EX1605L1 – Deepwater Exploration of the Marianas: The Southern Half

NOAA expedition EX1605L1 sampled hydrothermal vent sites, mud volcanoes, deep-sea coral and seamounts in and around the southern Marianas Trench Marine National Monument (MTMNM) and the Commonwealth of the Northern Mariana Islands (CNMI). Samples were obtained using the submersible Deep Discoverer. OSU marine repository archives the rock samples collected during the expedition. Archived samples include basalts, fossil corals, sulfides 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 NOAA collections page

EX1605L1-D1 (Santa Rosa North)
Sample Location Rock Type Description Whole Rock Image TS Image TSX Image
OSU-EX1605L1-D1-1 12.86°N, 144.30°E Basalt A plagioclase and clinopyroxene phyric basalt…
OSU-EX1605L1-D1-2 12.86°N, 144.31°E Carbonate A very fine grained sediment containing carbonate fossils…
EX1604L1-D2 (Santa Rosa South)
Sample Location Rock Type Description Whole Rock Image TS Image TSX Image
OSU-EX1605L1-D2-2 12.73°N, 144.27°E Coral A very fine grained brownish sediment containing carbonate fossils…
OSU-EX1605L1-D2-3 12.73°N, 144.27°E Coral A fossil coral… No thin section No thin section
EX1605L1-D3 (Sirena Canyon)
Sample Location Rock Type Description Whole Rock Image TS Image TSX Image
OSU-EX1605L1-D3-1 12.54°N, 144.61°E Basalt A coarse-grained basalt (sill?) that contains olivine-plagioclase-clinopyroxene and spinel in roughly eutectic proportions…
OSU-EX1605L1-D3-3 12.54°N, 144.61°E Substrate A very fine grained sedimentary rock with a slightly coarser grained layer that contains fossils and few minerals…
EX1605L1-D4 (Enigma Seamount)
Sample Location Rock Type Description Whole Rock Image TS Image TSX Image
OSU-EX1605L1-D4-1 11.42°N, 144.78°E Breccia A hyaloclastite, fractured pillow basalt, or breccia that is composed of completely altered glassy basaltic clasts…
OSU-EX1605L1-D4-2 11.42°N, 144.78°E Breccia A hyaloclastite or breccia that is composed of completely altered glassy basaltic clasts…
OSU-EX1605L1-D4-4 11.42°N, 144.78°E Basalt A fine grained basalt that contains at least one recrystallized olivine phenocryst…
EX1605L1-D5 (Fina Nagu Caldera)
Sample Location Rock Type Description Whole Rock Image TS Image TSX Image
OSU-EX1605L1-D5-1 12.69°N, 143.75°E Andesite A fresh andesite with glomerocrystic plagioclase, spinel, orthopyroxene and clinopyroxene clusters…
OSU-EX1605L1-D5-2 12.69°N, 143.75°E Basalt/Andesite A fresh basalt (or andesite) with glomerocrystic clusters of plagioclase, clinopyroxene and spinel…
OSU-EX1605L1-D5-5 12.70°N, 143.75°E Basalt/Andesite A basalt with plagioclase and some finer clinopyroxene phenocrysts in a fairly altered fine grained matrix…
EX1605L1-D6 (Fina Nagu Caldera)
Sample Location Rock Type Description Whole Rock Image TS Image TSX Image
OSU-EX1605L1-D6-1 12.80°N, 143.78°E Basalt A basalt with a few plagioclase microcrysts in a matrix of plagioclase, clinopyroxene, and a glassy mesostasis…
OSU-EX1605L1-D6-3 12.80°N, 143.79°E Basalt A aphyric basalt that contains numerous vesicles with clay infill…
EX1605L1-D7 (Fina Nagu Caldera)
Sample Location Rock Type Description Whole Rock Image TS Image TSX Image
OSU-EX1605L1-D7-1 12.86°N, 144.83°E Sediment A mottled mixture of clay, Fe-Mn and sulfides…
OSU-EX1605L1-D7-3 12.86°N, 144.83°E Basalt A fine grained basalt with a few plagioclase microcrysts…
EX1605L1-D8 (NW Guam)
Sample Location Rock Type Description Whole Rock Image TS Image TSX Image
OSU-EX1605L1-D8-2 14.02°N, 144.64°E Basalt A highly crystalline (~60%) basalt with plagioclase, olivine and clinopyroxene phenocrysts…
EX1605L1-D9 (Unnamed Lava Flows)
Sample Location Rock Type Description Whole Rock Image TS Image TSX Image
OSU-EX1605L1-D9-1 15.44°N, 144.51°E Basalt An interesting glassy basalt with the glass rim partly to entirely composed of reddish spherulitic alteration patterns…
OSU-EX1605L1-D9-2 15.44°N, 144.50°E Basalt A plagioclase basalt with some olivine phenocrysts…
OSU-EX1605L1-D9-3 15.44°N, 144.50°E Basalt A plagioclase basalt with a dark glassy matrix…
EX1605L1-D10 (New Hydrothermal Vent Field 1)
EX1605L1-D11 (New Hydrothermal Vent Field 1)
Sample Location Rock Type Description Whole Rock Image TS Image TSX Image
OSU-EX1605L1-D11-1 16.96°N, 144.87°E Sulfide Deposit A granular sulfide deposit, mostly yellowish-green but contains regions of reddish and black deposits…
EX1605L1-D13 (Kunanaf Hulo)
Sample Location Rock Type Description Whole Rock Image TS Image TSX Image
OSU-EX1605L1-D13-1 16.03°N, 147.11°E Serpentinite A serpentinized mafic rock…
EX1605L1-D14 (Pigafetta Guyot)
Sample Location Rock Type Description Whole Rock Image TS Image TSX Image
OSU-EX1605L1-D14-1 15.90°N, 148.89°E Basalt A olivine (iddingsite) and plagioclase phyric basalt with a groundmass consisting of coarse plagioclase grains and a reddish recrystallized mesostasis…
EX1605L1-D15 (Enrique Guyot)
Sample Location Rock Type Description Whole Rock Image TS Image TSX Image
OSU-EX1605L1-D15-1 15.00°N, 148.52°E Basalt A igneous rock (basalt most likely) that consists of plagioclase grains in a grey matrix of Fe-hydroxide alteration…
EX1605L1-D17 (Farallon De Menidilla)
Sample Location Rock Type Description Whole Rock Image TS Image TSX Image
OSU-EX1605L1-D17-2 16.13°N, 146.08°E Coral A large piece of fossil coral… No thin section No thin section