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Showing 1 to 20 of 78 for “"breccia"”.
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Apophyllite weathering and the aqueous geochemistry of a Karoo breccia pipe
… phase occupying fractures in a dolerite breccia pipe on the farm Kopoasfontein, outside Calvinia in the western Karoo, South Africa. Groundwater abstracted from this breccia is uncharacteristically alkaline (pH 10) and high in fluoride (11 mg/L) for a natural water and the link between …
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Geochemistry of artificial groundwater recharge into the Kopoasfontein breccia pipe near Calvinia, Karoo
… would be injected into the Kopoasfontein breccia pipe, a roughly cylindrical body of fractured rock, 12 km east of the town. Subsurface water storage would then mjnjmjse evaporative losses, so that the injected water could be recovered when emergency water supplies are needed. Underground …
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A low - δ 18 O intrusive breccia from the Koegel Fontein complex, South Africa
… the lowest δ 18 O values belong to an intrusive breccia and have a fine - grained, black matrix. The silica content of these breccia rocks ranges between 44 - 68 wt %, their whole - rock δ 18 O values vary between - 5.2 ‰ and +1.8 ‰ , and their water content is between 0.2 - 1.1 wt %. The major …
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Laser induced breakdown spectroscopy of martian breccia Northwest Africa 7034: comparison with Mars Science Laboratory results
… of 1.56-7 meters. At the same time, martian breccia meteorite Northwest Africa (NWA) 7034 was analyzed with the ChemCam engineering model laboratory LIBS instrument at Los Alamos National Laboratory (LANL) at a 1.6 m standoff distance under 7 Torr CO2. Each LIBS location was pulsed with 150 …
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Petrographic Analysis of an Early Cenozoic Breccia from the Tinton Area, Northern Black Hills, South Dakota
<p>The Tinton area breccia crops out in two areas in the northern Black Hills just northwest of Tinton, South Dakota, in an area of Precambrian metamorphic rocks, pegmatites, and Tertiary intrusives. The outcrops are fairly circular, the smaller measuring 150 meters and the larger measuring 400 …
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Petrography and Field Mapping of Eocene Intrusions and Adjacent Breccia Zones at the Scraper Springs Prospect, Elko County, Nevada
… adjacent silicified/advanced argillic lithocap breccias. Petrography and sodium-cobaltinitrite staining supplement field observations to aid in understanding alteration events. Geochemical data from topaz-rich samples are considered to help classify the hydrothermal system present at Scraper in …
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Lithofacies and Microfacies of a Fossil Hot Spring System: McGinness Hills, Nevada
… system in which hydrothermal, eruption breccia is exposed on top of the sinter mound. Based on lithology, macro-features and micro-features the sinter at McGinness Hills was divided into seven microfacies, hydrothermal breccia, massive chalcedonic sinter, flat-laminated sinter, …
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Lithofacies and Microfacies of a Fossil Hot Spring System: McGinness Hills, Nevada
… system in which hydrothermal, eruption breccia is exposed on top of the sinter mound. Based on lithology, macro-features and micro-features the sinter at McGinness Hills was divided into seven microfacies, hydrothermal breccia, massive chalcedonic sinter, flat-laminated sinter, …
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Modeling the diffusion of reactive and nonreactive solutes in cores from the Cannikin Test Site, Amchitka Island, Alaska
… and nonreactive solutes through basalt and breccia cores from the Cannikin Test Site, Amchitka Island, Alaska has been studied. Lead (Pb(II)) and cesium (Cs(I)) were chosen as reactive solutes and bromide (Br-) was chosen as the nonreactive solute. Because retardation due to sorption is …
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A study of the kimberlites, diamonds and associated rocks and minerals from the monastery mine, South Africa. Volume 1: Text
… but is poorly exposed and highly weathered. The breccia kimberlite hosts abundant country rock fragments in a soft serpentinous matrix. It is an opaque oxide-rich phlogopite serpentine kimberlite breccia. The precursor kimberlite dyke associated with the diatreme is an opaque oxide-rich calcite …
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Geology, paragenesis, and geochemistry of sphalerite mineralization at the Young mine, Mascot-Jefferson City zinc district, East Tennessee
… Sphalerite mineralization which occurs as a breccia infilling in the Lower Ordovician Knox Group carbonates has been studied in detail at the Young Mine, located in the central portion of the district. The sphalerite occurs as fracture fillings and as rosettes between carbonate breccia blocks …
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Heterotrophic Microbial Colonization of the Interior of Shocked Rocks from the Haughton Impact Structure, Devon Island, Nunavut, Canadian High Arctic
… in the interior of impact-shocked gneiss and breccia samples from Haughton Impact structure on Devon Island, Nunavut, in the Canadian High Arctic. The high-latitude and arid, polar climate at Haughton preclude significant populations of higher-order organisms, naturally restricting the impact …
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Geology of igneous extrusive and intrusive rocks in the Sundance area, Crook County, Wyoming
… Quartz latite occurs as subparallel units of breccia, tuff, and massive flows without any clear cross-cutting relationships. Fragmental types (breccia and cuff) constitute 41 to 76 percent of the rocks, suggesting that Sundance Mountain is a mixed cone. The quartz latite has a pre dominantly …
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The Middle Ordovician Knox unconformity, Virginia Appalachians: transition from passive to convergent margin
… filled with detritus from the unconformity and breccia from host carbonates, and sub-unconformity dolomite breccia bodies that formed by collapse after dissolution of limestone interbeds. Coarse detritus on the unconformity surface formed thin to thick veneers of regolith; locally this material …
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Geology of the Northern Alto Relex Area, Big Bend National Park, Brewster County, Texas
… Distinctive ii reddish-brown knobs of fault breccia on the west side of Alto Relex appear to have been silicified or hydrothermally altered. This breccia probably marks the location of a large basin-bounding normal fault. Both map-scale and outcrop scale folding is present. One map-scale …
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Petrology of the Cenozoic igneous rocks of the Tinton district, Black Hills, South Dakota - Wyoming
… dike complex, lamprophyre dikes and intrusive breccia.</p> <p>Precambrian rocks are represented by a sequence of metapelites thst have been intruded by metabasite and granitic pegmatite dikes. The schistosity of the metapelites strikes NNW with a consistent westerly dip of 28° to 90°. The …
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Relationship Between Fault Zone Architecture and Groundwater Compartmentalization in the East Tintic Mining District, Utah
… in otherwise impermeable units. The fault core breccia has been re-cemented and mineralized, which eliminates porosity in the rock by creating a thick impermeable zone, which has compartmentalized groundwaters across the fault zone. The compartmentalization of groundwater shows that fault zone …
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INVESTIGATING THE ROLE OF DEFECTIVE CELL TO CELL COMMUNICATION MECHANISMS IN RETT SYNDROME PATHOGENESIS
Rett syndrome (RTT) is a devastating neurodevelopmental disorder representing the main cause of severe intellectual disability in girls worldwide. Over 95% of individuals suffering from a classic form of RTT carry sporadic mutations in the X-linked MECP2 gene, encoding for the methyl-GpC-binding …
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Interpretation of Vibroseis reflections from within the Catoctin Formation of central Virginia
… epidotised layers ( epidosites and volcanic breccia) and non-epidotised layers (greenstones and phyllites) within the Catoctin Formation. Acoustic impedance contrasts also exist between greenstones (metabasalts) and phyllites (metasediments). Constructive interference of small amplitude …
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