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: Kana Keoki
Cruise: KK840428-03
Sample: KK840428 STA37 RD08
Device: dredge, rock
Latitude: 30.8835
Longitude: 139.76383
Water Depth(m): 2000
Date: 19840623
IGSN: UHMHAP1QZ
Storage: room temperature, dry

Sumisu Rift
1 :   
Comments: Numbered bags plus one bag labelled Lab Samples, which contains the remains of the specimens sampled on board. Hand specimens of all sample types distributed to HIG (Fryer), LDGO (Langmuir) and GSJ (Nohara) on board. Most abundant rock is fresh, vesicular basalt containing 5-20% phenocrysts of plagioclase and olivine in propoertions 2:1 or greater. Minerals usually occur as intergrowths & olivines are slightly yellow. Abundances of phenocrysts and vesicle size are quite variable. There are two other petrographic types of basalt apparent in cut specimens. The first is very dark and aphyric; the second has small plagioclase laths (no obvious olivine). Two pieces of white pumice with altered portions and fresh centers were also recovered. Both became lab samples.
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