Bimodal stable isotope signatures of Zildat Ophiolitic Mélange, Indus Suture Zone, Himalaya: implications for emplacement of an ophiolitic mélange in a convergent setup

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• 作者：Koushick Sen ; Souvik Das ; Barun K. Mukherjee…
• 关键词：Carbonate ; Mélange ; Fluid inclusion ; Stable isotope ; Himalaya
• 刊名：International Journal of Earth Sciences
• 出版年：2013
• 出版时间：October 2013
• 年：2013
• 卷：102
• 期：7
• 页码：2033-2042
• 全文大小：1240KB
• 参考文献：1. Baumgartner LP, Valley JW (2001) Stable isotope transport and contact metamorphic fluid flow. In: Valley JW, Cole D (ed) Stable isotope geochemistry, Min Soc Am. Rev Mineral Geochem 43:415-67
  2. Bebout GE, Barton MD (1989) Fluid flow and metasomatism in a subduction-zone hydrothermal system: catalina Schist terrane, California. Geology 17:976-80 CrossRef
  3. Bebout GE, Barton MD (1993) Metasomatism during subduction: products and possible paths in the Catalina Schist, California. Chem Geol 108:61-2 CrossRef
  4. Bebout GE, Barton MD (2002) Tectonic and metasomatic mixing in a high-T, subduction-zone mélange—insights into the geochemical evolution of the slab–mantle interface. Chem Geol 187:79-06 CrossRef
  5. Berthelsen A (1953) On the geology of the Rupshu district, NW Himalaya. Medd Dan Geol Foren 12:350-14
  6. Bestmann M, Kunze K, Matthews A (2000) Evolution of a calcite marble shear zone complex on Thassos Island, Greece; microstructural and textural fabrics and their kinematic significance. J Struct Geol 22(11-2):1789-807 CrossRef
  7. Bowman JR, Willett SD, Cook SJ (1994) Oxygen isotope transport and exchange during fluid flow: one-dimensional models and applications. Am J Sci 294:1-5 CrossRef
  8. Bowman JR, Valley JW, Kita NT (2009) Mechanisms of oxygen isotopic exchange and isotopic evolution of 18O/16O-depleted periclase zone marbles in the Alta aureole, Utah: insights from ion microprobe analysis of calcite. Contrib Mine Petrol 157:77-3 CrossRef
  9. Brady JB, Markley MJ, Schumacher JC, Cheney JT, Bianiardi GA (2004) Aragonite pseudomorphs in high-pressure marbles of Syros, Greece. J Struct Geol 26:3- CrossRef
  10. Burg JP, Chen GM (1984) Tectonics and structural zonation of southern Tibet, China. Nature 311:219-23 CrossRef
  11. Burkhard M (1993) Calcite twins, their geometry, appearance and significance as stress–strain markers and indicators of tectonic regime: a review. J Struct Geol 15:351-68 CrossRef
  12. Carlson WD (1983) The polymorphs of CaCO3 and the aragonite–calcite transformation. In: Reeder RJ (ed) Carbonates: Mineralogy and Chemistry. Min Soc Am, Rev Mineral 11:191-25
  13. Cartwright I, Vry J, Sandiford M (1995) Changes in stable isotope ratios of metapelites and marbles during regional metamorphism, Mount Lofty Ranges, South Australia : implications for crustal scale fluid flow. Contrib Miner Petrol 120:292-10 CrossRef
  14. Cloos M (1982) Flow melanges: numerical modelling and geologic constraints on their origin in the Franciscan subduction complex. Geol Soc Am Bull 93:330-45 CrossRef
  15. Colchen M, Mascle G, Delaygue G (1994) Lithostratigraphy and age of the formations in the Tso Morari dome (abstract). J Nepal Geol Soc 10:23
  16. Corfield R, Searle M, Owen G (1999) The Photang thrust sheet: a subduction—accretion complex beneath the Spontang ophiolite, Ladakh Himalaya. J Geol Soc 156:1031-044 CrossRef
  17. Covey-Crump SJ, Rutter EH (1989) Thermally-induced grain growth of calcite marbles on Naxos Island Greece. Contrib Miner Petrol 101(1):69-6 CrossRef
  18. de Sigoyer J, Guillot S, Lardeaux JM, Mascle G (1997) Glaucophane-bearing eclogites in the Tso Morari dome (eastern Ladakh, NW Himalaya). Eur J Miner 9:1073-083
  19. de Sigoyer J, Gulliot S, Dick P (2004) Exhumation of ultrahigh-pressure Tso Morari unit in eastern Ladakh (NW Himalaya): a case study. Tectonics 23:TC3003. doi:10.1029/2002TC001492
  20. Federico L, Crispini L, Scambelluri M, Capponi G (2007) Ophiolite mélange zone records exhumation in a fossil subduction channel. Geology 35:499-02 CrossRef
  21. Ferrill D (2004) Calcite twin morphology: a low-temperature deformation geothermometer. J Struct Geol 26(8):1521-529 CrossRef
  22. Gansser A (1964) The Geology of the Himalayas. Wiley Interscience, New York, p 289
  23. Gansser A (1974) The Ophiolitic Melange, a world-wide problem on Tethyan examples. Eclog Geol Helv 67(3):479-07
  24. Gao J, Klemd R (2001) Primary fluids entrapped at blueschist to eclogite transition: evidence from the Tianshan meta-subduction complex in northwest China. Contrib Miner Petrol 142:1-4 CrossRef
  25. Gorman PJ, Kerrick DM, Connolly JAD (2006) Modeling open system metamorphic decarbonation of subducting slabs. Geochem Geophys Geosyst. doi:10.1029/2005GC001125
  26. Guillot S, de Sigoyer J, Lardeaux JM, Mascle G (1997) Eclogitic metasediments from the Tso Morari area (Ladakh, Himalaya): evidence for continental subduction during India-Asia convergence. Contrib Miner Petrol 128:197-12 CrossRef
  27. Guillot S, Hattori K, de Sigoyer J (2000) Mantle wedge serpentinization and exhumation of eclogites: insights from eastern Ladakh, northwest Himalaya. Geology 28:199-02 CrossRef
  28. Halama R, John T, Herms P, Hauff F, Schenk V (2011) A stable (Li, O) and radiogenic (Sr, Nd) isotope perspective on metasomatic processes in a subducting slab. Chem Geol 281:151-66 CrossRef
  29. Hall R (1976) Ophiolite emplacement and the evolution of the Taurus suture zone, southeastern Turkey. Geol Soc Am Bull 87:1078-088 CrossRef
  30. Hall R (1980) Unmixing a Mélange: the petrology and history of a disrupted and metamorphosed ophiolite, southeastern Turkey. J Geol Soc 137:195-06 CrossRef
  31. Hoefs J (1980) Stable isotope geochemistry. Springer
  32. Hsü KJ (1968) Principles of melanges and their bearing on the Franciscan-Knoxville paradox. Geol Soc Am Bull 79:1063-074 CrossRef
  33. Kerrick DM, Connolly JAD (2001) Metamorphic devolatilization of subducted marine sediments and the transport of volatiles into the Earth’s mantle. Nature 411:293-96 CrossRef
  34. Kessel R, Schmidt M, Ulmer P, Pettke T (2005) Trace element signature of subduction-zone fluids, melts and supercritical liquids at 120-80?km depth. Nature 437:724-27 CrossRef
  35. King RL, Kohn MJ, Eiler JM (2003) Constraints on the petrologic structure of the subduction zone slab–mantle interface from Franciscan Complex exotic ultramafic blocks. Geol Soc Am Bull 115:1097-109 CrossRef
  36. Mahéo G, Fayoux X, Guillot S, Garzanti E, Capiez P, Mascle G (2006) Relicts of an intra-oceanic arc in the Sapi-Shergol mélange zone (Ladakh, NW Himalaya, India): implications for the closure of the Neo-Tethys Ocean. J Asian Earth Sci 26:695-07 CrossRef
  37. Manning CE (1997) Coupled reaction and flow in subduction zones: Silica metasomatism in the mantle wedge. In: Jamtveit B, Yardley BWD (eds) Fluid flow and transport in rocks. Chapman and Hall, London, pp 139-48 CrossRef
  38. Mukherjee S, Mulchrone K (2012) Estimating the viscosity of the Tso Morari crystallines gneiss dome, Indian Western Himalaya. Int J Earth Sci 101:1929-947 CrossRef
  39. Mukherjee BK, Sachan HK (2001) Discovery of coesite from Indian Himalaya: a record of ultra-high pressure metamorphism in Indian continental crust. Curr Sci 81:1358-361
  40. Mukherjee BK, Sachan HK (2009) Fluids in coesite-bearing rocks of the Tso Morari Complex, NW Himalaya: evidence for entrapment during peak metamorphism and subsequent uplift. Geol Mag 156(6):876-89 CrossRef
  41. Nicolas A, Girardeau J, Marcoux J, Dupre B, Xibin W, Yougong C, Zheng H, Xuchang X (1981) The Xigaze ophiolite (Tibet): a peculiar oceanic lithosphere. Nature 294:414-17 CrossRef
  42. Norman T (1975) Flow features of Ankara mélange. 9th Int Cong Sediment 4:261-69
  43. Onen AP (2003) Neotehyan ophiolitic rocks of the Anatolides of NW Turkey and comparison with Tauride ophiolites. J Geol Soc 160:947-62 CrossRef
  44. Pálfy J, Demény A, Haas J, Hetényi M, Orchard MJ, Veto I (2001) Carbon isotope anomaly and other geochemical changes at the Triassic-Jurassic boundary from a marine section in Hungary. Geology 29:1047-050 CrossRef
  45. Passchier CW, Trouw RAJ (2005) Microtectonics. Springer
  46. Plank T (2005) Constraints from thorium/lanthanum on sediment recycling at subduction zones and the evolution of the continents. J Petrol 46:921-44 CrossRef
  47. Raymond LA (1984) Classification of mélanges. Spec Pap Geol Soc Am 198:7-0 CrossRef
  48. Raymond LA, Terranova T (1984) Prologue: the melange problem—a review. In: Raymond LA (ed) Mélanges: their nature, origin, and significance. Spec Pap Geol Soc Am 198:1-
  49. Scambelluri M, Philippot P (2001) Deep fluids in subduction zones. Lithos 55:213-27 CrossRef
  50. Scambelluri M, Piccardo GB, Philippot P, Robbiano A, Negretti L (1997) High salinity fluid inclusions formed from recycled seawater in deeply subducted alpine serpentinite. Earth Planet Sci Lett 148:485-00 CrossRef
  51. Schmid SM, Paterson MS, Boland JN (1980) High temperature flow and dynamic recrystallization in Carrara Marble. Tectonophysics 65:245-80 CrossRef
  52. Schmidt MW, Poli S (2003) Generation of mobile components during subduction of oceanic crust. In: Rudnick RL, Holland HD, Turekian KK (eds) Treatise Geochem 3:567-90
  53. Steck A, Epard JL, Vannay JC, Hunziker J, Girard M, Morard A, Robyr M (1998) Geological transect across the Tso Morari and Spiti areas: the nappe structures of the Tethys Himalaya. Eclog Geol Helv 91:103-21
  54. Tankut A, Dilek Y, ?nen P (1998) Petrology and geochemistry of the Neo-Tethyan volcanism as revealed in the Ankara mélange, Turkey. J Volcanol Geoth Res 85:265-84 CrossRef
  55. Thakur VC, Misra DK (1984) Tectonic framework of the Indus and Shyok suture. Tectonophysics 101:207-20 CrossRef
  56. Thakur VC, Virdi NS (1979) Lithostratigraphy, structural framework, deformation and metamorphism of the southeastern region of Ladakh, Kashmir Himalaya, India. Him Geol 9:63-8
  57. Veizer J, Ala D, Azmy K et al (1999) ⁸⁷Sr/⁸⁶Sr, δ13C and δ18O evolution of Phanerozoic seawater. Chem Geol 161:59-8 CrossRef
  58. Virdi NS, Thakur VC, Kumar S (1977) Blueschist facies metamorphism from the Indus suture zone of Ladakh and its significance. Him Geol 7:479-82
  59. Wakabayashi J (1999) Subduction and the rock record: concepts developed in the Franciscan Complex, California. Spec Pap Geol Soc Am 338:123-33
  60. Wallmann K (2001) The geological water cycle and the evolution of marine δ18O values. Geochim Cosmochim Acta 65:2469-485 CrossRef
  61. Wang XB, Bao PS, Xiao XC (1987) Ophiolites of the Yarlung Zangbo (Tsangbo) River, Xizang (Tibet). Publishing House of Surveying and Mapping, Beijing
  62. Wickham SM, Taylor HP (1987) Stable isotope constraints on the origin and depth of penetration of hydrothermal fluids associated with Hercynian regional metamorphism and crustal anatexis in the Pyrenees. Contrib Mineral Petrol 95:255-68 CrossRef
  63. Zack T, John T (2007) An evaluation of reactive fluid flow an trace element mobility in subducting slabs. Chem Geol 239:199-16 CrossRef
  
• 作者单位：Koushick Sen (1)
  Souvik Das (1)
  Barun K. Mukherjee (1)
  Koushik Sen (1)
  
  1. Wadia Institute of Himalayan Geology, 33 GMS Road, Dehra Dun, 248 001, India
  
• ISSN：1437-3262

文摘

Zildat Ophiolitic Mélange (ZOM) of the Indus Suture Zone, Himalaya, represents tectonic blocks of the fragmented oceanic metasediments and ophiolite remnants. The ZOM is sandwiched between the Zildat fault adjacent to a gneissic dome known as Tso Morari Crystalline (TMC) and thin sliver of an ophiolite called as the Nidar Ophiolitic Complex. The ZOM contain chaotic low-density lithologies of metamorphosed oceanic sediments and hydrated mantle rocks, in which carbonates are present as mega-clasts ranging from 100 meters to few centimeters in size. In this work, calcite microstructures, fluid inclusion petrography and stable isotope analyses of carbonates were carried out to envisage the emplacement history of the ZOM. Calcite microstructure varies with decreasing temperature and increasing intensity of deformation. Intense shearing is seen at the marginal part of the mélange near Zildat fault. These observations are consistent with the mélange as a tectonically dismembered block, formed at a plate boundary in convergent setup. The δ18O and δ13C isotope values of carbonates show bimodal nature from deeper (interior) to the shallower (marginal, near the Zildat fault) part of the mélange. Carbonate blocks from deeper part of the mélange reflect marine isotopic signature with limited fluid–rock interaction, which later on provide a mixing zone of oceanic metasediments and/or hydrated ultramafic rocks. Carbonates at shallower depths of the mélange show dominance of syn-deformation hydrous fluids, and this has later been modified by metamorphism of the adjacent TMC gneisses. Above observations reveal that the mélange was emplaced over the subducting Indian plate and later on synchronously deformed with the TMC gneissic dome.