Global ETD Search
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Showing 1 to 17 of 17 for “"paleohydrology"”.
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Stable Isotope Geochemistry and Paleohydrology of the Poison Strip Sandstone, Early Cretaceous, Eastern Utah
The Poison Strip Sandstone Member is a unique unit in the early Cretaceous Cedar Mountain Formation of eastern Utah. A previous chemostratigraphic study of the Poison Strip Sandstone at the Ruby Ranch Road (RRR) section east of Green River, Utah produced a noteworthy dataset with interesting δ18O …
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Deep-lake carbonates and speleothems as high-resolution archives of paleohydrology in the Bonneville Basin, UT
Precisely dated terrestrial paleoclimate records are indispensable for understanding how different regions respond to global-scale climate variability. Here, we focus on developing precisely dated records from the Bonneville Basin, a large basin in the eastern U.S. Great Basin. This region is known …
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Biogeochemistry and inorganic geochemistry as indicators of the paleoenvironment and paleohydrology of the Al-Azraq Basin, Jordan
… geochemical indicators for past environments and paleohydrology of a high resolution sediment record from the Al-Azraq Basin, Jordan. The second largest basin in Jordan, it is an important aquifer for a majority of the population in this arid region. Thirteen hundred samples were collected from …
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Heterogeneity, paleohydrology, and 3D facies architecture of ancient point bars, Ferron Sandstone, Notom Delta, South-central Utah
This study examined ancient exhumed channel belts from the Cretaceous Ferron Sandstone, Notom Delta in south-central Utah. Extensive plan view exposures with local vertical cliff exposures allowed documentation of channel belt dimension, migration pattern (translation versus expansion) and facies …
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Travertine from Egypt's Western Desert: a terrestrial record of North African paleohydrology and paleoclimate during the late Pleistocene
… a promising terrestrial proxy for North African paleohydrology. Integrating our reconnaissance sampling of travertine and modern groundwaters from five important oasis areas with data from previously published studies, we combine high-precision U/Th dating, geologic characterization, and stable …
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Stable isotope paleohydrology of pedogenic carbonates in the Wayan Formation (Albian) from the wedge-top depozone in the North American Cretaceous Western Interior Basin
Determining the presence and effects of orogenic rain shadows on paleoclimate is challenging, but critical to understanding overall moisture and heat transport. This thesis presents new data and interpretation for the climate system of the Cretaceous greenhouse world, which is a major keystone in …
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Syntectonic deposition and paleohydrology of the spring-fed Hualapai Limestone and implications for 5-6 MA integration of the Colorado River system through Grand Canyon : evidence from sedimentology, geochemistry and detrital zircon analysis
The Hualapai Limestone, at the western edge of the Colorado Plateau, provides the best sedimentary record available for 12 to 6 Ma at the mouth of the Grand Canyon. Because it directly underlies the first Colorado River gravels, this unit is a key element for understanding the integration of the …
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Past And Present Hydrogeology Of The Atacama Desert, Northern Chile: Human And Natural System Interactions
… 2 is a study of the landscape evolution and paleohydrology of the northern portion of the Chilean forearc basin. During the Late Miocene and Early Pliocene, before the forearc basin was deeply incised, a lake existed in the western part of the forearc basin. New 40Ar/39Ar ages of volcanic …
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Paleoenvironment reconstruction in extreme climates using organic geochemical investigations
… signals as rocks from the same time and that the paleohydrology was far different from present day. Finally, a study was conducted of the recent history of Lagunas Miscanti and Miñiques due to their location at high elevations in the dry Chilean Altiplano. Examination of biomarker distribution as …
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How Climate Change Could Affect The Water Supply of Potash of Potash Solution Mining in Southern Saskatchewan
… a drought longer than one or two years, but the paleohydrology from tree-rings reveals that droughts within the region can last for a decade or longer. This research was conducted to examine how climate change could affect the water supply of solution potash mining in southern Saskatchewan. The …
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Depositional constraints on lacustrine carbonates from the Winnemucca Dry Lake Basin, Nevada, USA
… show that understanding the paleotopography and paleohydrology of the basin, which are commonly controlled by basin structure, are the most significant factors for predicting tufa distributions at the basin scale. However, for paleoenvironmental proxy analysis, it is critical to untangle the …
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Hydrogen isotope fractionation in ammonia-oxidizing archaea
In recent years, the potential of the hydrogen stable isotope composition (δ2H) signature of isoprenoid glycerol dibiphytanyl glycerol tetraether (GDGT) membrane lipids of ammonia-oxidizing archaea (class Nitrososphaeria) as a novel palaeohydrological proxy has gained increasing attention. This PhD …
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Detailed paleoclimatic records from late Pennsylvanian polygenetic paleosols : north-central Texas, USA.
Two Canyon Group (late-Pennsylvanian, Missourian) multistory, polygenetic paleosol intervals in north-central Texas, USA record complex paleoclimatic and paleohydrologic histories. Both paleosol intervals show evidence for initial development under well-drained conditions (illuviated clay, …
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A Reconstruction of Precipitation and Hydrologic Variability on the Peruvian and Bolivian Altiplano During the Late Quaternary
… methods to create a refined reconstruction of paleohydrology, as well as paleoclimate, on the Altiplano. A major goal of this research is a more detailed understanding of millennial scale climate variability as it relates to insolation changes and abrupt warming and cooling in the north …
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Understanding links between flow regime and fish populations in the Saskatchewan River Delta
Successful spawning and survival to adulthood (i.e., recruitment) are essential to maintain sustainable fish populations. Abiotic environmental conditions can influence recruitment and the resulting ability to harvest adult fish. In rivers, the flow regime dictates water depths and velocities that …
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Soft-sediment Deformation and Dune Collapse in the Navajo Sandstone
<p>The Canyon Overlook Trail of Zion National Park follows an outcrop of Navajo Sandstone, which displays a uniquely well-exposed assemblage of features associated with failure of the lee face of a large eolian dune, and run-out over an expanse of interdune sediments downwind of that bedform. …