Nannofossil Biostratigraphy of the Southwest Pacific, Deep Sea Drilling Project, Leg 30

Shafik, Samir

doi:10.2973/dsdp.proc.30.117.1975

Cited by 19 publications

(20 citation statements)

References 3 publications

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“…Calcareous nannofossils possibly extend the record into the late Campanian (Shafik, 1975). A similar record was found at Site 289; however, the Cretaceous/Tertiary boundary reported from Core 30-289-30 is missing part of both the uppermost Maastrichtian and basal Paleocene .…”

Section: Correlationmentioning

confidence: 66%

“…Core 30-289-131 consists of two sections of laminated limestone and interbedded chert overlain by an interval of reddish brown, zeolite-bearing tuff followed in turn by white limestone at the top of the core. Calcareous nannofossils from the white limestone yield a late Campanian to early Maastrichtian age (Shafik, 1975), whereas upper Aptian planktonic foraminifers were reported from the laminated limestone below the reddish brown tuff in Sample 30-289-131-1, 145-146 cm . The presence of Aptian sediments is confirmed by the recovery of both Ticinella bejaouaensis and Hedbergella trocoidea as whole specimens in Sample 30-289-131-3, 80-82 cm, which are assigned to the Ticinella bejaouaensis Zone of latest Aptian age.…”

Section: Correlationmentioning

confidence: 99%

“…The next major hiatus occurs within Core 30-288A-12 and includes much of the Santonian and Campanian . Finally, the uppermost Maastrichtian may be missing based on the calcareous nannofossils (Shafik, 1975), although the boundary falls in the uncored interval between Cores 30-288A-8 and -9.…”

Section: Hiatusesmentioning

confidence: 99%

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Cretaceous Planktonic Foraminifers and Depositional Environments from the Ontong Java Plateau with Emphasis on Sites 803 and 807

Sliter¹,

Leckie²

1993

Proceedings of the Ocean Drilling Program

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Cretaceous planktonic foraminifers from Ocean Drilling Program (ODP) Leg 130 consist of two age groups: one dominantly Aptian in age and the other dominantly Maastrichtian. The oldest dated sediments from Ontong Java Plateau occur at ODP Site 807 and are assigned to the early Aptian Globigerinelloides blowi Zone. The assemblage correlates closely with Aptian foraminifers from Deep Sea Drilling Project (DSDP) Site 289 and a younger Aptian assemblage from DSDP Site 288 where drilling ended before reaching basement. Planktonic foraminifers from ODP Site 803 suggest a late Aptian to early Albian age and are overlain by radiolarians of late Albian age. These ages are in conflict with a radiometric age of about 90 Ma for basement at the site. The dominantly Maastrichtian group occurs at Site 807 and consists of poorly preserved, mostly small-sized specimens that range in age from perhaps the latest Campanian to the Cretaceous/Tertiary boundary. Age assignments are made difficult by pervasive dissolution and resedimentation that extends into the Paleogene.Deposition of the Aptian limestone at Site 807 took place at lower bathyal depths beneath the foraminiferal lysocline but above the calcite compensation depth (CCD). Deposition then continued beneath the CCD until the late Campanian or Maastrichtian when carbonate sedimentation resumed. Within the Maastrichtian, deposition again took place at lower bathyal depths at or above the rapidly dropping CCD until the Cretaceous/Tertiary boundary when the CCD apparently rose. Small planktonic foraminifers accumulated in winnowed and redeposited fine-grained sediments whereas larger planktonic foraminifers were deposited largely in mass-flow deposits that increase in number upsection through the Maastrichtian. The increased pulses of larger planktonic foraminifers followed by the abrupt occurrence of laminated sediments, an abundance of small, globular planktonic foraminifers, and an increase in radiolarians in the latest Maastrichtian likely were the result of northward plate motion into more productive waters and different current systems. At Site 803, deposition beneath the CCD continued from the earliest sediments above the basalt until the Eocene. Carbonate sedimentation during the late Albian to early Santonian, however, is recorded atop the plateau at Site 288.The extensive hiatuses in the Cretaceous sequence from the Ontong Java Plateau correlate in part with times of widespread hiatuses in the Pacific Basin. Evidence of pervasive mechanical erosion during the Cenomanian to Santonian and the Campanian to Maastrichtian on the top of the plateau perhaps were caused by the longitudinal position of the plateau relative to western boundary currents and eddy effects above the plateau.

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Section: Correlationmentioning

confidence: 66%

Section: Correlationmentioning

confidence: 99%

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Cretaceous Planktonic Foraminifers and Depositional Environments from the Ontong Java Plateau with Emphasis on Sites 803 and 807

Sliter¹,

Leckie²

1993

Proceedings of the Ocean Drilling Program

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“…This unit is not part of the regular low-latitude zonation, because the Amaurolithus extinction typically precedes the first consistent D. asymmetricus populations; however, this unit has been identified previously as a Discoaster asymmetricus Zone by Gartner (1969) and Martini (1971). The sporadic occurrence of D. asymmetricus in the upper Miocene (Bukry, 1973a;Shafik, 1975) can cause problems with this subzone. The occurrence of this unit in tropical areas is questionable, because my slides from DSDP Hole 62.1, Core 10 (01°52.2'N), identified as D. asymmetricus Zone (Martini, 1971), show Ceratolithus rugosus Bukry and Bramlette and D. asymmetricus, but no Amaurolithus, which should signify the low-latitude Reticulofenestra pseudoumbilica Zone CNlla and b (compare Martini, 1971).…”

Section: Zonationmentioning

confidence: 99%

Pacific Coast Coccolith Stratigraphy between Point Conception and Cabo Corrientes, Deep Sea Drilling Project Leg 63

Bukry¹

1981

Initial Reports of the Deep Sea Drilling Project

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DSDP Leg 63 recovered Neogene coccoliths from south of Point Conception, California (Site 467), to north of Cabo Corrientes, Mexico (Site 473), as part of a traverse exploring the sedimentary record of the California Current along the Pacific Coast. A combination of temperate and tropical zonations were used to date Leg 63 coccolith assemblages because of intergradations of warm and cool species along the transect. Variations in the abundance and the presence and absence of Discoaster species are useful in recognizing warm-cool intergradations. New taxa described in this report include Discoaster okadai n. sp., D. sanmiguelensis n. sp., Helicosphaera californiana n. sp., H. crouchii n. sp., H. gertae n. sp., and H. vedderi n. sp.

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“…Detailed foraminiferal stratigraphy is not available for DSDP Sites 288 and 289; therefore, in correlating stratigraphies between these and subsequent sites, the nannofossil zonation used by Shafik (1975) was related to Martini's (1970Martini's ( , 1971 zones and the Berggren et al (1985aBerggren et al ( , 1985b time scales (Appendix A). Martini's zones were also used in the stratigraphy of Site 586.…”

Section: Chronostratigraphic Controlmentioning

confidence: 99%

Hiatus and Tephrochronology of the Ontong Java Plateau: Correlation with Regional Tectono-Volcanic Events

Kroenke¹,

Resig²,

Leckie³

1993

Proceedings of the Ocean Drilling Program

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Evidence of regional tectonism/volcanism in the southwestern Pacific is inferred from the presence of hiatuses and/or ash encountered in the sections drilled on the Ontong Java Plateau at Ocean Drilling Program Sites 803-807 and Deep Sea Drilling Project Sites 288 and 289/586. In general, hiatuses on the plateau do not correlate well with one another or with the deep-sea hiatuses reported by others. Correspondence between groups or clusters of ash horizons between sites on the plateau is better in the upper part of the stratigraphic section than in the lower part. Both hiatus and ash occurrences appear to correlate well with changes in plate motion of the Indo-Australian and Pacific plates, seafloor-spreading history, initiation and cessation of southwest Pacific subduction events, related periods of explosive arc volcanism, and proximal intraplate volcanism.

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Nannofossil Biostratigraphy of the Southwest Pacific, Deep Sea Drilling Project, Leg 30

Cited by 19 publications

References 3 publications

Cretaceous Planktonic Foraminifers and Depositional Environments from the Ontong Java Plateau with Emphasis on Sites 803 and 807

Cretaceous Planktonic Foraminifers and Depositional Environments from the Ontong Java Plateau with Emphasis on Sites 803 and 807

Pacific Coast Coccolith Stratigraphy between Point Conception and Cabo Corrientes, Deep Sea Drilling Project Leg 63

Hiatus and Tephrochronology of the Ontong Java Plateau: Correlation with Regional Tectono-Volcanic Events

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