Готові списки джерел за темами / Wesselton

Добірка наукової літератури з теми "Wesselton"

Автор: Grafiati

Опубліковано: 10 грудня 2022

Оновлено: 28 січня 2023

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Статті в журналах з теми "Wesselton"

WHITE, J. L., R. S. J. SPARKS, K. BAILEY, W. P. BARNETT, M. FIELD, and L. WINDSOR. "KIMBERLITE SILLS AND DYKES ASSOCIATED WITH THE WESSELTON KIMBERLITE PIPE, KIMBERLEY, SOUTH AFRICA." South African Journal of Geology 115, no. 1 (February 23, 2012): 1–32. http://dx.doi.org/10.2113/gssajg.115.1.1.

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Mitchell, Roger H., E. Michael W. Skinner, and Barbara H. Scott Smith. "Tuffisitic kimberlites from the Wesselton Mine, South Africa: Mineralogical characteristics relevant to their formation." Lithos 112 (November 2009): 452–64. http://dx.doi.org/10.1016/j.lithos.2009.06.018.

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Griffin, W. L., S. R. Shee, C. G. Ryan, T. T. Win, and B. A. Wyatt. "Harzburgite to lherzolite and back again: metasomatic processes in ultramafic xenoliths from the Wesselton kimberlite, Kimberley, South Africa." Contributions to Mineralogy and Petrology 134, no. 2-3 (February 1999): 232–50. http://dx.doi.org/10.1007/s004100050481.

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McCammon, C. A. "Oxidation during metasomatism in ultramafic xenoliths from the Wesselton kimberlite, South Africa: implications for the survival of diamond." Contributions to Mineralogy and Petrology 141, no. 3 (June 2001): 287–96. http://dx.doi.org/10.1007/s004100100244.

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Hanger, Brendan J., Gregory M. Yaxley, Andrew J. Berry, and Vadim S. Kamenetsky. "Relationships between oxygen fugacity and metasomatism in the Kaapvaal subcratonic mantle, represented by garnet peridotite xenoliths in the Wesselton kimberlite, South Africa." Lithos 212-215 (January 2015): 443–52. http://dx.doi.org/10.1016/j.lithos.2014.09.030.

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Antao, Sytle M. "Crystal Structure of an Anisotropic Pyrope Garnet That Contains Two Cubic Phases." Minerals 11, no. 12 (November 26, 2021): 1320. http://dx.doi.org/10.3390/min11121320.

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The crystal structure of two different samples of pyrope garnet, ideally Mg3Al2Si3O12, from South Africa was refined using the Rietveld method, space group Ia3¯d, and monochromatic synchrotron high-resolution powder X-ray diffraction (HRPXRD) data. Sample 1 from Wesselton Mine is a single cubic phase and is optically isotropic. Electron-probe microanalysis (EPMA) provided an average composition {Mg2.30Fe2+0.26Ca0.42Mn2+0.02}∑3[Al1.53Fe3+0.06Cr3+0.40Ti4+0.01Fe2+0.01]∑2Si3O12, which contains a significant amount of Cr cations. The unit-cell parameter (Å) and bond distances (Å) are a = 11.56197(1) Å, average <Mg-O> = 2.2985, Al-O = 1.9101(4), and Si-O = 1.6343(3) Å. Sample 2 from De Beers Diamond Mine has an average composition {Mg2.33Fe2+0.33Ca0.33Mn2+0.01}∑3[Al1.73Fe3+0.12Cr3+0.06Ti4+0.05Fe2+0.05]∑2Si3O12 and is a fine-scale intergrowth of two cubic phases. The weight percentage, unit-cell parameter (Å), and bond distances (Å) for phase 2a are 62.2(1)%, a = 11.56185(1) Å, average <Mg-O> = 2.3006, Al-O = 1.9080(4), Si-O = 1.6334(4) Å. The corresponding values for phase 2b are 37.8(1)%, a = 11.53896(1) Å, average <Mg-O> = 2.2954, Al-O = 1.9020(6), Si-O = 1.6334(6) Å. The two cubic phases in sample 2 cause the crystal to be optically anisotropic because of strain induce birefringence. The unit-cell parameter and bond distances for sample 1 are similar to those in phase 2a.

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Smith, C. B., H. L. Allsopp, O. G. Garvie, J. D. Kramers, P. F. S. Jackson, and C. R. Clement. "Note on the UPb perovskite method for dating kimberlites: Examples from the Wesselton and De Beers mines, South Africa, and Somerset Island, Canada." Chemical Geology: Isotope Geoscience section 79, no. 2 (August 1989): 137–45. http://dx.doi.org/10.1016/0168-9622(89)90016-x.

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Mokgakane, Thabile Joyce, Victor Mlambo, Khuliso Emmanuel Ravhuhali, and Norman Magoro. "Contribution of Soil Type to Quantity and Nutritional Value of Grass Species on the South African Highveld." Resources 10, no. 10 (October 18, 2021): 106. http://dx.doi.org/10.3390/resources10100106.

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The biggest threat to cattle production in most South African communal areas is poor management of grazing, which negatively affects vegetation and soil structures. This study was conducted to assess the spatial variation of grass species density, production potential and quality in Breyten (Hutton soil type), Davel (Avalon soil type), and Wesselton (Clovelly soil type) communal rangelands in the highveld region of Mpumalanga province. Three 100 m transects per grazing area, placed at 50 m intervals (0, 50, and 100 m) were used to collect soil samples at 200 mm depth. A 100 m permanent line point method, replicated three times (50 m apart) per site, was used to identify and collect grass species samples. Grass species were classified according to life form, palatability, ecological status, and abundance. Grasses species were also harvested for chemical composition and in vitro ruminal dry matter degradability determination. Soils from the study areas had an acidic pH range (3.5–4.5). Hutton soil had the highest (p < 0.05) nitrate (N-NO3) concentration (0.770 mg/kg) compared to Clovelly (0.030 mg/kg) and Avalon (0.533 mg/kg) soil types. Thirty-one grass species composed of 28 turf perennials, two weak perennials and one perennial creeping grass were identified across the study areas. About 16% of identified grass species were classified as highly palatable, 39% as moderately palatable, and 32% as unpalatable. Across all the soil types, Digitaria eriantha had the highest (p < 0.05) crude protein (CP) (106.5 g/kg DM) content when compared to other grass species. In the Avalon soil type, D. eriantha had the lowest (p < 0.05) neutral detergent fiber (NDF) (696.4 g/kg DM). Across all soils, D. eriantha, Aristida congesta, Eragrostis curvula, Eragrostis gummiflua, and Eragrostis plana grasses had the same (p > 0.05) 48-h in vitro ruminal dry matter degradability Hutton soil had a higher proportion of common and dominant grass species as well as more palatable species with higher crude protein content than Avalon and Clovelly soils. However, for all three rangelands, there is a need for supplementary feeding to enhance the production efficiency of livestock given that the nutritive value of grasses was low.

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Wieck, Angelika. "Prevention of bipolar episodes with lithium in the perinatal period." British Journal of Psychiatry 211, no. 1 (July 2017): 3–4. http://dx.doi.org/10.1192/bjp.bp.116.193508.

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SummaryBecause lithium is now recommended as the initial long-term treatment for bipolar disorder in general and has a lower teratogenic potential than originally reported, it may become more frequently prescribed in childbearing women. The article by Wesseloo et al in this issue provides helpful data and guidance for managing lithium dosing in the perinatal period.

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Klein, Richard G. ": The Omo Micromammals: Systematics and Paleoecology of Early Man Sites from Ethiopia . Henry B. Wesselman." American Anthropologist 88, no. 1 (March 1986): 231–32. http://dx.doi.org/10.1525/aa.1986.88.1.02a00710.

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Дисертації з теми "Wesselton"

Hanger, Brendan Joseph. "Redox conditions in the cratonic lithosphere and implications for metasomatism." Phd thesis, 2014. http://hdl.handle.net/1885/12231.

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The redox state of the cratonic lithosphere and its impact on metasomatism have been examined using garnet peridotite xenoliths from two kimberlite pipes (Wesselton and Kimberley) in the Kaapvaal Craton, South Africa. Conventional petrologic techniques, along with electron probe microanalysis (EPMA) and laser ablation-inductively coupled plasma-mass spectrometry (LA-ICP-MS), were used to characterise the samples and identify metasomatic events. Evidence of at least one such event was found in the Wesselton samples. Iron K-edge X-ray absorption near-edge structure (XANES) spectroscopy was used to determine the Fe3+/âˆ‘Fe of garnet from both suites, and then calculate the oxygen fugacity (fO2). The Wesselton samples were found to show a decrease in fO2 (relative to the fayalite-magnetite-quartz buffer) with increasing pressure, which was overprinted by an oxidation event in zoned garnet crystals, which were observed in one sample. The fO2 of the core of the zoned crystals was consistent with equilibrium with a carbonated silicate melt, and is possible that the oxidised nature of this melt is related to formation of the metasomatised rim observed, which is more oxidised than the garnet core. XANES spectroscopy was used to produce the first fully quantitative map of the distribution of Fe3+/âˆ‘Fe in garnet for one of these crystals, which confirmed the variation in fO2 between the core and rim, strengthening the relationship between oxidation and metasomatism. The interface between the two compositional zones showed a very short profile and this was examined using both electron probe microanalysis and NanoSIMS. The compositional profile at this interface was modelled as a diffusive process and it was found that the zonation formed in 2 - 10 years. The diffusion coefficients (relative to Ca) of Na, Cr, Ti and Y in mantle garnet were also determined for the first time.

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Книги з теми "Wesselton"

Wesselmann, Tom. Tom Wesselman: Black and white drawings 2002-2003. Bonn: Weidle Verlag, 2005.

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Publishing, RH Value. Wesselman. Random House Value Publishing, 1985.

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Частини книг з теми "Wesselton"

"wesselton." In Dictionary Geotechnical Engineering/Wörterbuch GeoTechnik, 1526. Berlin, Heidelberg: Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-41714-6_231427.

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"top wesselton." In Dictionary Geotechnical Engineering/Wörterbuch GeoTechnik, 1412. Berlin, Heidelberg: Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-41714-6_201911.

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