none 10.1144/SP412.1 Geological Society of London Geological Society of London 1881 70841340 65091 2024072310103100912 10.1144 2024-07-23T21:16:06Z 2014-09-10T00:13:01Z 61 Geological Society, London, Special Publications SP 0305-8719 2041-4927 08 18 2015 01 2015 412 1 Rodolfo Carosi Dipartimento di Scienze della Terra, Università di Torino, v. Valperga Caluso, 35 10125 Torino, Italy Chiara Montomoli Dipartimento di Scienze della Terra, Università di Pisa, v. S. Maria, 53 56126 Pisa, Italy C.N.R.-Istituto di Geoscienze e Georisorse, v. Moruzzi, 1 56124 Pisa, 56100 Pisa, Italy Antonio Langone C.N.R.-Istituto di Geoscienze e Georisorse, UOS Pavia, via Ferrata, 1 27100 Pavia, Italy Alice Turina Dipartimento di Geoscienze, Università di Padova, Via Gradenigo, 6 35131, Padova, Italy Bernardo Cesare Dipartimento di Geoscienze, Università di Padova, Via Gradenigo, 6 35131, Padova, Italy Salvatore Iaccarino Dipartimento di Scienze della Terra, Università di Pisa, v. S. Maria, 53 56126 Pisa, Italy Luca Fascioli Dipartimento di Scienze della Terra, Università di Pavia, Via Ferrata, 1 27100, Pavia, Italy Dario Visonà Dipartimento di Geoscienze, Università di Padova, Via Gradenigo, 6 35131, Padova, Italy Ausonio Ronchi Dipartimento di Scienze della Terra, Università di Pavia, Via Ferrata, 1 27100, Pavia, Italy Santa Man Rai Department of Geology, Tribuhuvan University, Ghantaghar, Kathmandu, Nepal Abstract Anatectic melt inclusions (nanogranites and nanotonalites) have been found in garnet of kyanite-gneiss at the bottom of the Greater Himalayan Sequence (GHS) along the Kali Gandaki valley, central Nepal, c. 1 km structurally above the Main Central Thrust (MCT). In situ U–Th–Pb dating of monazite included in garnets, in the same structural positions as melt inclusions, allowed us to constrain partial melting starting at c. 41–36 Ma. Eocene partial melting occurred during prograde metamorphism in the kyanite stability field (Eo-Himalayan event). Sillimanite-bearing mylonitic foliation wraps around garnets showing a top-to-the-SW sense of shear linked to the MCT ductile activity and to the exhumation of the GHS. These findings highlight the occurrence of an older melting event in the GHS during prograde metamorphism in the kyanite stability field before the more diffuse Miocene melting event. The growth of prograde garnet and kyanite at 41–6 Ma in the MCT zone, affecting the bottom of the GHS, suggests that inverted metamorphism in the MCT zone and folded isograds in the GHS should be carefully proved with the aid of geochronology, because not all Barrovian minerals grew during the same time span and they grew in different tectonic settings. 09 09 2014 01 2015 111 129 10.1144/SP412.1 https://doi.org/10.15223/policy-002 10.1144/SP412.1 https://www.lyellcollection.org/doi/10.1144/SP412.1 https://www.lyellcollection.org/doi/pdf/10.1144/SP412.1 https://pubs.geoscienceworld.org/books/book/1780/chapter/107671647/eocene-partial-melting-recorded-in-peritectic https://pubs.geoscienceworld.org/UrlRedirectHandler.ashx?routename=books&chapterdoi=10.1144/SP412.1&request=chapter Geological Society, London, Special Publications Kinematic Evolution and Structural Styles of Fold-and-Thrust Belts Antolín B. 99 2011 Antolín B., Appel A., Montomoli C., Dunkl I., Ding L., Gloaguen R., El Bay R., Poblet J., Lisle R.Kinematic evolution of the eastern Tethyan Himalaya: constraints from magnetic fabric and structural properties of the Triassic flysch in SE TibetKinematic Evolution and Structural Styles of Fold-and-Thrust Belts201134999121Geological Society, London, Special Publications 10.1130/G33455.1 10.1111/gfl.12038 10.1038/414738a IAM 20th General Meeting. Acta mineralogica-petrographica abstract series Bernhardt H.-J. 869 6 2010 Bernhardt H.-J.MINCALC-V5, a non EXCEL based computer program for general electron-microprobe mineral analyses data processing20106IAM 20th General Meeting. Acta mineralogica-petrographica abstract series869 Recherches geologiques dans l'Himalaya du Nepal, region du Makalu Bordet P. 1961 Bordet P.Recherches geologiques dans l'Himalaya du Nepal, region du Makalu1961ParisCentre National de la Recherche Scientifique Geological Society, London, Special Publications Himalayan Tectonics Brown R. L. 461 1993 Brown R. L., Nazarchuk J. H., Treloar P. J., Searle M. P.Annapurna detachment fault in the Greater Himalaya of central NepalHimalayan Tectonics199374461473Geological Society, London, Special Publications 10.1139/e86-111 Geological Society of America Special Papers The South Tibetan Detachment System, Himalayan Orogen: Extension Contemporaneous With and Parallel to Shortening in a Collisional Mountain Belt Burchfiel B. C. 1 1992 Burchfiel B. C., Chen Z., Hodges K. V., Liu Y., Royden L. H., Deng C., Xu L., Burchfiel B. C., Chen Z., Hodges K. V., Liu Y., Royden L. H., Deng C., Xu J.The South Tibetan Detachment System, Himalayan Orogen: extension contemporaneous with and parallel to shortening in a collisional mountain beltThe South Tibetan Detachment System, Himalayan Orogen: Extension Contemporaneous With and Parallel to Shortening in a Collisional Mountain Belt1992269141Geological Society of America Special Papers 10.1016/S1367-9120(99)00014-0 10.1016/S1631-0713(02)01828-X 10.1016/j.jseaes.2006.05.001 10.1029/2008TC002400 10.1111/ter.12062 10.1029/2000JB900375 10.1016/S1367-9120(01)00039-6 Geological Society of America Special Papers Convergent Margin Terranes and Associated Regions: A Tribute to W.G. Ernst Catlos E. J. 135 2007 Catlos E. J., Dubey C. S., Marston R. A., Harrison T. M., Cloos M., Carlson W. D., Gilbert M., Liou J. G., Sorensen S. S.Geochronologic constraints across the Main Central Thrust shear zone, Bhagirathi River (NW India): implications for Himalayan tectonicsConvergent Margin Terranes and Associated Regions: A Tribute to W.G. Ernst2007419135151Geological Society of America Special Papers 10.1130/G25759A.1 Journal of the Virtual Explorer Cesare B. 2 40 2011 Melt inclusions in migmatites and granulites Cesare B., Acosta-Vigil A., Ferrero S., Bartoli O.Melt inclusions in migmatites and granulitesJournal of the Virtual Explorer2011402 Recherches Geologiques dans l'Himalaya du Nepal: Annapurna-Manaslu-Ganesh Himal Colchen M. 1986 Colchen M., Pêcher A., LeFort P.Recherches Geologiques dans l'Himalaya du Nepal: Annapurna-Manaslu-Ganesh Himal1986ParisEditions du Centre National de la Recherches Scientifique 10.2475/ajs.298.7.553 10.1130/B30376.1 10.1016/j.jseaes.2006.07.014 XXXIX Congresso Brasileiro de Geologia, Sociedade Brasileira de Geologià–Núcleo Cruz M. J. 206 2 1996 Cruz M. J., Cunha J. C., Merlet C., Sabaté P.Dataçao pontual das monazitas da regiao de Itambe, Bahia, através da microssonda eletrônica19962XXXIX Congresso Brasileiro de Geologia, Sociedade Brasileira de Geologià–NúcleoBahià–Segipe206209 10.1130/0016-7606(1998)110<0002:NFBDEU>2.3.CO;2 10.1016/j.chemgeo.2008.04.014 Geological Society, London, Special Publications Growth and Collapse of the Tibetan Plateau Dunkl I. 45 2011 Dunkl I., Antolín B., et al., Gloaguen R., Ratschbacher L.Metamorphic evolution of the Tethyan Himalayan flysch in SE TibetGrowth and Collapse of the Tibetan Plateau20113534569Geological Society, London, Special Publications 10.1111/j.1525-1314.2011.00968.x 10.1093/petrology/egp026 Geological Society, London, Special Publications Geochronology: Linking the Isotopic Record with Petrology and Textures Foster G. 25 2003 Foster G., Parrish R. R., Vance D., Müller W., Villa I. M.Metamorphic monazite and generation of P–T–t pathsGeochronology: Linking the Isotopic Record with Petrology and Textures20032202547Geological Society, London, Special Publications 10.1016/S0012-821X(00)00212-0 American Association of Petroleum Geologists Bulletin Gaetani M. 1427 75 1991 Multicyclic history of the northern India continental margin (Northwestern Himalaya) Gaetani M., Garzanti E.Multicyclic history of the northern India continental margin (Northwestern Himalaya)American Association of Petroleum Geologists Bulletin19917514271446 Geology of the Himalayas Gansser A. 1964 Gansser A.Geology of the Himalayas1964LondonWiley Interscience Geology of the Bhutan Himalaya Gansser A. 1983 Gansser A.Geology of the Bhutan Himalaya1983Birkhäuser VerlagBasel 10.1093/petrology/egg056 10.2113/gssgfbull.181.3.227 10.1016/j.chemgeo.2004.06.028 10.1016/S1367-9120(03)00066-X 10.1029/2000TC001204 Geological Society, London, Special Publications Channel Flow, Ductile Extrusion and Exhumation in Continental Collision Zones Godin L. 1 2006 Godin L., Grujic D., Law R. D., Searle M. P., Law R. D., Searle M. P., Godin L.Channel flow, ductile extrusion and exhumation in continental collision zones: an introductionChannel Flow, Ductile Extrusion and Exhumation in Continental Collision Zones2006268123Geological Society, London, Special Publications 10.1016/j.gr.2006.05.003 10.1016/j.lithos.2010.05.003 10.1093/petrology/egs009 10.1016/j.lithos.2010.09.003 10.1029/94TC01611 Geology Hiess J. 1610 335 2012 238U/235U systematics in terrestrial Uranium-bearing minerals Hiess J., Condon D. J., McLean N., Noble S. R.238U/235U systematics in terrestrial Uranium-bearing mineralsGeology201233516101614 10.1130/0016-7606(2000)112<324:TOTHAS>2.0.CO;2 10.1029/96TC01791 10.2113/gselements.7.4.247 10.1039/B304365G 10.1016/j.lithos.2011.12.004 10.1144/0016-76492008-097 10.1016/S0191-8141(97)00074-6 10.1130/B30085.1 10.1130/0091-7613(2000)28<1127:RNTRIF>2.0.CO;2 10.1016/j.epsl.2004.10.007 10.1111/j.1525-1314.2005.00584.x 10.1016/j.lithos.2011.08.007 10.1130/B30073.1 10.1016/j.lithos.2013.08.012 American Journal of Science Le Fort P. 1 275 1975 Himalayas: the Collided Range. Present Knowledge of the Continental Arc Le Fort P.Himalayas: the Collided Range. Present Knowledge of the Continental ArcAmerican Journal of Science1975275144 Geological Society, London, Special Publications Himalayan Tectonics Lombardo B. 341 1993 Lombardo B., Pertusati P., Borghi A., Treloar P. J., Searle M. P.Geology and tectono-magmatic evolution of the eastern Himalaya along the Chomolungma-Makalu transectHimalayan Tectonics199374341355Geological Society, London, Special Publications Berkeley Geochronology Center, Special Publications Isoplot/Ex version 3.0. A geochronological toolkit for Microsoft Excel Ludwig K. R. 2003 Ludwig K. R.Isoplot/Ex version 3.0. A geochronological toolkit for Microsoft Excel20034Berkeley Geochronology Center, Special Publications 10.1016/j.chemgeo.2007.05.003 10.1046/j.1525-1314.2000.00261.x 10.1016/j.tecto.2013.06.006 Geological Society, London, Special Publications Tectonics of the Himalaya Montomoli C. 2014 Montomoli C., Carosi R., Iaccarino S., Mukherjee S., Carosi R., van der Beek P. A., Mukherjee B. K., Robinson D M.Tectonometamorphic discontinuities in the Greater Himalayan Sequence: a local or a regional feature?Tectonics of the Himalaya2014412Geological Society, London, Special PublicationsFirst published online September 18, 2014, http://doi.org/10.1144/SP412.3 10.1007/s00531-012-0806-z Geological Society, London, Special Publications Tectonics of the Himalaya Mukherjee S. Mukherjee S., Mukherjee S., Carosi R., van der Beek P. A., Mukherjee B. K., Robinson D. M.A review of an out-of-sequence deformation in the HimalayaTectonics of the HimalayaIn prep412Geological Society, London, Special Publications 10.1007/s00531-009-0459-8 10.1007/s00531-009-0447-z 10.1007/s00531-011-0650-6 10.1139/e90-152 10.1016/j.chemgeo.2007.02.014 Microtectonics Passchier C. W. 2005 Passchier C. W., Trouw R. J.Microtectonics2005Berlin, HeidelbergSpringer Verlag 10.1093/petroj/39.4.689 Geological Society, London, Special Publications Himalayan Tectonics Pognante U. 323 1993 Pognante U., Benna P., Treloar P. J., Searle M. P.Metamorphic zonation, migmatization, and leucogranites along the Everest transect (Eastern Nepal and Tibet): record of an exhumation historyHimalayan Tectonics199374323340Geological Society, London, Special Publications 10.1144/jgs.158.2.233 10.1007/s00410-012-0812-y 10.1016/0012-821X(84)90114-6 10.1029/92TC00213 10.1130/GES00549.1 10.1130/RF.L006.1 10.1086/376763 10.1016/j.jseaes.2004.03.004 10.1016/S0009-2541(02)00155-9 10.1007/s00269-001-0232-4 10.1130/0091-7613(2000)28<403:TEOMCD>2.0.CO;2 10.1016/j.chemgeo.2010.10.004 10.2138/rmg.2002.48.7 10.1016/j.chemgeo.2010.02.016 10.1029/2009TC002533 10.1111/j.1365-2117.2006.00307.x 10.2113/gscanmin.41.2.259 10.1016/j.epsl.2011.12.005 10.1016/S1367-9120(99)00047-4 10.1016/S1342-937X(05)71168-0 Upreti B. N. Yoshida M.Guidebook for Himalayan Trekkers; Geology and Natural Hazards along the Kaligandaki Valley Nepal2005NepalDepartment of Geology Tri-Chandra Campus Tribhuvan University Kathmandu Mineralogical Association of Canada Short Course Series Laser ablation ICPMS in the Earth sciences: Principles and Applications van Achterbergh E. 239 2001 van Achterbergh E., Ryan C. G., Jackson S. E., Griffin W., Sylvester P.Data reduction software for LA-ICPMSLaser ablation ICPMS in the Earth sciences: Principles and Applications200129239243Mineralogical Association of Canada Short Course Series 10.1130/0091-7613(1999)027<0395:TOPMIT>2.3.CO;2 10.1046/j.1525-1314.1996.00426.x Geological Society of America, Memoirs Origin and Evolution of Precambrian High-Grade Gneiss Terranes, with Special Emphasis on the Limpopo Complex of Southern Africa Vernon R. H. 1 2011 Vernon R. H., van Reenen D. D., Kramers J. D., McCourt S., Perchuk L. L.Microstructures of melt-bearing regional metamorphic rocksOrigin and Evolution of Precambrian High-Grade Gneiss Terranes, with Special Emphasis on the Limpopo Complex of Southern Africa2011207111Geological Society of America, Memoirs 10.1016/S0024-4937(02)00112-3 10.1016/j.lithos.2012.04.012 Earth Sciences Reviews White N. M. 29 195 2002 Constraints on the exhumation and erosion of the High Himalayan Slab, NW India, from foreland basin deposits White N. M., Pringle M., Garzanti E., Bickle M., Najman Y., Chapman H., Friend P.Constraints on the exhumation and erosion of the High Himalayan Slab, NW India, from foreland basin depositsEarth Sciences Reviews20021952944 10.2138/am.2010.3371 10.1016/S0191-8141(01)00088-8 10.1111/j.1525-1314.2012.00995.x 10.1016/j.earscirev.2005.05.004 10.1016/j.gr.2011.07.023