.8634.653.28
OSU-EX1504L4-D13-218.12-1691971.51Guyot Ridge (NW Karin Plateau)Basalt2.1434.632.89
EX1504L4-D2 (SW Niiahu Pinnacle)
EX1504L4-D4 (Johnston Atoll)
Sample Location Rock Type Description Images
OSU-EX1504L4-D4-2 16.66°N, 169.35°W Coral A large fossilized coral. Image 4Image 4Image 4Image 4Image 4Image 4Image 4Image 4Image 4
EX1504L4-D10 (Mid-Karin Ridge)
Sample Location Rock Type Description Images
OSU-EX1504L4-D10-1 16.54°N, 168.21°W Basalt A heavily altered aphyric basalt with large circular vesicles… Image 2Image 3Image 4Image 4Image 4Image 4Image 4Image 4Image 4Image 4Image 4