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Showing 1 to 20 of 45 for “"alluvial fan"”.
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Morphology and development of the Red Rock Canyon alluvial fan, Clark County, Nevada
… four surfaces identified on the Red Rock Canyon alluvial fan. All surfaces identified are formed of limestone alluvium, occur at elevations of 853 m, and share the same climate and vegetation. These surfaces were mapped and delimited by color, texture, dissection, and soil development and were …
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The sedimentology of coarse grained hyperconcentrated flow deposits within modern and ancient volcaniclastic and alluvial fan sequences
… Saint Helens.The analysis of Permo-Triassic alluvial fan deposits on the Isle of Lewis Scotland, revealed that elements of the debris flow/stream flow depositional continuum could be recognised by the application of the criteria established in the volcaniclastic environment of Mount Saint …
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A Line in the Sand: Archaeological Evidence for the Interactions of Settled Farmers and Mobile Pastoralists in the Late Bronze Age (1950 - 1500 BC) Murghab alluvial fan, Turkmenistan
… Age period (1950 - 1500 BCE) in the Murghab alluvial fan of present-day Turkmenistan. Traditional archaeological and historical studies in Central Asia, focused as they are on urban contexts or centers of dense population, have colored interpretations of mobile-sedentary interaction in …
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REMOTELY MAPPING SURFACE ROUGHNESS ON ALLUVIAL FANS: AN APPROACH FOR UNDERSTANDING DEPOSITIONAL PROCESSES
… and understand depositional processes on active, alluvial fan surfaces in Death Valley, CA. Surface roughness on the scales of grain size and topography on alluvial fan surfaces is expected to vary with depositional processes, including fluvial and mass movement events, as well as surface runoff …
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Indoor atmospheric radon in Hamadan, Iran. Atmospheric radon indoors and around Hamadan city in Iran.
… visitors was very low. Hamadan city is built on alluvial fan deposits which are the source of the local water supply. The data from the wells shows that the groundwater in these alluvial deposits influences the flux of radon. The atmospheric radon concentration measurement in wells above the …
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The sedimentology and diagenesis of copper-bearing rocks of the southern margin of the Damaran Orogenic Belt, Namibia and Botswana
… Kibaran (1,100 ± 200 MYR) ages. They consist of alluvial fan, lacustrine, aeolian, playa and mud flat sediments, deposited in a semi-arid to arid climate. Four types of alluvial fan complex are recognized and divided into two morphological groups: 1) thick conglomeratic fans with rapid lateral …
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Dating of alluvial fans from NW Argentina using cosmogenic nuclides and optically stimulated luminescence technique
Alluvial fans are important geomorphic markers and sedimentary archives of tectonic and climatic changes. Hence, basins providing perfect studying conditions can often be found in arid regions due to the low weathering impact and thus well preservation of sedimentary features. Twelve samples for …
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Περιβάλλοντα αποθέσεως των ιζημάτων του Πηδάσου (Ν.Δ. Πελοπόννησος)
… interbedded with conglomerate and are probably alluvial fan deposits. Overlying is a sei sequence of marine faciès, mostly deposited in a lagoon. Silty sand and clayey silt were probably built up in lagoonal euxinic bottom. Gradedwashover beds were deposited behind barrier beaches. Clayey silt …
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HOLOCENE FIRE-RELATED ALLUVIAL CHRONOLOGY AND GEOMORPHIC IMPLICATIONS IN THE JEMEZ MOUNTAINS, NEW MEXICO
… have varied. This work utilized fire-related alluvial fan deposits to assess fire activity, severity and geomorphic response to fire over millennial timescales. It was found that fire activity in the study area may have been influenced by shifts in climate, such that frequent, low-severity …
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The sedimentology and lithostratigraphy of the Upper Jurassic Lourinha formation, Lusitanian Basin, Portugal
… marine shelf and slope systems were replaced by alluvial fan and fluvial environments which prograded from the nonh during the late Kimmeridgian. Continental environments, periodically punctuated by marine incursions, persisted over northern and central areas of the basin at least until the end …
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Climatic and Geomorphic Interactions on Alluvial Fans in the Atacama Desert, Chile
Alluvial fan surfaces in the Atacama Desert of northern Chile preserve evidence of recent, precipitation-driven, surface flows. Determining the hydrologic characteristics of these flows is important for understanding the effects of rare yet significant storms in the region. Flow reconstruction, …
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Comparison of models to mitigate flood hazard to transportation alignments on alluvial fans
… may provide better discharge estimates for alluvial fan flood mitigation studies than the one-dimensional, stochastic Federal Emergency Management Agency (FEMA) model; A modified version of the one-dimensional, stochastic FEMA model (French, 1992), and the one- and two-dimensional, …
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Hydrogeology and hydrogeochemistry of the Spring Mountains, Clark County, Nevada
… from the Spring Mountain bedrock aquifer and alluvial-fan aquifers are mixing with water from the regional aquifer in the Las Vegas shear zone. Modeling also suggests mixing of 90 percent Las Vegas shear zone water with 10 percent water from the western portion of the Las Vegas Valley in the …
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The stratigraphy and structural evolution of the late Proterozoic Gariep belt in the Sendelingsdrif-Annisfontein area, northwestern Cape Province
… Stinkfontein Sequence was deposited in an alluvial fan environment. Fluviatile conglomerates and quartz arenites (Lekkersing Formation) interfinger with feldspathic arenites and minor volcanics (Vredefontein Formation), and prograde into marginal marine elastics and carbonates (Gumchavib …
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Pedogenesis and geomorphic implications of soils developed on Blue Ridge alluvial fans, Virginia
Alluvial fans along the western footslopes of the Blue Ridge province, Virginia range over a linear distance of at least 200 km and spread westward up to 4.8 km. Certain soils formed on the fans appear old and highly weathered. Little detailed physical, chemical, or mineralogical data is available …
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Basin analysis of Tertiary strata in the Pattani Basin Gulf of Thailand
… units: 1) Late Eoceneto Early Oligocene alluvial fan, braided river and floodplain deposits; 2) Late Oligocene to Early Miocene floodplain and channel deposits; and 3) an Early Miocene regressive package comprises marine to nonmarine sediments. Deposition of the synrift sequences …
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Facies and provenance analysis of the Midcontinent Rift System (MRS) in Kansas
… eolian, mudflat/lake margin, lacustrine, alluvial fan, and fan delta). Overall, the studied succession comprises continental deposits laid down dominantly in alluvial and eolian settings, with the intermittent development of lacustrine systems. Three rift sequences, bound by flooding …
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Reconstructing lithofacies of the Norphlet Formation (Jurassic) as potential exploration targets: Little Cedar Creek and Brooklyn Fields, southwest Alabama
… of the Conecuh Embayment, an interpreted alluvial fan sequence should be investigated further as a possible prospect for Norphlet production.</p>
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Geochemistry and Basin Analysis of Laramide Rocky Mountain Basins
… from gravelly fluvial and/or stream-dominated alluvial fan to low-sinuosity fluvial systems. Tectonic uplift of the Washakie and Wind River Range in early Eocene formed the modern paleodrainage system, although the elevation of the basin floor was only ~500 m high at that time, and early Eocene …
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The sedimentology and petrology of the new red sandstone of the Elgin Basin, North East Scotland
… the west of the Elgin basin, a series of distal alluvial fan deposits were laid down during the late Triassic in the Golspie area. They were derived from the Old Red Sandstone and Moinian to the west. As at Elgin, faulting and accompanying mineralisation occurred during the Middle or Upper …
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