Non-coaxial K-feldspar and AMS sub-fabrics in the Land's End Granite, Cornwall: evidence of magmatic fabric decoupling during late deformation and matrix crystallization

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Non-coaxial K-feldspar and AMS sub-fabrics in the Land's End Granite, Cornwall: evidence of magmatic fabric decoupling during late deformation and matrix crystallization

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dc.contributor.author Kratinova, Z. en_US
dc.contributor.author Jezek, J. en_US
dc.contributor.author Schulmann, K. en_US
dc.contributor.author Hrouda, F. en_US
dc.contributor.author Shail, R.K. en_US
dc.contributor.author Lexa, O. en_US
dc.date.accessioned 2012-06-27T09:55:36Z en_US
dc.date.accessioned 2012-09-28T18:01:23Z en_US
dc.date.accessioned 2013-03-20T12:57:33Z
dc.date.issued 2010 en_US
dc.description.abstract A comparative study of the anisotropy of magnetic susceptibility (AMS) and K-feldspar phenocryst fabrics in the Land’s End Granite demonstrates that the AMS fabric predominantly reflects late magmatic deformation. Tensor analysis of the K-feldspar fabric shows a complex pattern, characterized by meter-scale variations in orientation, symmetry and intensity, mainly related to heterogeneous flow of the phenocryst-rich magma during emplacement. In contrast, the AMS fabric is predominantly homogenous, subhorizontal and oblate, and is stable at pluton scale. Quantitative microstructural analysis suggests that the AMS fabric is controlled by deformation of the partially crystallized matrix, resulting from the combined effects of late internal adjustment within the pluton and regional deformation. A general model of fabric development associated with a vertical pure-shear overprint on a variable vertical fabric is evaluated by numerical modeling. The study demonstrates how the memory of different fabric elements may be dependent upon their grain size, crystallization sequence and recorded previous strain. en_US
dc.identifier.citation Vol. 115, article B09104 en_US
dc.identifier.doi 10.1029/2009JB006714 en_US
dc.identifier.uri http://hdl.handle.net/10036/3782 en_US
dc.publisher American Geophysical Union (AGU) en_US
dc.relation.url http://dx.doi.org/10.1029/2009JB006714 en_US
dc.subject Anisotropy of magnetic susceptibility (AMS) en_US
dc.subject Magmatic fabric en_US
dc.subject K-feldspar preferred orientation en_US
dc.subject Reflection goniometry en_US
dc.subject Land's End granite en_US
dc.title Non-coaxial K-feldspar and AMS sub-fabrics in the Land's End Granite, Cornwall: evidence of magmatic fabric decoupling during late deformation and matrix crystallization en_US
dc.date.available 2012-06-27T09:55:36Z en_US
dc.date.available 2012-09-28T18:01:23Z en_US
dc.date.available 2013-03-20T12:57:33Z
exeter.article-number B09104 en_US
exeter.contacts.depositing-owner-email Shail, Robin <R.K.Shail@exeter.ac.uk> en_US
exeter.contacts.owner-email Shail, Robin <R.K.Shail@exeter.ac.uk> en_US
dc.description Article en_US
dc.description Reproduced with permission of the publisher. Copyright © 2010 American Geophysical Union en_US
dc.identifier.eissn 2156–2202 en_US
dc.identifier.journal Journal of Geophysical Research - Solid Earth en_GB


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