Late Eocene to Holocene Diatom Biostratigraphy of the Equatorial Pacific Ocean, Deep Sea Drilling Project Leg 85

Barron, John A.

doi:10.2973/dsdp.proc.85.108.1985

Cited by 91 publications

(134 citation statements)

References 14 publications

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“…All samples contained N. reinholdii as well as Pseudoeunotia doliolus, constraining them to the period between 0.65 and 1.8 Ma (Baldauf, 1984;Barron, 1985). These data agree with both nannofossil and planktonic foraminifer datums.…”

Section: Diatomssupporting

confidence: 79%

Carolina Slope Sites 1054 and 1055

Keigwin¹,

Rio²,

Acton³

1998

Proceedings of the Ocean Drilling Program

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Section: Diatomssupporting

confidence: 79%

Carolina Slope Sites 1054 and 1055

Keigwin¹,

Rio²,

Acton³

1998

Proceedings of the Ocean Drilling Program

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“…The F0 of C. sawamurae at Site 887 thus is slightly older that the Chron C5Dn correlation reported by Barron (1985) (as C. nicobarica) at equatorial Pacific Ocean DSDP Site 575, but this age is in accord with the correlations of Baldauf et al (1987) at DSDPSite 610 in the North Atlantic.…”

Section: Diatomssupporting

confidence: 74%

Site 887

1993

Proceedings of the Ocean Drilling Program

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he Gulf of Alaska began about 0945 hr (local time) on 9 September 1992-the first daylight survey of the cruise. The survey was routine, and a beacon was dropped for Site 887 at about 1130 hr. Hole 887A was spudded with a good mud-line core at 2200 hr that same evening. Hole 887 A penetrated 285 m with 84% recovery and bottomed, after penetrating about 15 m of basaltic pea gravel, at basement. The attempt to spud Hole 887B, beginning at about 0600 hr on 11 September, met with failure twice, apparently because the APC apparatus was inoperable, which necessitated a pipe trip for a new bit assembly. Hole 887B finally was spudded at 0200 hr on the morning of 12 September and consisted of five APC cores (41.4 m cored and 103.5% recovery) raised for high-resolution studies of sediment and pore-water chemistry. With the recovery of Core 145-887B-2H, Leg 145 passed the 4000-m total core recovery level and became part of the now five-member elite group of ODP/DSDP cruises that has exceeded 4 km in total recovery. Hole 887C was spudded at 0600 hr on 12 September and was continued using the APC-coring system down to 274 mbsf with 98.4% recovery, a testament to the efficacy of the new aggressive piston-coring techniques. At 1100 hr on 13 September, we began the round trip to change the bit and set a bottom-hole assembly (BHA) for rotary-coring in the basement of the seamount platform. Hole 887D penetrated to 373.1 mbsf, about 84 m into basalt, with a low recovery of 20% in the rock. The last core of Leg 145, 145-887D-13R, arrived on deck at 0210 hr on 15 September, when preparation for logging began. The first two logging runs with the Quad combo and the formation microscanner (FMS) tools went well, but at about 0000 hr on 16 September, the FMS tool became stuck in the drill pipe during retrieval. Normal procedures could not dislodge it, so the crimper and then the cable cutter were sent down the wire, the cable was cut, and we started out of the hole. The suspect section of pipe arrived on deck about 1230 hr, the FMS tool was extracted, and the JOIDES Resolution got under way for Victoria, Canada, at 1500 hr on the 16th of September, about half a day sooner than expected. We were carrying 4321.40 m of sediment and basalt recovered from the sites of the North Pacific Transect, about 1 km more recovery than anticipatedthanks to the hard work and efficiency of the SEDCO drilling crews and the ODP operations group.The 289 m of sediment recovered at Site 887 can be divided into three lithologic units. Lithologic Unit I (0-90 mbsf) is an upper Pliocene to Quaternary siliceous silty clay (Subunit IA, 0-45 mbsf) and clay (Subunit IB,. Dropstones are numerous, and ash layers are common in Unit I. Lithologic Unit II (90-270 mbsf) is a lower Miocene to upper Pliocene siliceous ooze with scattered carbonate. Lithologic Unit II can be divided into three subunits. Lithologic Subunit IIA (90-174 mbsf) is an essentially pure diatom ooze of late Pliocene-late Miocene age. Subunit HB (174-235/mbsf) is an upper Miocene to middle Miocene calc...

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“…Recientemente, López García (1993) y López García y Bustillo (1994) han realizado un amplio estudio litológico y bioestratigráfico de estos sedimentos y han definido en ellos tres episodios, cuya edad fue determinada por aplicación de la biozonación de diatomeas de Barron (1985), definida en el Pacífico ecuatorial, teniendo en cuenta la adaptación de ésta al Atlánti-co norte efectuada por Baldauf (1986).…”

Section: Contexto Geológico Y Paleoceanográficounclassified

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Bustillo¹,

García²

1995

Estud. geol.

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La composición química de elementos mayores es utilizada para analizar las características composicionales y sedimentológicas en 24 afloramientos de sedimentos miocenos con diatomeas de la Cuenca del Guadalquivir. En función de las biozonas de diatomeas, se consideran tres episodios de sedimentación diatomítica (Inferior, Medio y Superior) que reflejan un medio de sedimentación de alta productividad biogénica ocasionada por corrientes ascensionales costeras (<

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Late Eocene to Holocene Diatom Biostratigraphy of the Equatorial Pacific Ocean, Deep Sea Drilling Project Leg 85

Cited by 91 publications

References 14 publications

Carolina Slope Sites 1054 and 1055

Carolina Slope Sites 1054 and 1055

Site 887

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