Tentative Calibration of Site 398 and Special Processing of Parts of Lines GP-19 and GP-23

Bouguigny, R.; Willm, C.

doi:10.2973/dsdp.proc.47-2.132.1979

Cited by 1 publication

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“…Two examples illustrate the reinterpretation required. At DSDP Site 398, about 90 km southeast of Site 638, the seismic profiles have generally been interpreted (Bouguigny and Willm, 1979;Groupe Galice, 1979; as showing that the reflector identified as "acoustic basement" is the base of the syn-rift sequence, which from the drilling results at Site 398 would be somewhere in the Hauterivian. As pointed out by Si buet and Ryan (1979), strata beneath this "acoustic basement" are clearly sedimentary near Site 398 and, on the basis of drill ing results at Site 638, we think also include important thick nesses of pre-Hauterivian syn-rift sediments.…”

Section: Regional Implications Of the Cretaceous Syn-rift Strata At Smentioning

confidence: 99%

Site 638

1987

Proceedings of the Ocean Drilling Program

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Time on hole: 18 hr Position: 42°09.2'N, 12°11.8'W Water depth (sea level, corrected m, echo-sounding): 4661 Water depth (rig floor, corrected m, echo-sounding): 4671 Bottom felt (m, drill pipe): 4673 Penetration (m): 44 Number of cores: None Total length of cored section (m): 0 Total core recovered (m): 0 Core recovery (%): 0 1 Time on hole: 6 days, 21 hr Position: 42°09.2'N, 12°11.8'W (100 m east of Hole 638A) Water depth (sea level, corrected m, echo-sounding): 4661 Water depth (rig floor, corrected m, echo-sounding): 4671 Bottom felt (m, drill pipe): 4673 Penetration (m): 431.1 Number of cores: 45 Total length of cored section (m): 431.1 Total core recovered (m): 210.5 Core recovery (%): 49 Deepest sedimentary unit cored: Depth sub-bottom (m): 431.1 Nature: sandstone and claystone Age: late Valanginian Measured vertical sound velocity (km/s): 4.0 and 2.2, respectively HOLE 638C Time on hole: 12 days, 16 hr Position: 42°09.2'N, 12°11.8'W (100 m east and 30 m south of Hole 63 8 A) Water depth (sea level, corrected m, echo-sounding): 4661 Water depth (rig floor, corrected m, echo-sounding): 4671 Bottom felt (m, drill pipe): 4673 Penetration (m): 547.2 Number of cores: 14 Total length of cored section (m): 135.3 Total core recovered (m): 37.7 Core recovery (%): 28 Deepest sedimentary unit cored: Depth sub-bottom (m): 547.2 Nature: sandstone and claystone Age: Valanginian Measured vertical sound velocity (km/s): 4.4 and 2.5, respectively Principal results: Three holes were drilled at Site 638: Hole 638A as an engineering test hole, Hole 638B as a pilot hole to prepare for reen try operations, and Hole 638C as a multiple reentry hole. The stratigraphic column, combining data from Holes 638B and 638C, to a depth of 547.2 meters below seafloor (mbsf), shown graphi cally in Figure 1, consists of the following intervals: 1. 0-183.6 m: upper Miocene to Pleistocene nannofossil ooze and chalk, occurring as a submarine valley fill. 2. 183.6-212.6 m: upper Barremian bioturbated micrite and coup lets of laminated claystone and marlstone. SITE 638 it; I''.,, iaSKS i .,.!.. ;.:.) V v.\',i,

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Section: Regional Implications Of the Cretaceous Syn-rift Strata At Smentioning

confidence: 99%

Site 638

1987

Proceedings of the Ocean Drilling Program

View full text Add to dashboard Cite

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Tentative Calibration of Site 398 and Special Processing of Parts of Lines GP-19 and GP-23

Cited by 1 publication

References 3 publications

Site 638

Site 638

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