Laulima O Ka Moana: Exploring Deep Monument Waters Around Johnston Atoll

EX1706

NOAA expedition EX1706 sampled seamounts and seafloor features in the deep waters around the Johnston Atoll using the submersible Deep Discoverer. OSU marine repository archives the rock samples collected during the expedition. Archived samples include basalts, breccias and ferromanganese crusts. 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-EX1706-D3-218.15-169.732561.65Unnamed Seamount N. of Johnston AtollFeMn Crust1.7934.653.43
OSU-EX1706-D3-318.15-169.732561.42Unnamed Seamount N. of Johnston AtollBasalt1.7934.653.36
OSU-EX1706-D5-316.20-169.562158.25"Sally" SeamountVolcanic breccia1.9934.643.09
OSU-EX1706-D5-416.20-169.562150.98"Sally" SeamountBreccia2.0034.643.18
OSU-EX1706-D6-115.68-169.481245.43Keli RidgeBasalt4.0434.541.97
OSU-EX1706-D6-215.68-169.481220.31Keli RidgeBasalt4.1034.541.86
OSU-EX1706-D7-115.68-170.371275.00Edmonson SeamountBasalt3.8134.551.86
OSU-EX1706-D7-215.68-170.371156.99Edmonson SeamountBasalt4.2934.541.74
OSU-EX1706-D8-215.47-171.991553.81Pierpont SeamountBreccia3.0234.582.27
OSU-EX1706-D8-2a15.47-171.991553.81Pierpont SeamountBasalt3.0234.582.27
OSU-EX1706-D8-315.47-171.991527.78Pierpont SeamountBasalt2.9334.592.36
OSU-EX1706-D9-115.17-171.252569.68Wetmore SeamountFeMn Crust1.7834.653.57
OSU-EX1706-D9-415.17-171.252542.42Wetmore SeamountBasalt1.7834.654.07
OSU-EX1706-D10-115.04-170.872064.94Wetmore Seamount Part 2FeMn Crust2.1334.633.04
OSU-EX1706-D10-315.04-170.872065.44Wetmore Seamount Part 2Breccia2.1534.633.13
OSU-EX1706-D11-114.47-170.862439.01Ridge SeamountFeMn Crust1.8234.653.39
OSU-EX1706-D11-314.47-170.862402.93Ridge SeamountBasalt1.8434.653.02
OSU-EX1706-D12-114.53-169.922321.93Sleep Hallow SeamountBasalt1.8534.653.66
OSU-EX1706-D12-314.53-169.922256.51Sleep Hallow SeamountBasalt1.9934.643.18
OSU-EX1706-D13-114.06-169.321569.19Volcanic Cone on GuyotHyaloclastite2.9634.592.30
OSU-EX1706-D13-314.06-169.321501.25Volcanic Cone on GuyotHyaloclastite3.0534.582.28
OSU-EX1706-D14-115.09-167.962546.31Southeast Guyot RidgeBasalt1.6434.663.82
OSU-EX1706-D14-215.09-167.962430.90Southeast Guyot RidgeBreccia1.8534.643.40
OSU-EX1706-D15-215.16-167.051804.62New Seamount 8 ConeHyaloclastite2.2034.625.21
OSU-EX1706-D15-315.15-167.041804.62New Seamount 8 ConeFeMn Crust2.1934.632.82
EX1706-D3 (Unnamed Seamount N. of Johnston Atoll)

 

Sample Location Rock Type Description Images
OSU-EX1706-D3-2 18.15°N, 169.73°W Ferromanganese Crust A thick FeMn crust with veins of phosphorite throughout… Image 2Image 3Image 4Image 5Image 6Image 7Image 8Image 9
OSU-EX1706-D3-3 18.15°N, 169.73°W Three-Phase Basalt A highly altered alkaline basalt… Image 2Image 3Image 4Image 5Image 6Image 7Image 8Image 9
EX1706-D5 (Sally Seamount)
Sample Location Rock Type Description Images
OSU-EX1706-D5-3 16.20°N, 169.56°W Volcanic Breccia Altered plagioclase basalt clasts within a thick phosphorite matrix… Image 2Image 3Image 4Image 5Image 6
OSU-EX1706-D5-4 16.20°N, 169.56°W Breccia A breccia containing a variety of lithologic clasts… Image 2Image 3Image 4Image 5Image 6
EX1706-D6 (Keli Ridge)
Sample Location Rock Type Description Images
OSU-EX1706-D6-1 15.68°N, 169.48°W Spinel-Clinopyroxene Basalt A alkali-basalt with both clinopyroxene and spinel macrocrysts… Image 2Image 3Image 4Image 5Image 6
OSU-EX1706-D6-2 15.68°N, 169.48°W Phyric Basalt A clinopyroxene phyric basalt with ultramafic xenoliths… Image 2Image 3Image 4
EX1706-D8 (Pierpont Seamount)
Sample Location Rock Type Description Images
OSU-EX1706-D8-2 15.47°N, 171.99°W Breccia A true breccia containing at least six different lithologies… Image 2Image 3Image 4Image 5Image 6Image 7Image 8
OSU-EX1706-D8-2a 15.47°N, 171.99°W Plagioclase Basalt A hydrothermally altered plagioclase basalt separated from D8-2… Image 2Image 3
OSU-EX1706-D8-3 15.47°N, 171.99°W Biotite-Plagioclase Basalt A biotite and plagioclase phyric basalt… Image 2Image 3Image 4Image 5Image 6Image 7Image 8Image 9Image 10
EX1706-D10 (Wetmore Seamount)
EX1706-D11 (Ridge Seamount)
EX1706-D13 (Volcanic Cone on Guyot)
Sample Location Rock Type Description Images
OSU-EX1706-D13-1 14.06°N, 169.32°W Hyaloclastite A hyaloclastite with phosphorite cement… Image 2Image 3Image 4Image 5Image 6Image 7Image 8Image 9Image 10
OSU-EX1706-D13-3 14.06°N, 169.32°W Hyaloclastite A hyaloclastite with phosphorite cement… Image 2Image 3Image 4Image 5Image 6Image 7Image 8Image 9
EX1706-D14 (Southeast Guyot Ridge)
EX1706-D15 (New Seamount 8 Cone)
Sample Location Rock Type Description Images
OSU-EX1706-D15-2 15.16°N, 167.05°W Hyaloclastite A glassy hyaloclastite that contains thick phosphorite and FeMn cement… Image 2Image 3Image 4Image 5Image 6Image 7Image 8Image 9Image 10Image 11
OSU-EX1706-D15-3 15.16°N, 167.04°W Ferromanganese Crust A solid piece of FeMn crust… Image 2Image 3Image 4Image 5Image 6Image 7Image 8Image 9