Academic literature on the topic 'Breccia – Ontario – Greater Sudbury'
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Journal articles on the topic "Breccia – Ontario – Greater Sudbury"
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Chubb, P. T., D. C. Vogel, D. C. Peck, R. S. James, and R. R. Keays. "Occurrences of pseudotachylyte at the East Bull Lake and Shakespeare–Dunlop intrusions, Ontario, Canada." Canadian Journal of Earth Sciences 31, no. 12 (December 1, 1994): 1744–48. http://dx.doi.org/10.1139/e94-155.
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Pseudotachylyte bodies were recently identified within and adjacent to the Early Proterozoic East Bull Lake and Shakespeare–Dunlop intrusions, located approximately 25–40 km west-southwest of the western margin of the Sudbury Igneous Complex. These breccia-like bodies locally form extensive vein networks and are preferentially developed along the contact between the intrusions and older Archean granitoid rocks. The pseudotachylyte veins comprise variable proportions of locally derived rock fragments and an aphanitic to fine-grained crystalline matrix that commonly displays flow textures. The veins appear to have formed by intense cataclasis and (or) frictional melting. These occurrences are very similar in appearance to Sudbury Breccia dykes that are observed at a radial distance of up to 80 km from the Sudbury Igneous Complex. Sudbury Breccia is widely believed to have formed as a result of the Sudbury event—a cataclysmic explosion that occurred at 1.85 Ga. The location of the pseudotachylyte veins described herein may coincide with one of the concentric bands of relatively intense Sudbury Breccia development observed to the north of the Sudbury Igneous Complex.
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Braverman, Doreen. "Greater Sudbury / Grand Sudbury, Ontario." Raven: A Journal of Vexillology 18 (2011): 59–61. http://dx.doi.org/10.5840/raven20111834.
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Parmenter, Andrew C., Christopher B. Lee, and Mario Coniglio. ""Sudbury Breccia" at Whitefish Falls, Ontario: evidence for an impact origin." Canadian Journal of Earth Sciences 39, no. 6 (June 1, 2002): 971–82. http://dx.doi.org/10.1139/e02-006.
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Sudbury breccias are unusual clastmatrix rock bodies formed in abundance around the Sudbury Igneous Complex, the most obvious manifestation of a major impact event at Sudbury. At Whitefish Falls, ~70 km southwest of Sudbury, similar breccias consisting of clasts of argillite and amphibolite dyke enclosed in a fine-grained matrix of host rock are developed in metamorphosed argillites of the Huronian Supergroup. Pre-brecciation brittle textures in the host argillite and breccia clasts, such as layer-parallel foliation offset by cataclastic fractures, suggest that the host rock was entirely competent prior to brecciation. One composite penetrative foliation and its associated ductile folding were also formed in the argillite host prior to brecciation. Post-brecciation ductile deformation produced a regionally dominant eastwest-trending foliation, and two late-stage folding events, and indicate a syn-Penokean age of brecciation. The breccias at Whitefish Falls are enriched in ferromagnesian minerals compared to adjacent, embayed and partially digested, host rock. Flow-foliated breccia matrices surround a highly rounded clast phase. These features are characteristic of impact-related pseudotachylyte, formed during extreme cataclasis and friction melting of the impacted host rock. We propose that these breccias formed by injection of a high-strain, pseudotachylytic melt, triggered by the Sudbury impact event, and focused along a blind superfault, coincident with a post-Penokean high-strain zone.
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Kellett, R. L., and B. Rivard. "Characterization of the Benny deformation zone, Sudbury, Ontario." Canadian Journal of Earth Sciences 33, no. 9 (September 1, 1996): 1256–67. http://dx.doi.org/10.1139/e96-095.
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Remote sensing imagery and geophysical data are well known as valuable tools for reconnaissance mapping in unknown areas, but they can also be used to reinterpret existing regional geological maps. A combination of airborne magnetic data and synthetic aperture radar images, at both a regional and a detailed scale, have been used to identify a wrench-fault system on the Canadian Shield north of the Sudbury structure. The 3–4 km wide deformation zone comprises a set of subparallel vertical faults bounding blocks of Archean granites, Archean metavolcanics of the Benny greenstone belt, and Paleoproterozoic metasediments of the Huronian supergroup. Using high-resolution airborne radar and magnetic data, the fault zone is found to extend for 40 km along the southern margin of the Benny greenstone belt. The wrench-fault system may have been tectonically active during several episodes throughout the Proterozoic. An interpretation of these data, supported by additional field mapping, indicates that the 1240 Ma Sudbury dyke swarm has been intruded through the deformation zone after its most active period of movement. Overprinting of Sudbary impact breccia at the southern edge of the deformation zone suggests that some movement occurred on the faults postdating the 1850 Ma meteorite impact. Lineaments that correlate spatially with the wrench-fault system can be traced across the southern Superior Province and the Cobalt Embayment on the regional images. However, more high-resolution studies are required to establish the same overprinting relationships along the length of the lineaments.
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Gurov, E. P., V. V. Permiakov, and B. M. French. "REMAINS OF PALEOFLORA IN THE BRECCIAS OF THE ONAPING FORMATION, SUDBURY IMPACT STRUCTURE, ONTARIO, CANADA." Geological Journal, no. 1 (April 16, 2021): 17–31. http://dx.doi.org/10.30836/igs.1025-6814.2021.1.222790.
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Electron microscopic investigations of four breccia samples of the Onaping Formation, Sudbury impact structure, Canada, have been carried out for the search of possible remains of paleoflora and identification of the nature of organic matter and their composition. Two forms of plant remains were discovered in the breccias. The first form is represented by single plant particles scattered in the matrix of breccias and included in gas vesicles in devitrified glasses. These particles are leaf-shaped, stem-shaped, tubular, and spherical objects, ranging from 5-10 to 200-300 µm in size. It is supposed that algal flora inhabiting the sea basin before the Sudbury impact was the source of this form of plant residues in breccias. The second form of plant remains in breccias is represented by plant detritus in carbon-bearing fragments of mudstones included in the breccia matrix. These fragments, reaching a size to 1000-1200 µm, have irregular shapes and complicated rugged contacts with the host breccia. Plant residues in mudstones are mainly ribbon-like scraps from 3-5 to 200-300 µm long, some while rare particles have a more complex shape. The matrix of the mudstones is a heterogeneous fine-grained clay-like substance with a network of micron-wide open joint fissures. The carbon content in mudstone matrix ranges from 7-10 to 20-25 wt%. Muddy bottom sediments of the pre-impact sea basin are supposed to be a source of mudstone fragments in breccias, while the algal flora inhabited the sea during their sedimentation served as a source of plant detritus in mudstones. Fragments of mudstones and floral residues are an important source of organic carbon in breccias of the Onaping Formation. The discovery of paleofloral remains in the breccias indicates the existence of a previously unknown complex algal flora that inhabited the pre-impact sea before the impact event 1.85 billion years ago at the very end of the Paleoproterozoic. The Sudbury impact structure is comparable in size to the Chicxulub impact structure, the formation of which caused the Cretaceous-Paleogene mass extinction. We assume that the formation of the Sudbury structure had a catastrophic impact on the paleoflora of the late Paleoproterozoic, the remnants of which were preserved in the breccias of the Onaping Formation.
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O’Callaghan, J. W., G. R. Osinski, P. C. Lightfoot, and R. L. Linnen. "Reconstructing the geochemical signature of Sudbury Breccia, Ontario, Canada: implications for exploration models." Applied Earth Science 125, no. 2 (April 2, 2016): 92–93. http://dx.doi.org/10.1080/03717453.2016.1166658.
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Fullagar, Peter K., Dean W. Livelybrooks, Ping Zhang, Andrew J. Calvert, and Yiren Wu. "Radio tomography and borehole radar delineation of the McConnell nickel sulfide deposit, Sudbury, Ontario, Canada." GEOPHYSICS 65, no. 6 (November 2000): 1920–30. http://dx.doi.org/10.1190/1.1444876.
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In an effort to reduce costs and increase revenues at mines, there is a strong incentive to develop high‐resolution techniques both for near‐mine exploration and for delineation of known orebodies. To investigate the potential of high‐frequency EM techniques for exploration and delineation of massive sulfide orebodies, radio frequency electromagnetic (RFEM) and ground‐penetrating radar (GPR) surveys were conducted in boreholes through the McConnell massive nickel‐copper sulfide body near Sudbury, Ontario, from 1993–1996. Crosshole RFEM data were acquired with a JW-4 electric dipole system between two boreholes on section 2720W. Ten frequencies between 0.5 and 5.0 MHz were recorded. Radio signals propagated through the Sudbury Breccia over ranges of at least 150 m at all frequencies. The resulting radio absorption tomogram clearly imaged the McConnell deposit over 110 m downdip. Signal was extinguished when either antenna entered the sulfide body. However, the expected radio shadow did not eventuate when transmitter and receiver were on opposite sides of the deposit. Two‐dimensional modeling suggested that diffraction around the edges of the sulfide body could not account for the observed field amplitudes. It was concluded at the time that the sulfide body is discontinuous; according to modeling, a gap as small as 5 m could have explained the observations. Subsequent investigations by INCO established that pick‐up in the metal‐cored downhole cables was actually responsible for the elevated signal levels. Both single‐hole reflection profiles and crosshole measurements were acquired using RAMAC borehole radar systems, operating at 60 MHz. Detection of radar reflections from the sulfide contact was problematic. One coherent reflection was observed from the hanging‐wall contact in single‐hole reflection mode. This reflection could be traced about 25 m uphole from the contact. In addition to unfavorable survey geometry, factors which may have suppressed reflections included host rock heterogeneity, disseminated sulfides, and contact irregularity. Velocity and absorption tomograms were generated in the Sudbury Breccia host rock from the crosshole radar. Radar velocity was variable, averaging 125 m/μs, while absorption was typically 0.8 dB/m at 60 MHz. Kirchhoff‐style 2-D migration of later arrivals in the crosshole radargrams defined reflective zones that roughly parallel the inferred edge of the sulfide body. The McConnell high‐frequency EM surveys established that radio tomography and simple radio shadowing are potentially valuable for near‐ and in‐mine exploration and orebody delineation in the Sudbury Breccia. The effectiveness of borehole radar in this particular environment is less certain.
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Shaw, CSJ, G. M. Young, and C. M. Fedo. "Sudbury-type breccias in the Huronian Gowganda Formation near Whitefish Falls, Ontario: products of diabase intrusion into incompletely consolidated sediments?" Canadian Journal of Earth Sciences 36, no. 9 (September 1, 1999): 1435–48. http://dx.doi.org/10.1139/e99-057.
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Sudbury breccias are commonly attributed to meteoritic impact at about 1.85 Ga in the vicinity of the Sudbury Igneous Complex. In the Whitefish Falls area, about 75 km southwest of Sudbury, similar breccias are widely developed in argillites of the ~2.3 Ga Gowganda Formation. There is abundant evidence of "soft sediment" deformation of the Huronian sediments in the form of complex "fault" contacts, clastic dyke intrusions, and chaotic folding. These movements appear to have been penecontemporaneous with intrusion of highly irregular diabase bodies, which are interpreted as being older than the ~2.2 Ga Nipissing diabase. Complex shapes of diabase bodies and highly irregular contact relationships between diabase and argillites, including intrusions of sediment veins into diabase, support intrusion of the diabase into incompletely consolidated sediments. These data, together with chemical evidence of mixing of diabase, argillite, and other materials in the breccia bodies, suggest that the breccias at Whitefish Falls may have formed as a result of interaction between hot mafic magma and semiconsolidated, water-rich mud, more than 350 Ma prior to formation of the Sudbury Igneous Complex and attendant phenomena that are presumed to be impact related.
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Archambault, Daniel J., and Keith Winterhalder. "Metal tolerance in Agrostis scabra from the Sudbury, Ontario, area." Canadian Journal of Botany 73, no. 5 (May 1, 1995): 766–75. http://dx.doi.org/10.1139/b95-084.
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Acid, metal-contaminated soils are frequently colonized by plant species that have evolved tolerance to metals. Agrostis scabra (tickle grass) grows at several such sites in the Sudbury area. To test whether these populations were tolerant to metals, three experiments were performed. A hydroponic root growth experiment, in which clonal ramets from contaminated and uncontaminated sites were grown in metal-amended nutrient solutions, showed that plants from the Sudbury area had greater tolerance indices than those from outside Sudbury. A seed-based hydroponic experiment, where seeds were germinated in metal solutions, showed that metal-tolerance indices calculated from root growth were mostly greater for populations from Sudbury but that leaf growth was not a good indicator of metal tolerance. A seed-based soil-bioassay experiment, in which seeds were germinated on soils covered with filter paper, showed that seeds from contaminated sites performed better on contaminated soil and a 50:50 soil mixture (contaminated–uncontaminated) than those from uncontaminated sites. Populations of A. scabra growing on contaminated soils in the Sudbury area therefore appear to have been selected for metal tolerance. Ecological aspects of metal tolerance and the possible role of A. scabra in the revegetation of the Sudbury area are discussed. Key words: Agrostis scabra, tolerance, metals, acid soil, contamination.
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Hanley, J. J., and J. E. Mungall. "CHLORINE ENRICHMENT AND HYDROUS ALTERATION OF THE SUDBURY BRECCIA HOSTING FOOTWALL Cu Ni PGE MINERALIZATION AT THE FRASER MINE, SUDBURY, ONTARIO, CANADA." Canadian Mineralogist 41, no. 4 (August 1, 2003): 857–81. http://dx.doi.org/10.2113/gscanmin.41.4.857.
Full textDissertations / Theses on the topic "Breccia – Ontario – Greater Sudbury"
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Lafrenière, Ginette. "Women's community organizing experiences in Sudbury, Ontario : an exploratory look." Thesis, McGill University, 2005. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=85928.
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This qualitative study examines sixteen women's understanding of their experiences in community organizing in a northern urban context. While most front-line community organizing is done by women, there is a paucity of research giving voice to their particular realities. Similarly, there is little information describing community organizing in a northern urban context. The study's conceptual frameworks draw on theory and research from rural and northern social work, activist mothering, feminist social policy, diversity and exclusion, and the social construction of identities. It follows a feminist research paradigm. The study illustrates women community organizers' sense of place and their perceptions of the politics of language, cultural and linguistic tensions, and the influences of northern economic and geographic realities. The research findings demonstrate the processes of community organizing in a northern setting, community organizers' demoralization because of increasingly less generous social policy environments, and the challenges of racial and linguistic divisions in community organizing. The study challenges the urban lens dominating social work education and highlights the legitimacy of community organizing within social work education. It discusses future research possibilities for cross-cultural community organizing involving minority francophone and ethnocultural populations as well as the relativity of notions of oppression within francophone spheres.
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Iles, Alison. "Indirect effects of metal-contamination on energetics of yellow perch (Perca flavescens) in Sudbury area lakes, resulting from food web simplification." Thesis, McGill University, 2003. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=19725.
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Metal-contamination of lakes simplifies food webs and reduces the efficiency of energy transfer to top trophic organisms, such as yellow perch (Perca flavescens). Benthic invertebrate community composition and yellow perch diet, growth and activity levels from lakes along a metal-contamination gradient were used to assess the importance of a naturally diverse prey base for maintaining energy transfer to growing fish, and how this is disrupted by metal-contamination. As perch grow larger, they shift their diet to larger prey; otherwise, the activity costs of foraging for many, small prey, instead of a few large prey, become too high and the fish stop growing. Metal contaminated lakes have less diverse zoobenthic communities, particularly the lack of large bodied invertebrate taxa, forcing perch to rely on smaller benthic prey. Perch from metal-contaminated lakes display slow growth and poor condition during benthivory. Estimates of fish activity, using the activity of the glycolytic enzyme Lactate dehydrogenase in perch white muscle tissue as a proxy, suggest that diet shifts to larger prey lower activity costs and may explain how diet shifts maintain growth efficiency as perch grow larger. Perch from metal-contaminated lakes cannot benefit from the energetic advantages of switching to larger prey and thus exhibit poor growth.
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Goupil, Kassandre. "Effects of Liming on Soil Respiration, Fungi Diversity and Abundance in a Metal-Contaminated Region in Northern Ontario." Thesis, Laurentian University of Sudbury, 2014. https://zone.biblio.laurentian.ca/dspace/handle/10219/2196.
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At present, little is known concerning the fungi communities inhabiting the Greater Sudbury Region. This study aimed at identifying the fungal species and abundance in limed and unlimed areas contaminated with metals. Samples were collected from the LFH soil layer from Wahnapitae Hydro-Dam, Daisy Lake, Kingsway, Kelly Lake, Hagar, Onaping Falls and Capreol. Limed and unlimed areas were compared for soil metals, pH, fungi diversity, abundance and seasonal soil respiration. Fungi from soil samples were cultured using Sabouraud Dextrose Agar and Malt Extract Agar. A total of 52 fungi species from 34 genera were identified. There was a significantly higher fungal diversity in the limed areas compared to the samples from unlimed sites based on SDA medium data. Fungi abundance followed the same trend. Significantly higher soil respiration rates were recorded for limed sites compared to unlimed sites. Summer soil respiration rates correlated (r = 0.50) with total fungal abundance.
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Hall, Heather Mary. "Being Realistic About Planning in No Growth: Challenges, Opportunities, and Foundations for a New Agenda in the Greater Sudbury, CMA." Thesis, 2007. http://hdl.handle.net/10012/3142.
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Regional disparities, most notably of the 'heartland-periphery' pattern, have been a distinctive feature of Canadian urban geography throughout the industrial era. New regimes of economic prosperity, recessions, and restructuring in the post-industrial era coupled with demographic fluctuations have added new and accentuated divisions and disparities creating an increased gap between cities that are growing and not growing. Under these conditions, it seems realistic to expect that no-growth cities might begin to develop distinctive planning strategies centered on a theme of decline or no-growth scenarios. However, this has not been the case. The City of Greater Sudbury is located in North-eastern Ontario and is best known across Canada for its original resource-based ‘boom’, its unsustainable mining practices and subsequent decline. The 21st-Century City of Sudbury has since evolved into a more balanced regional centre. Nonetheless, the population of the City has been fluctuating over the last 30 years, experiencing decline, slow growth, and no-growth scenarios.
The first phase in the research establishes the documentary record of Sudbury’s decline alongside remedial initiatives undertaken at the federal, provincial, and local levels in the general attempt to kick start growth locally and remediate decline. The second phase in the research investigates how those involved in planning and economic development at the grassroots level deal with no growth through key informant interviews with planners, economic developers, consultants, and politicians. The research findings document the contradictory perceptions that surround planning in no-growth locales and further explore the challenges and opportunities associated with no growth urban areas. It concludes with a discussion of what might constitute alternative criteria for a new model of planning and development capable of generating more realistic economic and planning policy and strategy considerations for no growth urban areas and Northeastern Ontario.
Books on the topic "Breccia – Ontario – Greater Sudbury"
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Hanley, Jacob James. Distribution of the halogens in Sudbury breccia matrix as pathfinder elements for footwall Cu-Pge mineralization at the Fraser Cu Zone, Barnet main copper zone, and surrounding margin of the Sudbury igneous complex, Onapine-Levack area, Ontario, Canada. 2002.
Find full textReports on the topic "Breccia – Ontario – Greater Sudbury"
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Legault, D., B. Lafrance, and D. E. Ames. Structural study of Sudbury breccia and sulphide veins, Levack embayment, North Range of the Sudbury structure, Ontario. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2003. http://dx.doi.org/10.4095/214183.
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