Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 230 for “"dolomite"”.
-
Dolomite as a paleoenvironmental archive
Dolomite [CaMg(CO₃)₂] is abundant in the rock record and preserves, in its chemical composition, information about the environment in which it formed. The scarcity of dolomite forming in modern oceans and evidence for dolomite replacing primary calcium carbonate (CaCO₃) in ancient and modern …
-
Stratigraphy and sedimentology, Cambrian Shady Dolomite, Virginia
Cambrian Shady Dolomite facies exposed northwest and southeast of Austinville, southwestern Virginia, apparently formed in a platform-to-basin setting. Northwest of Austinville, the Shady Dolomite (600 m thick) overlies the Lower Cambrian Erwin Formation and is overlain by the Middle Cambrian Rome …
-
Industrial Wastewater Treatment Using Dolomite And Dolomitic Sorbents
… but also municipal discharges. <br/>Dolomite was investigated as a treatment for eutrophic water as it had received considerable research attention in recent years because of its abundance and relative value. Dolomite was readily available from an open mine in Co. Fermanagh where it …
-
Contributions to the solution of the problem of dolomite genesis
Includes bibliographical references.
-
Analytical and numerical study of dolomite sinkholes in Centurion South Africa
… groundwater level which erodes weathered altered dolomite (WAD) residuum into karst cavities. Substantial literature has explored the stability of sinkholes, with reliance on limit analysis and empirical data, to quantify the strength of the porous karst residuum. In this study, the appraisal of …
-
Petrography and Diagenesis of Cambrian Dolomite in Tabei Uplift, Northern Tarim Basin, China
… analysis and fluid inclusion analysis, the dolomites are interpreted as: Type 1 dolomite is microcrystal to very fine-crystalline replacement dolomite associated with mudstone, wackestone and packstone with well-preserved the precursor texture of limestone. Its δ18O value ranges from -5.7 to …
-
Sedimentology and diagenesis of Lower to Middle Cambrian carbonate platform, Shady Dolomite, Virginia
… cores through the Lower to Middle Cambrian Shady Dolomite carbonate platform (600 to 1200 m thick) in the Austinville, Virginia, region allow the evolution of the carbonate platform from a gently sloping ramp, to a high relief, rimmed shelf to be documented. The Shady Dolomite forms the initial …
-
Stratigraphy of the Ordovician Ely Springs Dolomite in the Southeastern Great Basin, Utah and Nevada
Made available in DSpace on 2014-12-14T07:10:44Z (GMT). No. of bitstreams: 1 7606717.pdf: 8209840 bytes, checksum: 7484b75931e5c743fb4155111911971f (MD5) Previous issue date: 1975
-
Membrane properties of intact rock cores of Burlington Limestone, Jefferson Dolomite, Darrington Phyllite, and low permeability concrete
… actual rock discs of Quarry Ridge Jefferson Dolomite, Darrington Phyllite, Lower Burlington Limestone, and low permeability concrete to determine if tight lithologies can function as membranes"--Abstract, page iv.
-
Carbonate Microfacies and Depositional Environments of the Joachim Dolomite (Middle Ordovician), Southeast Missouri and Southern Illinois, u.s.a
… eleven stratigraphic sections of the Joachim Dolomite located in southeast Missouri and southern Illinois.
-
The use of shaped explosive charges to investigate permeability, penetration, and fracture formation in coal, dolomite and plexiglas
"The concentration of methane gas which exists in the exhaust air from a coal mine is critical. It can be controlled by dilution of the gas with fresh air or by the regulation of the rate of methane emission into the mine workings. Degasification techniques which control the emission rate are …
-
Assessing the Role of Solution Chemistry and Organic Matter in the Genesis of the Dengying Formation Dolostones at Sichuan Basin, China
… role that microorganisms play in low-temperature dolomite formation is still unresolved. Given the scarcity of dolomite in modern low-temperature depositional settings, controls on its formation remain unclear. Textural evidence from modern and ancient geomicrobiological dolomite-forming …
-
Paragenesis of Lacustrine Microbialites in the Upper Wilkins Peak Member, Green River Formation, Wyoming
… bed contain some primary calcite with diagenetic dolomite and abundant secondary silicification. Later, dolomite replaces both calcite and quartz. Pores are commonly filled with 20 μm euhedral dolomite cements and in some samples with 10 μm crystals of quartz replacing dolomite. The diagenetic …
-
Regional dolomitization of Early Ordovician, Upper Knox Group, Appalachians
… by Fischer plots. The Upper Knox Group is 90% dolomite of which greater than 75% predates Middle Ordovician, Knox Unconformity development. Early dolomitization occurred penecontemporaneously with tidal flat progradation during fifth-order (up to 100 k.y.) sea-level falls as indicated by: …
-
Investigating the Fate of Mg-bearing Calcium Carbonates During Early Diagenesis
The formation of dolomite at low temperature (<80ºC) is uncommon in modern environments, however dolomite is abundant in the geologic record. The paradox between the scarcity of modern dolomite and abundance in ancient dolomite has been of long-term interest to geologists. Further, because dolomite …
-
A Comparative Study of Silicified Rock Reservoir in Shunnan 4 well of Tarim Basin with Hydrothermal Chert Reservoir of Parkland Gas Field in Western Canada Sedimentary Basin
… hydrothermal chert reservoir interbedded among dolomite and dolomitic mudstone in the Wabamun Group of Upper Devonian, discovered in 1956 in Parkland, NW Western Canada sedimentary basin (WCSB). Due to limited reference in this chert reservoir, detailed work including core and thin section …
-
Interplay between mineral reaction and deformation via structural defects
… of a magnesio-calcite precursor layer and a dolomite reaction rim in every experiment at isostatic annealing and deformation conditions. CHAPTER 1 briefly introduces general aspects concerning mineral reactions in nature and diffusion pathways for mass transport. Moreover, results of previous …
-
Understory vegetation patterns in oak savannas of the Missouri Ozarks
… showed sites grouping by rhyolite, cherty dolomite, and limestone/dolomite substrate types. DCA axes correlated with landscape variables and fire frequency, but correlations were generally weak, suggesting that differences in site history may be important in governing species composition. …
-
Paleofluid Flow, Fracturing and Reservoir Implications in Foreland basins: an example from the Cretaceous Qamchuqa Formation, Kurdistan Iraq
… unique and complex arrays of saddle and zebra dolomite textures especially in fractured intervals. Such carbonates are structurally controlled and affected by hydrothermal fluid flow and represent one of the major and important reservoir rocks in the High Folded oilfields. An integrated study …
Page 1 of 12