A Lower Cretaceous nannofossil zonation for the North Sea Basin

Jeremiah, Jason

doi:10.1144/jm.20.1.45

Cited by 45 publications

(55 citation statements)

References 35 publications

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“…The transition is marked by an interval enriched in holococcoliths (Fig. 3b), detected also in other North Sea sites 17,23 . Holococcoliths are produced during the motile life stage of coccolithophore algae, but the factors inducing the secretion of holococcoliths are not well established.…”

Section: Discussionsupporting

confidence: 56%

“…The biostratigraphy of both cores is based on a nannofossil scheme (LK zones) 17 , according to which the sections cover the early Barremian-early Aptian LK19 to LK12 zones (Figs 1a,b and 2). Both sections overlap in correspondence of LK18 zone.…”

Section: Resultsmentioning

confidence: 99%

“…The data set presented expands the information available for the Barremian of the North Sea area 17,18,22,23 . The nannoconids show fluctuations similar and coeval with those observed in the Tethys, Atlantic and Pacific 3,4,6,10 , including the 'nannoconid decline' and the 'nannoconid crisis' events 4,6,9 .…”

Section: Discussionmentioning

confidence: 99%

“…Relative abundance of single taxa are expressed as single taxon percentage and are calculated from total nannofossil abundances. Identification of taxa is based on taxonomic guidelines 17,34,35 . The diversity of the nannoflora has been determined using the parameter of species richness and heterogeneity (Shannon Index 21 ), calculated using the software MVSP 3.1.…”

Section: Article Nature Communications | Doimentioning

confidence: 99%

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Early Cretaceous chalks from the North Sea giving evidence for global change

Mutterlose

Bottini

2013

Nat Commun

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Among calcareous nannofossils, important primary producers in Jurassic and Cretaceous oceans, nannoconids were carbonate rock-forming organisms. During the late Barremian and early Aptian (B126 to 122 million years ago), nannoconids went through a crisis culminating during the Oceanic Anoxic Event 1a. Here we present nannofossil and geochemical data from a section of early Barremian-early Aptian age from the North Sea, recording the earliest chalks ever known in the Boreal Realm. These middle-late Barremian chalks were generated by blooming of endemic nannoconids under relative warm and arid conditions. A subsequent decrease of nannoconids in the latest Barremian coincides with increased nutrient and clay input. This nannoconid decline, also detected at low latitudes, was associated with the Ontong Java Plateau emplacement. We conclude that nannoconids were rock forming also at high latitudes, under clear and oligotrophic waters. Their decline was related to increased continental runoff under reinforced greenhouse conditions.

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Section: Discussionsupporting

confidence: 56%

Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Article Nature Communications | Doimentioning

confidence: 99%

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Early Cretaceous chalks from the North Sea giving evidence for global change

Mutterlose

Bottini

2013

Nat Commun

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“…and species dominance within this group may indicate the trophic level of an oceanic environ- (Melinte & Mutterlose, 2001) C. salebrosum max.48% in lower Valanginian and Hauterivian (Mutterlose & Kessels, 2000) C. salebrosum peaks up to 8% in lower upper Valanginian and 16% in lower Hauterivian C. salebrosum peaks up to 1% in lower upper Valanginian and 2% in lower Hauterivian C. salebrosum peaks up to 14% in upper lower Valanginian and 30% in lower Hauterivian (Jeremiah, 2001) Fig. 11.…”

Section: Resultsmentioning

confidence: 99%

Early Cretaceous (Valanginian ‐ Hauterivian) calcareous nannofossils and isotopes of the northern hemisphere: proxies for the understanding of Cretaceous climate

Kessels

Mutterlose

Michalzik

2006

LET

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Hauterivian) calcareous nannofossils and isotopes of the northern hemisphere: proxies for the understanding of Cretaceous climate. Lethaia , Vol. 39, pp. 157 Á172. Oslo. ISSN 0024-1164. From three boreholes (DSDP Site 535; ODP Site 638; BGS borehole 81/43) of the Central Atlantic and the North Sea Basin 379 samples of early Cretaceous age (Valanginian Á Hauterivian) were examined. The localities cover a S ÁN transect of approximately 3000 km stretching from 178N to 408N palaeolatitude. The distribution of calcareous nannofossils and fluctuations of the stable isotopes (d 13 C, d 18 O) have been recorded and were compared with results of recent studies. We differentiate between high nutrient indicators and oligotrophic taxa and propose a four step scheme to characterize the trophic level of the surface water. (1) High abundances of the fertility group (Biscutum constans/Zeugrhabdotus spp.) combined with a high dominance of B. constans and low abundances of Watznaueria barnesae/W. fossacincta represent a high nutrient environment (eutrophic setting).(2) High abundances of the fertility group combined with a high dominance of Zeugrhabdotus spp. and low abundances of W. barnesae/W. fossacincta reflect enhanced nutrient contents of the surface water (mesotrophic setting).(3) Enhanced abundances of the fertility group combined with high abundances of W. barnesae/W. fossacincta indicate slightly increased nutrient contents of the surface water (meso-to oligotrophic setting). (4) Low abundances of the fertility group and high abundances of W. barnesae/W. fossacincta are of low nutrient affinities (oligotrophic setting). Our estimations of seawater palaeotemperatures in combination with literature data show a distinctive trend for the Valanginian to Hauterivian interval. A general decrease of water temperature from the Valanginian to the early Hauterivian is obvious. This decrease of temperature coincides with the southward migration of the high latitudinal cold water species Crucibiscutum salebrosum to lower latitudes. Our findings shed new light on the evolution of the earliest Cretaceous climate, which may be characterized as a warm greenhouse world with interludes of short cooling.

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