World Data Service for Geophysics

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


Repository: SOEST [Contact the Curator]
Ship: Kana Keoki
Cruise: KK820316
Sample: KK820316 STA60 RD35
Device: dredge, rock
Latitude: -9.01067
Longitude: 157.97733
Water Depth(m): 410 to 380
Date: 19820604
Storage: room temperature, dry

Just S.W. of Kavachi Sation. Eight buckets of samples-each individually labeled. Four buckets labeled 1, two buckets labeled 3, two buckets labeled 4.
1 :   
Comments: 500-600 kg of cobble to boulder-size rocks. > 80% of the rocks were very fresh with angular broken surfaces. Some of the samples had coatings of sulfur and/or sulfides; these were associated with samples that showed some degree of hydrothermal alteration or oxidation. In some cases the mineralization extended into vesicles within the rocks, but more typically was confined to surfaces and fractures. The contents of the dredge were similar to the previous dredge (RD 34) on Kavachi but may be more diversified. The primary rock types (> 70%) are ol-pyroxene phyric basalts, ol-plag phyric basalts, and ol-pyrox-plag basalts. The predominance of cpx-rich volcanics is noted; some with cm-size euhedral crystals. Most of the rocks are vesicular (5-20% vesicles) but some (<5%) are pumacious. A small number (<5%) of basaltic agglomerates are also present. Most (> 80%) of the rocks are fresh. ~5 bags of undescribed rocks to Solomons, 1 bag of described samples. ~4 bags of undescribed rocks to HIG, 1 (2?) of described samples. Note: Kavachi went about 300 m to NE at nearest- discoloured intermittent slick.