Magnetostratigraphically-calibrated dinoflagellate cyst bioevents for the uppermost Eocene to lowermost Miocene of the western North Atlantic (IODP Expedition 342, Paleogene Newfoundland sediment drifts)

Egger, Lisa M.; Śliwińska, Kasia K.; Peer, Tim E van; Liebrand, Diederik; Lippert, Peter C.; Friedrich, Oliver; Wilson, Paul A.; Norris, Richard D.; Pross, Jörg

doi:10.1016/j.revpalbo.2016.08.002

Cited by 28 publications

(22 citation statements)

References 51 publications

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“…A and the newly described species Lejeunecysta adeliensis, these taxa have been repeatedly encountered in sediments straddling the Eocene-Oligocene boundary sediments (e.g. Sluijs et al, 2003;Eldrett et al, 2004;Egger et al, 2016). We report these taxa in low abundance (Table 2) in our record, predominantly within the interval characterised by a high degree of reworking in the lowermost Oligocene.…”

Section: Identification Of Reworking Based On Principal Component Anamentioning

confidence: 56%

Stratigraphic calibration of Oligocene–Miocene organic-walled dinoflagellate cysts from offshore Wilkes Land, East Antarctica, and a zonation proposal

Bijl

Houben

Bruls

et al. 2018

J. Micropalaeontol.

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Abstract. There is growing interest in the scientific community in reconstructing the paleoceanography of the Southern Ocean during the Oligocene-Miocene because these time intervals experienced atmospheric CO 2 concentrations with relevance to our future. However, it has remained notoriously difficult to put the sedimentary archives used in these efforts into a temporal framework. This is at least partially due to the fact that the bioevents recorded in organic-walled dinoflagellate cysts (dinocysts), which often represent the only microfossil group preserved, have not yet been calibrated to the international timescale. Here we present dinocyst ranges from Oligocene-Miocene sediments drilled offshore the Wilkes Land continental margin, East Antarctica (Integrated Ocean Drilling Program (IODP) Hole U1356A). In addition, we apply statistical means to test a priori assumptions about whether the recorded taxa were deposited in situ or were reworked from older strata. Moreover, we describe two new dinocyst species, Selenopemphix brinkhuisii sp. nov. and Lejeunecysta adeliensis sp. nov., which are identified as important markers for regional stratigraphic analysis. Finally, we calibrate all identified dinocyst events to the international timescale using independent age control from calcareous nanoplankton and magnetostratigraphy from IODP Hole U1356A, and we propose a provisional dinoflagellate cyst zonation scheme for the Oligocene-Miocene of the Southern Ocean.

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Section: Identification Of Reworking Based On Principal Component Anamentioning

confidence: 56%

Stratigraphic calibration of Oligocene–Miocene organic-walled dinoflagellate cysts from offshore Wilkes Land, East Antarctica, and a zonation proposal

Bijl

Houben

Bruls

et al. 2018

J. Micropalaeontol.

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“…implies that its LO is over 130 m above the Eocene-Oligocene boundary (equivalent to the top Eocene seismic horizon; see above). In the stratotype area for the Eocene-Oligocene boundary (in the Massicore borehole), the thickness of the interval between the Eocene-Oligocene boundary horizon and the LO of A. diktyoplokum is ∼ 6.5 m (Van Mourik and , whereas in an expanded upper Eocene to lower Oligocene succession from the western North Atlantic, the thickness is ∼ 15 m (Egger et al, 2016). Furthermore, correlation with the Nini-1 well ( Fig.…”

Section: Resultsmentioning

confidence: 92%

“…The LOs of P. comatum, S. manumii and L. serrata occur in the same stratigraphic order as in the western North Atlantic, where the events were dated to 30.7, 31.6 and 33.3 Ma, respectively (cf. Egger et al, 2016). Despite the risk of caving, it is noted that the interval of S. manumii in 11/10-1 is relatively thin (∼ 60 m; the lowermost sample yielding S. manumii is at 670.60 m b.s.f.).…”

Section: Resultsmentioning

confidence: 96%

“…This is in agreement with the stratigraphic range of S. manumii given previously byŚliwińska and Heilmann-Clausen (2011). The narrow range of S. manumii in the North Atlantic region (Egger et al, 2016;Eldrett et al, 2004;Lund, 2002;Williams and Manum, 1999) makes the taxon an excellent mid-Rupelian marker. The top of persistent occurrence of G. semitecta occurs at 823.00 m b.s.f., indicating that the LO of this species is one sample higher than suggested byŚliwińska and Heilmann-Clausen (2011).…”

Section: Resultsmentioning

confidence: 99%

“…Recently, the age model has been improved with a strontium (Sr) isotope (measured on tests of calcareous foraminifera and mollusc fragments) and micropalaeontological analyses (Eidvin et al, 2013;Jarsve et al, 2015;Fig. 2).…”

Section: Previous Studiesmentioning

confidence: 99%

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Early Oligocene dinocysts as a tool for palaeoenvironment reconstruction and stratigraphical framework – a case study from a North Sea well

Śliwińska¹

2019

J. Micropalaeontol.

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Abstract. The lower Oligocene (Rupelian) successions are climate record archives of the early icehouse world in the Cenozoic. Even though the number of studies focussing on the generally cold Oligocene is increasing, little is known about climatic variations in the mid-latitudes to high latitudes of the Northern Hemisphere. One of the major obstacles is the lack of stratigraphically complete uppermost Eocene to Oligocene successions in these regions. This study focusses on dinoflagellate cysts (dinocysts) from a thick nearly complete Rupelian succession in the Syracuse Oils Norge A/S well 11/10-1 drilled in 1969 in the Norwegian part of the North Sea basin. The well provides a record of mid-latitude dinocyst assemblages, which yield key biostratigraphical and palaeoenvironmental information. All the analyses were undertaken on ditch cutting samples. The dinocyst assemblages confirm that the well penetrates about 600 m of Rupelian sediments and (as supported by correlation with the Nini-1 well) that the lowermost Rupelian (below the top or the last occurrence of Areosphaeridium diktyoplokum) is expanded. These assemblages also indicate the presence of two hiatuses: the first extends from the Lutetian to the Priabonian (equivalent to the D9nb–D12nb zones), and the second spans the Rupelian–Chattian boundary (equivalent to the D14nb subzone or the NSO-5 zone). Despite the risk of caving, the dinocyst assemblages support the existing sequence stratigraphic framework. The assemblages reflect a clear transition from distal to proximal deposition in the vicinity of the site (across the regional seismic sequences OSS-1 – OSS meaning Oligocene seismic sequence – to OSS-2). The proximal deltaic deposits of the OSS-2 regressive system tract (RST) are characterised by pulses of high sea-surface productivity and pronounced shifts in the dinocyst assemblages, reflecting a highly dynamic environment in a restricted marine to marginal marine setting. The Rupelian succession penetrated by well 11/10-1 yields one new species, Areoligera? barskii sp. nov., which is described here in detail. The cold-water-tolerant dinocyst Svalbardella cooksoniae is present in two intervals in the studied succession. These intervals are related to the early Oligocene cooling maxima (the Oi-1a and the Oi-2 events). Furthermore, these two intervals correlate with two local sequence boundaries, suggesting that they are most probably of glacioeustatic origin. From these observations, I postulate that the early icehouse climate played an important role in the depositional development of the Oligocene succession in the North Sea basin. Even though the Eocene–Oligocene transition interval is not complete (i.e. Lutetian to Priabonian is either missing or condensed), well 11/10-1 merits high-resolution studies of the early icehouse climate for the North Sea region. Although any detailed studies should ideally be undertaken on conventional cores instead of ditch cuttings, no such samples spanning the Eocene–Oligocene transition exist in this area.

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A new stratigraphic framework for the Miocene – Lower Pliocene deposits offshore Scandinavia: A multiscale approach

Dybkjær

Rasmussen

Eidvin³

et al. 2020

Geological Journal

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Here, we present an updated stratigraphic subdivision of the Oligocene to Pleistocene succession (880–610 m) in the newly proposed type well for the Molo Formation, the industrial 6407/9‐5 well, located on the continental shelf in the eastern Norwegian Sea. Furthermore, new data from the Danish North Sea wells Nora‐1, Vagn‐2, and Tove‐1 are presented. The studied succession in the 6407/9‐5 well is composed of five sedimentary units separated by hiati. The dating of these five units is based on correlation to the stratigraphically more complete Neogene succession in the (Danish) central North Sea area. In this study, a robust stratigraphic framework of these five units, based on a combination of dinoflagellate cysts (dinocyst) stratigraphy and seismic data, is established. The Oligocene succession is referred to the NSO zonation of Van Simaeys et al., Review of Palaeobotany and Palynology, 2005, 134, 105–128, while the Miocene–Pliocene succession is referred to the dinocyst zonation of Dybkjær and Piasecki, Review of Palaeobotany and Palynology, 2010, 161, 1–29. In well 6407/9‐5 the two lowermost units, located below the Molo Formation, comprise a Rupelian (Lower Oligocene) succession up to 803 m, and an Aquitanian/Burdigalian (Lower Miocene) succession from 803 to 787 m, respectively. Both of these units are referred to the Brygge Formation. The Molo Formation is separated from the underlying Brygge Formation by an unconformity. Furthermore, and in contrast to previous studies, our study shows that the Molo Formation (787–703 m) has an unconformity within it. The lower part of the formation (787–724 m) is dated to late Tortonian (Late Miocene), and referred to the Hystrichosphaeropsis obscura dinocyst Zone. The upper part (724–703 m) is dated to Zanclean (Early Pliocene), and referred to the Melitasphaeridium choanophorum dinocyst Zone. The uppermost unit studied (703–670 m) in the well is referred to the Gelasian (Lower Pleistocene) and is included in the Naust Formation. The regional correlation of this stratigraphy with the complete succession in the Danish North Sea reveals that the hiati found in the Miocene succession on the Norwegian Sea shelf are controlled by tectonism, while the internal depositional patterns of the Molo Formation were controlled by eustatic sea‐level changes.

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Magnetostratigraphically-calibrated dinoflagellate cyst bioevents for the uppermost Eocene to lowermost Miocene of the western North Atlantic (IODP Expedition 342, Paleogene Newfoundland sediment drifts)

Abstract: 28The Oligocene epoch represents a somewhat neglected chapter in paleoclimate and 29 paleoceanographic history, which is at least partially due to the scarcity of complete

Cited by 28 publications

References 51 publications

Stratigraphic calibration of Oligocene–Miocene organic-walled dinoflagellate cysts from offshore Wilkes Land, East Antarctica, and a zonation proposal

Stratigraphic calibration of Oligocene–Miocene organic-walled dinoflagellate cysts from offshore Wilkes Land, East Antarctica, and a zonation proposal

Early Oligocene dinocysts as a tool for palaeoenvironment reconstruction and stratigraphical framework – a case study from a North Sea well

A new stratigraphic framework for the Miocene – Lower Pliocene deposits offshore Scandinavia: A multiscale approach

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