World Data Service for Geophysics

Index to Marine and Lacustrine Geological Samples (IMLGS)
an international partnership

doi:10.7289/V5H41PB8


Repository: SOEST [Contact the Curator]
Ship: Melville
Cruise: BMRG06MV
Sample: BMRG06MV STA21 RD43
Device: dredge, rock
Latitude: -41.2515
Longitude: 79.1045
Water Depth(m): 2800 to 2770
Date: 19960306
PI: Kevin Johnson
Storage: room temperature, dry
Province: rise or ridge, aseismic ocean

Southeast Indian Ridge; Sampling locale: Axial valley, segment J4.
1 :   
Weathering/Metamorphism: weathering - fresh
Comments: Sample Type: Sheet flow basalt. Mineralogy: Plagioclase. Weathering: Fresh. Glass condition: >50% fresh glass. 3 buckets. All three samples were subsampled for DG and probe glass taken. Remainder of glass to KJ. Samples placed in bucket.Fresh glassy sheet flows with very minor amounts of plagioclase phenocrysts in the glass. Type 1 of this dredge.
2 :   
Comments: Sample Type: Sheet flow basalt. Mineralogy: Plagioclase. Weathering: Light to moderate. Glass condition: Minor glass. 3 buckets. 43-4 thru 43-6 all had probe glass taken and glass taken for KJ. KN also subsampled 43-4 and 43-5. Rock samples were placed in a bucket.Plag-phyric sheet flow basalts. These samples appear to be older than type 1 with significant evidence of hydrothermal alteration. Type 2 of this dredge.
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