Mid amphibolite facies metamorphism of harzburgites in the Neoproterozoic Cerro Mantiqueiras Ophiolite, southernmost Brazil
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| Formato: | Artículo científico |
| Lenguaje: | en |
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Academia Brasileira de Ciências
2003
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| _version_ | 1876479897815220224 |
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| author | Farid Chemale |
| author_facet | Farid Chemale |
| contents | Mid amphibolite facies metamorphism of harzburgites in the Neoproterozoic Cerro Mantiqueiras Ophiolite, southernmost Brazil Farid Chemale Léo A. Hartmann Multidisciplinaria (Ciencias Naturales y Exactas) metamorphism Neoproterozoic mineral chemistry Cerro Mantiqueiras Ophiolite Valuable information is retrieved from the integrated investigation of the field relationships, microstructure andmineral compositions of harzburgites from the Neoproterozoic Cerro Mantiqueiras Ophiolite. This importanttectonic marker of the geological evolution of southernmost Brazilian Shield was thoroughly serpentinizedduring progressive metamorphism, because the oldest mineral assemblage is: olivine + orthopyroxene +tremolite + chlorite + chromite. ThisM1 was stabilized in mid amphibolite facies 550-600oC as calculatedfrom mineral equilibria. No microstructural (e.g. ductile deformation of olivine or chromite) or compositional(e.g. mantle spinel) remnant of mantle history was identified. A metamorphic event M2 occurred in the lowamphibolite facies along 100 m-wide shear zones, followed by intense serpentinization (M3) and narrow 1-3m-wide shear zones (M4) containing asbestos. 2003 artículo científico 0001-3765 https://www.redalyc.org/articulo.oa?id=32775112 en http://www.redalyc.org/revista.oa?id=327 Anais da Academia Brasileira de Ciências application/pdf Academia Brasileira de Ciências Anais da Academia Brasileira de Ciências (Brasil) Num.1 Vol.75 |
| format | Artículo científico |
| id | redalyc_32775112 |
| institution | Redalyc |
| language | en |
| publishDate | 2003 |
| publisher | Academia Brasileira de Ciências |
| spellingShingle | Mid amphibolite facies metamorphism of harzburgites in the Neoproterozoic Cerro Mantiqueiras Ophiolite, southernmost Brazil Farid Chemale Multidisciplinaria (Ciencias Naturales y Exactas) metamorphism Neoproterozoic mineral chemistry Cerro Mantiqueiras Ophiolite Mid amphibolite facies metamorphism of harzburgites in the Neoproterozoic Cerro Mantiqueiras Ophiolite, southernmost Brazil Farid Chemale Léo A. Hartmann Multidisciplinaria (Ciencias Naturales y Exactas) metamorphism Neoproterozoic mineral chemistry Cerro Mantiqueiras Ophiolite Valuable information is retrieved from the integrated investigation of the field relationships, microstructure andmineral compositions of harzburgites from the Neoproterozoic Cerro Mantiqueiras Ophiolite. This importanttectonic marker of the geological evolution of southernmost Brazilian Shield was thoroughly serpentinizedduring progressive metamorphism, because the oldest mineral assemblage is: olivine + orthopyroxene +tremolite + chlorite + chromite. ThisM1 was stabilized in mid amphibolite facies 550-600oC as calculatedfrom mineral equilibria. No microstructural (e.g. ductile deformation of olivine or chromite) or compositional(e.g. mantle spinel) remnant of mantle history was identified. A metamorphic event M2 occurred in the lowamphibolite facies along 100 m-wide shear zones, followed by intense serpentinization (M3) and narrow 1-3m-wide shear zones (M4) containing asbestos. 2003 artículo científico 0001-3765 https://www.redalyc.org/articulo.oa?id=32775112 en http://www.redalyc.org/revista.oa?id=327 Anais da Academia Brasileira de Ciências application/pdf Academia Brasileira de Ciências Anais da Academia Brasileira de Ciências (Brasil) Num.1 Vol.75 |
| title | Mid amphibolite facies metamorphism of harzburgites in the Neoproterozoic Cerro Mantiqueiras Ophiolite, southernmost Brazil |
| topic | Multidisciplinaria (Ciencias Naturales y Exactas) metamorphism Neoproterozoic mineral chemistry Cerro Mantiqueiras Ophiolite |
| url | https://www.redalyc.org/articulo.oa?id=32775112 |