Some New Tertiary Radiolaria from Antarctic Deep-Sea Sediments

Chen, Pei-Hsin

doi:10.2307/1485135

Cited by 18 publications

(26 citation statements)

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“…Botryostrobus Bj0rklund, 1976;Dzinoridze et al, 1978;Petrushevskaya, 1975Petrushevskaya, , 1979Petrushevskaya and Kozlova, 1972;Benson, 1972;Lazarus and Pallant, 1989;Chen, 1975;Abelmann, 1990;Caulet, 1991;Takemura, 1992;Campbell, 1942, 1945;Westberg-Smith and Riedel, 1984;Kozlova and Gorbovets, 1966;J.-P. Caulet, R. Goll, andA. Sanfilippo, pers.…”

Section: Artostrobus Quadriporus Bj0rklundmentioning

confidence: 99%

Paleoceanography and Biostratigraphy of Paleogene Radiolarians from the Norwegian-Greenland Sea

Hull¹

1996

Proceedings of the Ocean Drilling Program

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Eocene and Oligocene radiolarians were recovered from two sites on Ocean Drilling Program (ODP) Leg 151. Early Oligocene to early late Oligocene radiolarians have been extracted from material cored at Site 908 on the Hovgàrd Ridge (Fram Strait). Although rare and only moderately preserved, these assemblages represent the northernmost occurrence of radiolarians recovered by either the Deep Sea Drilling Project or ODP thus far. Site 913 on the East Greenland margin has yielded a sequence of moderately diverse middle Eocene to earliest Oligocene radiolarians. In total, -75 species have been documented herein from both sites.Previous radiolarian biostratigraphies developed for the Norwegian-Greenland Sea were used as an initial basis for Leg 151 age dating. However, complications introduced by Leg 38 spot-coring techniques and radiolarian endemism are highlighted by Site 913 material that does not fit easily into either of the previous biostratigraphic zonations proposed for this region. Consequently, age determinations are based in part on comparison of Site 913 with Leg 38 sites as well as calibration of radiolarian events with other microfossil groups (diatoms, silicoflagellates, and dinoflagellates) present in Hole 913B. The combined stratigraphies suggest the presence of the Eocene/Oligocene boundary in the uppermost part of the biosiliceous sequence at Site 913. The uppermost part of this interval is characterized by the dominance of robust radiolarian groups, broken radiolarian tests, rare diatoms and increased reworking of radiolarians and dinoflagellates. These changes are interpreted as evidence for increased bottomwater circulation associated with radiolarian blooms at or just above the Eocene/Oligocene boundary. These findings concur with previous studies indicating increased bottomwater circulation in the North Atlantic during this same period of geologic time.

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Section: Artostrobus Quadriporus Bj0rklundmentioning

confidence: 99%

Paleoceanography and Biostratigraphy of Paleogene Radiolarians from the Norwegian-Greenland Sea

Hull¹

1996

Proceedings of the Ocean Drilling Program

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“…3-4. Synonym. Druppatractus sp., Chen, 1975a, 1975b. Genus STYLACONTARIUM Popofsky, 1912Stylacontarium bispiculum Popofsky, 1912 fig.…”

Section: Siphonosphaera Magnisphaeralmentioning

confidence: 99%

“…Comments. Some authors have provided separate stratigraphic data for A. strelkovi and A. longa (Popofsky) Petrushevskaya, 1967(Petrushevskaya, 1975, whereas others have not (Chen, 1975a(Chen, , 1975bWeaver, 1976bWeaver, , 1983. In this study no distinction was made between these forms.…”

Section: Siphonosphaera Magnisphaeralmentioning

confidence: 99%

“…Initial studies based on piston cores and Deep Sea Drilling Project rotary drilled sections (Chen, 1974(Chen, , 1975a(Chen, , 1975bHays, 1965;Hays and Opdyke, 1967;Keany and Kennett, 1972;Lombari and Lazarus, 1988;Petrushevskaya, 1967Petrushevskaya, , 1975Weaver, 1976aWeaver, , 1976b provided descriptions of some of the more common species and established a preliminary stratigraphic framework for Neogene sections. The Pliocene-Pleistocene stratigraphy was calibrated to geologic time using paleomagnetic stratigraphy (Hays and Opdyke, 1967), but the Miocene stratigraphy was not calibrated because of incomplete sections, endemic forms, and a lack of good paleomagnetic data.…”

Section: Introductionmentioning

confidence: 99%

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Antarctic Neogene Radiolarians from the Kerguelen Plateau, Legs 119 and 120

Lazarus¹

1992

Proceedings of the Ocean Drilling Program

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Abundant, generally well-preserved radiolarians from Sites 737, 744, 745, 746, 747, 748, and 751 were used in stratigraphic analysis of Neogene, and particularly middle Miocene to Holocene, Kerguelen Plateau sediments. The composite Kerguelen section is more complete than the Weddell Sea sections recovered by Leg 113, and the radiolarians are better preserved. Leg 113 radiolarian zonations of Weddell Sea sites were applicable with only slight modification, and three new zones-Siphonosphaera Vesuvius, Acrosphaeral labrata, and Amphymenium challengerae-are proposed for the latest Miocene. Geologic age estimates are given for all radiolarian zones used. Major hiatuses affecting most sites were seen within the middle Miocene, in the latest Miocene, and latest Pliocene. Five new species are described: Acrosphaeral labrata, Acrosphaeral mercurius, Siphonosphaera Vesuvius, Actinommal magnifenestra, and Helotholusl haysi.

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“…[5] described Antarctic radiolarian species from the Super family Liosphaericae. [6][7][8][9][10][11][12][13][14][15][16][17] established Neogene radiolarian biostratigraphy along with illustrations and descriptions of important taxa. [18][19][20][21][22] carried out the detailed study on Antarctic Neogene radiolarian biostratigraphy.…”

Section: Introductionmentioning

confidence: 99%

Pleistocene Radiolaria from Leg 119 Site 738B (Sections 1H1-1H2): Systematics and Biostratigraphy

Sharma¹,

Kanojia²

2013

OJG

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This paper presents a record of radiolarian species from the sections (1H1-1H2) Leg 119 Site 738B of Southern Ocean region. Well diversified taxa of typical Antarctic assemblage are present in the sections. Thirty species were identified and illustrated from twenty-nine samples. On the basis of appearance, disappearance and abundance of taxa, viz. Omega and Psi zones are established and systematics of stratigraphically important species is described. These zones are equivalent to NR1 and NR2 of Upper Quaternary.

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Some New Tertiary Radiolaria from Antarctic Deep-Sea Sediments

Cited by 18 publications

References 1 publication

Paleoceanography and Biostratigraphy of Paleogene Radiolarians from the Norwegian-Greenland Sea

Paleoceanography and Biostratigraphy of Paleogene Radiolarians from the Norwegian-Greenland Sea

Antarctic Neogene Radiolarians from the Kerguelen Plateau, Legs 119 and 120

Pleistocene Radiolaria from Leg 119 Site 738B (Sections 1H1-1H2): Systematics and Biostratigraphy

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