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Academic literature on the topic 'Nannofossiles'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 May 2024

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Journal articles on the topic "Nannofossiles"

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Minoletti, Fabrice, Silvia Gardin, Elisabeth Nicot, Maurice Renard, and Silvia Spezzaferri. "Mise au point d'un protocole experimental de separation granulometrique d'assemblages de nannofossiles calcaires; applications paleoecologiques et geochimiques." Bulletin de la Société Géologique de France 172, no. 4 (July 1, 2001): 437–46. http://dx.doi.org/10.2113/172.4.437.

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Abstract Calcareous nannofossils play an important role in biostratigraphy and paleoecology, though their study is often complicated by their reduced size. The methodology presented herein allows to separate the nannofossil assemblage into granulometrically and taxonomically homogeneous fractions. This method permits :a) the concentration of rare taxa in order to simplify their morphometric study; b) the geochemical analysis (stable isotopes and trace elements) of these fractions. The latter is helpful in many cases, especially when the analysis of major or minor taxa constituent of the assemblage is greatly complicated by the reduced particles dimensions. In this way, it will be possible to bring light to the ecological parameters of these taxa, as calcification temperature and other ecological requirements (salinity, nutrient concentrations).

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Lambert, Bernard. "Analyse biostratigraphique des Nannofossiles calcaires de l'Autoroute A 10." Cretaceous Research 6, no. 1-2 (March 1985): 191–97. http://dx.doi.org/10.1016/0195-6671(85)90038-2.

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Al-Lhaebi, Safwan. "PALEOCLIMATIC INSIGHTS ON THE CENOMANIAN-TURONIAN OCEANIC ANOXIC EVENT (OAE2) FROM NORTHERN IRAQ BASED ON CALCAREOUS NANNOFOSSILS AND GEOCHEMICAL DATA." Iraqi Geological Journal 53, no. 2C (September 30, 2020): 68–86. http://dx.doi.org/10.46717/igj.53.2c.6rs-2020-09/06.

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Calcareous nannofossils, mineralogical and geochemical investigations are carried out on the Cenomanian-Turonian boundary of the Gulneri Formation in the Azmir, Dokan and Degala sections, northern Iraq. Regarding the calcareous nannofossil data CC11 and CC12 biozones were identified. A detailed investigation was carried out to identify calcareous nannofossils species. On the basis of their stratigraphic distribution, two biozones were proposed in this study; Quadrum gartneri Interval Biozone (CC11) part and Lucianrhabdus maleformis Interval Biozone (CC12) part. Correlation with other calcareous nannofossils biozones from regional schemes led to conclude that the age of the Gulneri Formation in the studied sections is the early Turonian. Mineralogical (X-ray diffraction XRD) and trace elements geochemistry (X-ray fluorescence XRF) data along with the dominance of calcareous nannofossil Watznauria that indicates warm and arid climatic condition prevailing in the Cenomanian-Turonian transition.

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Švábenická, Lilian, Xianghui Li, Lubomír Jansa, and Yushuai Wei. "Nannofossil biostratigraphy of the Lower Cretaceous Shadui Formation (Northern Tethyan Himalayas, Southern Tibet)." Geologica Carpathica 61, no. 5 (October 1, 2010): 383–91. http://dx.doi.org/10.2478/v10096-010-0023-2.

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Nannofossil biostratigraphy of the Lower Cretaceous Shadui Formation (Northern Tethyan Himalayas, Southern Tibet)Calcareous nannofossils of Aptian-Albian age were found in the basal part of the Shadui Formation, Northern Tethyan Himalayas, Southern Tibet. The predominantly shale strata are exposed near the northeastern tip of Yamdrock Tso Lake at the locality of Bangbu and they were previously considered to be of Late Cretaceous age. Occurrence of the nannofossil speciesPrediscosphaera columnataandCribrosphaerella ehrenbergiiindicates the Upper Aptian-Lower Albian Zone BC23. Nannofossil species of Late Albian, Cenomanian or younger Cretaceous age were not present in the studied part of the Shadui Formation. Nannofossils are badly preserved and hardly identifiable probably as a result of strong post mortem etching and dissolution during burial. The depositional setting of the Shadui Formation is interpreted as hemipelagic to pelagic. A horizon of dark shale in the lower part of the Shadui Formation may be stratigraphically correlated with ocean anoxic event OAE1b. The discovery of calcareous nannofossils at the Bangbu locality increases the stratigraphic precision in the correlation of Cretaceous strata between hemipelagic-pelagic facies and shelf depositional areas in the Tibetan Tethyan Himalayas.

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Xinrong, Cheng. "Calcareous Nannofossils in Surface Sediments of the Central and Northern Parts of the South China Sea." Journal of Micropalaeontology 11, no. 2 (December 1, 1992): 167–76. http://dx.doi.org/10.1144/jm.11.2.167.

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Abstract. Taxonomic composition and quantitative distribution of calcareous nannofossils in the nothern and central parts of the South China Sea were studied in 146 samples of surface sediments taken from estuary, continental shelf, continental slope and deep-water basin. This paper reports distribution patterns of nannofossils in the area, including nannofossil abundance, species, assemblages and specimen size. Abundance increases from shelf to slope, with a decrease from the lower part of the slope towards the abyssal plain. The assemblages are dominated by Emiliania huxleyi, Gephyrocapsa oceanica and Florisphaera profunda. Ecologically the effects of water temperature, and nutrient inputs can be detected in the distribution of nannofossils, while dilution by terrigenous materials and deep sea carbonate dissolution influence the sedimentological aspect of the samples. The composition of the South China Sea nannofossil assemblage enables it to be grouped with the central zone of the North Pacific in biogeographic zonations of nannoplankton.

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Svobodová, Andrea, and Martin Kośák. "Calcareous nannofossils of the Jurassic/Cretaceous boundary strata in the Puerto Escano section (southern Spain) — biostratigraphy and palaeoecology." Geologica Carpathica 67, no. 3 (June 1, 2016): 223–38. http://dx.doi.org/10.1515/geoca-2016-0015.

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Abstract We obtained material from the Puerto Escano section (southern Spain) to study the Jurassic/Cretaceous (J/K) boundary interval. The same samples had already been processed for magnetostratigraphic studies and biostratigraphic zonation based on calpionellids and ammonites (Pruner et al. 2010), but not for calcareous nannofossils. The aim of this study was to process the samples using micropalaeontological analysis and to compare and calibrate results for calcareous nannofossils with existing magnetostratigraphic and other biostratigraphic data. The calcareous nannofossil assemblage was dominated by the genera Watznaueria, Cyclagelosphaera, Nannoconus, Conusphaera and Polycostella. Several nannofossil bioevents were recorded on the basis of the distribution of stratigraphically important taxa, including zonal and subzonal markers. Based on the lowest occurrences (LO) of M. chiastius, N. globulus minor, N. wintereri, N steinmanii minor, N. steinmannii steinmannii, N. kamptneri minor and N. kampteri kamptneri, two nannofossil subzones (NJT 15b, NJT 17a) and two nannofossil zones (NJT 16, NK-1) were recognized. The paper introduces new palaeoecological data based on geochemical analysis and macrofauna occurrences.

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Janin, Marie-Christine. "Biostratigraphie de concretions polymetalliques de l'archipel des Touamotou, fondee sur les Nannofossiles calcaires." Bulletin de la Société Géologique de France I, no. 1 (January 1, 1985): 79–87. http://dx.doi.org/10.2113/gssgfbull.i.1.79.

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Manivit, Hélène. "Distribution des Nannofossiles calcaires du Jurassique moyen et supérieur en Arabie saoudite centrale." Geobios 20 (January 1987): 277–91. http://dx.doi.org/10.1016/s0016-6995(87)80075-x.

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Janin, Marie-Christine. "Remarques sur l'ultrastructure et les affinités biologiques des Lithraphidites, nannofossiles calcaires du crétacé." Revue de Micropaléontologie 41, no. 4 (December 1998): 281–96. http://dx.doi.org/10.1016/s0035-1598(98)90197-0.

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Oszczypko-Clowes, Marta. "Reworked nannofossils from the Lower Miocene deposits in the Magura Nappe (Outer Western Carpathians, Poland)." Geologica Carpathica 63, no. 5 (November 13, 2012): 407–24. http://dx.doi.org/10.2478/v10096-012-0032-4.

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Abstract Studies, based on calcareous nannofossils, proved that the level of reworked microfossils had so far been underestimated. More recently detailed quantitative studies of calcareous nannoplankton of the Magura, Malcov, Zawada and Kremna formations from the Magura Nappe in Poland documented a degree of nannofossil recycling among those formations. In the Late Eocene-Early Oligocene pelagic Leluchów Marl Member of the Malcov Formation the level of redeposition is very low (0-3.80 %), however, in the flysch deposits of the Malcov Formation reworking increased to 31.4 %. Late Oligocene through Early Miocene “molasse” type deposits of the Zawada and Kremna formations contain 43.7-69.0 % of reworked nannofossils. Quantitative analyses of the reworked assemblages confirmed the domination of Paleogene nannofossil species over Cretaceous ones. The most abundant, reworked assemblages belong to the Early- Middle Eocene age.

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Dissertations / Theses on the topic "Nannofossiles"

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Bonnemaison, Monique. "Indices de diagenèse liés aux nannofossiles calcaires dans le Crétacé des Pyrénées : comparaison avec des sites océaniques dans le golfe de Gascogne /." 45-Orléans : Ed. du BRGM, 1989. http://catalogue.bnf.fr/ark:/12148/cb35034177h.

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Sanchez, Rios Maria Antonieta Guadalupe. "Foraminifères planctoniques et nannoplancton calcaire de quelques sites du Crétacé supérieur mexicain et sud-pyrénéen /." Toulouse : Université Paul Sabatier, Laboratoire de géologie sédimentaire et paléontologie, 1989. http://catalogue.bnf.fr/ark:/12148/cb35712901s.

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Barbarin, Nicolas. "La reconnaissance automatisée des nannofossiles calcaires du Cénozoïque." Thesis, Aix-Marseille, 2014. http://www.theses.fr/2014AIXM4318.

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SYRACO est un SYstème de Reconnaissance Automatisée des COccolithes, développé à son origine par Luc Beaufort et Denis Dollfus à partir de 1995 et plus récemment avec Yves Gally. L'utilité d'un tel système est de permettre aux spécialistes un gain de temps majeur dans l'acquisition et le traitement des données. Dans ce travail, le système a été amélioré techniquement et sa reconnaissance a été étendue aux nannofossiles calcaires du Cénozoïque. Ce système fait le tri entre les nannofossiles et les non-nannofossiles avec une efficacité respectivement estimée à 75% et 90 %. Il s'appuie sur une nouvelle base d'images de référence d'espèces datant de l'Eocène Supérieur aux espèces vivantes, ce qui représente des centaines d'espèces avec une forte variabilité morphologique. Il permet de réaliser une classification en 39 morphogroupes par la combinaison de réseaux de neurones artificiels avec des modèles statistiques. Les résultats sont présentés sous forme de comptages automatisés, de données morphométriques (taille, masse...) et de mosaïques d'images. Il peut ainsi être utilisé pour des analyses biostratigraphiques et paléocéanographiques
SYRACO is an automated recognition system of coccoliths, originally developed since 1995 by Luc Beaufort and Denis Dollfus, and more recently with the help of Yves Gally. The main purpose of this system is for specialists to save time in the acquisition and treatment of data. By this recent work, the system has been technically improved and its ability of recognition has been extended to calcareous nannofossils of the Cenozoic Era. It sorts nannofossils and non-nannofossils with a reliability respectively estimated to 75% and 90%. It is based on a new reference images database of species from the Upper Eocene up to living species. This represents hundreds of species with a high morphological variability. It leads to the establishment of a classification arranged in 39 morphogroups, combining artificial neural networks to statistical models. The results are presented as automated counting, morphometrical data (size, mass...) and mosaics of images. Those results can be valuable in biostratigraphical and paleoceanographical analyses

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Kenjo, Samer. "Biostratigraphie intégrée à nannofossiles calcaires et ammonoïdes : développement et implications pour la définition et la valorisation des stratotypes d’unité et de limite. L’exemple des étages Berriasien et Valanginien et de leur limite (~140 Millions d’années)." Thesis, Lyon 1, 2014. http://www.theses.fr/2014LYO10156.

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L'étude biostratigraphique intégrée des ammonites et des nannofossiles calcaires de trois coupes du SE de la France (Vergol, Courchons et Berrias) a permis de proposer un nouveau schéma de biozonation solide pour l'intervalle Berriasien supérieur – Valanginien inférieur. Cette étude devrait permettre d'appuyer la proposition de la coupe de Vergol comme GSSP de la base du Valanginien. Pour ce qui concerne les ammonites, une exploitation intensive banc par banc et une révision taxonomique de l'ensemble des groupes ont montré un grand renouvellement faunique et ont amené à préciser le schéma zonal. Le Berriasien supérieur est caractérisée dans sa partie haute par une nouvelle zone, la zone à Alpillensis, qui remplace la partie supérieure de la zone à Boisseri sensu Le Hégarat. La zone à Alpillensis est subdivisée en deux sous-zones, à Alpillensis et à Otopeta. Pour le Valanginien inférieur, il a été reconnu la zone à Petransiens, pour laquelle deux nouvelles sous-zones, à Premolicus et à Salinarium, sont proposées, et la zone à Neocomiensiformis. Pour ce qui concerne les nannofossiles calcaires, plusieurs événements caractérisent la limite Berriasien/Valanginien, ainsi qu'un changement important des assemblages mis en évidence par une Analyse en Composante Principale. Ces changements sont liés probablement à une régression globale pendant la zone à Alpillensis suivie par une transgression pendant la zone à Pertransiens. Les Associations Unitaires ont mis en évidence une AU 1 dont le sommet se situe au dessus de la première apparition du nannofossile C. oblongata et de l'ammonite « Thurmanniceras » pertransiens. La succession de ces trois événements (« T. » pertransiens, C. oblongata et sommet de l'AU 1) m'ont amené à proposer l'identification de la limite Berriasien/Valanginien avec la première apparition de « T. » pertransiens
The integrated biostratigraphic study of ammonites and calcareous nannofossils in three sections from SE France (Vergol, Courchons, and Berrias) allowed a solid new biozonation scheme to be proposed here. This study should enable us to strengthen the proposition of the Vergol section as GSSP for the lower boundary of Valanginian. Concerning ammonites, an intensive exploitation bed by bed coupled to a taxonomic revision of all groups have shown a faunal renewal and brought to the proposal of a new zonal scheme. The Upper Berriasian is characterized in its upper part by a new zone, the Alpillensis zone, which replaces the upper part of the Boisseri zone sensu Le Hégarat. The Alpillensis zone is subdivided into two subzones, Alpillensis and Otopeta. For the Lower Valanginian, the Pertransiens (with the introduction of two new subzones, Premolicus and Salinarium) and Neocomiensiformis zones have been recognized. Concerning calcareous nannofossils, many events are recorded across the Berriasian/Valanginian boundary, underlying a major change in the assemblages as indicated by Principal Component Analysis. These changes are very likely linked to sea level changes. In fact, a major regression occurred in the Alpillensis zone, followed by a transgression in the Petransiens zone. Unitary Associations resulted in an UA 1 whose topmost part occurs just above the first occurrences of the nannofossil C. oblongata and of the ammonite « Thurmanniceras » pertransiens. The stratigraphic succession of these three events (namely, the FOs of « T. » pertransiens and of C. oblongata and the top of UA 1) allow us to identify the boundary between the Berriasian and Valanginian in this work with the FO of « T. » pertransiens

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Beaufort, Luc. "Dynamique du nannoplancton calcaire au cours du Néogène : implications climatiques et océanographiques." Lyon 1, 1991. https://tel.archives-ouvertes.fr/tel-02307706/document.

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Les variations de composition des assemblages de nannofossiles calcaires de plusieurs series neogenes (de l'atlantique nord et de l'ocean antarctique, secteur indien) ont ete etudiees. Un interet particulier a ete apporte a la quantification des donnees et a la haute resolution stratigraphique. L'analyse des enregistrements obtenus (grace en particulier au traitement mathematique des signaux) a permis de montrer la grande sensibilite du nannoplancton calcaire aux variations climatiques: (1) le renouvellement du nannoplancton s'effectue durant la derniere deglaciation (dans l'atlantique nord) en suivant de facon proche les changements climatiques. (2) toutes les series du miocene etudiees contiennent des signaux periodiques de frequences identiques a celles du milankovitch (d'ou le lien avec les climats). Il a ete possible d'etudier la modulation des cycles de l'excentricite et voir a quelles epoques ils sont particulierement puissants. (3) de nombreux changements de composition du nannoplancton observes dans ces series miocenes sont correlables directement avec des evenements paleo-oceanographiques ou paleoclimatiques mis en evidence par des etudes des isotopes stables de l'oxygene ou de la teneur en carbonate de calcium des sediments. (4) l'enregistrement le plus long (de 25 a 8,5 ma) permet de retracer les mouvements du front polaire antarctique au miocene de facon tres detaillee (un echantillon tous les 18000 ans). Cinq grandes phases de refroidissement majeures miocenes ont pu etre identifiees

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Ferreira, Jorge. "Palaeoenvironmental and palaeoceanographic changes during the Lower to Middle Jurassic ( Toarcian-Aalenian, ~183-171 Ma) : new evidences from calcareous nannofossils of the Lusitanian Basin." Thesis, Lyon, 2016. http://www.theses.fr/2016LYSE1033/document.

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Le biome marin du Toarcien inférieur a subi une des crises les plus significatives de l'histoire de la Terre, qui a affecté les mers épicontinentales du globe. Ces bassins épicontinentaux sont également caractérisés par l'accumulation de grandes quantités de matière organique dans les sédiments de l'époque, ce qui a été interprété comme le résultat d'un Evénement Anoxique au Toarcien inférieur (T-OAE, ~183 Ma). Le nannoplancton calcaire, qui fait partie des organismes le plus sensibles aux conditions environnementales des eaux océaniques de surface, a été profondément affecté par cette crise et sa récupération se mit en place seulement à la fin du Toarcien inférieur. Si le T-OAE a été étudié en grand détail ces dernières années, la période de récupération est beaucoup moins bien connue. A ce stade, nous ne savons pas, notamment, si la récupération de la production carbonatée primaire est représentée par un épisode rapide ou par une suite d'événements (qui feraient partie d'un plus long processus) intervenus sur quelques millions d'années après le T-OAE. Pendant les perturbations environnementales qui ont eu lieu au Toarcien inférieur, des fluctuations importantes du niveau marin ont été interprétées ainsi que des variations de la température des eaux océaniques. Après le T-OAE, le niveau marin et les températures montrent des changements plus graduels pendant une grande partie du Toarcien supérieur-Aalénien inférieur et les niches écologiques occupées par le nannoplancton calcaire sont ré-établies. Ces conditions de relative stabilité sur le long terme (~10 Ma) sont idéales pour étudier les dynamiques de la communauté des nannofossiles calcaires et, notamment, comment les différents taxons réorganisent leurs relations synécologiques. Le Toarcien-Aalénien est une période clé dans l'évolution du nannoplancton calcaire, avec des nouveaux genres qui apparaissent. Les nannofossiles de cet intervalle restent relativement peu étudié dans le Bassin Lusitanien, malgré l'importance de cette région d'un point de vue paléocéanographique. En effet ce bassin, qui était à l'origine un rift avorté lié à l'ouverture de l'Atlantique, a permis les connections entre des masses d'eaux de provenance NW européenne et sud-téthysienne. C'est dans cette région que nous retrouvons donc des mélanges de taxons liés à des différentes provinces géographiques
At ~183 Ma when large amounts of organic matter was dumped onto the ocean beds (known as the Toarcian Oceanic Anoxic Event, T-OAE), the Early Toarcian marine biota experienced one of the most important biological crises in Earth history. Calcareous nannoplankton was deeply affected and started only to recover from the end of the Early Toarcian. After the T-OAE, as phytoplankton communities dwelling the oceans photic layer recover from the previous disturbing conditions, the ecological niches once occupied by calcareous nannoplankton are again replenished. Located in the westernmost part of the Tethyan ocean, the Lusitanian Basin acted as a seaway between the NW Tethys and the Mediterranean Tethys provinces, therefore been actively influenced by these two different water masses. Hence such a region stands as the perfect spot to study the calcareous nannoplankton community, as its fossil remains bears species typical of both provinces. In order to appraise the nannoplankton demise and subsequent recovery, absolute and relative abundances of nannofossils were determined from pelagic marl-limestone couplets from three sections of the Lusitanian Basin. Also brachiopods shells were investigated for stable carbon and oxygen isotopes analysis. In order to independently assess the morphologic evolution of Lotharingius coccoliths, a Toarcian section from south France was studied. Different statistic methodologies were used throughout this work, in order to screen for robust and significant information from the numerous datasets that were built
Há cerca de 183 milhões de anos atrás, a biota marinha sofreu uma das mais importantes crises biológicas na história do planeta, quando grandes quantidades de matéria orgânica foram depositadas nos fundos oceânicos. Este episódio que teve lugar durante o Toarciano, resultou de um Evento Anóxico Oceânico (T-OAE), e afectou os mares epicontinentais à escala global. O nanoplâncton calcário, um grupo de organismos extremamente sensível às variações nas condições ambientais que têm lugar na camada superficial das massas de água, foi profundamente afectado. Foi somente no final do Toarciano Inferior que a sua recuperação se iniciou. Apesar de já muito se ter escrito sobre o T-OAE, a previsível recuperação deste grupo nunca foi sistemática nem detalhadamente estudada. Até hoje, não se sabia ainda se esta recuperação teria sido relativamente rápida, ou resultado de um processo lento e gradual que teria durado milhões de anos. Durante o Toarciano Inferior, quando as condições ambientais eram extremamente instáveis, ocorreram importantes e drásticas oscilações na temperatura e no nível médio dos oceanos. Após o T-OAE e durante todo o Toarciano e Aaleniano Inferior, as oscilações do nível médio dos oceanos e de temperatura são bastante mais suaves. À medida que a comunidade fitoplanctónica instalada na zona fótica recupera das condições extremas anteriores, os nichos ecológicos antes ocupados por nanoplâncton calcário, começam novamente a ser preenchidos. Apesar das prolongadas e suaves variações abióticas, é num ambiente então mais estável, que melhor se pode observar a evolução deste grupo, e de que forma as suas relações sinecológicas se alteraram ao longo de aproximadamente 10 milhões de anos. Apesar de ser considerado como um período onde a comunidade nanoplanctónica sofreu importantes alterações, nada se sabe em concreto que alterações foram essas que tiveram lugar após o TOAE num local tão estratégico como a Bacia Lusitânica. Situada na extremidade Oeste do Tétis e fazendo parte de um rift originado pela abertura do Atlântico, a Bacia Lusitânica actuou como um corredor que ligava livremente as massas de água das províncias mediterrânica e NW do Tétis, sendo por estas, activamente influenciada. Por essa razão, tal situação geográfica constitui um local excepcional para se estudar a comunidade de nanoplâncton calcário, uma vez que o seu registo fóssil compreende espécies típicas destas duas províncias do Tétis

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Giraudeau, Jacques. "Les nannofossiles calcaires quaternaires de la Mer des Caraïbes : biostratigraphie, essai de paléoclimatologie quantitative." Bordeaux 1, 1990. http://www.theses.fr/1990BOR10632.

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Les nannofossiles calcaires quaternaires de 4 sections prelevees en mer de caraibes sont etudies d'un point de vue systematique, biostratigraphique et paleoecologique. Les apparitions, disparitions et acmes des coccolithes appartenant aux genres gephyrocapsa, emiliania et pseudoemiliania permettent de proposer une nouvelle biozonation pour les 500000 dernieres annees en domaine tropical. Une analyse mathematique (fonction de transfert) est testee afin d'etablir des equations ecologiques liant les temperatures et salinites superficielles aux associations de nannofossiles recents. L'application de ces equations aux associations fossiles permet de retracer l'evolution hydrologique des eaux de surface caraibes en relation directe avec la succession des episodes glaciaires quaternaires. Les resultats indiquent une identite des processus climatiques et hydrologiques entre, d'une part, les episodes glaciaires et l'hiver actuel, d'autre part, les episodes interglaciaires et l'ete actuel

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BOUALLOU, LAMIA. "Les nannofossiles calcaires quaternaires de l'ocean indien occidental : etude biostratigraphique, ecologique, biogeographique et paleoclimatologique." Nice, 1996. http://www.theses.fr/1996NICE4975.

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Le contenu nannofloral des sediments de quatre carottes d'age quaternaire, prelevees dans l'ocean indien occidental, a fait l'objet d'une etude biostratigraphique detaillee, afin d'etablir une chronologie a haute resolution pour les 500 000 dernieres annees. Les coccolithes du genre gephyrocapsa sont ranges en trois groupes taxinomiques distincts, sur la base de criteres morphologiques observables au microscope optique. Les acmes de ces trois groupes, ainsi que l'apparition d'emiliania huxelyi et la disparition de pseudoemiliania lacunosa, permettent de definir une biozonation du pleistocene terminal pour l'ocean indien occidental. D'autres especes de nannofossiles dites ecologiques ont ete analysees qualitativement, dans le but de fournir des precisions relatives aux preferences ecologiques des differentes especes. La distribution de ces especes semble etre reliee significativement aux paleotemperatures, ainsi qu'a des processus hydrologiques particuliers (upwellings) ou a des masses d'eaux distinctes de l'ocean indien. L'application d'une analyse factorielle a la distribution des nannofossiles, permet de retracer les paleocirculations des 500 000 dernieres annees, et en particulier de reconstituer les fluctuations latitudinales de la zone de divergence sud-equatoriale et la zone de convergence subtropicale dans l'ocean indien occidental

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Thibault, Nicolas. "Le nannoplancton calcaire au cours du Maastrichtien : aspects paléoécologiques et biostratigraphiques." Paris 6, 2005. http://www.theses.fr/2005PA066613.

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Chaumeil, Rodriguez Micaela. "Calcareous nannofossils from Los Molles Formation, south of Huincul High, Neuquén Basin, Argentina : biostratigraphy and paleobiogeographic reconstructions for the Early to Middle Jurassic (Pliensbachian-Aalenian)." Electronic Thesis or Diss., Lyon 1, 2023. http://www.theses.fr/2023LYO10116.

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Les nannofossiles calcaires représentent un groupe diversifié de fossiles, remontant au Trias supérieur et s'étendant jusqu'à nos jours, caractérisés par leur composition calcaire et une taille inférieure à 30 µm. Parmi eux, les coccolithophoridés, qui constituent la fraction la plus importante du nannoplancton calcaire, c'est-à-dire des algues unicellulaires flagellées typiquement marins appartenant à la sous-classe Calcihaptophycidae, recouvertes de plaques de carbonate de calcium (coccolithes). Les représentants fossiles des coccolithophoridés correspond à leurs restes d'exosquelette, généralement conservés sous une forme désagrégée, comme des coccolithes individuels. Leur présence dans les océans est essentielle, car ils constituent l'un des principaux groupes de producteurs primaires marins. Les données géologiques suggèrent que les coccolithophoridés ont maintenu leurs exigences écologiques presque inchangées au fil du temps, et ainsi nous permettant de reconstruire de manière fiable les conditions paléoenvironnementales, paléobiogéographiques et paléoclimatiques. L'objectif général de cette thèse est d'étudier les associations de nannofossiles calcaires des sédiments marins du Jurassique inférieur-moyen au sud haut structural de Huincul du bassin de Neuquén (Argentine) et de combiner ces informations avec celles déjà disponibles afin d'élargir et d'améliorer les ressources biostratigraphiques du bassin. En comparant ces enregistrements avec des associations de nannofossiles calcaires provenant d'autres endroits du monde, nous visons à établir des corrélations d'âge globales et à évaluer les relations paléobiogéographiques, afin de générer un modèle biostratigraphique local. L'étude se concentre sur des échantillons provenant de trois sections d'affleurement et de deux forages d'exploration. Un total de 102 échantillons de surface et 111 échantillons de subsurface ont été étudiés. En outre, des analyses géochimiques (i.e. les isotopes stables du carbone, la matière organique totale et la composition élémentaire) ont été effectuées sur 384 échantillons d'affleurement. Des techniques de décantation aléatoire et de décantation par gravité ont été utilisées pour traiter les échantillons de nannofossiles. Le degré de similitude entre les associations de nannofossiles a été évalué en effectuant une analyse NMDS et une analyse UPGMA, en utilisant l'indice de similitude de Dice. La pyrolyse et la spectrométrie de masse du rapport isotopique ont été utilisées pour traiter les échantillons en vue de l'analyse de la matière organique totale et des isotopes stables, respectivement. Pour l'analyse élémentaire, la technique de diffraction des rayons X a été utilisée. Quarante-neuf espèces sont ici décrites, répartis dans neuf famillies et une espèce insertae sedis, dont cinq sont reconnues pour la première fois pour le bassin et le Pacifique sud-est. Six biozones et de nombreuses sous-zones sont reconnues en surface et subsurface, et sont en corrélation avec les schémas biostratigraphiques de la région de la Téthys. Elles correspondent au Pliensbachien à l'Aalénien moyen - Bajocien inférieur (NJT4–NJT9). Trois intervalles d'excursions isotopiques négatives accompagnées d'augmentations de la teneur en matière organique sont identifiés. Le premier d'entre eux est considéré comme l'équivalent temporel de le T-OAE. Les autres excursions de grande amplitude enregistrées au Toarcien moyen et dans l'intervalle Toarcien-Aalénien représentent le premier enregistrement de ce type pour l'intervalle Toarcien-Aalénien dans le bassin de Neuquén, et le deuxième enregistrement pour l'hémisphère sud. Les associations de nannofossiles calcaires du Pliensbachien sont liées à celles de la région de Téthys. Le Corridor hispanique est identifié comme la voie de dispersion des nannofossiles calcaires entre les océans Paléo-Pacifique et Téthys au cours du Jurassique inférieur, ce qui indique que son ouverture remonte au moins au début du Pliensbachien
Calcareous nannofossils represent a diverse group of fossils, dating back to the Late Triassic and extending their record to the present day, characterised by their calcareous composition and a size under 30 microns. Among them oustand the coccolithophorids, which constitute the most important fraction of calcareous nannoplankton, i.e. flagellated unicellular algae belonging to the Subclass Calcihaptophycidae, covered by calcium carbonate plates (coccoliths), and typically marine inhabitants of the photic zone. The representation of coccolithophorids in the fossil record corresponds to their exoskeletal remnants, commonly preserved in a disaggregated form, as individual coccoliths. Their presence in the oceans is key as they are one of the main groups of marine primary producers. Evidence from the geological record suggests that coccolithophorids have maintained their ecological requirements almost invariant over time, making them key to reconstruct palaeoenvironmental, palaeobiogeographical and palaeoclimatic conditions. The aim of this thesis is to study the calcareous nannofossil associations of Early-Middle Jurassic marine sediments, south of the Huincul High, Neuquén Basin (Argentina). By combining this information with that already available, we seek to expand and improve the biostratigraphic resources of the basin, determine similarities with assemblages from other regions of the world, and evaluate the response of these organisms to important palaeoenvironmental events. The study focuses on samples from three outcrop sections —named El Matuasto I, II and III— and two exploratory boreholes —YPF.Nq.BCE.x-1 and YPF.Nq.PTU.x-2—. A total of 102 surface samples, 20 core samples and 91 drill cuttings samples were studied. In addition, geochemical analyses (i.e., stable carbon isotopes, total organic matter and elemental composition) were performed on 384 outcrop samples. Random settling and gravity settling techniques were used to process the calcareous nannofossil samples. Quantitative analysis of nannofossils required counting at least 300 individuals; in case of a sample with low abundance, counting stopped at 450 fields of view. The degree of similarity between nannofossil associations was assessed by running NMDS and UPGMA analyses, both using the Dice index. Pyrolysis and isotope ratio mass spectrometry were used to process samples for total organic matter and stable isotope analysis, respectively. For the elemental analysis, the X-ray diffraction technique was executed. In all cases, samples containing shell remains and/or evidence of weathering were avoided. Forty-nine species are described, distributed in nine families and one species insertae sedis, of which five are recognised for the first time for the basin and the southeast Pacific area, and most of them are illustrated. Six biozones and numerous subzones are recognized on the surface and subsurface sections and correlate with biostratigraphic schemes of the Tethys region. These correspond to the Pliensbachian (Biozone NJT4) to the middle Aalenian - early Bajocian (Biozone NJT9). Three intervals of negative isotopic excursions accompanied by increases in organic matter content are identified. Applying the biostratigraphic framework, the first of these is considered to be the time-equivalent of the Toarcian Oceanic Anoxic Event (T-OAE). The other high-amplitude isotope excursions recorded in the middle Toarcian and in the Toarcian-Aalenian interval represent the first record of their kind for the Toarcian - Aalenian interval in the Neuquén Basin, and the second record for the southern hemisphere. The Pliensbachian calcareous nannofossil associations recognized in one of the sections are biogeographically related to those of the Tethys region. The Hispanic Corridor is identified as the pathway of calcareous nannofossil dispersal between the Pacific and Tethys oceans during the Early Jurassic, indicating its time of opening at least from the early Pliensbachian

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Books on the topic "Nannofossiles"

1

1955-, Crux Jason A., and Heck, Shirley E. van 1952-, eds. Nannofossils and their applications: Proceedings of the International Nannofossil Association Conference, London, 1987. Chichester [England]: E. Horwood for the British Micropalaeontological Society, 1989.

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Bown, Paul R., ed. Calcareous Nannofossil Biostratigraphy. Dordrecht: Springer Netherlands, 1998. http://dx.doi.org/10.1007/978-94-011-4902-0.

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R, Bown P., ed. Calcareous nannofossil biostratigraphy. London: Chapman & Hall, 1998.

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R, Bown P., ed. Calcareous nannofossil biostratigraphy. Dordrecht: Kluwer Academic, 1999.

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Shafik, Samir. Late cretaceous nannofossil biostratigraphy and biogeography of the Australian western margin. Canberra: Australian Govt. Pub. Service, 1990.

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Bown, P. R. Taxonomy, evolution, and biostratigraphy of Late Triassic-Early Jurassic calcareous nannofossils. London: Palaeontological Association, 1987.

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Romaniv, A. M. Izvestkovyĭ nanoplankton melovykh i paleogenovykh otlozheniĭ Ukrainskikh Karpat. Kiev: Naukova dumka, 1991.

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Cachão, Mário Albino Pio. Utilização de nanofósseis calcários em biostratigrafia, paleoceanografia e paleoecologia: Aplicações ao neogénico do Algarve (Portugal) e do Mediterrâneo Ocidental (ODP653) e à problemática de Coccolithus pelagicus. Lisboa: Faculdade de Ciências da Universidade de Lisboa, Departamento de Geologia, Centro de Geologia, 1998.

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Amerom, H. W. J. van., ed. Salpingostoma prinsii nov. sp. and Gnetopsis robusta nov. sp., two new seeds from the Westphalian A/B of southern Limburg ; Late Quaternary calcareous nannoplankton biostratigraphy for the northern Atlantic Ocean. [Haarlem?]: Geological Survey of the Netherlands, 1990.

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Kienel, Ulrike. Die Entwicklung der kalkigen Nannofossilien und der kalkigen Dinoflagellaten-Zysten an der Kreide/Tertiär-Grenze in Westbrandenburg im Vergleich mit Profilen in Nordjütland und Seeland (Dänemark). Berlin: Selbstverlag Fachbereich Geowissenschaften, 1994.

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Book chapters on the topic "Nannofossiles"

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Thierstein, Hans R. "Nannofossils Coccoliths." In Encyclopedia of Marine Geosciences, 1–4. Dordrecht: Springer Netherlands, 2014. http://dx.doi.org/10.1007/978-94-007-6644-0_78-3.

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Thierstein, Hans R. "Nannofossils Coccoliths." In Encyclopedia of Marine Geosciences, 537. Dordrecht: Springer Netherlands, 2016. http://dx.doi.org/10.1007/978-94-007-6238-1_78.

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Jain, Sreepat. "Calcareous Nannofossils." In Fundamentals of Invertebrate Palaeontology, 193–260. New Delhi: Springer India, 2019. http://dx.doi.org/10.1007/978-81-322-3962-8_10.

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Houghton, S. D. "Calcareous Nannofossils." In Calcareous Algae and Stromatolites, 217–66. Berlin, Heidelberg: Springer Berlin Heidelberg, 1991. http://dx.doi.org/10.1007/978-3-642-52335-9_13.

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Thierstein, Hans R. "Nannofossils and Coccoliths." In Encyclopedia of Marine Geosciences, 1–3. Dordrecht: Springer Netherlands, 2015. http://dx.doi.org/10.1007/978-94-007-6644-0_78-4.

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Bown, P. R., and J. R. Young. "Introduction." In Calcareous Nannofossil Biostratigraphy, 1–15. Dordrecht: Springer Netherlands, 1998. http://dx.doi.org/10.1007/978-94-011-4902-0_1.

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Bown, P. R., and J. R. Young. "Techniques." In Calcareous Nannofossil Biostratigraphy, 16–28. Dordrecht: Springer Netherlands, 1998. http://dx.doi.org/10.1007/978-94-011-4902-0_2.

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Bown, P. R., and D. Janofske. "Triassic." In Calcareous Nannofossil Biostratigraphy, 29–33. Dordrecht: Springer Netherlands, 1998. http://dx.doi.org/10.1007/978-94-011-4902-0_3.

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Bown, P. R., and M. K. E. Cooper. "Jurassic." In Calcareous Nannofossil Biostratigraphy, 34–85. Dordrecht: Springer Netherlands, 1998. http://dx.doi.org/10.1007/978-94-011-4902-0_4.

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Bown, P. R., D. C. Rutledge, J. A. Crux, and L. T. Gallagher. "Lower Cretaceous." In Calcareous Nannofossil Biostratigraphy, 86–131. Dordrecht: Springer Netherlands, 1998. http://dx.doi.org/10.1007/978-94-011-4902-0_5.

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Conference papers on the topic "Nannofossiles"

1

Clark, William B., M. W. Clark, and R. K. Clark. "FRACTAL GEOMETRY OF NANNOFOSSIL SPECIES DISCOASTER PENTARADIATUS." In GSA Annual Meeting in Denver, Colorado, USA - 2016. Geological Society of America, 2016. http://dx.doi.org/10.1130/abs/2016am-284950.

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Tatge, Emma, Denise K. Kulhanek, and Gary D. Acton. "PLEISTOCENE CALCAREOUS NANNOFOSSIL ASSEMBLAGES FROM THE MOZAMBIQUE CHANNEL." In 54th Annual GSA South-Central Section Meeting 2020. Geological Society of America, 2020. http://dx.doi.org/10.1130/abs/2020sc-343777.

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Kadar*, Adi P., and Khalaf A. Karam. "Early Bajocian to Early Maastrichtian Calcareous Nannofossils Biostratigraphy of Onshore Kuwait." In International Conference and Exhibition, Melbourne, Australia 13-16 September 2015. Society of Exploration Geophysicists and American Association of Petroleum Geologists, 2015. http://dx.doi.org/10.1190/ice2015-2209064.

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P. Kadar, Adi. "Calcareous Nannofossils from Middle to Upper Jurassic Sediments of North Kuwait Onshore." In GEO 2010. European Association of Geoscientists & Engineers, 2010. http://dx.doi.org/10.3997/2214-4609-pdb.248.369.

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R. Young, C., and E. A. Spinler. "Synchronous variations in nannofossils assemblages and petrophysical parameters of North Sea chalks." In EAPG/AAPG Special Conference on Chalk. European Association of Geoscientists & Engineers, 1994. http://dx.doi.org/10.3997/2214-4609.201407554.

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Rosmadi, Nur Syahirah, Nursufiah Sulaiman, Noorzamzarina Sulaiman, and Junaidi Asis. "Comparison of different optical mounting medias used on calcareous nannofossils smear slides." In INTERNATIONAL CONFERENCE ON BIOENGINEERING AND TECHNOLOGY (IConBET2021). AIP Publishing, 2022. http://dx.doi.org/10.1063/5.0078842.

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Golovina, L. A. "MIOCENE CALCAREOUS NANNOFOSSILS OF EASTERN PARATETHYS: SIGNIFICANCE FOR BIOSTRATIGRAPHY, PALEOGEOGRAPHY AND PALEOECOLOGY." In Актуальные проблемы современной палинологии. Москва: Общество с ограниченной ответственностью "Издательство ГЕОС", 2022. http://dx.doi.org/10.54896/9785891188532_2022_25.

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Erba, Elisabetta, and Cinzia Bottini. "CALCAREOUS NANNOFOSSIL PALEOFLUXES AS PROXY FOR PALEOCO2 DURING THE APTIAN." In GSA Annual Meeting in Denver, Colorado, USA - 2016. Geological Society of America, 2016. http://dx.doi.org/10.1130/abs/2016am-284637.

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Kadar, A. P., S. Crittenden, and K. A. Karam. "Middle Jurassic to Early Cretaceous Calcareous Nannofossils from Onshore North Kuwait: A New Record." In Fourth Arabian Plate Geology Workshop. Netherlands: EAGE Publications BV, 2012. http://dx.doi.org/10.3997/2214-4609.20142776.

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Belia, Emilia R., and Kevin E. Nick. "EARLY-MIOCENE CALCAREOUS NANNOFOSSIL BIOSTRATIGRAPHY FROM LOW-LATITUDE, PISCO BASIN, PERU." In 112th Annual GSA Cordilleran Section Meeting. Geological Society of America, 2016. http://dx.doi.org/10.1130/abs/2016cd-274218.

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Reports on the topic "Nannofossiles"

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Bown, P. R. Calcareous Nannofossils From the Late Triassic - Early Jurassic of the Queen Charlotte Islands, British Columbia. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1991. http://dx.doi.org/10.4095/132623.

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Stoykova, Kristalina, Georgi Granchovski, and Clemens V. Ullmann. First Data on the Expression of the CampanianMaastrichtian Boundary Event in Bulgaria: Calcareous Nannofossil and Carbon Isotope Record. "Prof. Marin Drinov" Publishing House of Bulgarian Academy of Sciences, December 2020. http://dx.doi.org/10.7546/crabs.2020.12.11.

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