Journal of

GEOsciences

  (Formerly Journal of the Czech Geological Society)

Original paper

Gbambie Isaac Bertrand Mbowou, Nilson Francisquini Botelho, Ismaïla Ngounouno

Geochemistry of Mn-bearing rocks hosted in rhyolites from Hadjer Bigli (SE Lake Chad, Cameroon Line): preliminary results

Journal of Geosciences, volume 60 (2015), issue 3, 163 - 170

DOI: http://doi.org/10.3190/jgeosci.194

Braun JJ, Pagel M, Muller JP, Bilong P, Michard A, Guillet B (1990) Cerium anomalies in lateritic profiles. Geochim Cosmochim Acta 54: 781-795
http://doi.org/10.1016/0016-7037(90)90373-S

Braun JJ, Viers J, Dupré B, Polve M, Ndam J, Muller JP (1998) Solid/liquid REE fractionation in the lateritic system of Goyoum, East Cameroon: the implication for the present dynamics of the soil covers of the humid tropical regions. Geochim Cosmochim Acta 62: 273-299
http://doi.org/10.1016/S0016-7037(97)00344-X

De Carlo EH (1991) Paleooceanographic implications of rare earth element variability within a Fe-Mn crust from central Pacific Ocean. Mar Geol 98: 449-467
http://doi.org/10.1016/0025-3227(91)90116-L

Déruelle B, Ngounouno I, Demaiffe D (2007) The ‘‘Cameroon Hot Line’’ (CHL): a unique example of active alkaline intraplate structure in both oceanic and continental lithospheres. C R Geosci 339: 589-600
http://doi.org/10.1016/j.crte.2007.07.007

El-Hasan T, Al-Malabeh A, Komuro K (2008) Rare Earth Elements geochemistry of the Cambrian shallow marine manganese deposit at Wadi Dana, south Jordan. JJEES 1: 45-52

Ganwa AA, Doumnang MJC, Lagmet C (2009) Pétrographie et données structurales sur les dômes rhyolitiques du sud du Lac Tchad (Dandi-Hadjer El Hamis): relation avec la Ligne du Cameroun. Rev Cames 08: 80-85

Grasselly G, Ponater G (1988) Rare Earth Elements in the manganese deposit of Urkurt (Bakony Mountains, Hungary). Ore Geol Rev 4: 115-124
http://doi.org/10.1016/0169-1368(88)90007-8

Isseini M, André-Mayer A-S, Vanderhaeghe O, Barbey P, Deloule E (2012) A-type granites from the Pan-African orogenic belt in south-western Chad constrained using geochemistry, Sr-Nd isotopes and U-Pb geochronology. Lithos 153: 39-52
http://doi.org/10.1016/j.lithos.2012.07.014

Kasser MY (1995) Evolution précambrienne de la région du Mayo Kebbi (Tchad). Un segment de la Chaîne Panafricaine. Unpublished Ph.D. thesis, Muséum d‘Histoire Naturelle de Paris, pp 1-217

Koeppenkastrop D, De Carlo EH (1992) Sorption of rare-earth elements from seawater onto synthetic mineral particles: an experimental approach. Chem Geol 95: 251-263
http://doi.org/10.1016/0009-2541(92)90015-W

Kuleshov VN (2011) Manganese deposits: communication 1. Genetic models of manganese ore formation. Lithol Min Resour 46: 473-493
http://doi.org/10.1134/S0024490211050038

Laveuf C, Cornu S (2009) A review on the potentiality of rare earth elements to trace pedogenetic processes. Geoderma 154: 112
http://doi.org/10.1016/j.geoderma.2009.10.002

Loganathan P, Burau RG (1973) Sorption of heavy metal ions by a hydrous manganese oxide. Geochim Cosmochim Acta 37: 1277-1293
http://doi.org/10.1016/0016-7037(73)90061-6

Louis P (1970) Contribution géophysique à la connaissance géologique du bassin du Lac Tchad. ORSTOM report 42: pp 1-311

Mbowou GIB, Lagmet C, Nomade S, Ngounouno I, Déruelle B, Ohnenstetter D (2012) Petrology of the Late Cretaceous peralkaline rhyolites (pantellerite, comendite) from Lake Chad, Central Africa. J Geosci 57: 127-141
http://doi.org/10.3190/jgeosci.118

McDonough WF, Sun SS (1995) The composition of the Earth. Chem Geol 120: 223-253
http://doi.org/10.1016/0009-2541(94)00140-4

Mongelli G, Mameli P, Oggiano G, Sinisi R (2013) Generation of Ce anomalies in SW Sardinian Mn ores. J Geochem Explor 133: 42-49
http://doi.org/10.1016/j.gexplo.2012.10.002

Ohta A, Kawabe I (2001) REE(III) adsorption onto Mn dioxide (δ-MnO₂) and Fe oxyhydroxide: Ce(III) oxidation by δ-MnO₂. Geochim Cosmochim Acta 65: 695-703
http://doi.org/10.1016/S0016-7037(00)00578-0

Polgári M, Gutzmer J (2012) Manganese metallogenesis: introduction to the special issue. Ore Geol Rev 47: 1-4
http://doi.org/10.1016/j.oregeorev.2012.04.002

Vicat J-P, Djoret D, Kadjangara E, Doumnang J-C (2000) Compositions chimiques des argiles de dessiccations des mares semi-permanentes de la ville de N’Djamena. Etude réalisée pour les Services Techniques de la ville de N’Djamena ; Projet CAMPUS 9416400 “La nappe phréatique de la cuvette tchadienne”. Preliminary report LGHG/04/00, N’Djamena pp 1-2

Vicat J-P, Pouclet A, Bellion Y, Doumnang J-C (2002) Les rhyolites hyperalcalines (pantellérites) du lac Tchad. Composition et signification tectonomagmatique. C R Geosci 334: 886891

Grasemann B, Fritz H, Vannay JC (1999) Quantitative kinematic flow analysis from the Main Central Thrust Zone (NW-Himalaya, India): implications for a decelerating strain path and the extrusion of orogenic wedges. J Struct Geol 21: 837-853
http://doi.org/10.1016/S0191-8141(99)00077-2

Hamimi Z, El-Sawy Kel, El-Fakharani A, Matsah M, Shujoon A, El-Shafei M (2014) Neoproterozoic structural evolution of the NE-trending Ad-Damm Shear Zone, Arabian Shield, Saudi Arabia. J Afr Earth Sci 99: 51-63
http://doi.org/10.1016/j.jafrearsci.2013.09.010

Heilbronner R, Tullis J (2006) Evolution of c-axis pole figures and grain size during dynamic recrystallization: results from experimentally sheared quartzite. J Geophys Res 111: doi: 10.1029/2005JB004194
http://doi.org/10.1029/2005JB004194

Hirth G, Tullis J (1992) Dislocation creep regimes in quartz aggregates. J Struct Geol 21: 1603-1614
http://doi.org/10.1016/0191-8141(92)90053-Y

Hirth G, Teyssier C, Dunlap WJ (2001) An evaluation of quartzite flow laws based on comparisons between experimentally and naturally deformed rocks. Int J Earth Sci 90: 77-87
http://doi.org/10.1007/s005310000152

Holcombe R (2015) Structural Geology - Mapping/GIS Software Geochemical Data Toolkit (GCDkit). Accessed on October 22, 2015, at http://www.holcombe.net.au/software/

Iacopini D, Carosi R, Montomoli C, Passchier CW (2008) Strain analysis and vorticity of flow in the Northern Sardinian Variscan Belt: recognition of a partitioned oblique deformation event. Tectonophysics 446: 77-96
http://doi.org/10.1016/j.tecto.2007.10.002

Jeffreys H (1929) Earth, 2^nd edn. Cambridge University Press, Cambridge, pp 1-346

Jessup MJ, Law RD, Searle MP, Hubbard MS (2006) Structural evolution and vorticity of flow during extrusion and exhumation of the Greater Himalayan Slab, Mount Everest Massif, Tibet/Nepal: implications for orogen-scale flow partitioning. In: Law RD, Searle MP, Godin L (eds) Channel Flow, Ductile Extrusion and Exhumation in Continental Collision Zones. Geological Society London Special Publications 268: 379-414
http://doi.org/10.1144/GSL.SP.2006.268.01.18

Jessup MJ, Law RD, Frassi C (2007) The Rigid Grain Net (RGN): an alternative method for estimating mean kinematic vorticity number (W_m). J Struct Geol 29: 411-421
http://doi.org/10.1016/j.jsg.2006.11.003

Jiang D, White JC (1995) Kinematics of rock flow and the interpretation of geological structures with particular reference to shear zones. J Struct Geol 17: 1249-1266
http://doi.org/10.1016/0191-8141(95)00026-A

Kassem OMK (2014) Kinematic analysis of the Migif area in the Eastern Desert of Egypt. J Struct Geol 99: 136-149
http://doi.org/10.1016/j.jafrearsci.2014.02.002

Kehle RO (1970) Analysis of gravity sliding and orogenic translation. Geol Soc Am Bull 81: 1641- 1664
http://doi.org/10.1130/0016-7606(1970)81[1641:AOGSAO]2.0.CO;2

Klepeis KA, Daczko NR, Clarke GL (1999) Kinematic vorticity and tectonic significance of superposed mylonites in a major lower crustal shear zone, northern Fiordland, New Zealand. J Struct Geol 21: 1385-1405
http://doi.org/10.1016/S0191-8141(99)00091-7

Kruse R, Stünitz H (1999) Deformation mechanisms and phase distribution in mafic high-temperature mylonites from the Jotun Nappe, southern Norway. Tectonophysics 303: 223-249
http://doi.org/10.1016/S0040-1951(98)00255-8

Kurz GA, Northrup CJ (2008) Structural analysis of mylonitic rocks in the Cougar Creek Complex, Oregon-Idaho using the porphyroclast hyperbolic distribution method and potential use of SC’-type extensional shear bands as quantitative vorticity indicators. J Struct Geol 30: 1005-1012
http://doi.org/10.1016/j.jsg.2008.04.003

Langille J, Jessup MJ, Cottle JM, Newell DL (2010) Kinematics of the Ama Drime Detachment: insights into orogen-parallel extension and exhumation of the Ama Drime Massif, Tibet-Nepal. J Struct Geol 32: 900-919
http://doi.org/10.1016/j.jsg.2010.04.005

Law RD (2010) Moine thrust zone mylonites at the stack of Glencoul II: results of vorticity analyses and their tectonic significance. In: Law RD, Butler RWH, Holdsworth R, Krabbendam M, Strachan R (eds) Continental Tectonics and Mountain Building. Geological Society London Special Publications 335: 359-381
http://doi.org/10.1144/SP335.24

Law RD (2014) Deformation thermometry based on quartz c-axis fabrics and recrystallization microstructures: a review. J Struct Geol 66: 129-161
http://doi.org/10.1016/j.jsg.2014.05.023

Law RD, Searle MP, Simpson RL (2004) Strain deformation temperatures and vorticity of flow at the top of the Greater Himalayan Slab, Everest Massif, Tibet. J Geol Soc, London 161: 305-320
http://doi.org/10.1144/0016-764903-047

Law RD, Stahr DW, Francsis M, Ashley KT, Grasemann B, Ahmad T (2013) Deformation temperatures and flow vorticities near the base of the Greater Himalayan Series, Sutlej Valley and Shimla Klippe, NW India. J Struct Geol 54: 21-53
http://doi.org/10.1016/j.jsg.2013.05.009

Lisle RJ (1985) Geological Strain Analysis: A Manual for the R_f/Φ Method. Pergamon Press, New York, pp 1-99

Lloyd GE, Freeman B (1994) Dynamic recrystallization of quartz under greenschist conditions. J Struct Geol 16: 867-881
http://doi.org/10.1016/0191-8141(94)90151-1

Marques FO, Coelho S (2003) 2-D shape preferred orientations of rigid particles in transtensional viscous flow. J Struct Geol 25: 841-854
http://doi.org/10.1016/S0191-8141(02)00089-5

Marques FO, Schmid DW, Anderson TB (2007) Applications of inclusion behaviour models to a major shear zone system: the Nordfjore-Sogen detachment zone in western Norway. J Struct Geol 29: 1622-1631
http://doi.org/10.1016/j.jsg.2007.05.008

Masuda T, Michibayashi K, Ohata H (1995) Shape preferred orientation of rigid particles in a viscous matrix; reevaluation to determine parameters of ductile deformation. J Struct Geol 17: 115-129
http://doi.org/10.1016/0191-8141(94)E0026-U

McQuarrie N, Stock JM, Verdel C, Wernicke BP (2003) Cenozoic evolution of Neotethys and implications for the causes of plate motions. Geophys Res Lett 30: 20-36
http://doi.org/10.1029/2003GL017992

Means WD (1994) Rotational quantities in homogeneous flow and development of small-scale structures. J Struct Geol 16: 437-446
http://doi.org/10.1016/0191-8141(94)90089-2

Mohajjel M, Fergusson C (2000) Dextral transpression in Late Cretaceous continental collision, Sanandaj-Sirjan Zone, western Iran. J Struct Geol 22: 1125-1139
http://doi.org/10.1016/S0191-8141(00)00023-7

Mouthereau F (2011) Timing of uplift in the Zagros belt/Iranian Plateau and accommodation of late Cenozoic Arabia-Eurasia convergence. In: Grasemann B, Simpson G (eds) Geodynamic Evolution of the Zagros. Geol Mag 148: 726-738
http://doi.org/10.1017/S0016756811000306

Mukherjee S (2011) Mineral Fish: their morphological classification, usefulness as shear sense indicators and genesis. Int J Earth Sci 100: 1303-1314
http://doi.org/10.1007/s00531-010-0535-0

Mukherjee S (2012) Simple shear is not so simple! Kinematics and shear senses in Newtonian viscous simple shear zones. Geol Mag 149: 819-826
http://doi.org/10.1017/S0016756811001075

Mukherjee S (2013) Deformation Microstructures in Rocks. Springer, Berlin, pp 1-111
http://doi.org/10.1144/0016-764903-047

Mukherjee S (2014) Atlas of Shear Zone Structures in Meso-scale. Springer, Berlin, pp 1-128
http://doi.org/10.1007/978-3-319-00089-3

Mukherjee S (2015) Atlas of Structural Geology. Elsevier, Amsterdam, pp 1-200

Mukherjee S, Biswas R (2014) Kinematics of horizontal simple shear zones of concentric arcs (Taylor-Couette flow) with incompressible Newtonian rheology. Int J Earth Sci 103: 597-602
http://doi.org/10.1007/s00531-013-0973-6

Mukherjee S, Koyi HA (2010) Higher Himalayan Shear Zone, Zanskar Indian Himalaya: microstructural studies and extrusion mechanism by a combination of simple shear and channel flow. Int J Earth Sci 99: 1083-1110
http://doi.org/10.1007/s00531-009-0447-z

Olsen TS, Kohlstedt DL (1985) Natural deformation and recrystallization of some intermediate plagioclase feldspars .Tectonophysics 111: 107-131
http://doi.org/10.1016/0040-1951(85)90067-8

Passchier CW (1987) Stable positions of rigid objects in non-coaxial flow: a study in vorticity analysis. J Struct Geol 9: 679-690
http://doi.org/10.1016/0191-8141(87)90152-0

Passchier CW (1988) Analysis of deformation paths in shear zones. Geol Rundsch 77: 309-318
http://doi.org/10.1007/BF01848692

Passchier CW, Trouw RAJ (2005) Microtectonics. Springer, Berlin, pp 1-366

Passchier CW, Brink CE, Bons PD, Sokoutis D (1993) σ objects as a gauge for stress sensitivity of strain rate in mylonites. Earth Planet Sci Lett 120: 239-245
http://doi.org/10.1016/0012-821X(93)90242-2

Poli L, Oliver GJH (2001) Constrictional deformation in the Central Zone of the Damara Orogen, Namibia. J Afr Earth Sci 33: 303-321
http://doi.org/10.1016/S0899-5362(01)80065-8

Price RA (1973) Large-scale gravitational flow of supracrustal rocks, southern Canadian Rockies. In: De Jong KA, Scholten R (eds) Gravity and Tectonics. Wiley, New York, pp 491-502

Price RA, Mountjoy EW (1970) Geologic structure of the Canadian Rocky Mountains between the Bow and Athabasca Rivers - a progress report. In: Wheeler JO (ed) Structure of the Southern Canadian Cordillera. Geological Association of Canada Special Publications 6: 7-25

Prokešová R, Plašienka D, Milovský R (2012) Structural pattern and emplacement mechanisms of the Križna cover nappe (Central Western Carpathians). Geol Carpath 63: 13-32
http://doi.org/10.2478/v10096-012-0001-y

Pryer LL (1993) Microstructures in feldspars from a major crustal thrust zone: the Grenville Front Ontario Canada. J Struct Geol 15: 21-36
http://doi.org/10.1016/0191-8141(93)90076-M

Ramberg H (1980) Diapirism and gravity collapse in the Scandinavian Caledonides. J Geol Soc, London 137: 261-270
http://doi.org/10.1144/gsjgs.137.3.0261

Ramsay JG (1980) Shear zone geometry: a review. J Struct Geol 2: 83-99
http://doi.org/10.1016/0191-8141(80)90038-3

Ramsay JG, Huber MI (1983) The Techniques of Modern Structural Geology, vol. 1. Academic Press, London, pp 1-307

Regenauer-Lieb K, Yuen DA (2003) Modeling shear zones in geological and planetary sciences: solid- and fluid-thermal-mechanical approaches. Earth Sci Rev 63: 295-349
http://doi.org/10.1016/S0012-8252(03)00038-2

Rey P, Vanderhaeghe O, Teyssier C (2001) Gravitational collapse of the continental crust: definition, regimes and modes. Tectonophysics 342: 435-449
http://doi.org/10.1016/S0040-1951(01)00174-3

Samani B (2013) Quartz c-axis evidence for deformation characteristics in the Sanandaj-Sirjan Metamorphic Belt, Iran. J Afr Earth Sci 81: 28-34
http://doi.org/10.1016/j.jafrearsci.2013.01.006

Sarkarinejad K (1999) Tectonic finite strain analysis using Ghouri deformed conglomerate, Neyriz area, southwestern Iran. Ir J Sci Techn 23: 352-363

Sarkarinejad K, Azizi A (2008) Slip partitioning and inclined dextral transpression along the Zagros Thrust System, Iran. J Struct Geol 30: 116-136
http://doi.org/10.1016/j.jsg.2007.10.001

Sarkarinejad K, Ghanbarian MA (2014) The Zagros hinterland fold-and-thrust belt in-sequence thrusting, Iran. J Asian Earth Sci 85: 66-79
http://doi.org/10.1016/j.jseaes.2014.01.017

Sarkarinejad K, Faghih A, Grasemann B (2008) Transpressional deformations within the Sanandaj-Sirjan Metamorphic Belt (Zagros Mountains, Iran). J Struct Geol 30: 818-826
http://doi.org/10.1016/j.jsg.2008.03.003

Sheikholeslami MR, Pique A Mobayen P, Sabzehei M, Bellon H, Hashem Emami M (2008) Tectono-metamorphic evolution of the Neyriz Metamorphic Complex, Quri-Kor-e-Sefid area (Sanandaj-Sirjan Zone, SW Iran). J Asian Earth Sci 31: 504-521
http://doi.org/10.1016/j.jseaes.2007.07.004

Shigematsu N (1999) Dynamic recrystallization in deformed plagioclase during progressive shear deformation. Tectonophysics 305: 437-452
http://doi.org/10.1016/S0040-1951(99)00039-6

Simpson C (1985) Deformation of granitic rocks across the brittle-ductile transition. J Struct Geol 7: 503-511
http://doi.org/10.1016/0191-8141(85)90023-9

Simpson C (1998) Variation in relative recrystallized grain sizes of quartz and feldspar with deformation temperature In: Snoke AW, Tullus J, Todd VR (eds) Fault-Related Rocks: A Photographic Atlas. Princeton University, Press Princeton, pp 256-259

Simpson C, De Paor DG (1993) Strain and kinematic analysis in general shear zones. J Struct Geol 15: 1-20
http://doi.org/10.1016/0191-8141(93)90075-L

Simpson C, Wintsch RP (1989) Evidence for deformation-induced K-feldspar replacement by myrmekite. J Metamorph Geol 7: 261-275
http://doi.org/10.1111/j.1525-1314.1989.tb00588.x

Stipp M, Stünitz H, Heilbronner R, Schmid SM (2002a) The eastern Tonale fault zone: a ‘natural laboratory’ for crystal plastic deformation of quartz over a temperature range from 250 to 700 °C. J Struct Geol 24: 1861-1884
http://doi.org/10.1016/S0191-8141(02)00035-4

Stipp M, Stünitz H, Heilbronner R, Schmid SM (2002b) Dynamic recrystallization of quartz: correlation between natural and experimental conditions. In: De Meer S, Drury MR, De Bresser JHP, Pennock GM (eds) Deformation Mechanisms, Rheology and Tectonics: Current Status and Future Perspectives. Geological Society London Special Publications 200: 171-190
http://doi.org/10.1144/GSL.SP.2001.200.01.11

Stöcklin J (1968) Structural history and tectonics of Iran: a review: AAPG Bull 52: 1229-1258
http://doi.org/10.1306/5D25C4A5-16C1-11D7-8645000102C1865D

Sullivan WA (2008) Significance of transport-parallel strain variations in part of the Raft River shear zone, Raft River Mountains, Utah, USA. J Struct Geol 30: 138-158
http://doi.org/10.1016/j.jsg.2007.11.007

Thigpen RJ, Law RD, Lloyd GE, Brown SJ (2010) Deformation temperatures vorticity of flow and strain in the Moine thrust zone and Moine nappe: reassessing the tectonic evolution of the Scandian foreland-hinterland transition zone. J Struct Geol 32: 920-940
http://doi.org/10.1016/j.jsg.2010.05.001

Tullis J (2002) Deformation of granitic rocks: experimental studies and natural examples. In: Karato S Wenk H (eds) Plastic Deformation of Minerals and Rocks. Mineralogical Society of America and Geochemical Society Reviews in Mineralogy and Geochemistry 51: 51-95
http://doi.org/10.2138/gsrmg.51.1.51

Tullis J, Yund RA (1985) Dynamic recrystallization of feldspar: a mechanism for ductile shear zone formation: Geol 13: 238-241
http://doi.org/10.1130/0091-7613(1985)13<238:DROFAM>2.0.CO;2

Tullis J, Yund RA (1992) The brittle-ductile transition in feldspar aggregates: an experimental study. In: Evans B, Wong TF (eds) Fault Mechanics and Transport Properties in Rocks. Academic Press, New York, pp 89-118
http://doi.org/10.1016/S0074-6142(08)62816-8

Van Bemmelen RW (1960) New views on East-Alpine orogenesis. 21^st International Geological Congress, Copenhagen 18, 99-116

Vauchez A, Tommasi A (2003) Wrench faults down to the asthenosphere: geological and geophysical evidence and thermo-mechanical effects. In: Storti F (eds) Intraplate Strike-slip Deformation Belts. Geological Society London Special Publications 210: 15-34
http://doi.org/10.1144/GSL.SP.2003.210.01.02

Vidal JL, Kubin L, Debat P, Soula JL (1980) Deformation and dynamic recrystallization of K-feldspar augen in orthogneiss from Montagne Noire, Occitania, southern France. Lithos 13: 247-244
http://doi.org/10.1016/0024-4937(80)90070-5

Wallis SR (1992) Vorticity analysis in a metachert from the Sanbagawa Belt, SW Japan. J Struct Geol 14: 271-280
http://doi.org/10.1016/0191-8141(92)90085-B

Wallis SR (1995) Vorticity analysis and recognition of ductile extension in the Sanbagawa Belt, SW Japan. J Struct Geol 17: 1077-1093
http://doi.org/10.1016/0191-8141(95)00005-X

Wallis SR, Platt JP, Knott SD (1993) Recognition of syn-convergence extension in accretionary wedges with examples from the Calabrian arc and the eastern Alps. Amer J Sci 293: 463-495
http://doi.org/10.2475/ajs.293.5.463

White SH, Burrows SE, Carreras J, Shaw ND, Humphreys FJ (1980) On mylonites in ductile shear zones. J Struct Geol 2: 175-188
http://doi.org/10.1016/0191-8141(80)90048-6

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
http://doi.org/10.1016/j.jsg.2005.04.002

Wunderlich HG (1953) Bau und Entwicklung des Harznordrandes bei Bad Harzburg. Geol Rundsch 41: 200-223
http://doi.org/10.1007/BF01803501

Xypolias P (2009) Some new aspects of kinematic vorticity analysis in naturally deformed quartzites. J Struct Geol 31: 3-10
http://doi.org/10.1016/j.jsg.2008.09.009

Xypolias P, Kokkalas S (2006) Heterogeneous ductile deformation along a mid-crustal extruding shear zone: an example from the External Hellenides (Greece) In: Law RD, Searle MP, Godin L (eds) Channel Flow, Ductile Extrusion and Exhumation in Continental Collision Zones. Geological Society London Special Publications 268: 497-516
http://doi.org/10.1144/GSL.SP.2006.268.01.23

Xypolias P, Koukouvelas IK (2001) Kinematic vorticity and strain patterns associated with ductile extrusion in the Chelmos shear zone (External Hellenides, Greece). Tectonophysics 338: 59-77
http://doi.org/10.1016/S0040-1951(01)00125-1

Xypolias P, Chatzaras V, Koukouvelas IK (2007) Strain gradients in zones of ductile thrusting: Insights from the External Hellenides. J Struct Geol 29: 1522-1537
http://doi.org/10.1016/j.jsg.2007.05.006

Xypolias P, Spanos D, Chatzaras V, Kokkalas S, Koukouvelas L (2010) Vorticity of flow in ductile thrust zones: examples from the Attico-Cycladic Massif (Internal Hellenides Greece). In: Law R, Butler R, Holdsworth B, Krabbendam M, Strachan R (eds) Continental Tectonics and Mountain Building. Geological Society London Special Publications 335: 687-714
http://doi.org/10.1144/SP335.28