Abstract
The Santa Lucia Shear Zone (SLSZ, Corsica) is a granulite-facies Permian shear zone that developed after the emplacement of a deep-seated gabbroic intrusion. New structural data shows that the SLSZ results from the juxtaposition of three spatially distinct mylonite belts, which are the product of the interaction between magmatism, metamorphism and shearing over a temperature range from ~800 to ~400°C. During the earlier high-grade deformation stage, which was accompanied by decompression from ~7 to ~5 kb at ~800°C, the SLSZ has accommodated high finite strain on a shear zone ≥1 km wide. Strain became increasingly localized as temperature decreased, but rather than reactivating pre-existing shear zones as commonly expected, younger mylonites expanded into previously unsheared rock, extending the total width of the shear zone. The zonation of different fabrics across the SLSZ suggests that pre-existing compositional and grain size heterogeneities in the starting material played a key role in governing superposed generations of shear zones.
Similar content being viewed by others
References
Altenberger U (1997) Strain localization mechanisms in deep-seated layered rocks. Geol Rundsch 86:56–68. doi:10.1007/s005310050121
Amaudric Du Chaffaut S, Saliot P (1979) La région de Corte: secteur clé pour la compréhension du métamorphisme alpin en Corse. Bull Soc Geol Fr 21:149–154
Anderson JL, Smith DR (1995) The effects of temperature and fO2 on the Al-in-hornblende barometer. Am Mineral 80:549–559
Arthaud F, Matte P (1977) Détermination de la position initiale de la Corse et de la Sardaigne à la fin de l’orogenèse hercynienne grâce aux marqueurs géologiques antémésozoiques. Bull Soc Geol Fr 19:833–840
Beach A (1986) A deep seismic reflection profile across the northern North Sea. Nature 323:53–55. doi:10.1038/323053a0
Beaumont C, Jamieson RA, Nguyen MH, Lee B (2001) Himalayan tectonics explained by extrusion of a low-viscosity channel coupled to focused surface denudation. Nature 414:738–742. doi:10.1038/414738a
Berger A, Stünitz H (1996) Deformation mechanisms and reactions of hornblende: examples from the Bergell tonalite (Central Alps). Tectonophysics 257:149–174. doi:10.1016/0040-1951(95)00125-5
Berman RG (2007) WinTWQ (version 2.3): a software package for performing internally-consistent thermobarometric calculations. Geological Survey of Canada, Open File 5462
Berman RG, Aranovich LY (1996) Optimized standard state and solution properties of minerals. 1. Model calibration for olivine, orthopyroxene, cordierite, garnet, ilmenite in the system FeO–MgO–CaO–Al2O3–TiO2–SiO2. Contrib Mineral Petrol 126:1–24. doi:10.1007/s004100050232
Berman RG, Aranovich LY, Rancourt DG, Mercier PHJ (2007) Reversed phase equilibrium constraints on the stability of Mg–Fe–Al biotite. Am Mineral 92:139–150. doi:10.2138/am.2007.2051
Bird P (1991) Lateral extrusion of lower crust from under high topography, in the isostatic limit. J Geophys Res 96:10275–10286. doi:10.1029/91JB00370
Block L, Royden LH (1990) Core complex geometries and regional scale flow in the lower crust. Tectonics 9:557–567. doi:10.1029/TC009i004p00557
Blumenfeld P, Mainprice D, Bouchez JL (1986) C-slip in quartz from subsolidus deformed granite. Tectonophysics 127:97–115. doi:10.1016/0040-1951(86)90081-8
Bonin B, Azzouni-Sekkal A, Bussy F, Ferrag S (1998) Alkalicalcic and alkaline postorogenic (PO) granite magmatism: petrologic constraints and geodynamic settings. Lithos 45:45–70. doi:10.1016/S0024-4937(98)00025-5
Bouchez JL, Lister GS, Nicolas A (1983) Fabric asymmetry and shear sense in movement zones. Geol Rundsch 72:401–419. doi:10.1007/BF01822075
Bouchez JL, Delas C, Gleizes G, Nédélec A, Cuney M (1992) Submagmatic microfractures in granites. Geology 20:35–38. doi:10.1130/0091-7613(1992)020<0035:SMIG>2.3.CO;2
Brodie KH, Rutter E (1987) Deep crustal extensional faulting in the Ivrea Zone of Northern Italy. Tectonophysics 140:193–212. doi:10.1016/0040-1951(87)90229-0
Brown M (1994) The generation, segregation, ascent and emplacement of granite magma: the migmatite-to-crustally-derived granite connection in thickened orogens. Earth Sci Rev 36:83–130. doi:10.1016/0012-8252(94)90009-4
Brown M (2001) Orogeny, migmatites and leucogranites: a review. In: Proceedings of the Indian academy of sciences, earth and planetary sciences 110:313–336
Bucher K, Frey M (2003) Petrogenesis of metamorphic rocks, Seventh edition. Springer, Heidelberg
Buck WR (1991) Modes of continental lithospheric extension. J Geophys Res 96:20161–20178. doi:10.1029/91JB01485
Burg JP, Vanderhaeghe O (1993) Structures and way-up criteria in migmatites, with application to the Velay Dome (French Massif Central). J Struct Geol 26:1293–1301. doi:10.1016/0191-8141(93)90103-H
Caby R, Jacob C (2000) La transition croute-manteau dans la nappe de Santa-Lucia di Mercurio (Corse Alpine): les racines d’un rift Permien. Geol Fr 1:21–34
Coward MP (1984) Major shear zones in the Precambrian crust: examples from NW Scotland and southern Africa and their significance. In: Kröner A, Greiling R (eds) Precambrian tectonics illustrated. Schweitzerbart, Stuttgart, pp 207–235
Duguet M, Faure M (2004) Granitoid emplacement during a thrusting event: structural analysis, microstructure and quartz c-axis patterns. An example from Hercynian plutons in the French Massif. J Struct Geol 26:927–945. doi:10.1016/j.jsg.2003.09.005
Durand Delga M (1984) Principaux traits de la Corse Alpine et corrélations avec les Alpes Ligures. Mem Soc Geol Ital 28:285–329
Dymek RF (1983) Titanium, aluminium and interlayer cation substitutions in biotite from high-grade gneisses, West Greenland. Am Mineral 68:880–899
Egal E (1992) Structures and tectonic evolution of the external zone of Alpine Corsica. J Struct Geol 14:1215–1228. doi:10.1016/0191-8141(92)90071-4
Elter F, Pandeli E (2005) Structural-metamorphic correlations between three Variscan segments in Southern Europe: Maures Massif (France), Corsica (France)-Sardinia (Italy), and Northern Apennines (Italy). In: Carosi R, Dias R, Iacopini D, Rosenbaum G (eds) The southern Variscan belt. J Virtual Expl, Electronic Edition, ISSN 1441-8142, vol 19, Paper 1
Fuhrman ML, Lindsley DH (1988) Ternary-feldspar modeling and thermometry. Am Mineral 73:201–215
Gans PB (1987) An open system, two-layer crustal stretching model for the eastern great basin. Tectonics 6:1–12. doi:10.1029/TC006i001p00001
Gapais D (1989) Shear structures within deformed granites: mechanical and thermal indicators. Geology 17:1144–1147. doi:10.1130/0091-7613(1989)017<1144:SSWDGM>2.3.CO;2
Gapais D, Barbarin B (1986) Quartz fabric transition in a cooling syntectonic granite (Hermitage Massif, France). Tectonophysics 125:357–370. doi:10.1016/0040-1951(86)90171-X
Garbutt JM, Teyssier C (1991) Prism <c> slip in the quartzites of the Oakhurst Mylonite Belt, California. J Struct Geol 13:657–666. doi:10.1016/0191-8141(91)90028-H
Gessner K, Wijns C, Moresi L (2007) Significance of strain localization in the lower crust for structural evolution and thermal history of metamorphic core complexes. Tectonics 26. doi:10.1029/2004TC001768
Goleby BR, Shaw RD, Wright C, Kennett BLN, Lambeck K (1988) Geophysical evidence for “thick-skinned” crustal deformation in central Australia. Nature 337:325–337. doi:10.1038/337325a0
Hobbs BE (1968) Recrystallization of single crystal of quartz. Tectonophysics 6:353–401. doi:10.1016/0040-1951(68)90056-5
Holdsworth RE, Butler CA, Roberts AM (1997) The recognition of reactivation during continental deformation. J Geol Soc London 154:73–78. doi:10.1144/gsjgs.154.1.0073
Holdsworth RE, Hand M, Miller JA, Buick IS (2001) Continental reactivation and reworking: an introduction. In: Miller JA, Holdsworth RE, Buick IS, Hand M (eds) continental reactivation and reworking. Geol Soc London, special publication 184:1–12
Jackson J (2002) Strength of the continental lithosphere; time to abandon the jelly sandwich? GSA Today 12:4–10. doi:10.1130/1052-5173(2002)012<0004:SOTCLT>2.0.CO;2
Ji S, Mainprice D (1990) Recrystallization and fabric development in plagioclase. J Geol 98:65–79
Koster van Groos AF, Ter Heege JP (1973) The high-low quartz transition up to 10 kilobars pressure. J Geol 81:717–724
Kretz R (1983) Symbols for rock-forming minerals. Am Mineral 68:277–279
Kruhl JH (1996) Prism- and basal-plane parallel subgrain boundaries in quartz: a microstructural geothermobarometer. J Metamorph Geol 14:581–589. doi:10.1046/j.1525-1314.1996.00413.x
Kruhl JH, Peternell M (2002) The equilibration of high-angle grain boundaries in dynamically recrystallized quartz: the effect of crystallography and temperature. J Struct Geol 24:1125–1137. doi:10.1016/S0191-8141(01)00096-7
Lardeaux JM, Spalla MI (1991) From granulites to eclogites in the Sesia zone (Italian Western Alps): a record of the opening and closure of the Piedmont ocean. J Metamorph Geol 9:35–59. doi:10.1111/j.1525-1314.1991.tb00503.x
Law RD, Schmid SM, Wheeler J (1990) Simple shear deformation and quartz crystallographic fabric: a possible natural example from the Torridon area of NW Scotland. J Struct Geol 12:29–45. doi:10.1016/0191-8141(90)90046-2
Ledru P, Courrioux G, Dallain C, Lardeaux JM, Montel JM, Vanderhaeghe O, Vitel G (2001) The Velay dome (French Massif Central): melt generation and granite emplacement during orogenic evolution. Tectonophysics 342:207–237. doi:10.1016/S0040-1951(01)00165-2
Libourel G (1985) Le complexe de Santa Lucia di Mercurio (Corse). Ph.D. thesis, University of Toulouse, p 405
Libourel G (1988) Le complexe de Santa Lucia di Mercurio (Corse): un nouveau jalon de la base de la croute varisique en méditerranée occidentale. C R Acad Sci Paris 307:1067–1073
Lisle RJ (1985) The effect of composition and strain on quartz–fabric intensity in pebbles from a deformed conglomerate. Geol Rundsch 74:657–663. doi:10.1007/BF01821219
Lister GS (1977) Discussion: crossed girdle c-axis fabric in quartzites plastically deformed by plane strain and progressive simple shear. Tectonophysics 39:51–54. doi:10.1016/0040-1951(77)90087-7
Lister GS, Dornsiepen UF (1982) Fabric transition in the Saxony granulite terrain. J Struct Geol 4:81–92. doi:10.1016/0191-8141(82)90009-8
Mainprice DH, Bouchez JL, Blumenfeld P, Tubia JM (1986) Dominant c slip in naturally deformed quartz: implications for dramatic plastic softening at high temperature. Geology 14:819–822. doi:10.1130/0091-7613(1986)14<819:DCSIND>2.0.CO;2
Malavieille J, Guihot P, Costa S, Lardeaux JM, Gardien V (1990) Collapse of the thickened Variscan crust in the French Massif Central: Mont Pilat extensional shear zone and St. Etienne Late Carboniferous basin. Tectonophysics 177:139–149. doi:10.1016/0040-1951(90)90278-G
Malavieille J, Chemenda A, Larroque C (1998) Evolutionary model for Alpine Corsica: mechanism for ophiolite emplacement and exhumation of high-pressure rocks. Terra Nova 10:317–322. doi:10.1046/j.1365-3121.1998.00208.x
Marroni M, Molli G, Montanini A, Tribuzio R (1998) The association of continental crust rocks with ophiolites in the Northern Apennines (Italy): implications for the continent–ocean transition in the Western Tethys. Tectonophysics 292:43–66. doi:10.1016/S0040-1951(98)00060-2
Massonne HJ, Szpurska Z (1997) Thermodynamic properties of white micas on the basis of high-pressure experiments in the system K2O–MgO–Al2O3–SiO2–H2O. Lithos 41:229–250. doi:10.1016/S0024-4937(97)82014-2
Mattauer M, Faure M, Malavieille J (1981) Transverse lineation and large-scale structures related to Alpine obduction in Corsica. J Struct Geol 4:401–409. doi:10.1016/0191-8141(81)90040-7
McKenzie D, Nimmo F, Jackson JA, Gans PB, Miller EL (2000) Characteristics and consequences of flow in the lower crust. J Geophys Res 105:11029–11046. doi:10.1029/1999JB900446
Meissner R, Mooney W (1998) Weakness of the lower continental crust: a condition for delamination, uplift, and escape. Tectonophysics 296:47–60. doi:10.1016/S0040-1951(98)00136-X
Molli G, Tribuzio R, Marquer D (2006) Deformation and metamorphism at the eastern border of the Tenda Massif (NE Corsica): a record of subduction and exhumation of continental crust. J Struct Geol 28:1748–1766. doi:10.1016/j.jsg.2006.06.018
Müntener O, Hermann J, Trommsdorff V (2000) Cooling history and exhumation of lower-crustal granulite and upper mantle (Malenco, Eastern Central Alps). J Petrol 41:175–200. doi:10.1093/petrology/41.2.175
Nelson KD, Zhao W, Brown LD et al (1996) Partially molten middle crust beneath southern Tibet: synthesis of project INDEPTH results. Science 274:1684–1687
Neves SP, Vauchez A, Archanjo CJ (1996) Shear zone-controlled magma emplacement or magma-assisted nucleation of shear zones? Insights from northeast Brazil. Tectonophysics 262:349–364. doi:10.1016/0040-1951(96)00007-8
Ord A, Hobbs BE (1989) The strength of the continental crust, detachment zones and the development of plastic instabilities. Tectonophysics 158:269–289. doi:10.1016/0040-1951(89)90328-4
Paquette JL, Ménot RP, Pin C, Orsini JP (2003) Episodic and short-lived granitic pulses in a post-collisional setting: evidence from precise U-Pb zircon dating through a crustal cross-section in Corsica. Chem Geol 14148:1–20. doi:10.1016/S0009-2541(02)00401-1
Passchier CW, Trouw RAJ (2005) Microtesctonics, Second edition. Springer, Heidelberg
Passchier CW, Myers JS, Kroner A (1990) Field geology of high-grade gneiss terrains. Springer, Heidelberg
Paterson SR, Vernon RH, Tobisch OT (1989) A review of criteria for the identifications of magmatic and tectonic foliations in granitoids. J Struct Geol 11:349–363. doi:10.1016/0191-8141(89)90074-6
Paterson SR, Fowler TK Jr, Schmidt KL, Yoshinobu AS, Yuan ES, Miller RB (1998) Interpreting magmatic fabric patterns in plutons. Lithos 44:53–82. doi:10.1016/S0024-4937(98)00022-X
Pennacchioni G, Mancktelow NS (2007) Nucleation and initial growth of a shear zone network within compositionally and structurally heterogeneous granitoids under amphibolite facies conditions. J Struct Geol 29:1757–1780. doi:10.1016/j.jsg.2007.06.002
Peybernès B, Durand-Delga M, Cugny P (2001) Reconstitution, en Corse, au Jurassique moyen supérieur, de la marge européenne de l’océan Liguro-Piémontais, grâce à des niveaux repères à Praekurnubia crusei (foraminifère). C R Acad Sci Paris 332:499–506
Quick J, Sinigoi S, Negrini L, Demarchi G, Mayer A (1992) Synmagmatic deformation in the underplated igneous complex of the Ivrea-Verbano Zone. Geology 20:613–616. doi:10.1130/0091-7613(1992)020<0613:SDITUI>2.3.CO;2
Ranalli G, Murphy DC (1987) Rheological stratification of the lithosphere. Tectonophysics 132:281–295. doi:10.1016/0040-1951(87)90348-9
Rebay G, Spalla MI (2001) Emplacement at granulite facies conditions of the Sesia-Lanzo metagabbros: an early record of Permian rifting? Lithos 58:85–104. doi:10.1016/S0024-4937(01)00046-9
Regenauer-Lieb K, Weinberg RF, Rosenbaum G (2006) The effect of energy feedbacks on continental strength. Nature 442:67–70. doi:10.1038/nature04868
Rey P, Vanderhaeghe O, Teyssier C (2001) Gravitational collapse of continental lithosphere: definition, regimes, and modes. Tectonophysics 342:435–444. doi:10.1016/S0040-1951(01)00174-3
Rosenberg CL, Handy M (2005) Experimental deformation of partially melted granite revisited: implications for the continental crust. J Metamorph Geol 23:19–28. doi:10.1111/j.1525-1314.2005.00555.x
Rosenberg CL, Stünitz H (2003) Deformation and recrystallization of plagioclase along a temperature gradient. The example of the Bergell tonalite. J Struct Geol 25:391–410. doi:10.1016/S0191-8141(02)00036-6
Rosenberg C, Medvedev S, Handy MR (2007) On the effects of melting on faulting and continental deformation. In: Handy MR, Hirth G, Hovius N (eds) Dahlem Workshop Report 95. Tectonic faults—agents of change on a dynamic earth. The MIT Press, Cambridge, pp 357–401
Ross JV, Wilks KR (1996) Microstructure development in an experimentally sheared orthopyroxene granulite. Tectonophysics 256:83–100. doi:10.1016/0040-1951(95)00168-9
Rossi P, Cocherie A, Fanning CM, Deloule E (2006) Variscan to Eo-Alpine events recorded in European lower-crust zircons sampled from the French Massif Central and Corsica, France. Lithos 87:235–260. doi:10.1016/j.lithos.2005.06.009
Rutter EH, Brodie KH, Evans PJ (1993) Structural geometry, lower crustal magmatic underplating and lithospheric stretching in the Ivrea-Verbano zone, northern Italy. J Struct Geol 15:647–662. doi:10.1016/0191-8141(93)90153-2
Sawyer EW (1999) Criteria for the recognition of partial melting. Phys Chem Earth 24:269–279. doi:10.1016/S1464-1895(99)00029-0
Schilling FR, Partzsch GM, Brasse H, Schwarz G (1997) Partial melting below the magmatic arc in the central Andes deduced from geoelectromagnetic field experiments and laboratory data. Phys Earth Pl Int 103:17–31. doi:10.1016/S0031-9201(97)00011-3
Schuster R, Stüwe K (2008) Permian metamorphic event in the Alps. Geology 36:603–606. doi:10.1130/G24703A.1
Simpson GDH, Thompson AB, Connolly JAD (2000) Phase relations, singularities and thermobarometry of metamorphic assemblages containing phengite, chlorite, biotite, K-feldspar, quartz and H2O. Contrib Mineral Petrol 139:555–569. doi:10.1007/s004100000154
Spear FS (1993) Metamorphic phase equilibria and pressure–temperature–time paths. In: Ribbe PH (ed) Mineralogical Society of America-Monograph Series. Mineralogical Society of America, Washington, p 799
Speranza F, Villa IM, Sagnotti L, Florindo F, Cosentino D, Cipollari P, Mattei M (2002) Age of the Corsica-Sardinia rotation and Ligure-Provencal Basin spreading: new paleomagnetic and Ar/Ar evidence. Tectonophysics 347:231–251. doi:10.1016/S0040-1951(02)00031-8
Starkey J, Cutforth C (1978) A demonstration of the interdependence of the degree of quartz preferred orientation and the quartz content of deformed rocks. Can J Earth Sci 15:841–847
Stipp M, Stünitz H, Heilbronner R, Schmid SM (2002) The eastern Tonale fault zone: a “natural laboratory” for crystal plastic deformation of quartz over a temperature range of 250 to 700°C. J Struct Geol 24:1861–1884. doi:10.1016/S0191-8141(02)00035-4
Tobisch OT, Paterson SR, Saleeby JB, Geary EE (1989) Nature and timing of deformation in the Foothills terrane, central Sierra Nevada, California: its bearing on orogenesis. Geol Soc Am Bull 101:401–413. doi:10.1130/0016-7606(1989)101<0401:NATODI>2.3.CO;2
Tullis J, Yund RA (1987) Transition from cataclastic flow to dislocation creep of feldspar: mechanisms and microstructures. Geology 15:606–609. doi:10.1130/0091-7613(1987)15<606:TFCFTD>2.0.CO;2
Urai JL, Means WD, Lister GS (1986) Dynamic recrystallization of minerals. In: Hobbs BE, Heard HD (eds) Mineral and rock deformation: laboratory studies. Geophysical Monograph, vol 36. pp 161–199
Vanderhaeghe O, Teyssier C (2001) Partial melting and flow of orogens. Tectonophysics 342:451–472. doi:10.1016/S0040-1951(01)00175-5
Vauchez A, Neves SP, Tommasi A (1997) Transcurrent shear zones and magma emplacement in Neoproterozoic belts of Brazil. In: Bouchez J-L, Hutton DHW, Stephens WE (eds) Granite: from segregation of melt to emplacement fabrics. Kluwer, Dordrecht, pp 275–293
Vernon RH (2000) Review of microstructural evidence of magmatic and solid-state flow. Elect Geosci 5:2
Vernon RH, Flood RH (1988) Contrasting deformation of S- and I-type granitoids in the Lachlan fold belt, eastern Australia. Tectonophysics 147:127–143. doi:10.1016/0040-1951(88)90152-7
Vissers RLM, Drury MR, Hoogerduijn Straing EH, Van Der Wal D (1991) Shear zone in the upper mantle: a case study in Alpine lherzolite massif. Geology 19:990–993. doi:10.1130/0091-7613(1991)019<0990:SZITUM>2.3.CO;2
Voll G (1960) New work on petrofabrics. Liverp Manch Geol J 2:503–567
Waters-Tormey C, Tikoff B (2007) Characteristics of a kilometer-scale high strain zone in the lower continental crust: Mt. Hay block, central Australia. J Struct Geol 29:562–582. doi:10.1016/j.jsg.2006.10.011
White JC, Mawer CK (1986) Extreme ductility of feldspars from a mylonite, Parry Sound, Canada. J Struct Geol 8:133–143. doi:10.1016/0191-8141(86)90104-5
White SH, Bretan PG, Rutter EH (1986) Fault-zone reactivation: kinematics and mechanisms. Philos Trans R Soc Lond A 317:81–97. doi:10.1098/rsta.1986.0026
Williams PF, Jiang D (2005) An investigation of lower crustal deformation: evidence for channel flow and its implications for tectonics and structural studies. J Struct Geol 27:1486–1504. doi:10.1016/j.jsg.2005.04.002
Zibra I (2006) Late-Hercynian granitoid plutons emplaced along a deep crustal shear zone. A case study from the S. Lucia Nappe (Alpine Corsica, France). Ph.D. thesis, University of Pisa (Italy); p 204. The complete manuscript is available from: http://etd.adm.unipi.it/theses/available/etd-09142006-171856/
Acknowledgments
Data contained in this work originate from a portion of I. Zibra PhD thesis that benefited from a very detailed review by Claudio Rosenberg who kindly provided a preprint of his work. I. Zibra thanks G. Molli, A. Montanini, R. Tribuzio and B. E. Hobbs for stimulating discussions during various stages of this work. R. F. Weinberg and O. Vanderhaeghe provided useful comments and suggestions that improved the original submitted manuscript. Quartz c-axis determinations were carried out on a Futron™ automated universal stage at the Tectonics and Material Fabrics Section, Technische Universität München.
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Zibra, I., Kruhl, J.H. & Braga, R. Late Palaeozoic deformation of post-Variscan lower crust: shear zone widening due to strain localization during retrograde shearing. Int J Earth Sci (Geol Rundsch) 99, 973–991 (2010). https://doi.org/10.1007/s00531-009-0441-5
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s00531-009-0441-5