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Multiple magmatic fabrics in plutons: an overlooked tool for exploring interactions between magmatic processes and regional deformation?

  • JIŘÍ ŽÁK (a1) (a2), KRYŠTOF VERNER (a2) (a3) and PATRICIE TÝCOVÁ (a4)

This paper elaborates on the concept of multiple magmatic fabrics in plutons. After a general overview of various types of multiple fabrics that may develop in magmatic rocks, two case examples of porphyritic granite and melasyenite plutons in the Bohemian Massif are examined. In the Jizera granite, complex variations in K-feldspar phenocryst shape-fabric revealed by image analysis of a 200 m long section of an underground tunnel are in contrast with homogeneously oriented magnetic (AMS) fabric carried by coaxial contributions of biotite, magnetite and maghemite. In the Knížecí Stolec melasyenite pluton, emplacement-related margin-parallel feldspar foliation was overprinted by flat-lying foliation; the latter is interpreted to record regional tectonic strain. At the two stations examined in detail, the crystallographic-preferred orientation of biotite and amphibole in the inter-phenocryst matrix (measured using electron back-scatter diffraction – EBSD) differed from both feldspar fabric and also from the AMS principal directions. Multiple magmatic fabrics in these two plutons are interpreted in terms of fabric superposition, where late weak strain is superposed onto a high-strength phenocryst framework, but is accommodated preferentially by small mineral grains (biotite, magnetite) in the melt-bearing matrix. This mechanism may explain the discrepancy between mesoscopic feldspar fabric and AMS. We conclude that multiple magmatic fabrics in plutons may thus result from accumulated strain caused by different processes during final crystallization and, as such, may serve as a sensitive indicator of the evolving interactions between magmatic and tectonic processes in the Earth's crust.

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Arbaret L., Fernandez A., Ježek J., Ildefonse B., Launeau P. & Diot H. 2000. Analogue and numerical modelling of shape fabrics: application to strain and flow determination in magmas. Transactions of the Royal Society of Edinburgh: Earth Sciences 90, 97109.
Archanjo C. J., Trindade R. I. F., Bouchez J. L. & Ernesto M. 2002. Granite fabrics and regional-scale strain partitioning in the Seridó belt (Borborema Province, NE Brazil). Tectonics 21, 3/13/14.
Barros C. E. M., Barbey P. & Boullier A. M. 2001. Role of magma pressure, tectonic stress and crystallization progress in the emplacement of syntectonic granites. The A-type Estrela Granite Complex (Carajás Mineral Province, Brazil). Tectonophysics 343, 93109.
Benn K. 1994. Overprinting of magnetic fabrics in granites by small strains – numerical modeling. Tectonophysics 233, 153–62.
Benn K., Paterson S. R., Lund S. P., Pignotta G. S. & Kruse S. 2001. Magmatic fabrics in batholiths as markers of regional strains and plate kinematics: example of the Cretaceous Mt. Stuart batholith. Physics and Chemistry of the Earth 26, 343–54.
Blumenfeld P. & Bouchez J. L. 1988. Shear criteria in granite and migmatite deformed in the magmatic and solid states. Journal of Structural Geology 10, 361–72.
Borradaile G. 2003. Statistics of Earth-Science data. Their distribution in time, space, and orientation. Berlin, Heidelberg, New York: Springer, 351 pp.
Borradaile G. & Henry B. 1997. Tectonic applications of magnetic susceptibility and its anisotropy. Earth-Science Reviews 42, 4993.
Borradaile G. & Kehlenbeck M. 1996. Possible cryptic tectono-magnetic fabrics in ‘post-tectonic’ granitoid plutons of the Canadian Shield. Earth and Planetary Science Letters 137, 119–27.
Bouchez J. L. 1997. Granite is never isotropic: an introduction to AMS studies of granitic rocks. In Granite: From Segregation of Melt to Emplacement Fabrics (eds Bouchez J. L., Hutton D. H. W. & Stephens W. E.), pp. 95112. Kluwer Academic Publishers.
Callahan C. N. & Markley M. J. 2003. A record of crustal-scale stress: igneous foliation and lineation in the Mount Waldo Pluton, Waldo County, Maine. Journal of Structural Geology 25, 541–55.
Cloos H. 1925. Einführung in die tektonische Behandlung magmatischer Erscheinungen (Granittektonik). 1. Das Riesengebirge in Schlesien. Berlin: Borntraeger, 194 pp.
Fernandez A. & Laporte D. 1991. Significance of low symmetry fabrics in magmatic rocks. Journal of Structural Geology 13, 337–47.
Fowler T. K. & Paterson S. R. 1997. Timing and nature of magmatic fabrics from structural relations around stoped blocks. Journal of Structural Geology 19, 209–24.
Gleizes G., Leblanc D., Santana V., Olivier P. & Bouchez J. L. 1998. Sigmoidal structures featuring dextral shear during emplacement of the Hercynian granite complex of Cauterets-Panticosa (Pyrenees). Journal of Structural Geology 20, 1229–45.
Handy M. R. 1994. Flow laws for rocks containing two non-linear viscous phases: a phenomenological approach. Journal of Structural Geology 16, 287301.
Holub F. 1997. Ultrapotassic plutonic rocks of the durbachite series in the Bohemian Massif: petrology, geochemistry, and petrogenetic interpretation. Journal of Geological Sciences, Economic Geology, Mineralogy 31, 526.
Hrouda F. 1982. Magnetic anisotropy of rocks and its application in geology and geophysics. Geophysical Surveys 5, 3782.
Hrouda F. 1994. A technique for the measurement of thermal-changes of magnetic susceptibility of weakly magnetic rocks by the CS-2 apparatus and KLY-2 Kappabridge. Geophysical Journal International 118, 604–12.
Hutton D. H. W. 1982. A tectonic model for the emplacement of the Main Donegal Granite, NW Ireland. Journal of the Geological Society, London 139, 615–31.
Ildefonse B., Arbaret L. & Diot H. 1997. Rigid particles in simple shear flow: is their orientation periodic or steady-state? In Granite: From Segregation of Melt to Emplacement Fabrics (eds Bouchez J. L., Hutton D. H. W. & Stephens W. E.), pp. 177–85. Kluwer Academic Publishers.
Ildefonse B., Launeau P., Bouchez J.-L. & Fernandez A. 1992. Effect of mechanical interactions on the development of shape preferred orientations: a two-dimensional experimental approach. Journal of Structural Geology 14, 7383.
Jackson M. & Tauxe L. 1991. Anisotropy of magnetic susceptibility and remanence: developments in the characterization of tectonic, sedimentary, and igneous fabric. Reviews of Geophysics 29, 371–6.
Janoušek V. & Holub F. 2007. The causal link between HP–HT metamorphism and ultrapotassic magmatism in collisional orogens: case study from the Moldanubian Zone of the Bohemian Massif. Proceedings of the Geologists’ Association 118, 7586.
Jeffery G. B. 1922. The motion of ellipsoidal particles immersed in a viscous fluid. Proceedings of the Royal Society of London 102, 161–79.
Jelínek V. 1981. Characterization of the magnetic fabric of rocks. Tectonophysics 79, 63–7.
Ježek J., Melka R., Schulmann K. & Venera Z. 1994. The behaviour of rigid triaxial ellipsoidal particles in viscous flows – modeling of fabric evolution in a multiparticle system. Tectonophysics 229, 165–80.
Ježek J., Schulmann K. & Segeth K. 1996. Fabric evolution of rigid inclusions during mixed coaxial and simple shear flows. Tectonophysics 257, 203–21.
Jiang D. 2007. Numerical modeling of the motion of rigid ellipsoidal objects in slow viscous flows: a new approach. Journal of Structural Geology 29, 189200.
Klomínský J. (ed.) 2005. Geological and structural characterization of granitoids in water-plant tunnels in the Jizera Mountains. Final report, Radioactive Waste Repository Authority (SÚRAO), Prague, 159 pp.
Kozdrój W., Krentz O. & Opletal M. (eds) 2001. Geological map Lausitz-Jizera-Karkonosze (without Cenozoic sediments), 1:100,000. Sächsisches Landesamt für Umwelt und Geologie, Panstwowy Instytut Geologiczny, Česká geologická služba; Warszaw.
Kratinová Z., Schulmann K., Hrouda F. & Shail R. 2004. The role of regional tectonics and magma flow coupling versus internal magmatic processes in generating contrasting magmatic state fabrics within the Land's End granite. Geoscience in south-west England 10, 442–8.
Launeau P. & Cruden A. R. 1998. Magmatic fabric acquisition in a syenite: results of a combined anisotropy of magnetic susceptibility and image analysis study. Journal of Geophysical Research 103, 5067–89.
Mazur S., Aleksandrowski P., Kryza R. & Oberc-Dziedzic T. 2006. The Variscan Orogen in Poland. Geological Quarterly 50, 89118.
Melka R., Schulmann K., Schulmannová B., Hrouda F. & Lobkowicz M. 1992. The evolution of perpendicular linear fabrics in synkinematically emplaced tourmaline granite (central Moravia-Bohemian Massif). Journal of Structural Geology 14, 605–20.
Memeti V., Paterson S. R., Economos R., Žák J. & Erdmann S. 2005. Deciphering chamber growth and internal magma chamber processes using magmatic lobes as snapshots of processes during the construction of the Tuolumne batholith, Sierra Nevada. Geological Society of America Abstracts with Programs 37, 554.
Nagata T. 1961. Rock magnetism. Tokyo: Maruzen, 350 pp.
Park Y. & Means W. D. 1996. Direct observation of deformation processes in crystal mushes. Journal of Structural Geology 18, 847–58.
Parry M., Štípská P., Schulmann K., Hrouda F., Ježek J. & Kröner A. 1997. Tonalite sill emplacement at an oblique plate boundary: northeastern margin of the Bohemian Massif. Tectonophysics 280, 6181.
Paterson S. R., Fowler T. K., Schmidt K. L., Yoshinobu A. S., Yuan E. S. & Miller R. B. 1998. Interpreting magmatic fabric patterns in plutons. Lithos 44, 5382.
Paterson S. R., Onezime J., Teruya L. & Žák J. 2003. Quadruple-pronged enclaves: their significance for the interpretation of multiple magmatic fabrics in plutons. Journal of the Virtual Explorer 10, 1530.
Paterson S. R., Vernon R. H. & Tobisch O. T. 1989. A review of criteria for identification of magmatic and tectonic foliations in granitoids. Journal of Structural Geology 11, 349–63.
Pitcher W. S. & Berger A. R. 1972. The geology of Donegal: a study of granite emplacement and unroofing. London: Wiley Interscience, 435 pp.
Prior D. J., Boyle A. P., Brenker F., Cheadle M. C., Day A., Lopez G., Peruzzo L., Potts G. J., Reddy S., Spiess R., Timms N. E., Trimby P., Wheeler J. & Zetterström L. 1999. The application of electron backscatter diffraction and orientation contrast imaging in the SEM to textural problems in rocks. American Mineralogist 84, 1741–59.
Rochette P., Jackson M. & Auborg C. 1992. Rock magnetism and the interpretation of anisotropy of magnetic susceptibility. Reviews of Geophysics 30, 209–26.
Rosenberg C. L. 2001. Deformation of partially molten granite: a review and comparison of experimental and natural case studies. International Journal of Earth Sciences 90, 6076.
Rosenberg C. L. & Handy M. R. 2001. Mechanisms and orientation of melt segregation paths during pure shearing of a partially molten rock analog (norcamphor–benzamide). Journal of Structural Geology 23, 1917–32.
Rosenberg C. L. & Handy M. R. 2005. Experimental deformation of partially melted granite revisited: implications for the continental crust. Journal of Metamorphic Geology 23, 1928.
Schulmann K., Ježek J. & Venera Z. 1997. Perpendicular linear fabrics in granite: markers of combined simple shear and pure shear flows? In Granite: From Segregation of Melt to Emplacement Fabrics (eds Bouchez J. L., Hutton D. H. W. & Stephens W. E.), pp. 159–76. Kluwer Academic Publishers.
Škoda R. & Novák M. 2007. Y, REE, Nb, Ta, Ti-oxide (AB2O6) minerals from REL–REE euxenite-subtype pegmatites of the Třebíč Pluton, Czech Republic; substitutions and fractionation trends. Lithos 95, 4357.
Tarling D. H. & Hrouda F. 1993. The magnetic anisotropy of rocks. London: Chapman and Hall, 217 pp.
Tikoff B. & Greene D. 1997. Stretching lineations in transpressional shear zones: an example from the Sierra Nevada Batholith, California. Journal of Structural Geology 19, 2939.
Verner K., Žák J., Hrouda F. & Holub F. 2006. Magma emplacement during exhumation of the lower- to mid-crustal orogenic root: the Jihlava syenitoid pluton, Moldanubian Unit, Bohemian Massif. Journal of Structural Geology 28, 1553–67.
Verner K., Žák J., Nahodilová R. & Holub F. 2008. Magmatic fabrics and emplacement of the cone-sheet-bearing Knížecí Stolec durbachitic pluton (Moldanubian Unit, Bohemian Massif): implications for mid-crustal reworking of granulitic lower crust in the Central European Variscides. International Journal of Earth Sciences 97, 1933.
Vernon R. H. 2000. Review of microstructural evidence of magmatic and solid-state flow. Electronic Geosciences 5, 123.
Vernon R. H., Johnson S. E. & Melis E. A. 2004. Emplacement-related microstructures in the margin of a deformed pluton: the San Jose tonalite, Baja California, Mexico. Journal of Structural Geology 26, 1867–84.
Vigneresse J. L. & Tikoff B. 1999. Strain partitioning during partial melting and crystallizing felsic magmas. Tectonophysics 312, 117–32.
Willis D. G. 1977. A kinematic model of preferred orientation. Geological Society of America Bulletin 88, 883–94.
Žák J., Paterson S. R. & Memeti V. 2007. Four magmatic fabrics in the Tuolumne batholith, central Sierra Nevada, California (USA): implications for interpreting fabric patterns in plutons and evolution of magma chambers in the upper crust. Geological Society of America Bulletin 119, 184201.
Žák J., Schulmann K. & Hrouda F. 2005. Multiple magmatic fabrics in the Sázava pluton (Bohemian Massif, Czech Republic): a result of superposition of wrench-dominated regional transpression on final emplacement. Journal of Structural Geology 27, 805–22.
Žák J., Vyhnálek B. & Kabele P. 2006. Is there a relationship between magmatic fabrics and brittle fractures in plutons? A view based on structural analysis, anisotropy of magnetic susceptibility and thermo-mechanical modelling of the Tanvald pluton (Bohemian Massif). Physics of the Earth and Planetary Interiors 157, 286310.
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