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Showing 1 to 20 of 94 for “"dike"”.
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Analysis of flood hazard under consideration of dike breaches
River reaches protected by dikes exhibit high damage potential due to strong value accumulation in the hinterland areas. While providing an efficient protection against low magnitude flood events, dikes may fail under the load of extreme water levels and long flood durations. Hazard and risk …
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Gravity survey of the Ralston Dike, Jefferson County, Colorado
Includes bibliographical references.
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Magnetic survey of the Ralston Dike, Jefferson County, Colorado, A
Includes bibliographical references.
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Dike-Driven Hydrothermal Processes on Mars and Sill Emplacement on Europa
… and Europa. For the first project, we set up a dike-driven hydrothermal system and calculated heat and water flow using boundary layer theory. Water flow rates and volumes were then compared to the requirements for surface feature formation. Results found that the water volumes produced were …
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PETROLOGY, GEOCHEMISTRY, AND AGE OF EXTENSION IN THE LOST TRAIL PASS DIKE SWARM, SOUTHWEST MONTANA
The East Fork Dike Swarm (EFDS) at Lost Trail Pass (LTP) is one of many dike swarms that lie within the North American Cordillera, a region that has been transformed through the complex interactions between contemporaneous tectonics and magmatism. Determining the age of the EFDS at LTP, and the LTP …
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PETROLOGY, GEOCHEMISTRY, AND AGE OF EXTENSION IN THE LOST TRAIL PASS DIKE SWARM, SOUTHWEST MONTANA
The East Fork Dike Swarm (EFDS) at Lost Trail Pass (LTP) is one of many dike swarms that lie within the North American Cordillera, a region that has been transformed through the complex interactions between contemporaneous tectonics and magmatism. Determining the age of the EFDS at LTP, and the LTP …
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Assemblage characteristics and sampling considerations for aquatic macroinvertebrates inhabiting a lower Mississippi River stone dike
… assemblages associated with stone dikes on the Lower Mississippi River and to obtain basic information on assemblage composition, structure, and patterns of distribution over a dike. For study purposes, stone-filled baskets were implanted into a dike near Vicksburg, Mississippi, in …
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Petrological and geochemical study of spilites and associated dike rocks from the Virgin Island core (Caribbean Island arc)
… portion of the core is also intruded by four dikes: two amphibole porphyryes (129-13h and 732-7&2 feet): an albite-diabase (177-226 feet) and an andesine-diabase (8h7-1003 feet).</p> <p>The spilite is a fine—grained rock with pilotaxitic and intersertal textural features. Throughout the flow, …
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Classification and petrogenesis of the Tongo dike-01 from the Tongo-Tongoma cluster, Sierra Leone: constraints from bulk rock geochemistry
… representative samples from the Cretaceous Tongo dike-01, Sierra Leone have been analysed for their bulk-rock major and trace elements as well as Sr-Nd-Pb isotope geochemistry. The primary objectives of this study are: 1) provide detailed petrographic observations of the dike, 2) classify the dike …
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The petrology of the Elephant's Head dyke and New Amalfi sheet
… (South Africa). The one intrusion is a multiple dike of exceptional form and great length. It served as the main feeder of the second intrusion, a thick transgressive sheet. Two magmas contributed to the formation of the dike. A first intrusion of tholeiite magma was followed by the injection of …
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Significance of magma mingling and mixing during the formation of the host-rock successions of Archean massive sulfide deposits in the Noranda camp, Abitibi subprovince, Quebec, The
… volcanic succession that is crosscut by mafic dikes feeding into a conformably overlying mafic volcanic package. One of the best exposed and preserved sections of Horne stratigraphy is located in the Horne West area. In this area, a large flow-banded rhyolite cryptodome containing abundant …
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PETROLOGIC AND GEOCHEMICAL ANALYSIS OF INTERMEDIATE TO MAFIC MAGNETITE-BEARING VOLCANIC FLOWS AND ASSOCIATED DIKES IN THE KNIGHT RANGE, GRANT COUNTY, NEW MEXICO
… which is intruded by Proterozoic diabase dikes that contain ~12% magnetite. Important to this study are the Tertiary intermediate to mafic volcanic rocks and dikes in this package that are magnetite-bearing. Field work was initiated to investigate significant volumes of previously …
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Aqua + Culture: Intergrating Fish, Farming, and Flood-control Systems on Four Mile Run
… a highly integrated agricultural system called dike-pond system in Pearl River Delta, South China. From the study, two aspects of dike-pond system are found interesting. One is the material flow in the system which makes full use of the by-products. The other is the function of preventing …
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Relation of Missouri river flows to sandbar morphology with implications for selected biota
… ATTZ (elevation) for point and wing-dike sandbars within a segment of the lower Missouri River. Point sandbars were as much as 22 times greater in mean area than wing-dike sandbars for submergent and emergent ATTZ, whereas wing-dike sandbars were more abundant, composing 85% of all …
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Assemblage structure and shallow-water habitat use by small-bodied fishes at lower Missouri River sandbars
… Missouri River (LMOR). Existing point and wing-dike sandbars represent a potentially important source of SWH to fishes during early ontogeny within the main channel of LMOR. Small-bodied fishes were sampled using pre-positioned electrofishing devices from 0.0-0.5 m water depths adjacent to four …
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Petrogenetic study of the Porcupine Lake mafic intrusive complex, Trinity terrane, northern California
… primarily of ultramafic-mafic plutonic and dike lithologies. The plutonic rock forms steep intrusive contacts with adjacent Ordovician peridotite, and consists of basal layered peridotite, cumulate clinopyroxenite, and isotropic gabbro. East-west trending mafic-to-felsic aphanitic dikes …
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The accretion of lower oceanic crust
… and recovered the first in situ sampling of the dike/-gabbro boundary. Hess Deep is a tectonic window where the westward propagation of the Cocos-Naza Ridge has rifted ocean crust formed at the EPR and exposed the lower ocean crust at the seafloor.<br/><br/>The whole rock profile for Hole 1256D …
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Using linear inverse methods and finite element models to explore sensitivity to homogeneous elastic half-space assumptions in deformation models of the 2000 eruption of Hekla volcano, Iceland
… with the movement of a shallow fissure (i.e. dike) during the eruption (Ofeigsson et al., 2011). These data present the opportunity to use inverse methods to estimate parameters describing the behavior of the eruptive fissure (Fukushima et al., 2010, Anderson and Segall, 2011, Ofeigsson et …
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The effect of dikes on water surfaces in a mobile bed
Dikes, also referred to as groynes, have been used on rivers in both the U.S. and abroad to solve river engineering problems dating back to the nineteenth century. They are the prominent tool used to maintain navigation depths and prevent bank erosion on many major rivers in the world. A dike is …
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