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: KK820316
Sample: KK820316 STA57 RD33
Device: dredge, rock
Latitude: -8.73517
Longitude: 157.05633
Water Depth(m): 1550 to 1250
Date: 19820603
IGSN: UHMHAP1QN
Storage: room temperature, dry

Ridge S.W. of Rendova. Four buckets of samples available-each individually labeled 2,2,3, and 4.
1 :   
Comments: 300 kg - 3/4 of dredge was full: top 3/4 was full of cobble size pumice with tan to light grey color containing mineral phenocrysts, fragments and pumaceous rock fragments. The bottom 1/4 of the bag was filled with vitrophyric basalts which commonly had a pitchstone-like surface with concordal fractures. These basalts have variable percentages of vesicles and in some cases grade into lighter-colored pumaceous basalt. Typical pumice cobble: tan to lt-grey with 80-90% clear to tan glass in sheaths and strings, These strands are welded together to form denser rock sections most show preferred linear flow orientation and flow bonding. They contain pumice shards as well as mineral grains and clost (plagioclase, magnetite, cpx). Basalts are glassy to finely crystalline with plag, cpx, magnetite +- ol. Some of the volcanics may be basaltic andesites or andesite. Phenocryst contents vary from ~5% to ~35%, vesicle content 5%-70%. 2 bags pumice to Sol. Is., 1 bag of described samples SI. 2 bags pumice to HIG, 1 bag of described samples HIG.
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