Correlating magnetic fabrics with finite strain: Comparing results from mudrocks in the Variscan and Appalachian Orogens
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| Format: | Artículo científico |
| Language: | en |
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Universitat de Barcelona
2004
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| author | J. M. Parés |
| author_facet | J. M. Parés |
| contents | Correlating magnetic fabrics with finite strain: Comparing results from mudrocks in the Variscan and Appalachian Orogens J. M. Parés B. A. Van Der Pluijm Ciencias de la Tierra Finite strain Cantabrian Arc Valley and Ridge Province Anisotropy of Magnetic Susceptibility New magnetic anisotropy data from Variscan mudstones collected in the Cantabrian Arc, N Spain constrain thecorresponding strain (shortening). The results are based on our previous study of mudrocks from the Valley andRidge Province (Appalachians) where independent strain quantification of pencil structures permitted a correlationbetween magnetic fabric and tectonic strain. An exponential relationship between the AMS shape parameterT and tectonic shortening was found for the interval of 10-25% shortening: shortening (%)=17*exp(T), relationshipthat appears to be supported by tectonic strains up to 40%. The T parameter describes the shape of themagnetic susceptibility ellipsoid, which in pelitic rocks appears more sensitive to strain than the degree ofanisotropy parameter P (or P). In mudrocks from the Cantabrian Arc a positive correlation between T parameterand deformation intensity, reflected by cleavage domains spacing, is observed. Using the above relationship,we estimate the range of tectonic shortening for the Cantabrian mudstones. The correlation between strain andAMS offers a robust estimate of strain magnitude of 10-40% in weakly to moderately deformed clay-rich rocks,where other strain indicators are often lacking or are poorly preserved. 2004 artículo científico 1695-6133 https://www.redalyc.org/articulo.oa?id=50520303 en http://www.redalyc.org/revista.oa?id=505 Geologica Acta: an international earth science journal application/pdf Universitat de Barcelona Geologica Acta: an international earth science journal (España) Num.3 Vol.2 |
| format | Artículo científico |
| id | redalyc_50520303 |
| institution | Redalyc |
| language | en |
| publishDate | 2004 |
| publisher | Universitat de Barcelona |
| spellingShingle | Correlating magnetic fabrics with finite strain: Comparing results from mudrocks in the Variscan and Appalachian Orogens J. M. Parés Ciencias de la Tierra Finite strain Cantabrian Arc Valley and Ridge Province Anisotropy of Magnetic Susceptibility Correlating magnetic fabrics with finite strain: Comparing results from mudrocks in the Variscan and Appalachian Orogens J. M. Parés B. A. Van Der Pluijm Ciencias de la Tierra Finite strain Cantabrian Arc Valley and Ridge Province Anisotropy of Magnetic Susceptibility New magnetic anisotropy data from Variscan mudstones collected in the Cantabrian Arc, N Spain constrain thecorresponding strain (shortening). The results are based on our previous study of mudrocks from the Valley andRidge Province (Appalachians) where independent strain quantification of pencil structures permitted a correlationbetween magnetic fabric and tectonic strain. An exponential relationship between the AMS shape parameterT and tectonic shortening was found for the interval of 10-25% shortening: shortening (%)=17*exp(T), relationshipthat appears to be supported by tectonic strains up to 40%. The T parameter describes the shape of themagnetic susceptibility ellipsoid, which in pelitic rocks appears more sensitive to strain than the degree ofanisotropy parameter P (or P). In mudrocks from the Cantabrian Arc a positive correlation between T parameterand deformation intensity, reflected by cleavage domains spacing, is observed. Using the above relationship,we estimate the range of tectonic shortening for the Cantabrian mudstones. The correlation between strain andAMS offers a robust estimate of strain magnitude of 10-40% in weakly to moderately deformed clay-rich rocks,where other strain indicators are often lacking or are poorly preserved. 2004 artículo científico 1695-6133 https://www.redalyc.org/articulo.oa?id=50520303 en http://www.redalyc.org/revista.oa?id=505 Geologica Acta: an international earth science journal application/pdf Universitat de Barcelona Geologica Acta: an international earth science journal (España) Num.3 Vol.2 |
| title | Correlating magnetic fabrics with finite strain: Comparing results from mudrocks in the Variscan and Appalachian Orogens |
| topic | Ciencias de la Tierra Finite strain Cantabrian Arc Valley and Ridge Province Anisotropy of Magnetic Susceptibility |
| url | https://www.redalyc.org/articulo.oa?id=50520303 |