Bibliografie tematiche / Milankovich cycles

Letteratura scientifica selezionata sul tema "Milankovich cycles"

Autore: Grafiati

Pubblicato: 8 giugno 2024

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Articoli di riviste sul tema "Milankovich cycles":

Pomortsev, O. A., V. R. Filippov e S. S. Rozhin. "Transgressive Pleistocene Cycles and Their Place on the Milankovich Scale". IOP Conference Series: Earth and Environmental Science 666, n. 3 (1 marzo 2021): 032068. http://dx.doi.org/10.1088/1755-1315/666/3/032068.

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Michael Oldfield Jonas. "The inter-glacial cycle is not a 100,000-year cycle, it is a shorter cycle with missing beats". World Journal of Advanced Research and Reviews 13, n. 3 (30 marzo 2022): 388–92. http://dx.doi.org/10.30574/wjarr.2022.13.3.0259.

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The "100,000-year problem" refers to an apparent unexplained change in the frequency of inter-glacial periods which occurred about a million years ago. Before that, inter-glacial periods seemed to occur about every 41,000 years, in line with the obliquity Milankovich cycle. But after that, they seemed to occur about every 100,000 years, in line with the orbital inclination Milankovich cycle. Examination of the data shows that there never was a 41,000-year cycle, and that there is no 100,000-year cycle, but that the most influential cycle is the approx 21,000-year precession cycle which is the major factor in the cycles of insolation at higher latitudes. Insolation at 65N is generally regarded as the most significant of these. Inspection of the data shows that every glacial termination (start of an inter-glacial period) began at a time when insolation at 65N increased from a low point in its cycle. That not every such cycle triggered a new inter-glacial period underlines the chaotic non-linear nature of Earth's climate. Until about a million years ago, this cycle occasionally "missed a beat", making the inter-glacial frequency average about 41,000 years. After that, the cycle started missing more "beats", making the inter-glacial frequency average about 100,000 years. There never was an actual 41,000-year or 100,000-year inter-glacial cycle.

Pomortsev, O. A. "The response of rhythmically forming processes to the latitudinal position of the zones of their implementation". Vestnik of North-Eastern Federal University Series "Earth Sciences", n. 3 (21 settembre 2023): 35–41. http://dx.doi.org/10.25587/svfu.2023.31.3.005.

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The problem of variability of the Milankovich scale and cyclic oscillations in the troposphere circulation mode depending on the geographical latitude of the area is investigated. Parallels in the dynamics of multi-thousand-year and intra-century climate cycles in different latitudinal zones and possible causes of this phenomenon are considered. New data on the influence of axial rotation and the shape of the Earth on the structure of rhythm-forming processes are presented. It is established that the zone with a high frequency of pulsations of climatic phases is confined to low latitudes with the highest energy potential. The dependence of the velocity of air currents on the length of geographical parallels is shown. Thus, during the formation of air currents near the equator – the longest parallel of the planet (Hadley circulation cell), their velocity, which is set by the axial rotation of the Earth, is higher than the speed of sound and twice as high as similar flows originating in the temperate latitudes (Ferell cell). Paleogeographic evidence confirming Milankovich’s calculations about the different duration of the solar cycle period in the low, temperate and polar latitudes is presented. Thus, the dating of the terraces of the island of Barbados in the Caribbean Sea (low latitudes) showed that the period of the Milankovich cycle here is close to 20 thousand years. While in the zone of temperate latitudes, the period of the same cycle, judging by the dating of the stadial moraines of the former glacial covers, is 41 thousand years, i. e. twice as long. Maximum – up to 100 thousand years – set for polar latitudes in the study of the ice sheets of Antarctica and Greenland. Different degrees of meteorological impacts on ecosystems and the level of natural hazards within different latitudinal corridors have been revealed. The most dynamic and dangerous are the low latitudes with their hurricanes, typhoons, floods and storms with high frequency. This should be taken into account when developing a strategy for the economic development of high-risk territories and preventive measures for the protection of engineering orientation.

Solé, J., A. Turiel e J. E. Llebot. "Using empirical mode decomposition to correlate paleoclimatic time-series". Natural Hazards and Earth System Sciences 7, n. 2 (17 aprile 2007): 299–307. http://dx.doi.org/10.5194/nhess-7-299-2007.

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Abstract. Determination of the timing and duration of paleoclimatic events is a challenging task. Classical techniques for time-series analysis rely too strongly on having a constant sampling rate, which poorly adapts to the uneven time recording of paleoclimatic variables; new, more flexible methods issued from Non-Linear Physics are hence required. In this paper, we have used Huang's Empirical Mode Decomposition (EMD) for the analysis of paleoclimatic series. We have studied three different time series of temperature proxies, characterizing oscillation patterns by using EMD. To measure the degree of temporal correlation of two variables, we have developed a method that relates couples of modes from different series by calculating the instantaneous phase differences among the associated modes. We observed that when two modes exhibited a constant phase difference, their frequencies were nearly equal to that of Milankovich cycles. Our results show that EMD is a good methodology not only for synchronization of different records but also for determination of the different local frequencies in each time series. Some of the obtained modes may be interpreted as the result of global forcing mechanisms.

Salamatin, Andrey N., e Catherine Ritz. "A simplified multi-scale model for predicting climatic variations of the ice-sheet surface elevation in central Antarctica". Annals of Glaciology 23 (1996): 28–35. http://dx.doi.org/10.3189/s0260305500013227.

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The equation describing the surface evolution of a large ice sheet is examined on the basis of a scale analysis applied to Antarctic conditions. Changes in the surface elevation are mainly driven by mass-balance fluctuations which approximately follow global atmospheric temperature variations. The essential spatial non-uniformity of the accumulation rate and the resultant difference between central and coastal regions in reaction time-scales are taken into account. The dynamic interaction of the time-lagging interior with the quasi-stationary margin is described. As a result, a simplified model is deduced to simulate the surface-elevation variations in the central parts of the Antarctic ice sheet caused by mass-balance perturbations corresponding to the main Milankovich cycles with the periods of 19–100 kyears. Special computational tests are performed to validate the model through intercomparison with the predictions obtained with a two-dimensional thermomechanical model. The sensitivity of the model to physical factors (represented by dimensionless tuning parameters) is discussed. Climatically controlled variations of the ice-sheet thickness in the vicinity of Vostok Station during the past 200 kyears are estimated.

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Lopes, Fernando, Vincent Courtillot, Dominique Gibert e Jean-Louis Le Mouël. "Extending the Range of Milankovic Cycles and Resulting Global Temperature Variations to Shorter Periods (1–100 Year Range)". Geosciences 12, n. 12 (5 dicembre 2022): 448. http://dx.doi.org/10.3390/geosciences12120448.

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The Earth’s revolution is modified by changes in inclination of its rotation axis. Its trajectory is not closed and the equinoxes drift. Changes in polar motion and revolution are coupled through the Liouville–Euler equations. Milanković (1920) argued that the shortest precession period of solstices is 20,700 years: the summer solstice in one hemisphere takes place alternately every 11,000 year at perihelion and at aphelion. Milanković assumed that the planetary distances to the Sun and the solar ephemerids are constant. There are now observations that allow one to drop these assumptions. We have submitted the time series for the Earth’s pole of rotation, global mean surface temperature and ephemeris to iterative Singular Spectrum Analysis. iSSA extracts from each a trend a 1 year and a 60 year component. Both the apparent drift of solstices of Earth around the Sun and the global mean temperature exhibit a strong 60 year oscillation. We monitor the precession of the Earth’s elliptical orbit using the positions of the solstices as a function of Sun–Earth distance. The “fixed dates” of solstices actually drift. Comparing the time evolution of the winter and summer solstices positions of the rotation pole and the first iSSA component (trend) of the temperature allows one to recognize some common features. A basic equation from Milankovic links the derivative of heat received at a given location on Earth to solar insolation, known functions of the location coordinates, solar declination and hour angle, with an inverse square dependence on the Sun–Earth distance. We have translated the drift of solstices as a function of distance to the Sun into the geometrical insolation theory of Milanković. Shifting the inverse square of the 60 year iSSA drift of solstices by 15 years with respect to the first derivative of the 60 year iSSA trend of temperature, that is exactly a quadrature in time, puts the two curves in quasi-exact superimposition. The probability of a chance coincidence appears very low. Correlation does not imply causality when there is no accompanying model. Here, Milankovic’s equation can be considered as a model that is widely accepted. This paper identifies a case of agreement between observations and a mathematical formulation, a case in which an element of global surface temperature could be caused by changes in the Earth’s rotation axis. It extends the range of Milankovic cycles and resulting global temperature variations to shorter periods (1–100 year range), with a major role for the 60-year oscillation).

Smirnov, Boris M. "Physics of the Earth’s Glacial Cycle". Foundations 2, n. 4 (7 dicembre 2022): 1114–28. http://dx.doi.org/10.3390/foundations2040073.

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The evolution of the atmospheric temperature in the past, resulted from the EPICA project (European Project for Ice Coring in Antarctica) for the analysis of air bubbles in ice deposits near three weather stations in Antarctica, includes several glacial cycles. According to these studies, the glacial cycle consists of a slow cooling of the Earth’s surface at a rate of about 10−4∘C per year for almost the entire time of a single cycle (about 100 thousand years) and of a fast process of heating the planet, similar to a thermal explosion. The observed cooling of the planet follows from the imbalance of energy fluxes absorbed by the Earth and going into its surrounding space, and this imbalance is four orders of magnitude less than the accuracy of determination of the fluxes themselves. The inconsistency of the popular Milankovich theory is shown, according to which glacial cycles in the evolution of the Earth’s thermal state are associated with changes in the Earth’s orbit relative to the Sun. In considering the glacial cycle as the transition between the warm (contemporary) and cold thermal states of the Earth with a difference in their temperatures of 12 ∘C according to measurements, we construct the energetic balance for each of Earth’s states. The fast transition between the Earth’s cold and warm states results from the change of the Earth’s albedo due to the different volcano activity in these states. There is the feedback between the aggregate state of water covering the Earth’s surface and volcanic eruptions, which become intense when ice covers approximately 40% of the Earth’s surface. Dust measurements in ice deposits within the framework of the EPICA project confirms roughly a heightened volcano eruption during the cold phase of the glacial cycle. Numerical parameters of processes related to the glacial cycle are analyzed.

Gabdullin, R. R., A. Yu Puzik, S. I. Merenkova, I. R. Migranov, N. V. Badulina, A. V. Ivanov e M. D. Kazurov. "Lithological and geochemical characteristics and paleoclimatic conditions of the origin of Upper Cretaceous deposits of the epicontinental basin of the Russian plate in the region of the Ulyanovsk-Saratov foredeep". Moscow University Bulletin. Series 4. Geology 1, n. 2 (28 gennaio 2022): 20–33. http://dx.doi.org/10.33623/0579-9406-2021-2-20-33.

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The results of a geochemical study and paleogeographic, paleoclimatic interpretation for a cyclically constructed section of upper Cretaceous deposits near Volsk city, Saratov region, are presented. Elementary formation cyclites and cyclic variations of a number of certain parameters were associated with the Milankovich astronomical-climatic cycles. The curves of changes of paleotemperature, humidity, paleobathymetry were compiled. The results obtained give an idea of the migration of the arid belt boundaries in the upper Cretaceous and the overall climatic zonation, which is important for regional and global paleoclimatic reconstructions, as well as the history of the development of shelf seas that covered the Russian plate (especially Ulyanovsk-Saratov trough). Paleotemperatures of the land surface in the denudation areas are obtained from the chemical index of alteration (CIA). In the Turonian-Campanian interval selected climatic cyclicity, including period of relative cooling (Turonian–Coniacian) with paleotemperature about 20 °С, the period of relative warming in the mid-late Campanian (20–24 °С), the cooling time at the end of the late Campanian (19–21 °С) and the period of warming at the turn of the Campanian and Maastrichtian and in the early Maastrichtian time. In Maastrichtian age, there are two climatic cycles, beginning with a time of relative cooling (about 19 °С) and ending with a time of relative warming (about 20 С, at the end of Maastrichtian to 25 °С). The cycles of climate humidity change are also determined: two cycles in Campanian time, three cycles in early Maastrichtian, and one cycle in late Maastrichtian. The boundary of the early and late Maastrichtian corresponds to the change of arid conditions to humid ones. The paleobatimetry curves show transgressive-regressive cycles: one in the late Turonian-Coniacian time, two in the late Campanian time, five in the early Maastrichtian time, and one in the late Maastrichtian time. Depth variations were estimated: in the Turonian-Coniacian time in the range of 70–80 m, in the Campanian-Maastrichtian time, the paleobatimetry consistently increased and changed from 100 to 200 m (on average about 150 m). The results obtaired give and idea of the migration of the boundaries of the arid belt in the Late Creataceous and main features of the climatic zonation, which is important for regional and global paleoclimatic reconstructions, as well as for the history of the development the Russian plate in the Ulyanovsk-Saratov region.

Salamatin, Andrey N., Elena A. Tsyganova, Vladimir Ya Lipenkov e Jean Robert Petit. "Vostok (Antarctica) ice-core time-scale from datings of different origins". Annals of Glaciology 39 (2004): 283–92. http://dx.doi.org/10.3189/172756404781814023.

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AbstractThree different approaches to ice-core age dating are employed to develop a depth–age relationship at Vostok, Antarctica: (1) correlating the ice-core isotope record to the geophysical metronome (Milankovich surface temperature cycles) inferred from the borehole temperature profile, (2) importing a known chronology from another (Devils Hole, Nevada, USA) paleoclimatic signal, and (3) direct ice-sheet flow modeling. Inverse Monte Carlo sampling is used to constrain the accumulation-rate reconstruction and ice-flow simulations in order to find the best-fit glaciological time-scale matched with the two other chronologies. The general uncertainty of the different age estimates varies from 2 to 6 kyr on average and reaches 6–15 kyr at maximum. Whatever the causes of this discrepancy might be, they are thought to be of different origins, and the age errors are assumed statistically independent. Thus, the average time-scale for the Vostok ice core down to 3350m depth is deduced consistent with all three dating procedures within the standard deviation limits of ±3.6 kyr, and its accuracy is estimated as 2.2 kyr on average. The constrained ice-sheet flow model allows, at least theoretically, extrapolation of the ice age–depth curve further to the boundary with the accreted lake ice where (at 3530m depth) the glacier-ice age may reach ∼2000 kyr.

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Tesi sul tema "Milankovich cycles":

Hoang, Hoai-Nam. "Long term stability and diffusion in the solar system". Electronic Thesis or Diss., Université Paris sciences et lettres, 2023. http://www.theses.fr/2023UPSLO002.

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Le système solaire étant chaotique, l'évolution de l'orbite de la Terre au-delà de 60 millions d'années ne peut être prédite de manière fiable. En revanche, les variations orbitales de la Terre contrôlent l'insolation qui entraîne des changements climatiques à long terme, et ont été imprimées dans les enregistrements géologiques. La récupération de ce forçage astronomique dans les données géologiques a révolutionné la détermination des échelles de temps géologiques. La prise en compte de l'incertitude chaotique du forçage astronomique est une nécessité. Pour aborder ce problème, nous obtenons, évaluons et illustrons l'application de fonctions de densité de probabilité des fréquences séculaires en utilisant kernel density estimation, dont l'incertitude est déterminée par la méthode du moving block bootstrap. En plus d'être chaotiques, les planètes internes du système solaire peuvent également être instables. Malgré le manque de contraintes apparentes qui limitent la dynamique chaotique, la probabilité d'instabilité est remarquablement faible en 5 milliards d'années, surtout si l'on considère qu'elle est 1000 fois plus longue que le temps de Lyapunov du système. Nous tentons de résoudre ce paradoxe dans cette thèse en étudiant la déstabilisation dans sa complexité totale d'un système de haute dimension. Dans un premier temps, nous fournissons une analyse statistique exhaustive de l'instabilité jusqu'à 100 Gyr à partir d'une hiérarchie de modèles séculaires à différents degrés d'excentricités et d'inclinaisons. Nous constatons que l'hamiltonien tronqué au degré 4, malgré son exhaustivité, est trop stable et ne suffit pas à reproduire les statistiques d'instabilité. Ceci est dû à la contribution significative inattendue des termes au degré 6 à la frontière de l'instabilité.Dans un deuxième temps, nous montrons que la dynamique des planètes internes sur son échelle de temps chaotique est lente-rapide avec une large séparation des échelles de temps. La première preuve se trouve dans son spectre de Lyapunov, où une hiérarchie d'exposants caractéristiques s'étend sur deux ordres de grandeur. Les plus petits exposants de Lyapunov peuvent être reliés aux variables lentes, qui varient sur une échelle de temps beaucoup plus longue que le temps de Lyapunov. Concrètement, à partir d'une analyse systématique des résonances séculaires principales, nous démontrons trois quasi-symétries, qui définissent trois quasi-intégrales de mouvement. Par une nouvelle utilisation d'une méthode statistique traditionnelle - l'analyse en composantes principales, nous confirmons que ces quasi-intégrales sont parmi les degrés de liberté les plus lents de la dynamique chaotique. Les quasi-intégrales contraignent la diffusion chaotique à long terme des orbites, ralentissant ainsi le système dans sa trajectoire vers la collision planétaire
Because the Solar System is chaotic, the orbital evolution of the Earth's orbit beyond 60 Myr cannot be reliably predicted. On the other hand, Earth's orbital variations control insolation which leads to long-term climate change, and were thus imprinted in the geological records. The recovery of this astronomical forcing in geological data has revolutionized the determination of the geological time scales. Taking into account the chaotic uncertainty of the astronomical forcing is necessary for a complete astronomical calibration of geological records. To address this problem, we obtain, benchmark and illustrate the application of probability density functions of the secular frequencies using kernel density estimation, whose uncertainty determined by the moving block bootstrap method.Apart from being chaotic, the inner planets of the Solar System can also be unstable. Despite the lack of apparent constraints that bound the chaotic dynamics, the probability of instability is remarkably low in 5 billion years, especially considering it is 1000 times longer than the Lyapunov time of the system. We attempt to resolve the paradox in this thesis by studying the destabilization in its total complexity of a high dimensional system. As a first step, we provide an exhaustive statistical analysis of instability up to 100 Gyr from a hierarchy of secular models at different degrees in eccentricities and inclinations. We find that the Hamiltonian truncated at degree 4, despite its comprehensiveness, is overly stable and not sufficient to reproduce the instability statistics. This is due to the unexpectedly significant contribution of the terms at degree 6 to the frontier of instability. As a second step, we show that the dynamics of the inner planets over its chaotic timescale is slow-fast with a wide separation of timescales. The first evidence is found in its Lyapunov spectrum, where a hierarchy of characteristic exponents spans two orders of magnitude. The smallest Lyapunov exponents can be related to the slow variables, which vary on a timescale much longer than the Lyapunov time. Concretely, from a systematic analysis of the leading secular resonances, we demonstrate three quasi-symmetries, which define three quasi-integral of motion. By a novel utilization of a traditional statistical method - principal component analysis, we confirm that these quasi-integrals are among the slowest degrees of freedom of the chaotic dynamics. The quasi-integrals constrain the long-term chaotic diffusion of the orbits, thereby slowing down the system in their pathway towards planetary collision

Tierney, Kate. "Milankovitch cycles in the distant past /". Columbus, Ohio : Ohio State University, 2002. http://hdl.handle.net/1811/6109.

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Ditchfield, Peter William. "Milankovitch cycles in Cenomanian chalks of the Anglo-Paris Basin". Thesis, University of Liverpool, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.293784.

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Rutherford, Scott David. "Phytoplankton productivity and Milankovitch Cycles in the Cenomanian-Turonian Bridge Creek member of the Greenhorn Formation in southeastern Colorado". Thesis, This resource online, 1994. http://scholar.lib.vt.edu/theses/available/etd-01102009-063011/.

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Sentenac, Françoise. "Etude de séquences loféritiques en domaine carbonaté : leur signification géodynamique". Aix-Marseille 2, 1992. http://www.theses.fr/1992AIX22055.

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Le thème abordé, l' étude des séquences loféritiques, a été traité à partir d'exemples, situés dans deux zones géographiques distinctes : la Provence et l' Italie centrale, à des époques différentes du Mésozoïque, l' étude stratigraphique, basée sur le contenu micropaléontologique (foraminifères et algues calcaires) actualisé et complété, a permis de préciser ou réviser l'attribution stratigraphique de certaines séries. La reconstitution des paléoenvironnements, axée sur les critères hydrologiques, hydrodynamiques et bathymétriques, a mis en évidence quatre grands ensembles biosédimentaires : le domaine de plate-forme interne, caractérisé par des sédiments sableux, ou la biophase est la plus variée et la plus abondante; le domaine marginolittoral exposé, régi par un gradient hydrodynamique élevé ; le domaine marginolittoral abrité, dominé par une sédimentation micritique, ou les variations hydrologiques sont les plus marquées et les indices d'exondation temporaire les plus fréquents; le domaine insulaire caractérisé par des altérations et cimentations du sédiment. L' inventaire des séquences élémentaires et l'analyse des transitions ont montré la diversité du motif séquentiel. Les séquences ont été classées, selon un critère bathymétrique, en trois groupes: les séquences bathydécroissantes, les séquences bathycroissantes, et les séquences bipolaires. L' analyse spectrale a été appliquée à l' étude des rythmes, sur les paramètres facies, hydrodynamisme, et bathymétrie. En complément à cette analyse, une technique nouvelle a été mise au point, afin de déterminer de façon graphique, les variations engendrées par un ou plusieurs des rythmes mis en évidence sur les spectres de puissance. Il ressort que les rythmes les plus significatifs, se situent dans le domaine des basses fréquences et représentent en moyenne 60% des variations de facies et d'hydrodynamisme, mais moins de 50% des variations bathymétriques. Ils rendent compte des fluctuations entre les ensembles plate-forme interne du marginolittoral exposé, et les domaines marginolittoral abrité-insulaire; ainsi que de l'opposition entre des conditions hydrodynamiques fortes et conditions moyennes à nulles Pour la bathymétrie, seules des oscillations de faible amplitude (infralittoral-médiolittoral inférieur) correspondent à ces rythmes. Ces rythmes ont souvent des périodes voisines des cycles de Milankovitch : le premier rythme de l'excentricité de l'orbite terrestre (100000 ans) y est le plus fréquent. L' élaboration des séquences loféritiques se corrèle a des modifications physiographiques de la plate-forme et à une mobilité du talus. La tectonique saccadée du tréfonds combinée àdes phénomènes périodiques astronomiques, détermineraient la sédimentation loféritique.

Giraud, Fabienne. "Recherche des périodicités astronomiques et des fluctuations du niveau marin à partir de l'étude du signal carbonaté des séries pélagiques alternantes : application au crétacé inférieur du Sud-Est de la France (Bassin vocontien)... /". Lyon : Centre des sciences de la Terre, 1995. http://catalogue.bnf.fr/ark:/12148/cb35786572m.

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Boulila, Slah. "Cyclostratigraphie des séries sédimentaires du Jurassique supérieur (Sud-Est de la France, Nord de la Tunisie) : contrôle astro-climatique, implications géochronologiques et séquentielles". Paris 6, 2008. http://www.theses.fr/2008PA066019.

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Une étude cyclostratigraphique à haute résolution a été entreprise, en utilisant les variations de la susceptibilité magnétique (SM), sur trois coupes marneuses oxfordiennes et deux coupes d’alternances marno-calcaires kimméridgiennes du Bassin du Sud-Est de la France. Les séries marneuses oxfordiennes enregistrent avec les plus fortes amplitudes de SM, les cycles d’excentricité à 100 et 405 ka. Les séries d’alternances kimméridgiennes détectent plutôt préférentiellement les cycles de précession. Les durées estimées des zones d’ammonites sont très proches de celles de l’échelle des temps géologiques GTS2004 pour le Kimméridgien inférieur, mais notablement différentes pour l’Oxfordien inférieur et moyen. Comparés aux séquences eustatiques de 3ème ordre de la charte globale de référence, les cycles d’excentricité à 405 ka semblent contrôler les variations du niveau marin relatif au moins durant le Kimméridgien inférieur et l’Oxfordien inférieur et moyen dans le Bassin du Sud-Est.

Binyatov, Elnur. "Sedimentological, Cyclostratigraphic Analysis And Reservoir Characterization Of Balakhany X Formation Within The Productive Series Azeri Field On C01 Well (offshore Azerbaijan)". Master's thesis, METU, 2008. http://etd.lib.metu.edu.tr/upload/3/12609628/index.pdf.

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The Azeri, Chirag, Gunashli (ACG) field is located offshore Azerbaijan. The reservoirs are multilayered sandstones forming traps within a major anticlinal structure. Proven crude oil reserves are estimated to contain 5.4 billion barrels of oil. In the past this area has been studied in regional detail but not at the reservoir scale with respect to the fluvio-deltaic sediments filling the northern shore of the ancient South Caspian Sea. The aim of this study is carried out the sedimentological, cyclostratigraphical analysis and reservoir characterization of Balakhany X Formation within the Productive Series which is considered to be one of the significant producing horizons. To be able to achieve this objective, a 30m thick section, which is mainly composed of siliciclastics, has been studied in detail on Balakhany X cores from C01 well Azeri field. In this study, detailed lithofacies analyses were performed and sandstone, mudstone, siltstone facies were recognized in the studied interval of the Balakhany X Formation. Litharenites and sublitharenites sandstones are the most abundant in the succession. Sedimentological analysis such as grain-size sphericity, provenance, XRD, SEM and grain surface texture were performed and their relationship with depositional environment were discussed. The grain size distribution of the samples along the succession shows distribution of fine to very fine sands. Sorting of sandstones ranges between moderately well to very well sorted. The provenance analysis of sandstones based on modal analysis of thin sections related to recycled orogen. According to interpretation of grain size parameters and grain surface textures analysis the main transporting agent of sands observed as wind, wave and river agents. High resolution cyclostratigraphy studies based on cm-m scaled cyclic occurrences of lithofacies along the measured section were performed. Milankovitch, sub-Milankovitch and millennial cycles were determined along the studied section. The petrophysical analysis revealed good to very good (18 to 24%) porosity and good permeability (10 to 538mD) in Balakhany X Formation. The porosity and permeability are affected by both textural and compositional controls. Grain size distribution along the reservoir section is fine to very fine sands. Influence of compaction was observed by the fractures and dissolutions on the sand grains. The calcite cement, grain-size variation, sorting and compaction are the main factors controlling porosity and permeability.

Liu, Wei. "Influence de la mousson et des changements du niveau marin sur la sédimentation hémipélagique en Mer de Timor au cours des derniers 240 ka". Paris 6, 2011. http://www.theses.fr/2011PA066522.

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Les variations de la composition des sédiments pélagiques permettent d’appréhender les changements de l’environnement au cours du temps et d’en discuter les facteurs de contrôle. C’est ce qui a été tenté sur une carotte prélevée lors de la mission MD122 dans la Mer de Timor, à mi-chemin entre l’Indonésie et l’Australie. La carotte MD01-2376, prélevée à une profondeur de 2906 m, a échantillonné le sédiment sur 27,90 m. Celui-ci est constitué d’une boue biogène calcaréo-siliceuse riche en argile et en matière organique. Le sommet de cette carotte a été daté par 14C et l’ensemble de la carotte a été stratigraphiquement calé grâce aux données isotopiques (δ18O) obtenues sur le foraminifère Globigerinoides ruber. La base de la carotte est datée de 250 000 ans. Ainsi il est possible de suivre l’évolution de la composition du sédiment, et notamment de sa fraction organique, sur cet intervalle de temps et de comparer nos données à celles obtenues antérieurement sur deux carottes voisines situées respectivement à 1783 et 3875 m de profondeur. Les teneurs en carbonate, en carbone organique, le type de matière organique (déterminée par pyrolyse Rock-Eval, analyse C/N et isotopie des kérogènes mais aussi par la détermination des palynofaciès) et l’analyse élémentaire du sédiment par XRF core scanner ont été les principaux marqueurs utilisés. L’analyse en composante principale des données XRF permet de discriminer trois groupes d’éléments dont les comportements sont reliés à (1) la productivité (Ca, Sr, Si, Br, …), (2) aux flux détritiques (Al, K, Ti, Rb, Zr) et (3) aux conditions redox (Mn). L’analyse spectrale des marqueurs organiques et inorganiques et leur comparaison mettent en évidence un double contrôle de la sédimentation : le premier par les variations du niveau marin lors des cycles glaciaires-interglaciaires correspondant aux cycles d’excentricité et le second à plus haute fréquence correspond aux changements de l'intensité de la mousson sous l’influence de la précession des équinoxes. Lors des périodes glaciaires, la mousson du nord-ouest faiblit ce qui diminue les précipitations et permet un brassage des eaux et une plus forte productivité de surface. Celle-ci conduit à des flux exportés plus importants, notamment en carbonate et matière organique. Pour autant, les sédiments glaciaires sont moins carbonatés que leurs homologues interglaciaires car la dégradation de la matière organique et les conditions plus réductrices des eaux de fond favorisaient la dissolution de la calcite. La comparaison des trois carottes révèle des similitudes et des différences. L’amplitude des variations des teneurs en CaCO3 et du Corg sont globalement identiques entre les trois carottes, même si les teneurs en CaCO3 diminuent logiquement avec la profondeur des sites. En revanche, les teneurs en Corg sont quasiment identiques quelle que soit la profondeur du site, ce qui s’explique par une dissolution plus rapide des carbonates que ne l’est la dégradation de la matière organique marine. On note quelques petits décalages temporels ou des comportements différents entre les trois carottes que l’on peut interpréter comme l'influence des circulations d'eau profonde et leur effet sur la préservation des carbonates et/ou de la matière organique. Le palynofacies légèrement différent entre la carotte MD98-2166 et MD01-2376 suggère une plus grande proximité des sources de matière organique terrestre au niveau de la carotte MD98-2166 lors des périodes glaciaires. Enfin, les données isotopiques sur les kérogènes suggèrent une influence des plantes en C4 (d’origine australienne) plus marquée pendant les périodes glaciaires.

Martinez, Mathieu. "Calibration astronomique du Valanginien et de l'Hauterivien (crétacé inférieur) : Implications paléoclimatiques et paléocéanographiques". Phd thesis, Université de Bourgogne, 2013. http://tel.archives-ouvertes.fr/tel-00906955.

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Une calibration orbitale du Valanginien et d'une partie de l'Hauterivien (Crétacé inférieur) est présentée au cours de ce travail. Celles-ci sont basées sur l'identification des cycles de l'excentricité à partir d'analyses spectrales menées sur des proxies climatiques mesurés à haute résolution sur des alternances marne/calcaire hémipélagiques.Cinq coupes de référence sont analysées dans le Bassin Vocontien (Sud-Est de la France), couvrant l'ensemble de l'étage du Valanginien. Une durée de 5,08 Ma est proposée pour cet étage à partir de l'identification du cycle de l'excentricité de 405 ka. Le cadre temporel proposé, combiné aux âges radioisotopiques disponibles, montre que la perturbation en 13C du Valanginien moyen (événement Weissert) est antérieure à la mise en place des trapps du Paraná-Etendeka. La forte expression de l'obliquité dans la partie supérieure du Valanginien pourrait refléter la mise en place de calottes polaires de faible extension.La transition Hauterivien-Barrémien de Río Argos (Sud-Est de l'Espagne) est traitée par une analyse multi-proxies (cortèges argileux et susceptibilité magnétique ou SM). Par comparaison avec les bancs calcaires, les interbancs marneux sont enrichis en kaolinite et en illite, appauvries en smectite et possèdent de fortes valeurs de SM. Cela reflète des conditions tropicales humides lors du dépôt des marnes tandis que les calcaires se déposent en climat semi-aride. Les durées des zones d'ammonite à P. ohmi et à T. hugii sont respectivement estimées à 0,78 Ma et 0,54 Ma. L'événement anoxique Faraoni a une durée comprise entre 100 et 150 ka. Par corrélation avec d'autres coupes, Río Argos apparaît être le meilleur candidat GSSP

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Libri sul tema "Milankovich cycles":

Schwarzacher, Walther. Cyclostratigraphy and the Milankovitch theory. Amsterdam: Elsevier, 1993.

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Hering, Gerd. Milankovitch-Zyklen in mitteldevonischen Schelf-Carbonaten des Rheinischen Schiefergebirges. Göttingen: Im Selbstverlag der Geologischen Institute der Georg-August-Universität Göttingen, 1995.

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Read, J. F. Milankovitch sea level changes, cycles, and reservoirs on carbonate platforms in greenhouse and ice-house worlds: A short course. Tulsa, Okla: SEPM, 1995.

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Read, J. F. Milankovitch sea level changes, cycles, and reservoirs on carbonate platforms in greenhouse and ice-house worlds: A short course organized. Tulsa, Okla: Society for Sedimentary Geology, 1995.

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A response to "Milankovitch theory viewed from Devils Hole" by J. Imbrie, A.C. Mix and D.G. Martinson. Reston, Va: U.S. Dept. of the Interior, Geological Survey, 1993.

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Orbital Forcing Timescales & Cyclostratigraphy. (Geological Society Special Publication Ser. No 85.). Geological Society Publishing House, 1995.

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Ellam, Rob. 7. Reconstructing the past and weathering the future. Oxford University Press, 2016. http://dx.doi.org/10.1093/actrade/9780198723622.003.0007.

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Tiny microfossils called Foraminifera form calcium carbonate shells that record the δ18O composition of the seawater in which they grew. These microfossils are found in sea bed sediment cores, and a lot of information from these oxygen isotope records can be extracted. ‘Reconstructing the past and weathering the future’ looks at the methodology used in palaeoclimate studies and explains gain and phase modelling and Milankovitch orbital cycles. Similar isotope temperature records have been constructed from polar ice cores. Atmospheric CO2 composition can be reconstructed from the amount of CO2 dissolved in the ice. A new sub-discipline of clumped isotope geochemistry—‘isotomics’—will have applications far beyond carbonate palaeothermometry.

Devonian events and biostratigraphy of south China: Conodont zonation and correlation, bio-event and chemo-event, Milankovitch cycle and nickel-episode. Beijing: Peking University Press, 1994.

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Capitoli di libri sul tema "Milankovich cycles":

Schwarzacher, W. "Milankovitch Cycles and Sequences: Two Different Stratigraphic Tools". In Computerized Modeling of Sedimentary Systems, 247–61. Berlin, Heidelberg: Springer Berlin Heidelberg, 1999. http://dx.doi.org/10.1007/978-3-662-03902-1_12.

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Spiegel, David S., Sean N. Raymond, Courtney D. Dressing, Caleb A. Scharf e Jonathan L. Mitchell. "Exaggerated Milankovitch-Like Eccentricity Cycles and Extreme Exoplanet Climate Variation". In Climate Change, 141–45. Vienna: Springer Vienna, 2012. http://dx.doi.org/10.1007/978-3-7091-0973-1_10.

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Yang, C. S., e Y. A. Baumfalk. "Milankovitch Cyclicity in the Upper Rotliegend Group of The Netherlands Offshore". In Orbital Forcing and Cyclic Sequences, 47–61. Oxford, UK: Blackwell Publishing Ltd., 2009. http://dx.doi.org/10.1002/9781444304039.ch5.

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Boyd, R., Z. Huang e S. O'Connell. "Milankovitch Cyclicity in Late Cretaceous Sediments from Exmouth Plateau off Northwest Australia". In Orbital Forcing and Cyclic Sequences, 145–66. Oxford, UK: Blackwell Publishing Ltd., 2009. http://dx.doi.org/10.1002/9781444304039.ch13.

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Claps, M., e D. Masetti. "Milankovitch Periodicities Recorded in Cretaceous Deep-Sea Sequences from the Southern Alps (Northern Italy)". In Orbital Forcing and Cyclic Sequences, 99–107. Oxford, UK: Blackwell Publishing Ltd., 2009. http://dx.doi.org/10.1002/9781444304039.ch9.

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Goldhammer, R. K., E. J. Oswald e P. A. Dunn. "High-Frequency, Glacio-Eustatic Cyclicity in the Middle Pennsylvanian of the Paradox Basin: An Evaluation of Milankovitch Forcing". In Orbital Forcing and Cyclic Sequences, 243–83. Oxford, UK: Blackwell Publishing Ltd., 2009. http://dx.doi.org/10.1002/9781444304039.ch18.

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Strasser, A. "Milankovitch Cyclicity and High-Resolution Sequence Stratigraphy in Lagoonal-Peritidal Carbonates (Upper Tithonian-Lower Berriasian, French Jura Mountains)". In Orbital Forcing and Cyclic Sequences, 285–301. Oxford, UK: Blackwell Publishing Ltd., 2009. http://dx.doi.org/10.1002/9781444304039.ch19.

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"MILANKOVICH CYCLES". In The Complete Guide to Climate Change, 287–89. Routledge, 2008. http://dx.doi.org/10.4324/9780203888469-48.

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Allen, Leon Hartwell, e Jeffreys Amthor. "Plant Physiological Responses to Elevated CO2, Temperature, Air Pollution, and UV-8 Radiation". In Biotic Feedbacks in the Global Climatic System, 51–84. Oxford University PressNew York, NY, 1995. http://dx.doi.org/10.1093/oso/9780195086409.003.0004.

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Abstract Measurements of the CO2 and CH4 content of entrapped gas bubbles in the Vostok Core show a clear correspondence with deuterium content-derived temperatures (Lorius et al. 1990). It has not, however, been established whether changes in these two greenhouse gases have been the primary drivers of the global climatic cycles that have occurred over the last 160,000 years of ice core records. The Milankovich orbital variations of the earth appear to be primary factors in governing global climates (Lorius et al. 1990). Recent analyses of the effects of frequency variations of the orbital obliquity of the earth, superimposed on records of the eccentricity of its orbit, indicate that the frequency variations may induce climatic changes by modulating the seasonal distribution of solar radiation (Liu 1992).

"Milankovitch Cycle(s)". In Environmental Biology, 25–27. Science Publishers, 2009. http://dx.doi.org/10.1201/b10187-6.

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Atti di convegni sul tema "Milankovich cycles":

Jovanovic, Gordana. "Milankovitch cycles, eighty years later". In 11th International Conference of the Balkan Physical Union. Trieste, Italy: Sissa Medialab, 2023. http://dx.doi.org/10.22323/1.427.0044.

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Gustovich, Kristina, Edward Geary e Daniel Hanley. "GENDER AND SPATIAL REASONING: THE MILANKOVITCH CYCLES". In GSA Annual Meeting in Denver, Colorado, USA - 2016. Geological Society of America, 2016. http://dx.doi.org/10.1130/abs/2016am-283914.

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Drake, Lee. "PREDICTING INTERGLACIAL TRANSITIONS WITH MACHINE LEARNING AND THE MILANKOVITCH CYCLES". In GSA Connects 2022 meeting in Denver, Colorado. Geological Society of America, 2022. http://dx.doi.org/10.1130/abs/2022am-381096.

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Поморцев, О., O. Pomorcev, А. Поморцева e A. Pomorceva. "Absolute Chronology of Pleistocene Transgressive Cycles and Their Position on M. Milankovitch Scale". In XXVII International Shore Conference "Arctic Coast: The Path to Sustainability". Academus Publishing, 2019. http://dx.doi.org/10.31519/conferencearticle_5cebbb8cd484e8.51604428.

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Parker, Douglas. "CYCLIC SEDIMENTATION PATTERNS CAN RESULT FROM CYCLIC INCREASES IN VOLCANICLASTIC INPUT DRIVEN BY CHANGES IN THE ORIENTATION OF THE GRAVITATIONAL PULL ON THE EARTH (MILANKOVITCH CYCLES)". In GSA Connects 2023 Meeting in Pittsburgh, Pennsylvania. Geological Society of America, 2023. http://dx.doi.org/10.1130/abs/2023am-391913.

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Larsen, Kristine. "MILANKOVITCH CYCLES AND THE PROPHECY OF ITHLINNE: CLIMATE CHANGE DENIAL IN THE FICTIONAL WORLD OF ANDRZEJ SAPKOWSKI’S WITCHER SERIES". In Northeastern Section-56th Annual Meeting-2021. Geological Society of America, 2021. http://dx.doi.org/10.1130/abs/2021ne-361502.

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Ying*, Guo. "Application of Milankovitch Cycle Analysis to Achieve High Definition Erosional Map From Yubei Area of Tarim Basin, China". 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/ice2015-2209872.

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Wehner, Matthew, e Jacob Grosskopf. "ANTONIO CREEK SECTION MILANKOVITCH CYCLE DETECTION AND OAE 2 CORRELATION TO OTHER LOCATIONS IN THE WESTERN INTERIOR SEAWAY DESPITE HIATUSES". In 51st Annual GSA South-Central Section Meeting - 2017. Geological Society of America, 2017. http://dx.doi.org/10.1130/abs/2017sc-289337.

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Grippo, Alessandro, Linda A. Hinnov e Linda A. Hinnov. "GRAND MILANKOVITCH CYCLES RECORDED IN THE CRETACEOUS (ALBIAN) FUCOID MARLS, PIOBBICO CORE, ITALY, AND IMPLICATIONS FOR THE CHAOTIC EVOLUTION OF THE SOLAR SYSTEM". In GSA Annual Meeting in Phoenix, Arizona, USA - 2019. Geological Society of America, 2019. http://dx.doi.org/10.1130/abs/2019am-336139.

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Gou, Patrick, Raja Azlan Raja Ismail, Florence Yuen, Nadia Zulkifli, Randy Peter Hee, Paul van der Vegt, Benard Ralphie e Fazideen Hassan. "Deciphering the Record of the Sun-Earth Dance in Well Logs: The Extra-Terrestrial Imprint and its Application to High-Resolution Stratigraphy and Well Correlation in South Furious Field, Offshore North Sabah". In Offshore Technology Conference Asia. OTC, 2022. http://dx.doi.org/10.4043/31567-ms.

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Abstract (sommario):

Abstract South Furious is an oilfield in the Inboard Belt offshore North Sabah with oil production since 1979. The field is heavily faulted and compartmentalized, making it structurally complex and challenging for development. It is believed that the field has a low recovery factor, despite having a relatively large oil in-place volume reported. Its highly-heterogenous Stage IVA reservoir with thin sand-shale intercalations, and poor seismic imaging quality make stratigraphic interpretation and well correlations highly uncertain. Recognizing the limitations of conventional methods for well correlation in South Furious, SEA Hibiscus decided to take a quantitative approach on the existing well logs itself, particularly the gamma ray (GR) curve. This data-driven approach is a shift from the unsuccessful model-based method. Cyclostratigraphic analysis using CycloLog works on the principle that extra-terrestrial forces described by the Milankovitch Cycles have a huge influence on sedimentation processes, and its record are preserved in the well logs that we acquire while drilling, although not always obvious without the proper quantitative approach. This high-resolution stratigraphic method allows the detection of cyclic signals in facies-sensitive wireline logs (e.g., gamma ray), including subtle ones, and at resolutions that are equivalent to 4th to 6th Order stratigraphic cycles. Utilizing the Integrated Prediction Error Filter Analysis (INPEFA), geological breaks or events are quantitatively and objectively identified. Cyclostratigraphic and climate stratigraphy concepts as described by Perlmutter and Matthews (1990) and Nio (2005) form the basis of this analysis, which is an evolution of traditional sequence stratigraphic concepts. Results from the 10 pilot wells in South Furious show dramatic improvements in the stratigraphic correlation resolution, particularly in the deeper/older sections, allowing correlations to be made across different fault block segments, previously nearly impossible. With the ongoing inclusion of more wells to the cyclostratigraphic study and future plans to integrate independent chemostratigraphic data, a more robust stratigraphic framework for the field would be established. Results from the current study prove that the cyclostratigraphic method allows objective, quantitative and data-driven stratigraphic well correlations to be made from a systematic and quantitative review of existing well logs, without additional rock sampling or measurement, and in a cost-effective manner. Geoscientists should always be receptive to new ways of working, including utilizing data and techniques that have origins outside mainstream geoscience.