Radiolarian faunal turnover through the Paleocene-eocene transition, Mead Stream, New Zealand

Hollis, Christopher J.

doi:10.1007/978-3-7643-8344-2_7

Cited by 23 publications

(28 citation statements)

References 20 publications

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“…Although experimental evidence on physiological response is lacking, the secretion of radiolarian siliceous shells should be easier under slightly reduced pH than in more alkaline water. The apparent lack of a significant response of radiolarians to the acidification event at the Paleoence/Eocene boundary (Hollis 2006) supports this contention.…”

Section: Causes Of the End-triassic Mass Extinctionsupporting

confidence: 71%

Trajectories of Late Permian – Jurassic radiolarian extinction rates: no evidence for an end-Triassic mass extinction

Kiessling

Danelian²

2011

Foss. Rec.

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The hypothesis that ocean acidification was a proximate trigger of the marine end-Triassic mass extinction rests on the assumption that taxa that strongly invest in the secretion of calcium-carbonate skeletons were significantly more affected by the crisis than other taxa. An argument against this hypothesis is the great extinction toll of radiolarians that has been reported from work on local sections. Radiolarians have siliceous tests and thus should be less affected by ocean acidification. We compiled taxonomically vetted occurrences of late Permian and Mesozoic radiolarians and analyzed extinction dynamics of radiolarian genera. Although extinction rates were high at the end of the Triassic, there is no evidence for a mass extinction in radiolarians but rather significantly higher background extinction in the Triassic than in the Jurassic. Although the causes for this decline in background extinction levels remain unclear, the lack of a major evolutionary response to the end-Triassic event, gives support for the hypothesis that ocean acidification was involved in the dramatic extinctions of many calcifying taxa. <br><br> doi:<a href="http://dx.doi.org/10.1002/mmng.201000017" target="_blank">10.1002/mmng.201000017</a>

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Section: Causes Of the End-triassic Mass Extinctionsupporting

confidence: 71%

Trajectories of Late Permian – Jurassic radiolarian extinction rates: no evidence for an end-Triassic mass extinction

Kiessling

Danelian²

2011

Foss. Rec.

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“…The dinocyst assemblages, but also other microfossil groups, in midlatitudes have been successfully used for detailed environmental reconstructions (e.g., Gibbs et al, 2006;Hollis, 2007;Sluijs and Brinkhuis, 2009;Stassen et al, 2012). Here, we find extremely low numbers of dinocysts (100-200 g −1 , relative to latest Paleocene average of > 5000 g −1 ), carbonate and siliceous microfossils during the body of the CIE.…”

Section: Dinocyst Decline During Peak Petmmentioning

confidence: 60%

Tropical Atlantic climate and ecosystem regime shifts during the Paleocene–Eocene Thermal Maximum

et al. 2018

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Abstract. The Paleocene-Eocene Thermal Maximum (PETM, 56 Ma) was a phase of rapid global warming associated with massive carbon input into the ocean-atmosphere system from a 13 C-depleted reservoir. Many midlatitude and high-latitude sections have been studied and document changes in salinity, hydrology and sedimentation, deoxygenation, biotic overturning, and migrations, but detailed records from tropical regions are lacking. Here, we study the PETM at Ocean Drilling Program (ODP) Site 959 in the equatorial Atlantic using a range of organic and inorganic proxies and couple these with dinoflagellate cyst (dinocyst) assemblage analysis. The PETM at Site 959 was previously found to be marked by a ∼ 3.8 ‰ negative carbon isotope excursion (CIE) and a ∼ 4 • C surface ocean warming from the uppermost Paleocene to peak PETM, of which ∼ 1 • C occurs before the onset of the CIE. We record upper Paleocene dinocyst assemblages that are similar to PETM assemblages as found in extratropical regions, confirming poleward migrations of ecosystems during the PETM. The early stages of the PETM are marked by a typical acme of the tropical genus Apectodinium, which reaches abundances of up to 95 %. Subsequently, dinocyst abundances diminish greatly, as do carbonate and pyritized silicate microfossils. The combined paleoenvironmental information from Site 959 and a close-by shelf site in Nigeria implies the general absence of eukaryotic surface-dwelling microplankton during peak PETM warmth in the eastern equatorial Atlantic, most likely caused by heat stress. We hypothesize, based on a literature survey, that heat stress might have reduced calcification in more tropical regions, potentially contributing to reduced deep sea carbonate accumulation rates, and, by buffering acidification, also to biological carbonate compensation of the injected carbon during the PETM. Crucially, abundant organic benthic foraminiferal linings imply sustained export production, likely driven by prokaryotes. In sharp contrast, the recovery of the CIE yields rapid ( 10 kyr) fluctuations in the abundance of several dinocyst groups, suggesting extreme ecosystem and environmental variability.

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“…Stratigraphic ranges of key radiolarians from Nagaland and Manipur samples calibrated to the Geological Time Scale of Ogg et al (). Age assignments follow Cenozoic, low‐latitude radiolarian zonations of Hollis () and Jackett et al () and Middle Jurassic to Middle Cretaceous radiolarian zonations of Baumgartner et al (), modified by O'Dogherty et al (, ). UAZ = unitary association zone.…”

Section: Biostratigraphymentioning

confidence: 97%

Tectonic Evolution of the Western Margin of the Burma Microplate Based on New Fossil and Radiometric Age Constraints

Aitchison

Bhowmik

et al. 2019

Tectonics

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Results of biostratigraphic and geochronological investigations in eastern Nagaland and Manipur, NE India, provide new constraints on the tectonic evolution of the western margin of the Burma microplate. U/Pb zircon ages indicate that the Naga Hills ophiolite developed in a suprasubduction zone setting as part of an intraoceanic island arc developed during late Early Cretaceous (mid‐Aptian) time and is younger than similar rocks exposed along the Indus‐Yarlung Tsangpo suture zone. Radiolarian microfossils provide Jurassic and Cretaceous age constraints for Tethyan ocean floor sediments that were subducted beneath the forming ophiolite. Timing of the emplacement of these rocks onto the passive margin of eastern India is constrained by Paleocene/Eocene radiolarians in sediments over which the ophiolitic assemblage has been thrust. Previously undated schists and gneisses in the Naga Metamorphics are of Early Ordovician age, and their sedimentary protolith was most likely derived from sources in the south of Western Australian and East Antarctica. After Barrovian‐style metamorphism, these rocks were uplifted and eroded becoming an important source of detritus shed into the Eocene Phokphur Formation. This unit also contains abundant clasts sourced from the disrupted basement of the Naga Hills ophiolite, which it overlies. It also contains Permo‐Triassic‐aged detritus eroded off an enigmatic source that was possibly a continental convergent margin arc system somewhere along the northern margin of Gondwana.

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Radiolarian faunal turnover through the Paleocene-eocene transition, Mead Stream, New Zealand

Cited by 23 publications

References 20 publications

Trajectories of Late Permian – Jurassic radiolarian extinction rates: no evidence for an end-Triassic mass extinction

Trajectories of Late Permian – Jurassic radiolarian extinction rates: no evidence for an end-Triassic mass extinction

Tropical Atlantic climate and ecosystem regime shifts during the Paleocene–Eocene Thermal Maximum

Tectonic Evolution of the Western Margin of the Burma Microplate Based on New Fossil and Radiometric Age Constraints

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Radiolarian faunal turnover through the Paleocene-eocene transition, Mead Stream, New Zealand

Cited by 23 publications

References 20 publications

Trajectories of Late Permian &ndash; Jurassic radiolarian extinction rates: no evidence for an end-Triassic mass extinction

Trajectories of Late Permian &ndash; Jurassic radiolarian extinction rates: no evidence for an end-Triassic mass extinction

Tropical Atlantic climate and ecosystem regime shifts during the Paleocene–Eocene Thermal Maximum

Tectonic Evolution of the Western Margin of the Burma Microplate Based on New Fossil and Radiometric Age Constraints

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Trajectories of Late Permian – Jurassic radiolarian extinction rates: no evidence for an end-Triassic mass extinction

Trajectories of Late Permian – Jurassic radiolarian extinction rates: no evidence for an end-Triassic mass extinction