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| Klein, Geraldine; Kobayashi, K. |
| Leg 58 drilled three sites (442, 443, 444) in the Shikoku Basin and two (445, 446) in the Daito Ridge and Basin province (BRBP). At the Shikoku Basin sites, drilling penetrated hemipelagic clays and underlying tholeitic pillow basalts and sills. Basalt sills intruded both sediments and pillow lavas. The K-Ar age on pillow basalt is at variance with one magnetic anomaly interpretation, but in agreement with another. Rifting of the Shikoku Basin was either symmetrical or asymmetrical; off-ridge volcanism in the basin has made basement age resolution ambiguous. Rocks at the DRBP sites (445, 446) consist of an upper pelagic interval and a lower section of volcaniclastic turbidites and debris flow sandstones and conglomerates (intruded by 26 sills at 446).... |
| Tipo: Text |
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| Ano: 1981 |
URL: http://archimer.ifremer.fr/doc/00246/35693/34201.pdf |
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