Abstract
A network of 5 cm wide subplanar zones of garnet-granolite with accessory apatite as the dominant hydrous mineral, is overprinted on basic hornblende-granolites in an area of present and past tectonic uplift. Fracturing and the garnet forming reactions appear to be caused by destabilisation of hornblende, as a hydrous phase, through a critical drop in the P∶T ratio. Whereas the apatites from the hornblende-granolite have normal compositions, apatites from the garnet-granolite zones are among the most chlorine enriched hydroxyfluorapatites known. A later amphibolite facies event has depleted hydrous minerals of fluorine and chlorine, affecting hornblende more strongly than apatite. Based on literature data on F and Cl in coexisting minerals, original hornblende compositions are tentatively restored. It is then possible to derive all the chlorine of the garnet zone apatites from the original rock, with differential loss of H2O and HF over chlorine during the dehydration reaction. Diffusion coefficients would have been larger for H2O and HF than for the large chloride ion, and if the gas phase was in contact with even minor anatectic melts, activity gradients would also have been relatively small for chlorine. Low-Cl scapolite is present in quartz-free pegmatoid veins. Field evidence for a genetic tie between the garnet zones and these veins is inconclusive, but liberation of H2O and HF under granolite facies conditions is likely to have caused limited fusion of the plagioclase. Since many garnet zones do not contain even small pegmatoid veins, melts related to their formation could have collected in veins only after initial diffusion or ‘infiltration’ over a distance, and without leaving segregated mafic residues.
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References
Albee AL (1975) Phase equilibria in three assemblages of kyanitezone pelitic schists, Lincoln Mountain quadrangle, central Vermont. J Petrol 6:246–301
Banks NG (1976) Halogen contents of igneous minerals as indicators of magmatic evolution of rocks associated with the Ray porphyry copper deposit, Arizona, J Res US Geol Surv 4(1):91–4117
Behr HJ, et al (1971) Granulites, results of a discussion. Neues Jahrb Mineral, Monatsh 97–123
Bishop DG, Landis CA, Blattner P Geological map of the Hollyford Valley and the Darran and Humboldt Ranges. New Zealand D.S.I.R. Geol Survey, to be published in Miscellaneous Map Series
Blattner P (1976) Replacement of hornblende by garnet in granulite facies assemblages near Milford Sound, New Zealand. Contrib Mineral Petrol 55:181–190
Blattner P (1978) Geology of the crystalline basement between Milford Sound and the Hollyford Valley, New Zealand. N Z J Geol Geophys 21:33–47
Blattner P (1980a) Chlorine and fluorine in apatites and other minerals of basic charnockites from Kondapalli, India. Neues Jahrb Mineral, Monatsh 283–288
Blattner P (1980b) Chlorine-enriched leucogabbro in Nelson and Fiordland, New Zealand. Contrib Mineral Petrol 72:291–296
Blattner P (1980c) ‘Halogen geothermometry’ and case for postCarboniferous granulite facies in Fiordland, New Zealand. Abstr, 26th Int Geol Congr, Paris
Blattner P, Cooper AF (1974) Carbon and oxygen isotopic composition of carbonatite dikes and metamorphic country rock of the Haast Schist terrain, New Zealand. Contrib Mineral Petrol 44:17–27
Broadbent M, Davey FJ (1980) Fiordland seismic refraction survey 1974–5, with appendix by RI Walcott. Rep No 124, Geophysics Division, New Zealand DSIR (1978)
Cruft FF, Ingamells CO, Muysson J (1965). Chemical analysis and thestoichiometry of apatite. Geochim Cosmochim Acta 29:581–597
Darken LS, Gurry RW (1953) Physical chemistry of metals. McGraw-Hill, New York
Deer WA, Howie RA, Zussman J (1962) Rock forming minerals (5 vols). Longmans, London
Dodge FCW, Ross DC (1971) Coexisting hornblendes and biotites from granitic rocks near the San Andreas Fault, California. J Geol 79:158–172
Evans BW, Shaw DM, Haughton DR (1969) Scapolite stoichiometry. Contrib Mineral Petrol 24:293–305
Foland KA (1974) Alkali diffusion in orthoclase. In: Geochemical transport and kinetics AW Hofmann, BJ Giletti, HS Yoder, RA Yund (eds.) pp 77–98. Carnegie Inst Washington
Goldsmith JR (1976) Scapolites, granulites, and volatiles in the lower crust. Geol Soc Am Bull 87:161–168
Goldsmith JR, Newton RC (1977) Scapolite-plagioclase stability relations at high pressures and temperatures in the system NaAlSi3O8-CaAl2Si2O8-CaCO3-CaSO4. Am Mineral 62:1063–1081
Hollister LS (1975) Granulite facies metamorphism in the Coast Range crystalline belt. Can J Earth Sci 12:1953–1955
Kanisawa S (1979) Content and behaviour of fluorine in granitic rocks, Kitakami Mountains, northeast Japan. Chem Geol 24:57–67
Leelanandam C (1969a) Fluorine and chlorine in the charnockitic hornblendes from Kondapalli, India. Neues Jahrb Mineral, Monatsh 335–384
Leelanandam C (1969b) H2O+, F, and Cl in the charnockitic biotites from Kondapalli, India. Neues Jahrb Mineral, Monatsh 461–468
Ludington S (1978) The biotite — apatite geothermometer revisited. Am Mineral 63:551–553
McConnell D (1973) Apatite Springer, Wien New York
Munoz JL, Eugster HP (1969) Experimental control of fluorine reactions in hydrothermal systems. Am Mineral 54:943–959
Munoz JL, Ludington SD (1974) Fluoride-hydroxyl exchange in biotite. Am J Sci 274:396–413
Nash WP (1972) Apatite-calcite equilibria in carbonatites: Chemistry of apatite from Iron Hill, Colorado. Geochim Cosmochim Acta 36:1313–1319
Newton RC, Goldsmith JR (1976) Stability of the end-member scapolities: 3 NaAlSi3O8·NaCl, 3 CaAl2Si2O8·CaCO3, 3 CaAl2Si2O8·CaSO4. Z Kristallogr 143:333–353
Oliver RL (1969) Some observations on the distribution and nature of granulite facies terrains. Geol Soc Australia, Sp Publ no 2, pp 259–268
Oosthuyzen EJ, Burger AJ (1973) The suitability of apatite as an age indicator by the uranium-lead isotope method. Earth Planet Sci Lett 18:29–36
Orville PM (1975) Stability of scapolite in the system Ab-An-NaCl-CaCO3, at 4 kb and 750° C. Geochim Cosmochim Acta 39:1091–1106
Pineau F, Javoy M, Bottinga Y (1976) 13C/12C ratios of rocks and inclusions in popping rocks of the Mid-Atlantic ridge and their bearing on the problem of isotopic composition of deepseated carbon. Earth Planet Sci Lett 29:413–421
Rice JM, Lang HM (1980) Compositional dependency of (OH-F) exchange equilibria involving calcic amphibole solid solution. (Abstr) Geol Soc Am Meeting, Cordilleran Section
Roegge JS, Logsdon MJ, Young HS, Barr HB, Borcsik M, Holland HD (1974) Halogens in apatites from the Providencia area, Mexico. Econ Geol 69:229–240
Shaw DM (1960) The geochemistry of scapolite, Parts I and II. J Petrol 1:218–285
Smith WD (1971) Earthquakes at shallow and intermediate depths in Fiordland, New Zealand. J Geophys Res 76 (20):4901–4907
Sparks RJ, Coote GE, Blattner P Nuclear microprobe determination of low level fluorine in minerals. (To be published in Am Mineral)
Stormer JC, Carmichael ISE (1971) Fluorine-hydroxyl exchange in apatite and biotite: A potential igneous geothermometer. Contrib Mineral Petrol 31:121–131
Suggate RP (1963) The Alpine Fault. Trans R Soc N Z (Geol) 2(7):105–129
Taborszky FK (1972) Chemismus und Optik der Apatite. Neues Jahrb Mineral, Monatsh 79–91
Touret J (1974) Facies granulite et fluides carboniques. Centenaire de la Société Géologique de Belgique. Géologie des Domaines Cristallins, Liège, pp 267–287
Walters LJ Jr, Luth WC (1969) Unit cell dimensions, optical properties, halogen concentrations, in several natural apatites. Am Mineral 54:156–162
Winkler HGF (1965, 1974, 1976) Petrogenesis of metamorphic rocks, 1st 3rd and 4th edn. Springer, Berlin Heidelberg New York
Woodward DJ (1972) Gravity anomalies in Fiordland, south west New Zealand. NZJ Geol Geophys 15:22–32
Wyllie PJ, Tuttle OF (1964) Experimental investigation of silicate systems containing two volatile components. Part III. The effects of SO3, P2O5, HCl, and LiO2, in addition to H2O, on the melting temperatures of albite and granite. Am J Sci 262:930–939
Yoder HS, Stewart DB, Smith JR (1957) Ternary feldspars. Carnegie Inst Washington Yearb 56:206–214
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Blattner, P., Black, P.M. Apatite and scapolite as petrogenetic indicators in granolites of Milford Sound, New Zealand. Contr. Mineral. and Petrol. 74, 339–348 (1980). https://doi.org/10.1007/BF00518115
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DOI: https://doi.org/10.1007/BF00518115