Diversity of radiolarian families through time

Wever, Patrick De; O’Dogherty, Luis; Caridroit, Martial; Dumitrică, Paulian; Guex, Jean; Nigrini, Catherine A; Caulet, J.

doi:10.2113/174.5.453

Cited by 57 publications

(54 citation statements)

References 51 publications

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“…Whereas microfacies analysis of limestones is a common tool to describe their depositional setting (Flügel 2004), microfacies analyses of radiolarites remain rare, but, besides the overall lithofacies and the sedimentation rate (Jenkyns & Winterer 1982;De Wever et al 2001; Baum gartner 2013), they provide a powerful tool for the reconstruction of the depositional realm of radiolaritic sequences (Gawlick & Missoni 2015;Gawlick et al 2016 a). In certain cases the micro facies of the radiolarites is typical of an age range.…”

Section: Lithology and Microfaciesmentioning

confidence: 99%

Age and microfacies of oceanic Upper Triassic radiolarite components from the Middle Jurassic ophiolitic mélange in the Zlatibor Mountains (Inner Dinarides, Serbia) and their provenance

Gawlick¹,

Djerić²,

Missoni³

et al. 2017

Geologica Carpathica

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Oceanic radiolarite components from the Middle Jurassic ophiolitic mélange between Trnava and Rožanstvo in the Zlatibor Mountains (Dinaridic Ophiolite Belt) west of the Drina-Ivanjica unit yield Late Triassic radiolarian ages. The microfacies characteristics of the radiolarites show pure ribbon radiolarites without crinoids or thin-shelled bivalves. Beside their age and the preservation of the radiolarians this points to a deposition of the radiolarites on top of the oceanic crust of the Neo-Tethys, which started to open in the Late Anisian. South of the study area the ophiolitic mélange (Gostilje-Ljubiš-Visoka-Radoševo mélange) contains a mixture of blocks of 1) oceanic crust, 2) Middle and Upper Triassic ribbon radiolarites, and 3) open marine limestones from the continental slope. On the basis of this composition we can conclude that the Upper Triassic radiolarite clasts derive either from 1) the younger parts of the sedimentary succession above the oceanic crust near the continental slope or, more convincingly 2) the sedimentary cover of ophiolites in a higher nappe position, because Upper Triassic ribbon radiolarites are only expected in more distal oceanic areas. The ophiolitic mélange in the study area overlies different carbonate blocks of an underlying carbonate-clastic mélange (Sirogojno mélange). We date and describe three localities with different Upper Triassic radiolarite clasts in a mélange, which occurs A) on top of Upper Triassic fore-reef to reefal limestones (Dachstein reef), B) between an Upper Triassic reefal limestone block and a Lower Carnian reef limestone (Wetterstein reef), and C) in fissures of an Upper Triassic lagoonal to back-reef limestone (Dachstein lagoon). The sedimentary features point to a sedimentary and not to a tectonic emplacement of the ophiolitic mélange (= sedimentary mélange) filling the rough topography of the topmost carbonate-clastic mélange below. The block spectrum of the underlying and slightly older carbonate-clastic mélange points to a deposition of the sedimentary ophiolitic mélange east of or on top of the Drina-Ivanjica unit.

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Section: Lithology and Microfaciesmentioning

confidence: 99%

Age and microfacies of oceanic Upper Triassic radiolarite components from the Middle Jurassic ophiolitic mélange in the Zlatibor Mountains (Inner Dinarides, Serbia) and their provenance

Gawlick¹,

Djerić²,

Missoni³

et al. 2017

Geologica Carpathica

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“…2). Although a relatively minor component of the oceans' plankton, in some settings their siliceous tests make up a significant proportion of oceanic sediments (Petrushevskaya 1971;Kennett 1982;Casey 1993;Boltovskoy 1994;De Wever et al 2001). Quantitative studies of radiolarian and planktic foraminiferal assemblages in sea-floor sediments and marine sediment cores have been the most widely used paleontological approaches to ocean history reconstruction for the last 40 years (e.g., Hays 1965).…”

Section: Radiolaria In the Oceans And Surface Sedimentsmentioning

confidence: 99%

“…Radiolarians have two advantages over planktic foraminifera in such studies. They are vastly more diverse, making them very suitable for population-based paleoceanographic studies, and they are more resistant to dissolution in nutrient-rich, coastal, and high-latitude settings (Moore 1978;De Wever et al 2001). Unlike calcium carbonate, silica is not undersaturated at depth.…”

Section: Radiolaria In the Oceans And Surface Sedimentsmentioning

confidence: 99%

Sedimentary record of radiolarian biogeography, offshore eastern New Zealand

Hollis¹,

Neil

2005

New Zealand Journal of Marine and Freshwater Research

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Examination of 38 surface sediment samples from offshore eastern New Zealand, between 33°S and 54°S, yielded 100 radiolarian taxa, which are common to abundant in sediments deposited at > 1000 m water depth but rare at shallower depths. In general, radiolarians are most abundant, most diverse, and best preserved in assemblages north of the Subtropical Front (STF). Multivariate analysis of census data for 29 radiolarian-rich samples identifies six sample groups and eight species groups. The STF forms a major biogeographic barrier, separating three transitional zone (TR) and three subantarctic zone (SA) sample groups. The three primary sample groups (TR1, TR2, SA1) record a southward latitudinal trend of decreasing abundance of subtropical-tropical or warm-water taxa (species group 4) and increasing abundance of subantarcticAntarctic or cool-water taxa (species groups 7 and 8). Two secondary sample groups (TR3 and SA2) may record the influence of shallow-water processes or strong surface currents on either side of the STF. low abundance and diversity, records relatively shallow, stratified, and silica-limited conditions of the central Campbell Plateau.

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“…The superfamily Pylonioidea Haeckel, 1882, are a group of radiolarians with skeletons characterized by fenestrate forms or systems of ribbonlike latticed tests (De Wever et al, 2001). Because of the diversity of this clade in the southern Bay of Bengal, northeastern Indian Ocean, pylonioids could play an important role in oceanographic and paleoceanographic studies.…”

Section: Introductionmentioning

confidence: 99%