Contributions to Mineralogy and Petrology

, Volume 49, Issue 3, pp 233–257 | Cite as

Petrology of rodingites from the equatorial Mid-Atlantic fracture zones and their geotectonic significance

  • José Honnorez
  • Paul Kirst
Article

Abstract

Rodingites were dredged from fracture zones of the equatorial Mid-Atlantic Ridge along with serpentinized ultramafics, and fresh and metamorphosed basalts and gabbroids. These rodingites were generated by a metasomatic process at low temperature involving an enrichment in lime and water, and a loss of silica and alkalis. The parent rocks were gabbronorites which intruded ultramafic material as it ascended from the upper mantle to its present location in the upper oceanic crust. The gabbronorites were probably altered to rodingites while they were still in the lower oceanic crust. Since the rodingitization process appears to be concomitant, complementary and simultaneous with the serpentinization of the host ultramafic rocks, we infer that the serpentinization process also took place in the deeper part of the oceanic crust. These two simultaneous metasomatic processes thus predate the major phase of tectonic events which uplifted these blocks as cold, solid diapiric emplacements of ultramafic material and accompanying rodingites to their present positions along lines of weakness expressed as fracture zones.

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References

  1. Van Andel, Tj.H., Corliss, J.B., Bowen, V.T.: The intersection between the Mid-Atlantic Ridge and the Vema Fracture Zone in the North Atlantic. J. Marine Res. 25, 343–351 (1967)Google Scholar
  2. Van Andel, Tj.H., Herzen, R.P. von, Phillips, J.D.: The Vema fracture zone and the tectonics of transverse shear zones in oceanic crustal plates. Marine Geophys. Res. 1, 261–283 (1971)Google Scholar
  3. Van Andel, Tj.H., Phillips, J.D., von Herzen, R.P.: Rifting origin for the Vema fracture in the North Atlantic. Earth Planet. Sci. Letters 5, 296–300 (1969)Google Scholar
  4. Aumento, F., Loubat, H.: The Mid-Atlantic Ridge near 45 °N. XVI-Serpentinized ultramafic intrusions. Canad. J. Earth Sci. 8, 631–663 (1971)Google Scholar
  5. Barnes, I., La March, V.C., Jr., Himmelberg, G.: Geochemical evidence of present-day serpentinization. Science 156, 830–832 (1967)Google Scholar
  6. Barnes, I., O'Neil, J.R.: The relationship between fluids in some fresh Alpine-type ultramafics and possible modern serpentinization. Western U.S. GSA Bull. 80, 1947–1960 (1969)Google Scholar
  7. Bell, J.M., Clarke, E. de C., Marshall, P.: The geology of the Dun Mountain subdivision, Nelson: New Zealand Geol. Survey Bull. 12, 1–71 (1911)Google Scholar
  8. Bezzi, A., Piccardo, G.B.: Studi petrografici sulle formazioni ofiolitiche dell'Appennino Ligure. Nota XII — Le rodingiti di Carro (La Spezia). Boll. Soc. Geol. Ital. 88, 645–687 (1969)Google Scholar
  9. Bonatti, E.: Utramafic rooks from the Mid-Atlantic Ridge. Nature 219, 363–364 (1968)Google Scholar
  10. Bonatti, E.: Ancient continental mantle beneath oceanic ridges. J. Geophys. Bes. 76, 3825–3831 (1971)Google Scholar
  11. Bonatti, E.: Origin of offsets of the Mid-Atlantic Ridge in fracture zones. J. Geol. 81, 144–156 (1973)Google Scholar
  12. Bonatti, E., Emiliani, C., Ferrara, G., Honnorez, J., Rydell, H.: Ultramafic-carbonate breccias from the equatorial Mid-Atlantic Ridge. Marine Geol. 16, 83–102 (1974)Google Scholar
  13. Bonatti, E., Honnorez, J.: Nonspreading crustal blocks at the Mid-Atlantic Ridge. Science 174, 1329–1331 (1971)Google Scholar
  14. Bonatti, E., Honnorez, J., Ferrara, G.: Equatorial Mid-Atlantic Ridge: petrologic and Sr isotopic evidence for an Alpine-type rock assemblage. Earth Planet. Sci. Letters 9, 247–256 (1970)Google Scholar
  15. Bonatti, E., Honnorez, J., Ferrara, G.: Peridotite-gabbro-basalt complex from the equatorial Mid-Atlantic-Ridge. Phil. Trans. Roy. Soc. London, Ser. A 268, 385–402 (1971)Google Scholar
  16. Bonatti, E., Honnorez, J., Kirst, P., Radicati, F.: Metagabbros from the Mid-Atlantic Ridge at 6 °N: dynamothermal metamorphism. J. Geol. (in press, 1974)Google Scholar
  17. Buckner, D.A., Roy, D.N., Roy, R.: Studies in the system CaO-AI2O3-SiO2-H2O. Part 2, the system CaSiO2-H2O. Am. J. Sci. 258, 132–147 (1960)Google Scholar
  18. Carey, S.W.: The tectonic approach to continental drift; in “Continental drift” Hobart, University of Tasmania, p. 177–355 (1958)Google Scholar
  19. Carlson, E.T.: Hydrogarnet formation in the system lime-alumina-silica-water. J. Res. Natl. Bur. Std. 56, 327–335 (1956)Google Scholar
  20. Chesterman, C.W.: Intrusive ultrabasic rocks and their metamorphic relationships at Leech Lake Mountain, Mendocino County, California. Proc. Internat. Geol. Cong. 21st, Copenhagen 1960, 13, 208–215 (1960)Google Scholar
  21. Coleman, R.G.:, Jadeite deposits of the Clean Creek area, New Idria district, San Benito County, California. J. Petrol. 2, 209–247 (1961)Google Scholar
  22. Coleman, R.G.: Low-temperature reaction zones and alpine ultramafic rocks of California, Oregon and Washington. U. S. Geol. Surv. Bull. 1247, 49 (1967)Google Scholar
  23. Dal Piaz, G.V.: Eiloni rodingitici zone di reazione a bassa temperatura al contatto tettonico tra serpentine e rocce incassanti nelle alpi occidentali italiane. Rend. Soc. Ital. Mineral. Petrol. 25, 263–315 (1969)Google Scholar
  24. De Loczy, L.: The Brazilian block and the Gondwanaland problem. An. Acad. Brasil. Cienc., 40, 325–331 (1968)Google Scholar
  25. De Loczy, L.: Role of transcurrent faulting in South American tectonic framework. Am. Assoc. Petrol. Geol. Bull. 54, 2111–2119 (1970a)Google Scholar
  26. De Loczy, L.: Tectonismo transversal na America do Sul e suas relacões genéticas com as zonas de fractura das cadeias meio-oceânicas. An. Acad. Brasil. Cienc. 42, 185–205 (1970b)Google Scholar
  27. Dewey, J.F., Bird, J.M.: Mountain belts and the new gloval tectonics. J. Geophys. Rs. 75, 2625–2647 (1970)Google Scholar
  28. Dewey, J.F., Bird, J.M.: Origin and emplacement of the ophiolite suite: Appalachian ophiolites in Newfoundland. J. Geophys. Res. 76, 3179–3206 (1971)Google Scholar
  29. Dietrich, V.: Die Ophiolithe des Oberhalbsteins (Graubunden) und das Ophiolithmaterial der ostschweizerischen Molasseablagerungen, ein petrographischen Vergleich. Europäische Hochschulschriften, Ser. 17, 1, 179 (1969)Google Scholar
  30. Fairbridge, R.W.: Endosphere and interzonal coupling. N. Y. Acad. Sci. Annals 140, 133–142 (1966)Google Scholar
  31. Flint, E.P., McMurdie, H.F., Wells, L.S.: Formation of hydrated calcium silicates at elevated temperatures and pressures. J. Res., U.S. Nat. Bur. Std. 21, 617–638 (1938)Google Scholar
  32. Francis, G.H.: Zoned hydrothermal bodies in the serpentinite mass of Glen. Urguhart (Inverness-shire). Geol. Mag. 92, 433–447 (1955)Google Scholar
  33. Francis, G.H.: The Serpentinite mass in Glen Urguhart, Inverness-shire, Scotland. Am. J. Sci. 254, 201–226 (1956)Google Scholar
  34. Galli, M., Bezzi, A.: Studi petrografici sulla formazione ofiolitica dell’ Appennino Ligure. Nota XI — Le rodingiti di Bargonasco e di Bargone. Rend. Soc. Ital. Mineral. Petrol. 25, 375–397 (1969)Google Scholar
  35. Galli, M., Cortesogno, L.: Studi petrografioi sulle formazioni ofiolitiche dell’ Appennino Ligure. Nota XIII — Fenomeni di metamorfismo di basso grado in alcune rooce della formazione ofiolitica dell’ Appennino Ligure. Rend. Soc. Ital. Mineral. Petrol. 26, 599–647 (1970)Google Scholar
  36. Heezen, B.C., Bunce, E.T., Hersey, J.B., Tharp, M.: Chain and Romanche fracture zones. Deep-Sea Res. 11, 11–33 (1964a)Google Scholar
  37. Heezen, B.C., Gerard, R.D., Tharp, M.: The Vema Fracture Zone in the equatorial Atlantic. J. Geophys. Res. 69, 733–739 (1964b)Google Scholar
  38. Hess, H.H., Otalora, G.: Mineralogical chemical composition of the Mayaguez serpentinite cores, in “A study of serpentinite”. Natl. Acad. Sci.-Natl. Res. Council Publ. 1188, 152–168 (1964)Google Scholar
  39. Honnorez, J., Bonatti, E., Emiliani, C., Brönnimann, J., Furrer, M.A., Meyerhoff, A. A., Mesozoic limestone from the Mid-Atlantic Ridge ? Earth and Planet. Sci. Letters (in press)Google Scholar
  40. Honnorez, J., Honnorez-Guerstein, B. M., Bonatti, E., Keil, K.: Petrology of the gabbronorites from the equatorial Mid-Atlantic fracture zones, (in prep.)Google Scholar
  41. Honnorez, J., Kirst, P., Bonatti, E.: Amphibolites from the Romanche and the Vema fracture zones, equatorial Mid-Atlantic, (in prep.)Google Scholar
  42. Inoue, T., Miyashiro, A.: Occurence of vesuvaniate in nepheline-syenitic rocks of Fukushinzan District, Korea; with general consideration of the relation between the composition and occurence of vesuvianite. J. Geol. Soc. Japan 57, 51–57 (1951)Google Scholar
  43. Karig, D.E.: Ridges and basins of the Tonga-Kermadec island arc system. J. Geophys. Res. 75, 239–254 (1970)Google Scholar
  44. Kitahara, S., Kennedy, G.C.: The calculated equilibrium curves for some reactions in the system MgO-SiO-H2O at pressures up to 30 kilobars. Am. J. Sci. 265, 211–217 (1967)Google Scholar
  45. Krause, D.G.: Equatorial Shear Zone; in “The world rift system”. Canada Geol. Surv. Paper 64-14, 400–443 (1965)Google Scholar
  46. Melson, W.G., Van Andel, Tj.H.: Metamorphism in the Mid-Atlantic Ridge, 22 °N latitude. Marine Geol. 4, 165–186 (1966)Google Scholar
  47. Melson, W.G., Thompson, G.: Layered basic complex in oceanic crust, Romanche Fracture, equatorial Atlantic Ocean. Science 168, 817–820 (1970)Google Scholar
  48. Melson, W.G., Thompson, G.: Petrology of a transform fault zone and adjacent ridge segments. Phil. Trans. Roy Soc. London, Ser. A 268, 423–441 (1971)Google Scholar
  49. Melson, W.G., Thompson, G., Van Andel, Tj.H.: Voleanism and metamorphism in the Mid-Atlantic Ridge, 22 °N latitude. J. Geophys. Res. 73, 5925–5941 (1968)Google Scholar
  50. Mellis, O.: Die Sedimentation in der Romanche-Tiefe (ein Beitrag zur Erklärung der Entstehung des Tiefseesandes in Atlantischen Ozean). Geol. Rundschau 47, 218–234 (1958)Google Scholar
  51. Miyashiro, A.: Metamorphism and related magmatism in plate tectonics. Am. J. Sci. 272, 629–656 (1972)Google Scholar
  52. Miyashiro, A.: Metamorphism and metamorphic belts, p. 492. New York: John Wiley and Sons 1973Google Scholar
  53. Miyashiro, A.: Classification, characteristics, and origin of ophiolites. J. Geol. (in press)Google Scholar
  54. Miyashiro, A., Shido, F., Ewing, M.: Metamorphism in the Mid-Atlantic Ridge near 24 ° and 30 °N. Phil. Trans. Roy Soc. London, Ser. A 286, 589–604 (1971)Google Scholar
  55. Moore, E.M., Vine, F.J.: The Troodos Massif, Cyprus and other ophiolites as oceanic crust: evaluation and implications. Phil. Trans. Roy. Soc. London, Ser. A 268, 443–466 (1971)Google Scholar
  56. O'Brien, J.P.: Alpine type serpentinites of the Auckland Province. Unpubl. M. S. Univ. of Auckland (1970)Google Scholar
  57. O'Brien, J.P., Rodgers, K.A.: Xonotlite and rodingites from Wairere, New Zealand. Mineral. Mag. 39, 233–240 (1973)Google Scholar
  58. Phillips, A.H., Hess, H.H.: Metamorphic differentiation at contacts between serpentine and siliceous country rocks. Am. Mineralogist 21, 333–362 (1936)Google Scholar
  59. Pistorius, C.W.F.T., Kennedy, G.C.: Stability relations of grossularite and hydrogrossularite at high temperatures and pressures. Am. J. Sci. 258, 247–257 (1960)Google Scholar
  60. Ploshko, V.V., Bogdanov, Yu.A., Emel'yanov, E.M., Knyazeva, D.N.: Gabbroic rocks from the Romanche Trench (Atlantic Ocean). [In Russian.] Dokl. Akad. Nauk SSSR 192, 615–619 (1970)Google Scholar
  61. Poldevaart, A.: Chemistry of the earth's crust; in Poldevaart, A., ed., “Crust of the earth — a Symposium”. Geol. Soc. Am. Spec. Papers 62, 119–145 (1955)Google Scholar
  62. Seki, Y.: Chemical characters of the grossularite-andradite mineral series in rodingites. Jap. J. Geol. Geogr. 36, 1–16 (1965)Google Scholar
  63. Streckeisen, A.: Classification and nomenclature of igneous rocks. Neues Jahrb. Mineral. Abhandl. 107, 144–240 (1967)Google Scholar
  64. Streckeisen, A.: Plutonic rocks: Classification and nomenclature recommended by the UIGS subcommission on the systematics of igneous rocks. Geotimes 18, 25–30 (1973)Google Scholar
  65. Thayer, T.P.: Serpentinization considered as a constant volume metasomatic process. Am. Mineralogist 51, 685–709 (1966)Google Scholar
  66. Thompson, G., Melson, W.G.: The petrology of oceanic crust across fracture zones in the Atlantic Ocean: evidence of a new kind a seafloor spreading. J. Geol. 80, 526–538 (1972)Google Scholar
  67. Vuagnat, M.: Quelques reflexions sur les ophisphérites et les rodingites. Eend. Soc. Mineral. Ital. 23, 471–482 (1967)Google Scholar
  68. Yoder, H.S.: Stability relations of grossularite. J. Geol. 58, 221–253 (1950)Google Scholar
  69. Zabinski, W.: Studium mineralów grupy hydrogranatu. Bozp. Ak. Górniczo-Hutnicza W Krakowie 102, 1–91 (1965)Google Scholar

Copyright information

© Springer-Verlag 1975

Authors and Affiliations

  • José Honnorez
    • 1
  • Paul Kirst
    • 2
  1. 1.School of Marine and Atmospheric ScienceUniversity of MiamiUSA
  2. 2.Miami-Bade Community CollegeUSA

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