Contributions to Mineralogy and Petrology

, Volume 82, Issue 4, pp 334–350 | Cite as

Progressive metamorphism of the Unazuki pelitic schists in the Hida terrane, central Japan

  • Y. Hiroi


Four progressive mineral zones I (chloritoid+quartz), II (staurolite+chlorite+muscovite), III (kyanite+biotite) and IV (sillimanite + muscovite) have been mapped in a well-defined stratigraphic unit of ferruginous pelitic composition from north to south over a distance of about 15 km in the Unazuki area, Hida terrane, central Japan. Textural and chemical evidence indicates that a given metamorphic mineral assemblage was formed from the mineral assemblage that precedes it in a spatial sequence of mineral zones.

An unusually large number of chloritoid-bearing mineral parageneses have been found within a small area in zone I, suggesting that they were equilibrated close to the seven-phase invariant point consisting of staurolite, chloritoid, garnet, chlorite, biotite, muscovite, and quartz in the five-component system Al2O3-FeO-MgO-K2O-SiO2 at a fixed \(P_{{\text{H}}_{\text{2}} {\text{O}}}\). Chloritoid also has been found as inclusions in garnet from zones II and III, but is never in direct contact with quartz in these zones.

All garnets in the chloritoid-bearing rocks from zones I, II, and III are characteristically poor in Mn and Ca at the cores, suggesting, in conjunction with textural and modal evidence, that they were formed as the products of chloritoid-consuming reactions. Compositional and textural features of the garnets in the chloritoid-bearing rocks suggest that rocks in zones II and III bypassed the seven-phase invariant point on the high pressure side during prograde metamorphism. Thus the metamorphic geotherm based on the progressive mineral zones is not always identical with the P-T paths followed by rocks.


Chlorite Textural Feature Mineral Assemblage Kyanite Sillimanite 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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  1. Albee AL (1965) A petrogenetic grid for the Fe-Mg silicates of pelitic schists. Am J Sci 263:512–536Google Scholar
  2. Albee AL (1972) Metamorphism of pelitic schists: Reaction relations of chloritoid and staurolite. Bull Geol Soc Am 83:3249–3268Google Scholar
  3. Ashworth JR (1975) Staurolite at anomalously high grade. Contrib Mineral Petrol 53:281–291Google Scholar
  4. Baltatzis E (1979a Staurolite-forming reactions in the eastern Dalradian rocks of Scotland. Contrib Mineral Petrol 69:193–200Google Scholar
  5. Baltatzis E (1979b) Zoning in garnets from metapelitic schists, eastern Dalradian, Scotland. N Jb Miner Mh 321–328Google Scholar
  6. Béthune P de, Laduron D, Bocquet J (1975) Diffusion processes in resorbed garnets. Contrib Mineral Petrol 50:197–204Google Scholar
  7. Carmichael DM (1970) Intersecting isograds in the Whetstone Lake area, Ontario. J Petrol 11:147–181Google Scholar
  8. Chinner GA (1960) Pelitic gneisses with varying ferrous/ferric ratios from Glen Clova, Angus, Scotland. J Petrol 1:178–217Google Scholar
  9. Chinner GA (1967) Chloritoid, and the isochemical character of Barrow's zones. J Petrol 8:268–282Google Scholar
  10. England PC, Richardson SW (1977) The influence of erosion upon the mineral facies of rocks from different metamorphic environment. J Geol Soc London 134:201–213Google Scholar
  11. Ferry JM, Spear FS (1978) Experimental calibration of the partitioning of Fe and Mg between biotite and garnet. Contrib Mineral Petrol 66:113–117Google Scholar
  12. Fox JS (1971) Coexisting chloritoid and staurolite and the staurolite-chlorite isograd from the Agnew Lake area, Ontario, Canada. Geol Maga 108:205–219Google Scholar
  13. Ganguly J (1968) Analysis of the stabilities of chloritoid and staurolite and some equilibria in the system FeO-Al2O3-SiO2-H2O-O2. Am J Sci 266:277–298Google Scholar
  14. Ganguly J (1969) Chloritoid stability and related parageneses; theory, experiments, and applications. Am J Sci 267:910–944Google Scholar
  15. Ganguly J (1972) Staurolite stability and related parageneses; theory, experiments, and applications. J Petrol 13:335–365Google Scholar
  16. Ghent ED (1976) Plagioclase-garnet-Al2SiO5-quartz: A potential geobarometer-geothermometer. Am Mineral 61:710–714Google Scholar
  17. Goldman DS, Albee AL (1977) Correlation of Mg/Fe partitioning between garnet-biotite with 18O/16O partitioning between quartz and magnetite. Am J Sci 277:750–767Google Scholar
  18. Grant JA, Weiblen PW (1971) Retrograde zoning in garnet near the second sillimanite isograd. Am J Sci 270:281–296Google Scholar
  19. Greenwood HJ (1976) Metamorphism at moderate temperatures and pressures. In: Bailey DK, Macdonald R (eds) The evolution of the crystalline rocks. Academic Press, London, pp. 187–259Google Scholar
  20. Grieve RAF, Fawcett JJ (1974) The stability of chloritoid below 10 kb \(P_{{\text{H}}_{\text{2}} {\text{O}}}\). J Petrol 15:113–139Google Scholar
  21. Hara I (1982) Evolutional processes of paired metamorphic belts — Hida belt and Sangun belt —. Mem Geol Soc Japan 21:71–89Google Scholar
  22. Harte B (1975) Determination of a pelitic petrogenetic grid for the eastern Scottish Dalradian. Carnegie Inst Wash Yearb 74:438–446Google Scholar
  23. Hiroi Y (1978) Geology of the Unazuki district in the Hida metamorphic terrane, central Japan. J Geol Soc Japan 84:521–530Google Scholar
  24. Hiroi Y (1980) Petrography of the Unazuki pelitic schists, Hida terrane, central Japan. Bull Fac Edu Kanazawa Univ Nat Sci 28:69–87Google Scholar
  25. Hiroi Y (1981) Subdivision of the Hida metamorphic complex, central Japan, and its bearing on the geology of the Far East in pre-Sea of Japan time. Tectonophys 76:317–333Google Scholar
  26. Holdaway MJ (1971) Stability of andalusite and the aluminium silicate phase diagram. Am J Sci 271:97–131Google Scholar
  27. Hoschek G (1967) Untersuchungen zum Stabilitätsbereich von Chloritoid und Staurolith. Contrib Mineral Petrol 14:123–162Google Scholar
  28. Hoschek G (1969) The stability of staurolite and chloritoid and their significance in metamorphism of pelitic rocks. Contrib Mineral Petrol 22:208–232Google Scholar
  29. Hounslow AW, Moore JM (1967) Chemical petrology of Glenville schists near Fernleigh, Ontario. J Petrol 8:1–28Google Scholar
  30. Hutcheon I (1979) Sulfide-oxide-silicate equilibria; Snow Lake, Manitoba. Am J Sci 279:643–665Google Scholar
  31. Itaya T, Banno S (1980) Paragenesis of titanium-bearing accessories in pelitic schists of the Sanbagawa metamorphic belt, central Shikoku, Japan. Contrib Mineral Petrol 73:267–276Google Scholar
  32. Kitamura M, Hiroi Y (1982) Indialite from Unazuki schist, Japan, and its transition texture to cordierite. Contrib Mineral Petrol 80:110–116Google Scholar
  33. Kretz R (1964) Analysis of equilibrium in garnet-biotite-sillimanite gneisses from Quebec. J Petrol 5:1–20Google Scholar
  34. Labotka TC (1981) Petrology of an andalusite-type regional metamorphic terrane, Panamint Mountains, California. J Petrol 22:261–296Google Scholar
  35. Miyashiro A (1961) Evolution of metamorphic belts. J Petrol 2:277–311Google Scholar
  36. Miyashiro A, Haramura H (1962) Chemical compositions of Paleozoic slates. IV. Zonal distribution of geosynclinal sediments and the position of regional metamorphic belts. J Geol Soc Japan 68:75–82Google Scholar
  37. Miyashiro A, Shido F (1973) Progressive compositional change of garnet in metapelite. Lithos 6:13–20Google Scholar
  38. Nagger MH, Atherton MP (1970) The compositional and metamorphic history of some aluminium silicate-bearing rocks from the aureoles of the Donegal granites. J Petrol 11:549–589Google Scholar
  39. Newton RC, Haselton HT Jr (1981) Thermodynamics of the garnet-plagioclase-Al2SiO5-quartz geobarometer. In: Newton RC, Navrotsky A, Wood BJ (eds) Thermodynamics of minerals and melts. Springer, New York, pp. 131–147Google Scholar
  40. Ohmoto H, Kerrick D (1977) Devolatilization equilibria in graphitic systems. Am J Sci 277:1013–1044Google Scholar
  41. Rao BB, Johannes W (1979) Further data on the stability of staurolite+quartz and related assemblages. N Jb Miner Mh 437–447Google Scholar
  42. Richardson SW (1968) Staurolite stability in a part of the system Fe-Al-Si-O-H. J Petrol 9:467–488Google Scholar
  43. Richardson SW, Gilbert MC, Bell PM (1969) Experimental determination of kyanite-andalusite and andalusite-sillimanite equilibria; the aluminum silicate triple point. Am J Sci 267:259–272Google Scholar
  44. Rumble D III (1974) Gradients in the chemical potentials of volatile components between sedimentary beds of the Clough Formation, Black Mountain, New Hampshire. Carnegie Inst Wash Yearb 73:371–380Google Scholar
  45. Rumble D III (1978) Mineralogy, petrology, and oxygen isotopic geochemistry of the Clough Formation, Black Mountain, Western New Hampshire, USA. J Petrol 19:317–340Google Scholar
  46. Shaw DM (1956) Geochemistry of pelitic rocks. III. Major elements and general geochemistry. Bull Geol Soc Am 67:919–934Google Scholar
  47. Shibata K, Nozawa T, Wanless RK (1970) Rb-Sr geochronology of the Hida metamorphic belt, Japan. Canad J Earth Sci 7:1383–1401Google Scholar
  48. Suwa K (1979) Biotite schist and leptite from the Kitamata-dani and Kasa-dani of the upper Katakai-gawa area, Toyama Prefecture. In: the basement of the Japanese Islands-Professor H Kano Mem vol, Toko Prin Co, Sendai, pp 15–27Google Scholar
  49. Thompson AB (1976a) Mineral reactions in pelitic rocks; I. Prediction of P-T-X(Fe-Mg) phase relations. Am J Sci 276:401–424Google Scholar
  50. Thompson AB (1976b) Mineral reactions in pelitic rocks; II. Calculation of some P-T-X(Fe-Mg) phase relations. Am J Sci 276:425–454Google Scholar
  51. Thompson AB, Tracy RJ, Lyttle PT, Thompson JB Jr (1977) Prograde reaction histories deduced from compositional zonation and mineral inclusions in garnet from the Gassetts schist, Vermont. Am J Sc 277:1152–1167Google Scholar
  52. Thompson JB (1957) The graphical analysis of mineral assemblages in pelitic schists. Am Mineral 42:842–858Google Scholar
  53. Tracy RJ, Robinson P, Thompson AB (1976) Garnet composition and zoning in the determination of temperature and pressure of metamorphism, central Massachusetts. Am Mineral 61:762–775Google Scholar
  54. Tuttle OF, Bowen NL (1958) Origin of granite in light of experimental studies in the system NaAlSi3O8-KAlSi3O8-SiO2-H2O. Geo Soc Am Mem 74:1–153Google Scholar
  55. Wada H (1982) Metamorphic temperature determined by carbon isotopic geothermometry for the Hida metamorphic belt, central Japan. J Geol Soc Japan 88:741–751Google Scholar
  56. Yamaguchi M, Yanagi T (1970) Geochronology of some metamorphic rocks in Japan. Eclogae Geol Helv 63:371–388Google Scholar
  57. Yardley BWD (1977) An empirical study of diffusion in garnet. Am Mineral 62:793–800Google Scholar
  58. Yardley BWD, Leake BE, Farrow CM (1980) The metamorphism of Fe-rich pelites from Connemara, Ireland. J Petrol 21:365–399Google Scholar
  59. Zen E-an (1981) Metamorphic mineral assemblages of slightly calcic pelitic rocks in and around the tectonic allocthon, southwestern Massachusetts and adjacent Connecticut and New York. US Geol Surv Prof Paper 1113:1–128Google Scholar

Copyright information

© Springer-Verlag 1983

Authors and Affiliations

  • Y. Hiroi
    • 1
  1. 1.Institute of Earth Science, Faculty of EducationKanazawa UniversityKanazawaJapan

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