Table T6. Summary of Site 1137 volcaniclastic components.
| Lithologic (basement) unit |
Core interval | Depth (mbsf) |
Thickness (m) |
Age | Lithologies
with volcanic components |
Volcanic components |
Authigenic
and secondary minerals |
|---|---|---|---|---|---|---|---|
| I | 1R-1, 0 cm, to 1R-CC, 10 cm | 0-9.50 | 9.50 | middle Pleistocene | Foraminifer-bearing diatom ooze | <2% silt- to sand-sized basaltic lithic fragments and glass shards, <2% felsic glass shards and pumice lapilli | Mafic glass has green smectite clay minerals (nontronite, saponite) forming rims |
| IV (5) | 33R-1, 122 cm, to 33R-4,121 cm | 286.72-291.00 | 4.28 | late Campanian or older | Volcaniclastic dark greenish gray siltstones and light gray sandstones | 65%-70% volcanic lithics (basalt, trachyte), 10%-15% feldspar (K-feldspar) | Green to gray iron-rich smectite clay minerals (nontronite, saponite) |
| IV (6) | 33R-4, 120 cm, to 37R-1, 0 cm | 291.01-322.80 | 31.80 | late Campanian or older | Gray volcanic conglomerate | Principal clast types: plagioclase-phyric basalt, feldspar-phyric flow-banded and massive trachyte | Green iron-rich smectite clay (nontronite, saponite), minor hematite/goethite in oxidized rims |
| IV (9) | 41R-1, 103 cm, to 44R-4, 49 cm | 344.03-360.67 | 16.60 | late Campanian or older | Green crystal-vitric tuff | 50% felsic glass shards, 40% sanidine, 1%-2% amphibole, quartz and plagioclase feldspar, <5% lithic rip-up clasts | Green nontronite, saponite and possibly celadonite, some kaolinite, minor hematite and goethite in oxidized zone |