Faunal and solution patterns of planktonic Foraminifera in surface sediments of the South Pacific

Parker, Frances L.; Berger, Wolfgang

doi:10.1016/0011-7471(71)90017-9

Cited by 137 publications

(136 citation statements)

References 15 publications

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“…This morphotype is also found into the Pleistocene at Site 847 in the eastern equatorial Pacific (Chaisson, 1996). The stratigraphic integrity of pulleniatinid morphotypes seems to decline in regions that are ecologically suboptimal for this genus, with the western equatorial Pacific being the optimal region for this genus (Parker and Berger, 1971). …”

Section: Pulleniatinamentioning

confidence: 98%

Planktonic foraminifer biostratigraphy at Site 925: middle Miocene–Pleistocene

Chaisson¹,

Pearson²

1997

Proceedings of the Ocean Drilling Program

105

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Ocean Drilling Program Site 925 is situated on Ceara Rise in the western tropical Atlantic at 4û12 ′ N, 43û30 ′ W and in 3041 m water depth. The section contains well-preserved planktonic microfossils through the late Miocene, with only moderate dissolution of carbonate in the middle Miocene. No unconformities are apparent.Datums used to establish the biozonation, and to further reÞne the age model, were constrained shipboard to within 1.5 m. In general, one sample per core has been re-examined to identify all species present. Globorotalia menardii, Globorotalia tumida, Globorotalia truncatulinoides, Pulleniatina obliquiloculata, and Neogloboquadrina dutertrei vary considerably in abundance, and each is occasionally absent in the Pleistocene, which suggests signiÞcant oceanographic change through this interval. The published ages assigned to planktonic foraminifer datums are compared to those suggested by the astrochronologic time scale. Several signiÞcant discrepancies (>0.25 m.y.) are found. Some are due to taxonomic problems (e.g., Þrst occurrence [FO] of Pulleniatina Þnalis, FO and last occurrence [LO] of Hirsutella cibaoensis, LO Neogloboquadrina acostaensis ), but many may identify real diachrons (e.g., LO Hirsutella margaritae and FO Truncorotalia crassaformis ). Discrepancies that involve zonal boundary markers (FO Globoturborotalita nepenthes and LO Fohsella fohsi ) should be further studied, as revisions to the Neogene zonation may be in order.Global rates of planktonic foraminiferal taxonomic evolution are compared to values measured at Site 925. SigniÞcant discrepancies are found, which suggests that the closing of the Central American Seaway decoupled patterns of evolution in the tropical Atlantic and PaciÞc.An assessment of planktonic foraminiferal dissolution at all Þve sites in the Ceara Rise depth transect reveals three apparent ÒtransgressionsÓ of corrosive bottom water to shallower depths on the rise between 10 and 12 Ma, at 7 Ma, and at 1 Ma.

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Section: Pulleniatinamentioning

confidence: 98%

Planktonic foraminifer biostratigraphy at Site 925: middle Miocene–Pleistocene

Chaisson¹,

Pearson²

1997

Proceedings of the Ocean Drilling Program

105

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“…The modern planktonic foraminifer lysocline (Parker and Berger, 1971) lies at about 2000 meters in the area of the Japan Trench (based on the preservation of planktonic species in all samples examined from the core-top data). The carbonate-compensation depth (CCD) lies at about 3500 meters.…”

Section: Foraminifer Bathymetrymentioning

confidence: 99%

Foraminifers from Deep Sea Drilling Project Sites 434, 435, and 436, Japan Trench

Thompson¹

1980

Initial Reports of the Deep Sea Drilling Project

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Sediments containing foraminifers were penetrated at all three sites drilled during DSDP Leg 56 as the first part of a Japan Trench transect. Two sites were on the inner wall of the trench (Site 435, 3401 m; Site 434, 5986 m), and one was on the oceanic plate east of the trench (Site 436, 5240 m). Because the lysocline in this area is at about 2000 meters and the calcite-compensation depth is at about 3500 meters, calcareous foraminifers are generally not abundant in the sediments; however, the biostratigraphy based upon planktonic foraminifer faunas agrees with that based predominantly upon siliceous microfossils from the sites. Hole 435A yielded the oldest of the planktonic foraminifers from the three sites.Two plankonic foraminifer lineages were particularly important in determining the biostratigraphy of the sites. The Neogloboquadrina asanoi-kagaensis-himiensis-eggeri lineage underwent rapid evolution around the Pliocene-Pleistocene boundary and is widely recognized in the oil-producing region of northern Japan and in the northwest Pacific. Second, the Globorotalia orientalis-inflata praeinflata-inflata inflata lineage evolved during the Pliocene; tests of these species are very resistant to dissolution. During the Pleistocene, individuals of Neogloboquadrina pachyderma preferentially coiled sinistrally in the cold waters north of the subarctic boundary and dextrally in temperate waters south of it. The ratio of these two forms was used to identify relative motions of near-surface waters of the Kuroshio and Oyashio Currents in the transect area in response to Quaternary climatic fluctuations.Benthic foraminifers characteristic of modern surface sediments were used to interpret uplift and plate motions of the Japan Trench as recorded at Leg 56 sites. Materials from the DSDP sites and from piston cores taken elsewhere in the region permitted extension of the foraminifer bathymetry of Matoba (1977) to the bottom of the Japan Trench; the lower bathyal, abyssal, and hadal biofacies are recognized. The sediments of the oceanic plate have a benthic foraminifer fauna distincly different from that of the inner trench wall at comparable depths. There is no evidence from these contrasting faunas to indicate that sediments of the oceanic plate are added to the landward trench wall during subduction.Manganese micronodules recovered from pelagic clay at Site 436 contained external models of Paleogene(?) juvenile planktonic foraminifers. That the tests of these foraminifers did not dissolve before the manganese was deposited is significant to theories of manganesenodule formation.Two new foraminifer species, Globorotalia wilesi and Silicosigmoilina splendida, are named.

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“…Our results suggest that the faunal variation between nearby sites from water depths at or below the lysocline (Parker and Berger, 1971) is equal to the faunal variatior between adjacent samples from within a core. Faunal variation resulting from varying degrees of preferential preservation may resemble the results due to climatic fluctuations and criteria are needed which will allow the recognition·of foraminiferal changes responsive .-to these two factors.…”

mentioning

confidence: 61%

TIME-DEPENDENT VARIATIONS IN SURFACE OCEANIC CURRENTS. Final Technical Report.

Douglas¹

1971

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Faunal and solution patterns of planktonic Foraminifera in surface sediments of the South Pacific

Cited by 137 publications

References 15 publications

Planktonic foraminifer biostratigraphy at Site 925: middle Miocene–Pleistocene

Planktonic foraminifer biostratigraphy at Site 925: middle Miocene–Pleistocene

Foraminifers from Deep Sea Drilling Project Sites 434, 435, and 436, Japan Trench

TIME-DEPENDENT VARIATIONS IN SURFACE OCEANIC CURRENTS. Final Technical Report.

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