Calcareous-Nannofossil Biostratigraphy of Japan Trench Transect, Deep Sea Drilling Project Leg 57

Shaffer, Bernard L.

doi:10.2973/dsdp.proc.5657.126.1980

Cited by 8 publications

(2 citation statements)

References 5 publications

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“…The nannofossils recovered during Leg 56 are described by Haq and Goreau (1980). Those recovered during Leg 57 are discussed by Schaffer (1980). Both of these initial studies report assemblages similar to those observed in samples from Site 584.…”

Section: Conclusion and Summary Of Observationsmentioning

confidence: 87%

Calcareous Nannofossils from the Nankai Trough and Japan Trench, Deep Sea Drilling Project Leg 87

Lang¹

1986

Initial Reports of the Deep Sea Drilling Project

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Drilling at three DSDP drill sites on the western margin of the Pacific Ocean off the coast of Japan yielded thick sequences of hemipelagic muds and clays generally depleted of calcareous nannofossils. Operations at Sites 582 and 583 recovered dominantly Quaternary sediments. The Pliocene/Pleistocene boundary was reached near the bottom of Hole 582B. At both sites, preserved coccolith populations contained generally few to common nannoliths. The effects of reworking were evident throughout most sections at these two sites. Drilling at Site 584 in the Japan Trench recovered Holocene to Miocene sediments. Populations of nannofossils from this site were generally more depleted than those from the two Nankai Trough sites. Reworking within these sections appears to be much less severe than in samples from the more southern sites.

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Section: Conclusion and Summary Of Observationsmentioning

confidence: 87%

Calcareous Nannofossils from the Nankai Trough and Japan Trench, Deep Sea Drilling Project Leg 87

Lang¹

1986

Initial Reports of the Deep Sea Drilling Project

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“…Above that interval, nannofossils are few in number, moderately preserved, and do not provide continuous reliable age assignments. Sediment below Section 584-1-6 is Pliocene, but sediment immediately above is barren of nannofossils; perhaps the hiatus inferred at Hole 438A (Shaffer, 1980) involves this interval.…”

Section: Hole 584mentioning

confidence: 98%

Site 584

1986

Initial Reports of the Deep Sea Drilling Project

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Time on bole: 85 hr., 30 min. Position (latitude; longitude): 40°28.0'N; 143°57.1'E Water depth (sea level; corrected m, echo-sounding): 4078 Water depth (rig floor; corrected m, echo-sounding): 4088 Bottom felt (rig floor; m, drill pipe): 4124 Penetration (m): 941.0 Number of cores: 98 Total length of cored section (m): 941.0 Total core recovered (m): 478.7 Core recovery (%): 51 Oldest sediment cored: Depth sub-bottom (m): 941.0 Nature: Mudstone Age: early middle Miocene Measured velocity (km/s): V p = 2.00 (at 932 m sub-bottom) Time on hole: 10 hr., 24 min. Position (latitude; longitude): 40 c 28.0'N; 143°57.6'E Water depth (sea level; corrected m, echo-sounding): 4094 Water depth (rig floor; corrected m, echo-sounding): 4104 Bottom felt (rig floor; m, drill pipe): 4125 Penetration (m): 901.5 Kagami, H., Karig, D. E., Coulbourn, W. T, et al., Init. Repts. DSDP, 87: Washington (U.S. Govt. Printing Office). Total length of cored section (m): 28.9 Total core recovered (m): 10.66 Core recovery (%): 37 Oldest sediment cored: Depth sub-bottom (m): Core H4 (804.8 to 901.5 m sub-bottom) Nature: Mudstone Age: early middle Miocene Measured velocity (km/s): V p = 1.86 (at 796 m sub-bottom) Time on hole: 13 hr., 42 min. Position (latitude; longitude): 40°28.0'N; 143°56.7'E Water depth (sea level; corrected m, echo-sounding): 4086 Water depth (rig floor; corrected m, echo-sounding): 4096 Bottom felt (rig floor; m, drill pipe): 4152 Penetration (m): 954 Number of cores: 3 Total length of cored section (m): 22 Total core recovered (m): 11.89 Core recovery (%): 54 Oldest sediment cored: Depth sub-bottom (m): 954 Nature: Paisley mudstone Age: early middle Miocene Principal results: See Summary and Conclusions section.

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(Table 3) Nannofossil occurrence at DSDP Hole 57-438

Shaffer¹

1980

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Calcareous-Nannofossil Biostratigraphy of Japan Trench Transect, Deep Sea Drilling Project Leg 57

Cited by 8 publications

References 5 publications

Calcareous Nannofossils from the Nankai Trough and Japan Trench, Deep Sea Drilling Project Leg 87

Calcareous Nannofossils from the Nankai Trough and Japan Trench, Deep Sea Drilling Project Leg 87

Site 584

(Table 3) Nannofossil occurrence at DSDP Hole 57-438

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