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Mineralogic reaction zones at a calc-silicate/metapelite interface: an example of trace element mobility in a metamorphic environment

Published online by Cambridge University Press:  05 July 2018

J. V. Owen ,
J. Dostal  and
B. N. Church
J. V. Owen
Affiliation:
Department of Geology, Saint Mary's University, Halifax, N.S., Canada B3H 3C3
J. Dostal
Affiliation:
Department of Geology, Saint Mary's University, Halifax, N.S., Canada B3H 3C3
B. N. Church
Affiliation:
Department of Energy, Mines and Petroleum Resources, Victoria, B.C., Canada V8V 1X4
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Abstract

Metasomatic interaction on a cm scale between calc-silicate pods and the enclosing sillimanite + biotite + tourmaline gneiss at Partridge Breast Lake, northern Manitoba, Canada, led to the development of an inner (by calc-silicate rock), hornblende-rich reaction zone and an outer, biotite-rich zone. The boundary between the reaction zones is interpreted as the original calc-silicate/metapelite interface. Compared with its metapelitic protolith, the biotite zone shows a two- to twenty-fold depletion in the concentrations of incompatible trace elements (notably the light rare earths, U, Th, Nb, Ta, Zr and Hf). In contrast, the relative concentrations of trace elements remained nearly constant during the mineralogical transformation of the calc-silicate rock to the hornblende zone. The depletion of trace elements in the biotite zone is attributed to the dissolution of accessory phases (e.g. monazite). Although stable at the metamorphic conditions (∼600–650°C at ∼ 4.5 kbar) prevalent during metasomatism, Mg-rich tourmaline is absent in the biotite zone, suggesting that either the pH or composition (e.g. the (Al + Si)/(Ca + Mg + Fe) ratio) of the aqueous fluid phase was inappropriate for the preservation of this mineral.

Keywords

metasomatismreaction zonecalc-silicatemetapelitetrace elementManitoba
Type
Geochemistry
Information
Mineralogical Magazine , Volume 58 , Issue 391 , June 1994 , pp. 205 - 214
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1994

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References

Berman, R. G. (1988) Internally-consistent thermo-dynamic data for stoichiometric minerals in the system Na2O-K2O-CaO-FeO-Fe2O3-Al2O3-SiO2-TiO2-H2O-CO2. J. Petrol. 29, 445–522.Google Scholar
Berman, R. G. (1990) Mixing properties of Ca-Mg-Fe-Mn garnets. Amer. Mineral. 75, 328—44.Google Scholar
Berman, R. G. (1991) Thermobarometry using multi-equilibrium calculations: a new technique, with petrological applications. Can. Mineral., 29, 833–55.Google Scholar
Berman, R. G. and Koziol, A. M. (1991) Ternary excess properties of grossular-pyrope-almandine garnets and their influence in geothermobarome-try. Amer. Mineral, 76, 1223–31.Google Scholar
Deer, W. A., Howie, R. A. and Zussman, I. (1986) Rock-forming Minerals. Vol. IB. Disilicates and Ring Silicates. Longman Scientific & Technical, Harlow, U.K. 2nd ed. 629 pp.Google Scholar
Dipple, G. M., Wintsch, R. P. and Andrews, M. S. (1990) Identification of the scales of differential element mobility in a ductile fault zone. J. Metamorph. Geol., 8, 645–61.Google Scholar
Fuhrman, M. L. and Lindsley, D. H. (1988) Ternary-feldspar modelling and thermometry. Amer. Mineral. 73., 201-15.Google Scholar
Grant, J. A. (1986) The isocon diagram — a simple solution to Gresens’ equation for metasomatic alteration. Econ. Geol, 81, 1976–82.Google Scholar
Grauch, R. I. (1989) Rare earth elements in metamorphic rocks. In Geochemistry and Mineralogy of Rare Earth Elements. (Lipin, B. R. and McKay, G. A., eds.), Mineralogical Society of America, Reviews in Mineralogy, v. 21,147—67.Google Scholar
Gresens, R. L. (1967) Composition—volume relationships of metasomatism. Chem. Geol., 2, 47—65.Google Scholar
Jackson, S. E., Longerich, H. P., Dunning, G. R. and Fryer, B. J. (1992) The application of laser-ablation microprobe-inductively coupled plasma-mass spectrometry (LAM-ICP-MS) to in situ trace-element determinations in minerals. Can. Mineral., 30, 1049–6.Google Scholar
Jolliff, B. L., Papike, J. J. and Laul, J. C. (1987) Mineral recorders of pegmatite internal evolution: REE contents of tourmaline from the Bob Ingersoll pegmatite, South Dakota. Geochim. Cosmochim. Ada, 51, 2225–32.Google Scholar
Kretz, R. (1959) Geology of Northern Indian Lake area, Manitoba. Geol. Surv. Can., Map 2-1959.Google Scholar
Kretz, R. (1967) Granite and pegmatite studies at Northern Indian Lake, Manitoba. Geol. Surv. Can. Bull., 148, 42 pp.Google Scholar
Longerich, H. P., Jenner, G. A., Fryer, B. J. and Jackson, S. E. (1990) Inductively coupled plasma-mass spectrometric analysis of geological samples: A critical evaluattion based on case studies. Chem. Geol., 83, 105–1.Google Scholar
McMullin, D., Berman, R. G. and Greenwood, H. J. (1991) Calibration of the SGAM thermobarometer for pelitic rocks using data from phase equilibrium experiments and natural assemblages. Can. Mineral., 29, 889–908.Google Scholar
Moore, J. M., Jr., Hart, S. R., Barnett, C. C. and Hurley, P. M. (1960) Potassium-argon ages in northern Manitoba. Bull. Geol. Soc. Amer. 71, 225-30.Google Scholar
Neiva, A. M. R. (1974) Geochemistry of tourmaline (schorlite) from granites, aplites and pegmatites from northern Portugal. Geochim. Cosmochim. Ada, 38, 1307–17.Google Scholar
Newton, R. C. (1983) Geobarometry of high-grade metamorphic rocks. Amer. J. Sci., 283A, 1-28.Google Scholar
Nicholls, J., Stout, M. Z. and Ghent, E. D. (1991) Characterization of partly-open-system chemical variations in clinopyroxene amphibolite boudins, Three Valley Gap, British Columbia, using Thompson space calculations. Can. Mineral., 29, 633-53.Google Scholar
O'Hara, K. and Blackburn, W. H. (1989) Volume-loss model for trace element enrichments in mylonites. Geology, 17, 524—7.Google Scholar
Owen, J. V. (1993) Syn-metamorphic element transfer across lithological boundaries in the Port-aux-Basques gneiss complex, Newfoundland. Lithos, 29, 217–33.Google Scholar
Rapp, R. P. and Watson, E. B. (1986) Monazite solubility and dissolution kinetics: implications for the thorium and light rare earth chemistry of felsic magmas. Contrib. Mineral. Petrol., 94, 304–16.Google Scholar
Selverstone, J., Morteani, G. and Staude, J.-M. (1991) Fluid channelling during ductile shearing: transformation of granodiorite into aluminous schist in the Tauern Window, Eastern Alps. J. Metamorph. Geol, 9, 419–31.Google Scholar
Taylor, S. R. and McLennan, S. M. (1985) The Continental Crust: its Composition and Evolution. Blackwell, Oxford U.K.Google Scholar
Tuisku, P. (1992) Contact zone interaction of metabasites with metapelites: Amphibolite facies mineral assemblages, chemical profiles and their origin, the Puolankajarvi Formation, Finland. Lithos, 27, 279–300.Google Scholar
Vander Auwera, J. (1993) Diffusion controlled growth of pyroxene-bearing margins on amphi-bolite bands in the granulite facies of Rogaland (Southwestern Norway): implications for granulite formation. Contrib. Mineral. Petrol., 114, 203–20.Google Scholar
Vorbach, A. (1989) Experimental examinations on the stability of synthetic tourmalines in temperatures from 250°C to 750°C and pressures up to 4 kb. Neues Jarhb. Mineral. Abh., 161, 69–83.Google Scholar