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Index to Marine and Lacustrine Geological Samples

Repository: URI Latitude: 12.29672 to 12.29772
Ship: Thomas G. Thompson Longitude: 143.85693 to 143.86199
Cruise: TN273 Water Depth(m): 3945 to 3766
Sample: TN273-34D Date: 20120116 to 20120116
Device: dredge, rock PI: Katherine Kelly
Storage: room temperature, dry IGSN: URI900252

25kg of lava. 1/2 bag full of subangular rocks. Collected from a forearc rift, SE Mariana forearc rift, fault scarp in S.

Contact URI TN273 data at R2R
1 :    IGSN URI900253  
Lithology and Mineralogy: igneous (extrusive/volcanic), basalt
Weathering / Metamorphism: weathering - light
Glass and remarks: some samples with fresh glass & Mn/Fe oxide coatings
Comments: Sample TN273-34D-01-01. Rift bottom. altered basalts, <1% by volume 1mm in diameter vesicles, microcrystalline, subangular blocks, occasional <1mm thick glassy rim, 50cm in size
2 :    IGSN URI900254  
Lithology and Mineralogy: igneous (extrusive/volcanic), basalt
Weathering / Metamorphism: weathering - light
Glass and remarks: some samples with fresh glass & Mn/Fe oxide coatings
Comments: Sample TN273-34D-01-02. Rift bottom. altered basalts, <1% by volume 1mm in diameter vesicles, microcrystalline, subangular blocks, occasional <1mm thick glassy rim, 30cm in size
3 :    IGSN URI900255  
Lithology and Mineralogy: igneous (extrusive/volcanic), basalt
Weathering / Metamorphism: weathering - light
Glass and remarks: notable Mn/Fe oxide coatings
Comments: Sample TN273-34D-01-03. Rift bottom. altered basalts, <1% by volume 1mm in diameter vesicles, microcrystalline, subangular blocks, occasional <1mm thick glassy rim, 34cm in size
4 :    IGSN URI900256  
Lithology and Mineralogy: igneous (extrusive/volcanic), basalt
Weathering / Metamorphism: weathering - light
Glass and remarks: notable Mn/Fe oxide coatings
Comments: Sample TN273-34D-01-04. Rift bottom. altered basalts, <1% by volume 1mm in diameter vesicles, microcrystalline, subangular blocks, occasional <1mm thick glassy rim, 20cm in size
5 :    IGSN URI900257  
Lithology and Mineralogy: sedimentary (pyroclastic), tuff, vitric (glass clasts)
Comments: Sample TN273-34D-01-05. Altered basalts, <1% by volume 1mm in diameter vesicles, microcrystalline, subangular blocks, occasional <1mm thick glassy rim, 16cm in size
6 :    IGSN URI900258  
Lithology and Mineralogy: igneous (extrusive/volcanic), basalt
Weathering / Metamorphism: weathering - light
Glass and remarks: some samples with fresh glass & Mn/Fe oxide coatings
Comments: Sample TN273-34D-01-06. Rift bottom. altered basalts, <1% by volume 1mm in diameter vesicles, microcrystalline, subangular blocks, occasional <1mm thick glassy rim, 15cm in size
7 :    IGSN URI900259  
Lithology and Mineralogy: igneous (extrusive/volcanic), basalt
Weathering / Metamorphism: weathering - light
Glass and remarks: notable Mn/Fe oxide coatings
Comments: Sample TN273-34D-02-01. Rift bottom. manganese coated sediment with worm holes that go through entire sediment rock, holes are also coated with manganese
8 :    IGSN URI900260  
Lithology and Mineralogy: igneous (extrusive/volcanic), basalt
Weathering / Metamorphism: weathering - light
Glass and remarks: some samples with fresh glass & Mn/Fe oxide coatings
Comments: Sample TN273-34D-03-01. Rift bottom. black, coarse gained sediment, 98% by volume 1-2mm in diameter rock fragments, 2% by volume 5cm in diameter altered basalt fragments
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