Cenozoic Planktonic Foraminifers of the Falkland Plateau and Argentine Basin, Deep Sea Drilling Project Leg 71

Krasheninnikov, V.A.; Basov, Ivan A

doi:10.2973/dsdp.proc.71.130.1983

Cited by 18 publications

(14 citation statements)

References 20 publications

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“…Comparison of the occurrence and composition of Paleogene planktonic foraminiferal assemblages from the southernmost latitudes and from the lower latitude paleobiogeographic and paleoceanographic reconstructions in the Atlantic Ocean (e.g., Haq et al, 1977;Kennett, 1978;Boersma and Premoli Silva, 1983;Krasheninnikov and Basov, 1986;Boersma et al, 1987;Barker, Kennett, et al, 1988;Boersma and Premoli Silva, 1989) enhances our knowledge of the climatic evolution of Atlantic water masses during the Paleogene.…”

Section: Discussionmentioning

confidence: 99%

“…pseudotopilensis and A. bullbrooki, Globorotaloides suteri, Chiloguembelina cubensis, Subbotina angiporoides, S. utilisindex (= S. linaperta in Krasheninnikov and Basov, 1983), Pseudohastigerina micra, and Globigerinatheka index higher in the sequence. The well-preserved specimens illustrated by Krasheninnikov and Basov (1983) as Globigerina boweri and Globigerina frontosa are common in our material, but are considered to belong to the genus Subbotina, based on their wall structure. A single specimen of Hantkenina was also found at Site 512, confirming that this taxon is mainly absent at high latitudes, independent of dissolution.…”

Section: Correlation With the Othermentioning

confidence: 94%

“…A comparison between the Paleogene planktonic foraminiferal record from Leg 114 and those from previous Legs 36 , 71 (Krasheninnikov and Basov, 1983), and 40 (Toumarkine, 1978) allows us to describe spatially and temporally the evolution of the South Atlantic latitudinal belt between 51°S (western side) and 45°S (eastern side) during the Paleogene.…”

Section: Correlation With the Othermentioning

confidence: 99%

“…Subbotina inaequispira (Subbotina, 1953) (= Globigerina inaequispira Subbotina). See Krasheninnikov and Basov (1983), pi. 2, figs.…”

Section: Species List and Taxonomic Notesunclassified

“…Through the remainder of the Paleogene, paleoclimatic and paleoceanographic conditions reflect a progressively cooler climate. Oceanwide cooling event(s) resulted in biotic changes that, in turn, produced an accumulation of different types of sediments (from calcareous to siliceous) (Keigwin and Corliss, 1986;Krasheninnikov and Basov, 1986;Boersma et al, 1987).…”

Section: Introductionmentioning

confidence: 99%

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Planktonic Foraminiferal Biostratigraphy and Paleoenvironmental Interpretation of Paleogene Faunas from the Subantarctic Transect, Leg 114

Nocchi¹,

Amici²,

Silva³

1991

Proceedings of the Ocean Drilling Program

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Paleogene planktonic foraminifers recovered during ODP Leg 114 in the subantarctic region exhibit a cosmopolitan character at the opening of the Paleocene, and then they evolve similarly to faunas from lower latitudes. They begin to differentiate from lower latitude faunas by the early late Paleocene when large morozovellids disappear from the region and cool deep-water-dwelling Globorotaloides appear much earlier than at lower latitudes. By early Eocene time large morozovellids immigrate into the subantarctic area during the warmest episode of the entire Eocene. From that time up to the end of the middle Eocene planktonic foraminiferal faunas exhibit a temperate character, as indicated by the abundance of common acarininids. At the same time dissolution at depth causes depauperated planktonic faunas at the deeper sites. A new warming episode during the late Eocene is marked by the immigration of Globigerinatheka luterbacheri into the subantarctic region. The cooling trend during the late Eocene causes a progressive decrease in species richness, which only sporadically is less than 10 species. The early Oligocene is also characterized by relatively rich planktonic faunas, but after that time the western subantarctic region is occasionally invaded by few planktonic foraminiferal species. These immigrations coincide with the warmer episodes on the climatic curve, such as Zones P21a and P22-"N4."Beginning in late early Eocene and through the Oligocene eastern subantarctic planktonic foraminiferal faunas exhibit a much warmer character than those from the western side and are more similar to warm temperate faunas. Therefore, the eastern faunas provide a more refined biostratigraphy. Oligocene time is characterized by a trend toward a warmer climate; however, this trend was reversed in the early Miocene.A dissolution event, possibly coeval with an erosional event, occurs within Zone P21b across the subantarctic region.

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