Дисертації з теми "Glauconites"
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Furquim, Sheila Aparecida Correia. "Formação de carbonatos e argilo-minerais em solos sódicos do pantanal sul-mato-grossense." Universidade de São Paulo, 2007. http://www.teses.usp.br/teses/disponiveis/8/8135/tde-18102007-142817/.
Повний текст джерелаA distinctive feature of Nhecolândia, a sub-region of the Pantanal wetland, is the presence in close proximity of freshwater and saline lakes with a huge chemical variability. The salt has been generally attributed to Pleistocene processes, but recent studies have suggested that saline waters arise from present-day concentration of freshwater by evaporation. The chemical profile of saline waters would be originated by chemical control of Ca2+, Mg2+, and Si(OH)4 as the water becomes more saline. Two processes would be responsible for this control: formation of carbonates and formation of Mg-silicates. The presence of whitish nodules and clayey horizons in soils associated to the saline lakes would be evidences of these processes. In saline-alkaline environments, carbonates such as calcite and dolomite are commonly formed by chemical precipitation, but the mechanisms responsible for Mgsilicates genesis are still under debate. The objectives of this research are: a) increasing the general knowledge about soils associated to Pantanal saline lakes through a detailed characterization of the soils located around a representative saline lake of Nhecolândia (\"Salina do Meio\"); b) identifying the processes involved in Ca2+, Mg2+ and Si(OH)4 control from saline waters, through the study of relationships between waters and minerals present in the soils around \"Salina do Meio\"; c) identifying the specific mechanisms of authigenic genesis of the minerals possibly found around \"Salina do Meio\". Soils were sampling along a toposequence and submitted to physical (particle-size), chemical (ICP-MS, pH, EC, total carbon, inorganic carbonate, exchangeable bases, and soaking in H2O, HCl 1N, and NaOH 4M), and mineralogical analyses (XRD and TEM-EDS). Water was collected along a transect involving the lake and submitted to pH, Eh, EC, temperature, titration with HCl, ion chromatography, and ICP-MS analyses. The studied soils are sandy, structureless, and present, in general, high values of pH, CE, CEC, and Na+ saturation. Prevailing of Na+ in the waters and exchangeable sites and dominance of extremely high pH strongly suggest the general action of solonization in these soils and its influence on the following processes: organic matter translocation toward deeper horizons, precipitation of carbonates (calcite, dolomite, and nahcolite) in nodules, precipitation of amorphous silica, and authigenic formation of smectites and micas. Different authigenic smectites occur along the toposequence: a) in the zone hardly reached by the lake level variation, the smectite is classified as ferribeidellite-type, present an interstratification with mica and vermiculite, and has similar amounts of Fe3+ than the Fe-mica present in the soils. These characteristics suggest that this ferribeidellite-type mineral originates from transformation of Fe-mica and that vermiculite may be an intermediate phase in this transformation; b) in the zone of seasonal lake level variation, the smectites are classified as saponite- and stevensite-type minerals. Low REE amounts in the samples enriched in saponite and stevensite, geochemical control of Mg2+ and Si(OH)4, saturation with respect to Mg smectite in the more saline waters, and presence of Mg-smectite where the maximum of evaporation is expected, prove that saponite- and stevensite-like minerals originate by chemical precipitation from the water column of the saline lake. The micas present in the studied soils are classified as illite-, glauconite- and glauconitic mica-type minerals. They present 20% or less smectite layers and seem to be associated to amorphous materials. Synthesis of micas available in the literature shows that water conditions similar to the study area allow for dioctahedral mica crystallization from initial precipitation of amorphous hydroxides. Therefore, it suggests that micas of study area are neoformed. The results of this dissertation contributed to a better understanding about the soils associated to Nhecolândia saline lakes, since most of the published researches are based on field data. The control of Ca2+ from more saline waters occurs by formation of calcite and dolomite in nodules, while the control of Mg2+ and Si(OH)4 occur by formation of Mg-smectites classified as saponite- and stevensite-type. These processes are probably responsible for the chemical variability between freshwater and saline lakes, as supposed in a previous research. Therefore, the present work gives strong evidences about the current origin of Nhecolândia salt water. Also, it showed the possibility of genesis of illite, glauconita, glauconitic mica, saponite, and stevensite minerals through direct precipitation of waters or soil solutions under concentration by evaporation.
Smaill, Joshua Ballantyne. "Geochemical variations in glauconitic minerals : application as a potassium fertiliser resource." Thesis, University of Canterbury. Geological Sciences, 2015. http://hdl.handle.net/10092/10407.
Повний текст джерелаTallobre, Cedric. "Mise en évidence d’un système de dépôt contouritique et des processus sédimentaires associés sur le plateau de Demerara (marge guyanaise)." Thesis, Perpignan, 2017. http://www.theses.fr/2017PERP0002/document.
Повний текст джерелаThe Demerara Plateau is a marginal plateau located along the French Guyana and Surinam margin. Thanks to the recent data acquired during the IGUANES cruise, with geophysical data and sedimentary cores, some sedimentary structures illustrate a strong current influence on the recent building of this margin. The sedimentary geometries suggest the presence of a Contourite Depositional System (CDS). The seafloor is marked by the presence of longitudinal structures formed by the current activity: giant flute clasts or comet marks, and longitudinal waves. Based on the chirp data analysis and on cores, some sedimentary domains are identified on the Demerara marginal plateau. The intermediate and the lower marginal plateaus are affected by contouritic process with two moats and a mounded elongated drift. This contourite is likely induced by the NADW circulation. The contourite on this plateau is made of glauconitic rich sediments inside the moat showing the winnowing effect induced by the bottom currents. The detailed study of sedimentary cores associated with a chronostratigraphic framework allows identifying the sedimentation features depending on current intensity through time. The glaucony authigenic mineral is used as a main proxy, coupled with grain-size and facies analyses, for inferring the degree of winnowing at the sediment-water interface. On the Demerara plateau, the sedimentation suggests low sediment accumulation rates and quite energetic bottom currents during ice periods.The presence of contourites along the Demerara Plateau and along other marginal plateaus shows the strong impact of such deep-sea marginal bathymetric reliefs on the oceanic circulation
Koladich, Andre Myles. "Sedimentology, sequence stratigraphy, and reservoir quality of the Lower Cretaceous Glauconitic Sandstone, southeastern Alberta." Thesis, University of Ottawa (Canada), 2004. http://hdl.handle.net/10393/26680.
Повний текст джерелаThompson, Nicholas Kim. "Cool-water Carbonate Sedimentology and Sequence Stratigraphy of the Waitaki Region, South Island, New Zealand." Thesis, University of Canterbury. Geological Sciences, 2013. http://hdl.handle.net/10092/8799.
Повний текст джерелаCampbell, Leslie Ann. "Palaeoecology of the middle to late Cambrian Rogersville Shale, Conasauga Group, eastern Tennessee." Thesis, Boston College, 2008. http://hdl.handle.net/2345/351.
Повний текст джерелаThe Rogersville Shale of the Middle to Late Cambrian Conasauga Group was deposited on the margins of Laurentia, in what is now eastern Tennessee. Based on 21 thin section samples from the ORNL-Joy2, core five distinct microlithofacies are described, trace fossils characterized, and palynological data interpreted. This investigation concluded that the Rogersville Shale was deposited in a shallow, restricted marine or possibly estuarine environment that would have been exposed to terrestrial runoff. Previous work on the Conasauga Group placed deposition of the Rogersville Shale within an intercratonic basin in approximately 250m of water, perhaps significantly deeper. This investigation found that the Rogersville Shale was likely deposited in a lagoonal setting or restricted estuarine environment that had freshwater input
Thesis (MS) — Boston College, 2008
Submitted to: Boston College. Graduate School of Arts and Sciences
Discipline: Geology and Geophysics
Udgata, Devi Bhagabati Prasad. "Glauconite as an indicator of sequence stratigraphic packages in a Lower Paleocene passive-margin shelf succession, Central Alabama." Auburn, Ala., 2007. http://repo.lib.auburn.edu/07M%20Theses/UDGATA_DEVI_55.pdf.
Повний текст джерелаUdgata, Devi Bhagabati Prasad. "DEPOSITIONAL AND STRATIGRAPHIC SIGNIFICANCE OF MARINE, GREEN-CLAY, MINERAL FACIES IN THE LOWER-MIDDLE MISSISSIPPIAN BORDEN AND FORT PAYNE FORMATIONS, WESTERN APPALACHIAN AND EASTERN ILLINOIS BASINS, KENTUCKY." UKnowledge, 2011. http://uknowledge.uky.edu/gradschool_diss/808.
Повний текст джерелаKapoutsos, David. "Provenance changes and glauconite formation in the Broken River to Iron Creek/Waipara Greensand Formations marks the late Cretaceous-Eocene transgression." Thesis, University of Canterbury. Department of Geology, 2005. http://hdl.handle.net/10092/3181.
Повний текст джерелаЛеськів, Г. З., та H. Z. Leskiv. "Очищення стічних вод від барвників шляхом адсорбції на природних дисперсних сорбентах: дисертація". Thesis, НУ ЛП, 2008. http://dspace.lvduvs.edu.ua/handle/1234567890/424.
Повний текст джерелаДисертацію присвячено розробленню технології очищення стічних вод від органічних барвників шляхом їхньої адсорбції на природних дисперсних сорбентах – глауконіті та палигорськіті. Здійснено моніторинг забруднень поверхневих вод України органічними барвниками зважаючи на локалізацію підприємств, які виробляють і застосовують барвники у своїх технологіях. Виконано токсикологічну оцінку барвників, від яких досліджено очищення стоків, а саме – активного алого 4ЖТ та аніонного червоного 8С. На основі теоретичного аналізу розроблено методику опрацювання кінетичних рівнянь, яка ґрунтується на використанні інтегрального методу. Для аналізу досліджуваних процесів запропоновано найбільш використовувані теоретичні моделі адсорбції. Розробле-но принципову технологічну схему процесу очищення стічних вод від барвників шляхом застосування природних дисперсних сорбентів. Здійснено розрахунок еколого-економічного ефекту, який досягається у випадку впровадження розробленої технології для очищення стоків фарбувально-обробних підприємств України. The dissertation is devoted to developing of the technology of wastewater cleanout from organic pigments by adsorption them on the natural dispersive sorbents: glauconite and palygorskit. The monitoring the pollution of surface waters of Ukraine with organic pig-ments according to the location of the enterprises which produce pigments and which use them in their technologies was carried out. Toxicological evaluation of the pigments, wastewater cleanout from which is being researched: active scarlet 4GT and anion red 8C, was carried out. The methods of working–out kinetic equations which is grounded on using of the in-tegral method was developed on the base of the theoretical models of adsorption were offered for analysis of the researched process. The principle technological scheme of the process of wastewater cleanout from pigments by applying natural dispersive sorbents was developed. The calcu-lation of ecologic and economic effect which could be reached in case of inculca-tion of the developed technology for cleanout of wastewaters of dyeing and man-ufacturing enterprises of Ukraine.
Payne, Danielle Sarah. "Shelf-to-slope sedimentation on the north Kaipara continental margin, northwestern North Island, New Zealand." The University of Waikato, 2008. http://hdl.handle.net/10289/2413.
Повний текст джерелаШквірко, Оксана Михайлівна. "Екологічно безпечні технології біологічної рекультивації із використанням осадів стічних вод". Diss., Національний університет "Львівська політехніка", 2020. https://ena.lpnu.ua/handle/ntb/56061.
Повний текст джерелаBasu, Pallabi. "A geochemical, Nd-Sr, and stable Ca isotopic study of siliciclastic and chemical sedimentary rocks, volcanic tuffs, and authigenic glauconites from Proterozoic sedimentary basins of India." Thesis, 2019. https://etd.iisc.ac.in/handle/2005/4712.
Повний текст джерелаChang, Shyun-sheng, and 張郇生. "A study on Characteristics of Glauconite in Taiwan." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/45021092182334431379.
Повний текст джерела國立成功大學
資源工程學系碩博士班
96
High-resolution transmission electron microscopy (TEM) accompanied with petrographic observation, X-ray diffraction (XRD) and electron probe microanalysis (EPMA) has been used to study the glauconitic pellets occurred in Tertiary sedimentary rocks from Kuohsing and Chungliao areas, central Taiwan; especially from Takeng Formation, Tsukeng Formation, and Shuichangliu Formation, respectively. The glauconitic pellets show two main types in morphology: ovoid pellets and vermicular pellets, with that the vermicular pellets is much well-crystallized than the ovoid pellets. The optical properties show that the ovoid glauconitic pellets consist of microcrystals of phyllosilicates in random orientation. Whereas, the vermicular glauconitic pellets occur like a single crystal. The vermicular glauconitic pellets has cleavages which are approximately perpendicular to the long axis of grain. The XRD results show that the glauconitic pellets contain glauconite, chlorite, and small amount of smectites. The TEM study has shown that the spheroidal pellets consist mainly of packets of glauconite and Fe-riched chlorite, muscovite, biotite. The packet size of glauconite are ranging from tens of Å to hundreds of Å (thickness in perpendicular to basal plane). There are also small amounts of submicroscopic quartz, apatite, and monazite in the pellets. The vermicular pellets consist of glauconite pellets with very little chlorite or no chlorite. The basal planes of glauconite packets are perpendicular approximately to the long axis of the vermicular pellets, whereas the glauconite and chlorite packets generally arrange in random in the spheroidal pellets. The EPMA results show vermicular glauconitic pellets has more K and Fe contents than the spheroidal or ovoid glauconitic pellets, and thus imply that spheroidal or ovoid glauconitic pellets have more glauconite/smectite mixed layers than vermicular glauconitic pellets. Based on the morphology, mineral constituents, mineral composition, and submicroscopic textures, it appears that the ovoid and vermicular glauconitic pellets have formed from precursors of faecal pellets, via glauconition and diagenesis.
KU, CHING TE, and 辜清德. "A study of mineralogy and submicrostructures of glauconite pellets in Tertiary sedimentary rocks from central Taiwan." Thesis, 1998. http://ndltd.ncl.edu.tw/handle/57129500230930845372.
Повний текст джерела國立中山大學
海洋資源研究所
86
High-resolution transmission electron microscopy (TEM) accompanied with petrographic observation, X-ray diffraction (XRD) and electron probe microanalysis (EPMA) has been used to study the glauconitic pellets occurred in Tertiary sedimentary rocks from Kuohsing and Chungliao areas, central Taiwan. The glauconitic pellets mainly occur in siltstones and mudstones that contain abundant shell fossils and trace fossils. The glauconitic pellets show two main types in morphology: spheroidal or ovoid pellets and vermicular pellets, with that the former is much abundant than the latter. The optical properties show that the spheroidal or ovoid glauconitic pellets consist of microcrystals of phyllosilicates in random orientation. Whereas, the vermicular glauconitic pellets occur like a single crystal. The vermicular glauconitic pellets has cleavages which are approximately perpendicular to the long axis of grain. The XRD results showthat the glauconitic pellets contain glauconite, chlorite, and small amount of smectites. The TEM study has shown that the spheroidal pellets consist mainly of packets of glauconite and Fe-riched chlorite, muscovite, biotite. The packet size of glauconite are ranging from tens of angstrom to hundreds of angstrom (thickness in perpendicular to basal plane). There are also small amounts of submicroscopic quartz, apatite, and monazite in the pellets. The vermicular pellets consist of glauconite pellets with very little chlorite or no chlorite. The basal planes of glauconite packets are perpendicular approximately to the long axis of the vermicular pellets, whereas the glauconite and chlorite packets generally arrange in random in the spheroidal pellets. The EPMA results show vermicular glauconitic pellets has more K and Fe contents than the spheroidal or ovoid glauconitic pellets, and thus imply that spheroidal or ovoid glauconitic pellets have more glauconite/smectite mixed layers than vermicular glauconitic pellets. Based on the morphology, mineral constituents, mineral composition, and submicroscopic textures, it appears that the spheroidal and vermicular glauconitic pellets have formed from precursors of faecal pellets, via glauconition and diagenesis.-1 -aA study of mineralogy and submicrostructures of glauconite pellets in Tertiary sedimentary rocks from central Taiwan