Development of symmetrical and asymmetrical fabrics in sheet-like igneous bodies: the role of magma flow and wall-rock displacements in theoretical and natural cases

dc.creatorCorrea-Gomes, LC
dc.creatorSouza, CR
dc.creatorMartins, CJFN
dc.creatorOliveira, EP
dc.date2001
dc.dateSEP
dc.date2014-11-15T10:29:21Z
dc.date2015-11-26T16:10:31Z
dc.date2014-11-15T10:29:21Z
dc.date2015-11-26T16:10:31Z
dc.date.accessioned2018-03-28T22:59:08Z
dc.date.available2018-03-28T22:59:08Z
dc.identifierJournal Of Structural Geology. Pergamon-elsevier Science Ltd, v. 23, n. 9, n. 1415, n. 1428, 2001.
dc.identifier0191-8141
dc.identifierWOS:000169979200007
dc.identifier10.1016/S0191-8141(01)00007-4
dc.identifierhttp://www.repositorio.unicamp.br/jspui/handle/REPOSIP/61632
dc.identifierhttp://www.repositorio.unicamp.br/handle/REPOSIP/61632
dc.identifierhttp://repositorio.unicamp.br/jspui/handle/REPOSIP/61632
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/1266891
dc.descriptionTwo orientations of fabrics are recognised in vertical dykes: a symmetric orientation associated with magma injected into non-deforming wall-rocks and an asymmetric orientation usually associated with external non-coaxial shearing, or magma injected into an active fault. The notion of two fabric arrangements stems from two planes of symmetry, the dyke symmetry plane (DSP) and the fabric symmetry plane (FSP). This paper uses conceptual models to simulate all possible orientations of magma flow indicators that might be produced within a vertical dyke emplaced under coeval internal and external stresses. The effect of magmatic buoyancy-related stresses are portrayed in terms of magma flow velocities (MFV) and the external cion-coaxial tectonic-related stresses in terms of wall displacement velocities divided by two (WMV/2). The tectonic setting is that of a sinistral transcurrent fault. Using these assumptions, five cases are proposed: MFV much greater than WDV/2, MFV > WDV/2, MFV = WDV/2, MFV < WDV/2 and MFV much less than WDV/2. Each of theses cases shows distinct obliquities between the DSP and FSP (to the extent that the latter can be depicted) and distinct angular relations between strikes of dyke walls and fabric ellipsoids. The model was tested on Neoproterozoic alkaline dykes hosted within the Itabuna-Itaju do Colonia Shear Zone (Brazil). Comparisons of what our model predicted with what we observed in the field showed a striking equivalence. (C) 2001 Published by Elsevier Science Ltd.
dc.description23
dc.description9
dc.description1415
dc.description1428
dc.languageen
dc.publisherPergamon-elsevier Science Ltd
dc.publisherOxford
dc.publisherInglaterra
dc.relationJournal Of Structural Geology
dc.relationJ. Struct. Geol.
dc.rightsfechado
dc.rightshttp://www.elsevier.com/about/open-access/open-access-policies/article-posting-policy
dc.sourceWeb of Science
dc.subjectMechanical Interactions
dc.subjectLaccolithic Intrusions
dc.subjectHenry Mountains
dc.subjectSimple Shear
dc.subjectPure Shear
dc.subjectDikes
dc.subjectDifferentiation
dc.subjectDirection
dc.subjectOrientations
dc.subjectDeformation
dc.titleDevelopment of symmetrical and asymmetrical fabrics in sheet-like igneous bodies: the role of magma flow and wall-rock displacements in theoretical and natural cases
dc.typeArtículos de revistas


Este ítem pertenece a la siguiente institución