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A contribution to the ore genesis of the magnesite deposit of Eugui, Navarra (Spain)

Abstract

In the area of the magnesite deposits of Eugui (Navarra, Spain) studies on illite crystallinity, the degree of graphitization of carbonaceous material, measurements of vitrinite reflectivity, and fluid inclusions have been carried out on dolomites, magnesites, schists, and carbonaceous matter. These rocks have suffered metamorphism of very low to low grade.

The magnesite appears generally concordant with the Namurian dolomitic rocks showing a typically banded structure. The genetic model proposed involves an early Mg concentration during sedimentation (syndiagenetic dolomitization), lateral circulation of saline solutions, and formation of diagenetically crystallized rhythmites (DCR), and final compaction. The formation of magnesite took place under the conditions of low pressure and temperatures close to 150°C, very similar to all strata-bound ore deposits. Deformation and regional metamorphism only caused minor removal, recrystallization, and transformation of the clay minerals and carbonaceous matter.

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References

  1. Arce, R., Olmedo, F., Pesquera, A., Velasco, F.: Metamorfismo de grado bajo y muy bajo en la mitad occidental del macizo de Aldudes (Navarra). I Congr. Esp. Geol. T-II, 15–25 (1984)

  2. Boast, A.M., Swainbank, I.G., Coleman, M.L., Halls, C.: Lead isotopic variation in the Tynagh, Silvermines and Navan base-metal deposits, Ireland, Trans. Inst. Min. Metall. (Sect. B: Appl. Earth Sci.) 90:115–119 (1918)

  3. Bodnar, R.J., Bethe, P.M.: Systematics of stretching of fluid inclusions. I: Fluorite and sphalerite at 1 atmosphere confining pressure. Econ. Geol. 79:141–161 (1984)

  4. Boet, H.V., Krause, H.F., Mohr, K., Müller, R., Pilger, A., Requart, H.: La région de magnesite d'Eugui dans les Pyrénées Occidentales. Pirineos (C:S:I:C:) 111:21–39 (1974)

  5. Bone, Y.: Interpretation of magnesites at Rum Jungle, N.T., using fluid inclusions. J. Geol. Soc. Australia 30:375–381 (1983)

  6. Burrus, R.C.: Hydrocarbon fluid inclusions in studies of sedimentary diagenesis. Mineral. Assoc. Canada. Short Course Handbook, 6:138–156 (1981)

  7. Clar, E.: Über parallel Schräg- und Kreuzbänderung in Spatlagerstätten. Tsch. Min. Petr. Mitt. 4:55–64 (1954)

  8. Destombes, J.P.: Origine métasomatique et age des magnesites (giobertites) des Pyrénées Occidentales. C.R. Acad. Sci. (Paris), Sér. D. 240:1117–1119 (1955)

  9. Destombes, J.P.: Magnésites (giobertites) des Pyrénées Occidentales. Bull. Soc. Géol. France, Sér. 6e 6:461–476 (1956)

  10. Dunoyer, G., Heddebaut, C.: Paleozoique anchimetamorphique à illite, chlorite, pyrophyllite, allevardite et paragonite dans les Pyrénées Basques. Bull. Serv. Carte Géol. Als. Lorr., 24–4. 277–290 (1971)

  11. Fairbridge, R.W.: Syndiagenesis, anadiagenesis, epidiagenesis: phases in lithogenesis. In: Diagenesis in Sediments and Sedimentary Rocks, G., Larsen & G.V. Chilingar, Ed., pp. 17–114. Amsterdam: Elsevier (1983)

  12. Fontboté, L.: Strata-bound Zn-Pb-F-Ba deposits in carbonate rocks: new aspects of paleogeographic location, facies factors and diagenetic evolution. Inaugural Diss. Ruprecht-Karl-Universität, pp. 192 (1981)

  13. Fontboté, L., Amstutz, G.C.: New observations on diagenetic crystallization rhythmites in the carbonate facies of the Triassic of the Alpujarrides (Betic Cordillera, Southern Spain). I Symp. Diagenesis. Barcelona. Rev. Inst. Inv. Geol. 34 (1980)

  14. Gomez de Llarena, J.: La diagénesis en la dolomita y magnesita de Asturreta (Eugui, Navarra). Bol. R. Soc. Esp. Hist. Nat. 66–1:319–337 (1968)

  15. Gomez de Llarena, J.: Contribución al estudio de la génesis de los carbonatos sedimentarios (II III). Bol. R. Soc. Esp. Hist. Nat., 67–70, 111–112, 153–169 (1969, 1972)

  16. Gonzalez López, J.M.: Mineralogía y mineralogénesis del yacimiento de magnesita de Asturreta (Navarra). Tesis doct. Uni. Zaragoza (Spain) Unpublished (1976)

  17. Gonzalez López, J.M., Arrese, F.: Mineralogía y Mineralogénesis del yacimiento de magnesita de Asturreta (Navarra). Estudios geol. 33:35–44 (1977)

  18. Gonzalez López, J.M., Fernandez Nieto, C., Arrese, F., Medina, J.A.: Estudio cristaloquímico de los carbonatos del yacimiento de Eugui. Bol. Geol. Min., 89–2:164–170 (1978)

  19. Heddebaut, C.: Etudes géologiques dans les massifs paléozoiques basques. Thése Univ. Sci. Lille (France). pp. 263 (1973)

  20. Ingerson, E.: Liquid inclusions in geologic thermometry. Am. Mineral. 32/7–8:375–388 (1947)

  21. Itaya, T.: Carbonaceous material in pelitic schist of the Sambagawa metamorphic belt in central Shikoku, Japan, Lithos, 14:215–224 (1981)

  22. Johannes, W.: Zur Entstehung von Magnesitvorkommen. N. Jb. Min. Abh. 113:274–325 (1970)

  23. Kralik, M.: Verbreitung und Genese der Magnesitlagerstätte von Eugui (Asturreta) W Pyrenäen, Spanien. Unveröff. Diss. Univ. Wien. pp 179 (1977)

  24. Kralik, M., Hoefs, J.: Die Isotopenzusammensetzung der Karbonate in der Magnesitlagerstätte Eugui (Westpyrenäen). TMPM Tsch. Min. Petro. Mitt. 25:185–193 (1978)

  25. Krausse, H.F.: Übersicht über die tektonischen Formungen und Strukturen in den Spanischen Westpyrenäen. N: Jb. Geol. Paläont. Abh. 142/1:1–29 (1973)

  26. Kubler, B.: La cristallinité de l'illite et les zones tout à fait superieures du métamorphisme. In: Etages tectoniques. A la Baconniére, Neuchatel (Suisse) 105–121 (1967)

  27. Kubler, B., Pitton, J.L., Heroux, Y., Charrollais, J., Weidmann, M.: Sur le pouvoir reflecteur de la vitrinite dans quelques roches du Jura, de la Molasse et des Nappes Prealpines, Helvetique et Penniques. Eclogae Geol. Helvetiae 72:347–373 (1979)

  28. Landis, C.A.: Graphitization of dispersed carbonaceous material in metamorphic rocks. Contr. Mineral. Petr. 30:34–43 (1971)

  29. Leguey, A., Arrese, F., Rodriguez, J.: Estudio mineralógico del yacimiento de magnesita de Asturreta (Navarra). Bol. R. Soc. Esp. Hist. Nat. 65:241–262 (1967)

  30. Lotze, F.: Referencias de Gomez de Llerena. Geol. Paläont. 1:(3): 334–336 (1955)

  31. Meixner, H.: Sobre los cristales de magnesita y dolomita de Asturreta (Valle alto del Arga, Navarra). Inst. “Lucas Mallada”. Pub. Extra 7–2:141–152 (1953)

  32. Meixner, H.: Verdreifachte Achsenbilder an den Magnesit Kristallen von Asturreta in Spanien. Tsch. Min. Petr. Mitt. 4:1–4 (1954)

  33. Müller, J.: Sur la superposition des deformations dans les Pyrénées occidentales. C. R. Ac. Sci. (Paris). Sér. D-265:400–402 (1967)

  34. Murray, R.C.: Hydrocarbon fluid inclusions in quartz. Am. Assoc. Petrol. Geol. Bull. 41:950–957 (1957)

  35. Petraschek, W.E., Kralik, M., Ranzenbacher, A.: The strata-bound magnesite deposit of Eugui Asturreta in the Spanish Pyrénées. In: Time and Strata Bound Ore Deposits, D.D. Klemm and H.J. Schneider, Ed., pp. 254–259, Berlin-Heidelberg-New York: Springer 1977

  36. Pilger, A.: Zur Genese der Magnesite in den Westpyrenäen. Zt. Geol. Ges. Bd. 111:198–208 (1959)

  37. Pilger, A.: Dévonien supérieur, Carbonifére inférieur et Namurien avec la magnésite d'Eugui au Sud Ouest du massif d'Aldudes Quinto Real dans les Pyrénées Occidentales espagnoles. Pirineos (C.S.-I.C.) 111:129–145 (1974)

  38. Poty, B., Leroy, J., Jachimowicz, L.: Un nouvel appareil pour la mesure des températures sous le microscope: l'installation de microthermométric Chiaxmeca. Boll. Soc. Fr. Minéral. Cristall. 99:182–186 (1976)

  39. Quemeneur, J.M.: Les gisement de magnésite du Pays Basque: Cadre géoligique et sédimentologique; génese de la magnésite en milieu sédimentaire. Diss. Univ. Paris VI, Unpublished, pp. 249 (1974)

  40. Ragot, J.P.: Evolution du degré d'organisation des particules carbonées disséminées dans les roches. Bull. Centre Rech. Pau-SNPA, 10:221–25 (1976)

  41. Robert, P.: The optical evolution of kerogen and geothermal histories applied to oil and gas exploration. In: Insoluble organic matter from sedimentary rocks, B. Durang, Ed., pp. 385–414, Paris: Technicep (1980)

  42. Sassi, F.P., Scolari, A.: The b 0 value of the potassic white micas as a barometric indicator in low-grade metamorphism of pelitic schists. Contr. Mineral. Petrol. 45:143–152 (1974)

  43. Schroll, E.: Geochemical indicator parameters of lead-zinc ore deposits in carbonate rocks. In: Syngenesis and Epigenesis in the Formation of Mineral Deposits. Wauschkuhn, A., et al., Ed., pp. 294–305, Berlin-Heidelberg-New York: Springer 1984

  44. Siegel, W.: Reflections on the origin of sparry magnesite deposits. In: Syngenesis and Epigenesis in the Formation of Mineral Deposits. A. Wauschkuhn et al., Ed., pp. 177–182. Berlin-Heidelberg-New York: Springer 1984

  45. Stach, E., Mackowsky, M.T., Teichmüller, M., Taylor, G.H., Chandra, D., Teichmüller, R.: Coal Petrology, pp. 535, Berlin-Stuttgart: Gebrüder Borntraeger 1982

  46. Tagiri, M.: A measurement of the graphitizing degree by the X-ray powder diffractometer. J. Japan Assoc. Min. Petr. Econ. Geol. 345–352 (1981)

  47. Touray, J.C., Barlier, J.: Liquid and gaseous hydrocarbon inclusions in quartz monocrystals from “Terres Noires” and “Flysch a Helminthoides” (French Alpes). Fortsch. Mineral. Spec. Issue. 52:419–426 (1975)

  48. Valdiya, K.S.: Origin of the magnesite deposits of southern Pithoragar, Himalaya, India. Econ. Geol. 8 (1968)

  49. Velde, B.: Phengite micas: synthesis, stability and natural occurrence. Am. J. Sci. 263:886–913 (1965)

  50. Velde, B., Hower, J.: Petrological significance of illite polymorphism in Paleozoic sedimentary rocks. Am. Mineral. 48:1249–1254 (1963)

  51. Wassojewitsch, N.B., Kortschagina, I.I., Loparin, N.W., Tschernikov, K.A.: Die Hauptphase der Erdölbildung. Z. Angew. Geol. Dtsch. 15–12:611–621 (1969)

  52. Weaver, C.E., Broekstra, B.R.: Illite mica. In: Shale Slate Metamorphism in Southern Appalachiens, C.E. Weaver et al., pp. 67–199, Amsterdam: Elsevier 1984

  53. Wirth, M.: Zur Gliederung des höheren Paläozoikums (Givet Namur) im Gebiet Quinto Real (Westpyrenäen) mit Hilfe von Conodonten. N. Jb. Geol. Paläont. 127–2:179–244 (1967)

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Velasco, F., Pesquera, A., Arce, R. et al. A contribution to the ore genesis of the magnesite deposit of Eugui, Navarra (Spain). Mineral. Deposita 22, 33–41 (1987). https://doi.org/10.1007/BF00204241

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Keywords

  • Recrystallization
  • Compaction
  • Dolomite
  • Clay Mineral
  • Fluid Inclusion