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Showing 1 to 20 of 209 for “"Paleo"”.
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The formation history of Olympus Mons from paleo-topography
… to constrain the bulk formation period using paleo-topographic evidence. On the northeastern edge of the flexural trough, we located a lava flow whose path is radically discordant with current down-slope directions, indicating entrenchment prior to large-scale flexural trough formation. To …
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Methane cold seeps: Paleo proxies, modern measurements, and instrument development
Marine cold seeps are one of the main conduits by which methane (CH4) from anoxic marine sediments, the largest CH4 reservoir on Earth’s surface, is transferred from the sediments into the ocean. Most of this CH4 is oxidized by microbes in the sediments, making the anaerobic oxidation of CH4 (AOM) …
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Development of biomarker-based proxies for paleo sea-ice reconstructions
… previously been proposed as a proxy measure of paleo sea-ice extent. However, the use of such biomarker proxies remains under development. In the current study, a number of additional palaeoceanographic developments of HBIs as sea-ice biomarkers in both polar regions has been undertaken. For the …
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Subsurface Paleo-Stream Reach Reconstruction and Classification Using Seismic Data Interpretation
… classification, this study was able to identify paleo-stream reaches in the Frio Formation within the Stratton 3D seismic data set. Hydraulic geometry variables from Rosgen's classification scheme were used to classify paleo-stream reaches shown in the seismic data. Estimated paleo-discharges …
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Paleo-astronomy: investigations of terrestrial 60Fe forged in near-Earth supernovae
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2023-04-12 without embargo terms
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Tectonic-erosion interactions : insights from the paleo-drainage of the Brahmaputra River
… in the eastern Himalaya through the study of paleo-Brahmaputra deposits in the foreland basin. Sediment depositional dating of two sedimentary sections is performed using magnetostratigraphy, apatite fission-track and luminescence dating. Provenance analysis using zircon and apatite U-Pb …
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Paleo-aridity records investigated through drip water chemistry in Lehman Caves, Nevada
… the future climate of the region uncertain. The paleoclimate record has direct examples of dramatic changes in water availability in this area, allowing for a comparison of precipitation changes and responses for the Great Basin. In Lehman Cave, Nevada, ten drips above actively-forming …
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INVESTIGATING THE ORIGINS OF UHECRS USING THE PIERRE AUGER OBSERVATORY AND PALEO-DETECTORS
… the possibility of using ancient minerals as paleo-detectors to study the history of the flux of cosmic rays in the past by detecting the tracks left in the mineral structure by the interactions between ions and energetic secondary cosmic rays present in the extensive airshowers.
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Paleo-Ecotoxicology of Yellowknife (Northwest Territories, Canada) Lakes Impacted by Historic Gold Mining Activities
… lakes (Northwest Territories, Canada) using a paleo-ecotoxicological approach. I examined Cladocera subfossils preserved in the modern and pre-1850 lake sediments of 23 lakes in the region, and the Daphnia resting egg bank of Pocket Lake, a highly contaminated lake in which striking ecological …
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Nutritional adequacy comparison of Paleo and healthy U.S. dietary patterns followed by athletic adults
<p>The Paleo diet has become popular for promoting good health, but there is little available research on its nutritional adequacy or its long-term effects. The present literature review explores the strengths and limitations of the research on health-related outcomes and nutritional adequacy …
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What do paleo-geochemical tracers tell us about the deep ocean circulation during the last ice age?
Paleo-tracers such as carbon 13 and cadmium show that the deep Atlantic was enriched in nutrients during the Last Ice Age. The conventionally accepted interpretation of these higher nutrient levels is that a reduction of the rate of formation of nutrient-depleted Lower North Atlantic Deep Water …
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Topographic evolution of the East African Plateau : a combined study on lava-flow modeling and paleo-topography
… Athi River, which is mimicking the course of the paleo-river. My approach is a lava-flow modeling, based on an improved composition and temperature dependent method to parameterize the flow of an arbitrary lava in a rectangular-shaped channel. The essential growth pattern is described by a …
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Reconstructing the depositional history of the Eel River paleo meltwater channel, northeastern Indiana using sediment provenance techniques
The outwash deposits of the Eel River paleo meltwater channel in DeKalb and Allen Counties, Indiana predominantly originated from the Erie Lobe of the Laurentide Ice Sheet, but do contain some sediment from the Saginaw Lobe. This determination helps clarify the ice dynamics and Last Glacial Maximum …
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What do paleo-geochemical tracers tell us about the deep ocean circulation during the last ice age?
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 1995.
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Regional Paleo-Environmental Study of Some Middle Pennsylvanian Strata Ofthe Midcontinent Region and Textural Analysis of Included Limestones
Made available in DSpace on 2014-12-09T20:34:14Z (GMT). No. of bitstreams: 1 6503651.pdf: 9676239 bytes, checksum: 6775ccf2f0c34983eeca12459e00c0f2 (MD5) Previous issue date: 1964
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Evaluating redox cycling across the Toarcian Oceanic Anoxic Event with implications for paleo-environmental reconstructions and organic matter sulfurization
Understanding oxygenation throughout Earth history, particularly intervals where marine deoxygenation occurred, are crucial to investigating the changes in habitability on Earth. Marine deoxygenation events, in particular, can result in changes in the carbon, sulfur, and iron cycles on our planet. …
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Paleo-environmental conditions and tectonic settings of cretaceous-tertiary kaolins in the Eastern Dahomey and Niger Delta Basins in Nigeria.
… between the two continents with respect to paleoenvironmental conditions and tectonic settings during the Cretaceous- Tertiary periods have been concentrated more on the use of flora and fauna as indicators with less application of kaolinite as paleoenviromental proxies, hence, this study. …
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Cenozoic evolution of the Pamir Salient; timing, mechanisms and paleo-environmental impacts : constraints from the Aertashi section, western Tarim Basin
The formation of the Himalayas and surrounding mountain ranges is one of the most significant tectonic events of the Cenozoic, with far reaching impacts on both regional and global climate. The Pamir represents the indented westward continuation of the northern margin of the Tibetan Plateau making …
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Geochemical and Paleontological investigations of the Neoproterozoic-Cambrian Transition: Case Studies on geochemical clast provenance, emerging paleo redox proxies, and ambiguous dubiofossils
The transition from the Neoproterozoic to the early Cambrian world was a critical time in the co-evolution of life and the environment, when dramatic changes in the environment, including global glaciations and rising atmospheric oxygen levels precipitated the conditions in which variety of complex …
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Microstructural, geochronologic and thermochronologic evidence for both Paleo- and Mesoproterozoic displacement across the Gneiss Canyon shear zone : lower Granite Gorge, Grand Canyon, Arizona
The Gneiss Canyon shear zone (GCSZ) in north-western Arizona sits between high grade migmatites on the west and lower amphibolite grade schists on the east. This 13 km-wide zone, contains domains of intense D2 strain up to 100m wide that separate blocks of preserved northwest-striking D1 fabric. …
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