Дисертації з теми "Icehouse"
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van, Mourik Caroline A. "The Greenhouse - Icehouse Transition : a dinoflagellate perspective." Doctoral thesis, Stockholm University, Department of Geology and Geochemistry, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-1073.
Повний текст джерелаThrough the analysis of the stratigraphic and spatial distribution of organic walled dinoflagellate cysts (dinocysts) from climatologically and oceanographically key sites, this project aims to contribute to a better understanding of the Eocene-Oligocene (E/O) environmental changes and their timing. A central issue is to identify the global environmental changes which are responsible for the Eocene cooling and its underlying mechanisms with the focus on the Oligocene isotope-1 (Oi-1) event, thought to mark the onset of major Antarctic glaciation.
Two low-latitude sites were selected, Blake Nose (western North Atlantic) and Massignano (central Italy). For the first time a coherent taxonomy and biostratigraphy of dinocysts was established for the late Eocene at these latitudes. A high resolution correlation was established between the Massignano E/O Stratotype Section and the stratigraphically more extended ‘Massicore’. The composite section was used to analyse sea surface temperature (SST) change across the greenhouse-icehouse transition by means of dinocyst distribution.
At Massignano, the Oi-1 event was recognised both qualitatively and quantitatively. In the power spectrum of the SSTdino the ~100 and ~400 kyr eccentricity cycles may be distinguished and correlated with La04. When orbitally tuned, the E/O GSSP dates ~100 kyr older than the Oi-1 event. The boundary’s age could either be ~33.75 or ~34.1 Ma, both differ significantly from the ~33.9 Ma age in the GTS 2004.
Furthermore, when the data from the low-latitude sites were combined with extensive datasets from the Proto North Atlantic and adjacent regions, a suite of species sensitive to changes in SST was recognised. Their first and last occurrences reflect seven distinct phases of decreasing SSTs during the Middle Eocene to earliest Oligocene.
These results clearly indicate that atmospheric cooling together with higher frequency orbital forcing played a key role in the transition from the Greenhouse to the Icehouse world.
Van, Mourik Caroline A. "The greenhouse - icehouse transition : a dinoflagellate perspective /." Stockholm : Department of Geology and Geochemistry, Stockholm University, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-1073.
Повний текст джерелаForsythe, G. T. W. "Construction and ecology of icehouse algal reefs." Thesis, University of Cambridge, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.599129.
Повний текст джерелаPaterson, Richard James. "Carbonate diagenesis and sedimentology in an icehouse world." Thesis, University of Bristol, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.492466.
Повний текст джерелаSpringate, Megan Elizabeth. "Keeping it cool, investigations around the Benares icehouse, Mississauga, Ontario." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/mq21703.pdf.
Повний текст джерелаCanile, Fernanda Maciel. "Evidências geológicas de mudanças climáticas (greenhouse-icehouse) na Antártica Ocidental durante a passagem Eoceno-Oligoceno." Universidade de São Paulo, 2010. http://www.teses.usp.br/teses/disponiveis/44/44141/tde-08012011-203025/.
Повний текст джерелаDuring the Eocene and Oligocene (55 23 Ma) the Earth was undergoing a period of great climatic changes. Geological records, reinforced by climate models indicate that global climate during this period went from a stage in which the Earth was virtually free of polar ice caps to a stage close to what we find today in Antarctica. Most of these records are indirect, taken from the deep-sea cores or fossil material. Clear terrestrial evidence of climate change (greenhouse-icehouse) for the Eocene-Oligocene transition is found in Wesele Cove, King George Island, West Antarctica. This evidence includes a succession of at least thirteen, few meters thick, basaltic lava flows overlain disconformably by diamictite and sandstone. The basaltic section is correlated with the Mazurek Point/Hennequin Formation, radiometric dated as Eocene, and the diamictite and sandstone correspond to the Krakowiak Glacier Member of the Polonez Cove Formation, dated as Early Oligocene, on paleontological and radiometric basis. Each tholeiitic basalt layer exhibits a lower, thicker (1 to few meters) fresh zone, transitionally followed up by a zone of saprolith, varying from decimeters to 1-1.5 m in thickness. The entire basalt package of around 60 m, is tilted 25º to the east. The succession has been recently exposed due to fast retreat of the present Wyspianski Glacier. The initial field evidence suggests that the succession represents the geological record of paleoclimatic variation from mild to glacial conditions, that could correlate with the change from the late Eocene optimum climatic (greenhouse) to icehouse conditions in the Oligocene, as recorded on the Cenozoic paleotemperature curve established by 18O determinations on calcareous foram tests. This study had focus on the stratigraphy and geochemistry analysis of the occurrence, in order to interpret the succession of palaeoclimatic events documented in outcrop and analyze them in the context of paleoclimatic history of Antarctica. Data obtained consistently showed that the supposed transition from unaltered to altered zones observed in each basalt layer may in fact be assigned to the moderated action of weathering processes on top of each flow. They also demonstrate a glacial, in partly subglacial with marine contribution, origin for the overlying diamictites, which has features such clasts of diverse lithologies and sizes, faceted and striated clasts, bullet shaped clasts, clasts broken by freezing and thaw, intraformational striae and marine fossils found in the matrix of the diamictite. The mild paleoclimatic conditions responsible for weathering of the basalt lasted until the emplacement of the highest lava horizon, followed by tectonic movement that tilted the package. These events indicate a relatively long paleoclimatic mild conditions during the Eocene, preceding the establishment and displacement of the Oligocene ice-sheet in this part of Antarctica.
Via, Rachael Kathleen. "Evolution of Atlantic deep-water circulation: from the greenhouse to the icehouse." Texas A&M University, 2005. http://hdl.handle.net/1969.1/2609.
Повний текст джерелаKeech, Andrew R. "Chemical weathering in an icehouse world : the record from soils and lakes." Thesis, University of Bristol, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.556963.
Повний текст джерелаNewsam, C. "Calcareous nannoplankton evolution and the Paleogene greenhouse to icehouse climate-mode transition." Thesis, University College London (University of London), 2017. http://discovery.ucl.ac.uk/1541282/.
Повний текст джерелаTremblin, Maxime. "Contraindre la transition greenhouse-icehouse du Paléogène par la géochimie des coccolithes." Electronic Thesis or Diss., Sorbonne université, 2018. https://accesdistant.sorbonne-universite.fr/login?url=https://theses-intra.sorbonne-universite.fr/2018SORUS450.pdf.
Повний текст джерелаAmong the major obstacles in constraining paleoclimates for periods of “greenhouse” type is the poor preservation state of the sedimentary archive, and the existence of limits for each of the different applied geochemical markers. These obstacles lead to great uncertainties on the values and distribution of sea surface temperatures (SSTs) and atmospheric CO2 concentrations. Therefore, the mechanisms that brought the Earth’s system from a “greenhouse” to an “icehouse” regime throughout the Paleogene are not well constrained. In this thesis, we reconstructed the thermal evolution of the superficial ocean and the evolution of atmospheric pCO2 during the Paleogene from the isotopic signal (δ18O and ∆13C) of the fossilized carbonate exoskeleton of coccolithophores: coccoliths. Our data reveal a global cooling of surface waters from the Early to the Middle Eocene. During the Late Eocene and across the Eocene-Oligocene transition, values for pCO2 decrease, and cooling at high latitudes continues, allowing for the set up of an ice sheet in Antarctic, while the tropical belt warms. This change in the distribution of heat fluxes at the Earth’s surface during this period is synchronous to the deepening of the Drake Passage and to the set up of a vigorous Antarctic Circumpolar Current. These results thus highlight the driving role of changing oceanic circulations for climate dynamics during this transition. This thesis also proves the existence of important latitudinal thermal gradients throughout the Paleogene. The hypothesis of a homogeneous distribution of SSTs between the Equator and the poles, which prevails in the literature but remains hard to modelise, can thus be rejected
Bell, David Benjamin. "Onset of the Icehouse World : Atlantic deep-water circulation during the Pliocene and Pleistocene." Thesis, University of Edinburgh, 2014. http://hdl.handle.net/1842/16468.
Повний текст джерелаInglis, Gordon Neil. "From Greenhouse to Icehouse : reconstructing temperature change during the Eocene using a biomarker approach." Thesis, University of Bristol, 2015. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.685351.
Повний текст джерелаRübsam, Wolfgang [Verfasser]. "The Early Toarcian environmental crisis : mechanisms and consequences of an Icehouse-Greenhouse Transition / Wolfgang Rübsam." Kiel : Universitätsbibliothek Kiel, 2019. http://d-nb.info/118548518X/34.
Повний текст джерелаYoung, Seth Allen. "A chemostratigraphic investigation of the late Ordovician greenhouse to icehouse transition oceanographic, climatic, and tectonic implications /." Columbus, Ohio : Ohio State University, 2008. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1201628490.
Повний текст джерелаYoung, Seth A. "A chemostratigraphic investigation of the late Ordovician greenhouse to icehouse transition: oceanographic, climatic, and tectonic implications." The Ohio State University, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=osu1201628490.
Повний текст джерелаBohaty, Steven Michael. "Middle Eocene to early Oligocene paleoceanography of the Southern Ocean : critical events in the greenhouse to icehouse transition /." Diss., Digital Dissertations Database. Restricted to UC campuses, 2006. http://uclibs.org/PID/11984.
Повний текст джерелаTierney, Kate Elizabeth. "Carbon and strontium isotope stratigraphy of the Permian from Nevada and China: Implications from an icehouse to greenhouse transition." The Ohio State University, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=osu1269625662.
Повний текст джерелаMaynard, Joel Phillip. "The Upper Mississippian Bluefield Formation in the Central Appalachian Basin: a Hierarchical Sequence Stratigraphic Record of a Greenhouse to Icehouse Transition." Thesis, Virginia Tech, 1999. http://hdl.handle.net/10919/40533.
Повний текст джерелаMaster of Science
Spengler, Alison Elizabeth. "Sequence Development on a Sediment-Starved, Low Accommodation Epeiric Carbonate Ramp: Silurian Wabash Platform, USA Mid-continent During Icehouse to Greenhouse Transition." Thesis, Virginia Tech, 2007. http://hdl.handle.net/10919/44529.
Повний текст джерелаMaster of Science
Debenham, N. "A new model for cold climate source rock preservation in the Arckaringa Basin." Thesis, 2014. http://hdl.handle.net/2440/109976.
Повний текст джерелаThe controls on organic carbon preservation in sediments are poorly understood, however there is a first order association between high total organic carbon concentration (TOC), warm climates and fine grained sediments with mature mineralogy in the geologic record. Permo-Carboniferous marine sediments in the Arckaringa Basin, however, present an exception with anomalous organic carbon concentration (<11% TOC) occurring within mineralogically immature siltstones deposited in deep, narrow (marine) fjords during glacial conditions. Organic matter (OM) is not refractory terrigenous material, but rather hydrogen-rich and labile, thus identifying an active preservational mechanism that differs from conventional organic carbon enrichment controlled by mineral preservation effects. Energy Dispersive Spectrometry (EDS) reveal an association between labile OM and high sulphur concentrations, and EDS mineral mapping identifies a cyclic millimetre alteration between sulphur/OM rich laminae and manganese carbonate (kutnohorite) laminae, identifying oscillating benthic redox conditions similar to annual varves in proglacial environments. Framboidal pyrite (<5 µm) is abundant only within organic-rich laminae, indicating sulphate reduction in euxinic conditions resulting from restricted sea water exchange and the development of strong density stratification. Seisimic profiles indicate that deposition occurred in fjord-shaped troughs, with restriction resulting from end moraines acting as sills to the open ocean. Thus, organic carbon enrichment is attributed to restriction in the ancient fjords, leading to periods of hydrogen sulphide build up within the water column that were annually flushed with seasonal change in temperature and runoff. The reducing conditions of the fjord provided a chemical trap for S leading to its enrichment in organic matter. Similarly, Mn within carbonates was enriched in the same manner. Excess dissolved sulphur build up in the water column and sediments resulted in vulcanization (sulfurization) reactions polymerizing labile organic compounds (lipids and carbohydrates) and their preservation as organosulphur compounds during early diagenesis.
Thesis (B.Sc.(Hons)) -- University of Adelaide, School of Physical Sciences, 2014
Wood, Stephanie Grace. "Lithofacies, depositional environments, and sequence stratigraphy of the Pennsylvanian (Morrowan-Atokan) Marble Falls Formation, Central Texas." 2013. http://hdl.handle.net/2152/21902.
Повний текст джерелаtext
Woodard, Stella C. "Oceanic and atmospheric response to climate change over varying geologic timescales." Thesis, 2011. http://hdl.handle.net/1969.1/ETD-TAMU-2011-05-9279.
Повний текст джерела