Deformational History of Archean Metasedimentary Rocks of the Beartooth Mountains in the Vicinity of the Mineral Hill Mine, Jardine, Montana
| Autor: | Timothy B. Holst, Joseph D. Jablinski |
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| Rok vydání: | 1992 |
| Předmět: | |
| Zdroj: | The Journal of Geology. 100:561-578 |
| ISSN: | 1537-5269 0022-1376 |
| Popis: | Archean metasedimentary rocks of the South Snowy Block of the Beartooth Mountains, in the vicinity of Jardine, Montana, consist predominantly of schistose rocks (interpreted as metamorphosed turbidities) with rare iron formation. These rocks are intruded by Precambrian granitic stocks and minor mafic dikes and sills. Evidence for three phases of folding and late-stage kinking is found within the metasedimentary rocks, whereas rocks of the Crevice Mountain stock (2700 Ma) are unaffected by any of these events. The first folding event involved the development of isoclinal, recumbent folds of varying scale. F₁ fold hinges are rare, most commonly observed underground in Mineral Hill. An S₁ schistosity has developed axial planar to these folds. This schistosity, which is subparallel to bedding, is very well developed and ubiquitous in the metasedimentary rocks of the Jardine region. Large scale F₁ folds are inferred from the pattern of occurrence of iron formation within drill cores and because of the ubiquito... |
| Databáze: | OpenAIRE |
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