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Index to Marine and Lacustrine Geological Samples (IMLGS)

Repository: University of Hawaii at Manoa
Contact the Curator
Ship: Melville
Cruise: BMRG06MV
Sample: BMRG06MV STA16 RD41
Device: dredge, rock
Latitude: -41.7715
Longitude: 79.7525
Water Depth(m): 2970 to 2710
Date: 19960305
PI: Kevin Johnson
IGSN: IEUHM00OD
Storage: room temperature, dry
Province: rise or ridge, aseismic ocean

Southeast Indian Ridge; Sampling locale: Axial valley near transform, segment J4.
1 :    IGSN IEUHM007S  
Lithology/Mineralogy: igneous (extrusive/volcanic), basalt
Comments: Sample Type: Pillow basalt. Mineralogy: Plagioclase. Weathering: Light to moderate. Glass condition: Some fresh glassProbe glass taken. 41-1 and 41-2 subsampled by DG. Whole rock of 41-4 subsampled by KN. Glass to KJ.Fragments of pillow basalts with glassy rims of variable thickness containing plagioclase phenocrysts and with some Mn oxide coatings. 41-3 has a double chilled margiin. Type 1 of this dredge.
2 :    IGSN IEUHM007T  
Lithology/Mineralogy: igneous (extrusive/volcanic), basalt
Comments: Sample Type: Pillow basalt. Mineralogy: Plagioclase. Weathering: moderate to heavy. Glass condition: Some old glass; notable Mn/Fe oxide coatingsWhole rock (41-5 & 41-6) subsampled by KN. Weathered glass from 41-5 to KJ and probe. Angular pillow basalt fragment containing a few percent plagioclase phenocrysts, dark brown staining of Fe/Mn oxides and alteration rind ~1 cm thick. Some old glass on 41-5. Type 2 of this dredge.
3 :    IGSN IEUHM007U  
Lithology/Mineralogy: igneous (extrusive/volcanic), basalt
Comments: Sample Type: Pillow basalt. Mineralogy: Plagioclase. Weathering: moderate to heavy. Glass condition: No glass; notable Mn/Fe oxide coatingsWhole rock (41-8) subsampled by KN. No glass available. Rock samples placed in buckets.Angular pillow basalt fragments containing several percent plagioclase phenocrysts, light brown staining of Fe/Mn oxides and ~0.5 cm alteration rind. Type 3 of this dredge, distinguishable from type 2 in its higher crystallinity and older appearance..
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When you refer to individual samples/data in the IMLGS, please cite each source repository whose data you use.

More Information and how to cite the IMLGS: doi:10.7289/V5H41PB8.


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