Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 19 of 19 for “"icehouse"”.
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The Upper Mississippian Bluefield Formation in the Central Appalachian Basin: a Hierarchical Sequence Stratigraphic Record of a Greenhouse to Icehouse Transition
… a hierarchy of greenhouse-type 5th order, and icehouse-type 4th order eustatic changes superimposed on differential subsidence. Due to early Alleghenian thrust loading, the depocenter experienced greater total accommodation, which prevented incision during lowstands. Instead, in the depocenter, …
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Sequence Development on a Sediment-Starved, Low Accommodation Epeiric Carbonate Ramp: Silurian Wabash Platform, USA Mid-continent During Icehouse to Greenhouse Transition
… platform during the transition from Ordovician icehouse to Devonian greenhouse. The Wabash Platform (approximately 200,000 square km area) is bounded to the north by the Michigan Basin, to the east by the Appalachian Basin, and passed to the southwest into the Vincennes Basin, which was open to …
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Orbital-scale fluctuations in continental weathering flux and continental ice-volume during greenhouse and icehouse climate intervals : evidence from oxygen and neodymium isotopes
… µNd and δ18O values from Middle Pennsylvanian icehouse cycles (Chapter 2). Observed conodont δ18O trends support previous interpretations that sampled cycles were generated by glacio-eustasy (30-50 m magnitudes) combined with <1° sea surface temperature changes. µNd trends typically demonstrate …
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Chemostratigraphic correlation and Pb-Pb dating of carbonate sequences in the external Gariep belt and Kango inlier of the Saldania belt in Namibia and South Africa
… indicating possibly rapid climatic changes from icehouse to greenhouse conditions. Such sequences also occur in the Pan-African Gariep Belt and in the Kango inlier of the Saldania Belt in Namibia and South Africa. Correlation of these sequences with others has been problematic because of poor age …
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Integrated geological and petrophysical investigation on carbonate rocks of the middle early to late early Canyon high frequency sequence in the Northern Platform area of the SACROC Unit
… platform style of reservoir that typifies a peak icehouse system. Icehouse carbonate platforms are one of the least well understood and documented carbonate reservoir styles due to the reservoir heterogeneities they embody. The current study is an attempt to recognize carbonate rock types defined …
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Cyclostratigraphy and sequence stratigraphy of the Solent Group (Eocene-Oligocene) of the Isle of Wight, UK
… when the change from a greenhouse world to an icehouse world took place. This has also allowed uncertainty surrounding the location of the Eocene-Oligocene boundary within the Solent Group to be cleared up. A major incision event associated with glacial build up at the Eocene-Oligocene boundary …
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A stable isotope stratigraphy for the Axel Heiberg Fossil Forest and its application to Eocene climate
… the Paleocene greenhouse world and the Oligocene icehouse world. This study details carbon and hydrogen isotopic and biomarker analyses of samples of lignite (bulk fossil leaves), wood, paleosol, and resinite from the Middle to Late Eocene age fossil forest stratigraphy on Axel Heiberg Island, …
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Paleogene-Early Neogene palynomorphs from the Eastern Equatorial Atlantic and Southeastern Florida, USA: Biostratigraphy and paleoenvironmental implications
… (Paleocene-Eocene Thermal Maximum, PETM) to icehouse conditions (Early Oligocene) is not well documented in tropical-subtropical regions. One hundred and five samples from Ocean Drilling Program (ODP) Site 959 (Hole 959A and Hole 959D) in the Cote d'Ivoire-Ghana Transform Margin, Alo-1 Well …
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Origin and stratigraphic architecture of the Middle Permian lower and upper Quanzijie low-order cycles, Bogda Mountains, NW China
… to humid-subhumid as a result of the global icehouse to hothouse transition. Finally, the fluvial conglomerates and sandstones in the lower and upper QZJ LCs are interpreted as being derived from the northern Tian Shan volcanic arc to the south and from local rift shoulders. This study …
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Climatic and tectonic controls on deep water sedimentary cyclicity : evidence from the Miocene to Pleistocene of Cyprus
… warmth of the early-Miocene to the Neogene 'icehouse world'. Cyprus has extensive outcrops of Miocene to Pleistocene deep water sediments and provides an ideal setting to test the magnitude of climatic signals in tectonically active areas, and thus deduce the relative roles of climate and …
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High-Resolution Sequence Stratigraphy of Late Mississippian (Chesterian) Mixed Carbonates and Siliciclastics, Illinois Basin
… during the Late Mississippian greenhouse to icehouse transition. Detailed, lithologic cross-sections were constructed through the Chesterian Ste. Genevieve through Glen Dean interval which show an upward change in character from carbonate-dominated sequences bounded by caliche and breccia …
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THE CLIMATIC, BIOTIC AND TECTONIC EVOLUTION OF THE PALEOGENE RENOVA FORMATION OF SOUTHWESTERN MONTANA
… greenhouse climate and the establishment of icehouse conditions across the Earth. These changes led to profound alterations in both marine and terrestrial ecosystems. This study examines the late Eocene/early Oligocene history of the northern Rocky Mountains by means of an integrated study of …
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THE CLIMATIC, BIOTIC AND TECTONIC EVOLUTION OF THE PALEOGENE RENOVA FORMATION OF SOUTHWESTERN MONTANA
… greenhouse climate and the establishment of icehouse conditions across the Earth. These changes led to profound alterations in both marine and terrestrial ecosystems. This study examines the late Eocene/early Oligocene history of the northern Rocky Mountains by means of an integrated study of …
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Deep-marine depositional systems of the western North Atlantic: Insights into climate and passive-margin evolution
… (EOT), the most recent global greenhouse-to-icehouse transition. Results suggest that the Deep Western Boundary Current intensified gradually from 35-26 Ma, not abruptly at the EOT, and change consistent with deepening of the Greenland-Scotland Ridge and enhanced overflow of deep water into …
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The Lower Pennsylvanian New River Formation: a Nonmarine Record of Glacioeustasy in a Foreland Basin
… time period was characterized by global icehouse conditions and the tectonic assembly of Pangea. These events affected the geometry of the overall stratigraphic package, which can be attributed to high-magnitude, high-frequency, glacioeustatic sea-level fluctuations superimposed on …
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Middle Miocene carbon cycle dynamics: A multi-proxy approach
… from the “greenhouse” of the Cretaceous to the “icehouse” of the present day. Accompanying the middle Miocene growth of the Antarctic Ice Sheet are major perturbations in the global carbon system, represented by some of the largest fluctuations in marine carbonate δ<sup>13</sup>C values in the …
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Rates and dates: Evaluating rhythmicity and cyclicity in sedimentary and biomineral records
… as those that occur when the planet is in an icehouse condition, are necessary to produce recognizable and preservable patterns that are otherwise overwhelmed by other depositional factors. The second project examines the temporal distribution of the bivalve Semele casali from Ubatuba Bay, …
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The sedimentology and stratigraphy of Salt Creek Field, Kent County, Texas
The Horseshoe Atoll is one of the largest hydrocarbon accumulations in the Permian Basin, with a cumulative production of more than 2.7 Bbbl since 1948. This atoll is contemporaneous with the Late Paleozoic Ice Age (LPIA), perhaps the best-known Phanerozoic phase of glaciation after the …
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BIOMINERALIZATION AND GLOBAL CHANGE: BIOTIC RESPONSE TO THE GONDWANAN GLACIATION AND SUBSEQUENT CLIMATE WARMING
… this time-interval witnessed the transition to icehouse conditions in the late Visean, with the onset of the Late Palaeozoic Ice Age, one of the major glacial events occurred in the Phanerozoic. By the Sakmarian (Early Permian) this long and dynamic glacial phase came to an end, and Earth’s …