Radiolaria – Siliceous plankton through time

Baumgartner, Peter O.

doi:10.1007/s00015-006-0611-4

Cited by 10 publications

(13 citation statements)

References 16 publications

(12 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…condensed units and the A.R./siliceous series heteropy) could be related to paleoceanographical conditions. As formulated by Baumgartner (1987) for other Tethyan 436 M. Boughdiri et al basins in different palaeogeographical settings, it is possible that bottom currents may have caused high surface fertility in the Tunisian Trough basin and winnowed light radiolarian tests from swells by resuspension and transport into the adjacent current-protected basin.…”

Section: The Onset Of Siliceous Deposition In Northwest Tunisiamentioning

confidence: 99%

“…Our point of view favours the interpretation of a return to higher rates of carbonate sedimentation due to a marked change in the palaeocirculation regime (Cecca et al 2001, Savary et al 2003. In fact, by the end of the Jurassic, the tectonically-related change in Mediterranean Tethys position exposes this realm to weak surface circulation controlled by subtropical gyres rather than to prevailing equatorial current systems (Hsü 1976, Weissert 1979, Baumgartner 1987, Savary et al 2003.…”

Section: The Onset Of Siliceous Deposition In Northwest Tunisiamentioning

confidence: 99%

See 1 more Smart Citation

Jurassic radiolarian-bearing series of Tunisia: biostratigraphy and significance to western Tethys correlations

Boughdiri¹,

Cordey

Sallouhi³

et al. 2007

Swiss j geosci

View full text Add to dashboard Cite

International audienceSince the 1970s, radiolarians have been used extensively to study and characterize basin successions from the peri-Mediterranean regions. However, no data was ever produced in Tunisia in spite of the occurrence of Jurassic siliceous series previously described by many authors. Our study presents the biostratigraphical results obtained on sections from the Jédidi Formation, which characterizes the basinal series of the Tunisian Trough. We provide new direct age determinations from the base, the middle part and the top of the formation, which ranges from the latest Bajocian–middle Bathonian to the Oxfordian (Tethyan biozones UAZ 5-6 to 8-9). The onset of these radiolarianbearing series of the Tunisian Trough, adjacent to partly coeval Ammonitico Rosso successions, is interpreted as resulting from regional palaeotopographical gradient and palaeoceanographical conditions. Inaccurately interpreted as “true” radiolarites, theses series are different from coeval radiolarites of the Maghrebian “Dorsale calcaire” and from more recent homologous deposits of the Flysch domain. They are instead correlative with series exposed in the Babors and the west-Numidian ranges of northern Algeria that belonged to the same Jurassic North African margin of western Tethys. During Alpine convergence s.l., this external domain was overthrust by nappe complexes of the Maghrebide inner zones and the Flysch domain units

show abstract

Section: The Onset Of Siliceous Deposition In Northwest Tunisiamentioning

confidence: 99%

Section: The Onset Of Siliceous Deposition In Northwest Tunisiamentioning

confidence: 99%

Jurassic radiolarian-bearing series of Tunisia: biostratigraphy and significance to western Tethys correlations

Boughdiri¹,

Cordey

Sallouhi³

et al. 2007

Swiss j geosci

View full text Add to dashboard Cite

show abstract

“…The radiolarians of this family are rare but are extremely abundant in the Jurassic sedimentary rocks of the Northern Hemisphere: western part of the Atlantic Ocean [12], west Tibet [14], Coast Ranges of California and western Oregon in the United States [15], Bering Sea region in Russia [2], and deep-sea radiolarian siliceous sequences of Japan [15].…”

Section: Geologymentioning

confidence: 99%

“…In addition to rare poorly preserved radiolarian skeletons (15-16 specimens), only single curved foraminifera tubes have been found after dissolution. ure), which form a so-called hexagon [12]. This morphologically expressed group of Jurassic (Late Bajocian-Early Tithonian) spumellarians was found for the first time by P. Baumgartner [12, p. 780, Table 7, Figs.…”

mentioning

confidence: 95%

“…This morphologically expressed group of Jurassic (Late Bajocian-Early Tithonian) spumellarians was found for the first time by P. Baumgartner [12, p. 780, Table 7, Figs. [11][12][13][14] and was conditionally ascribed to the genus Praeconocaryomma Pessagno. Later, studying a sample of Upper Jurassic (Kimmeridgian-Lower Tithonian) radiolarian chert from Tibet, Yang and Wang [14] attributed this group to the family Leugeonidae Yang et Wang and identified two new genera: Leugeo Yang et Wang with a spherically-cuboidal outer shell reinforced by six spicules and Levileugeo Yang et Wang with a spherical shell and secondary spicules or without them.…”

mentioning

confidence: 99%

See 1 more Smart Citation

The first finding of reliable Jurassic radiolarians in the Crimea

2017

View full text Add to dashboard Cite

Radiolarians of Leugeonidae Yang et Wang, 1990, which represent a morphologically distinctive group of spherical radiolarians of the Spumellaria order, were found for the first time in Crimea and reliably confirm the Jurassic age of the finding. The nodules, which host the Jurassic radiolarians, were collected by A.S. Alekseev in 1983 in the terrigenous sequence of the Lozovskaya tectonic zone. The radiolarian assemblage in the nodules includes Levileugeo ordinarius Yang et Wang, Triactoma jonesi Pessagno, Pseudocrucella aff. prava Blome, Paronella kotura Baumgartner, P. ex gr. mulleri Pessagno, and Praeconocaryomma sp. The Levileugeo genus is easily identified due to its unique hexagonal element, which is typical only of the Jurassic, in particular, Upper Bajocian-Lower Tithonian radiolarians.

show abstract

Monsoon as a cause of radiolarite in the Tethyan realm

Wever

O’Dogherty

Goričan³

2014

Comptes Rendus. Géoscience

View full text Add to dashboard Cite

The radiolaritic facies (red/green cherts with radiolarians) is a very characteristic feature of the Tethyan realm. For a long time, its presence has been interpreted as a consequence of depth of an oceanic environment. It is now preferable to consider it as high productivity sediment. We here underline the interpretation inferring the role of monsoons for such productivity according to the relative position of lands at that time.

show abstract

Radiolaria – Siliceous plankton through time

Cited by 10 publications

References 16 publications

Jurassic radiolarian-bearing series of Tunisia: biostratigraphy and significance to western Tethys correlations

Jurassic radiolarian-bearing series of Tunisia: biostratigraphy and significance to western Tethys correlations

The first finding of reliable Jurassic radiolarians in the Crimea

Monsoon as a cause of radiolarite in the Tethyan realm

Contact Info

Product

Resources

About