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Gabbroic Dikelets in Serpentinized Peridotites from the Mid-Atlantic Ridge at 23°20’N

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Mantle and Lower Crust Exposed in Oceanic Ridges and in Ophiolites

Part of the book series: Petrology and Structural Geology ((PESG,volume 6))

Abstract

Mantle-derived peridotites sampled on the seafloor at 23° N along the MidAtlantic Ridge during the Hydrosnake and R.V. Akademic Mstislav Keldysh cruises show evidence of minor magmatic intrusion that produced millimetre to centimetre thick gabbroic dikelets. The nature of the intruding magma and the time relationships between intrusion events and tectonic evolution of the host peridotites is inferred from the mineralogy and textural features of veins cutting the peridotites. The occurrence of Fe-Ti-rich minerals and of zircon in the veins suggests an evolved, basaltic composition of the fluid. Pyroxene-rich, plagioclase-free veins probably represent pyroxenite dikelets inside the peridotites. In all cases, melt intrusion followed ductile deformation affecting the mantle-derived ultramafics. These observations fit with a model in which gabbroic intrusions are emplaced in mantle rocks at shallow depths beneath the ridge axis.

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References

  • Agrinier, P., Mével, C. and Girardeau, J., 1988. Hydrothermal alteration of the peridotites cored at the ocean/continent boundary of the Iberian margin: petrologic and stable isotope evidence. In: G. Boillot, E.L. Winterer et al. (Editors), Proc. of the ODP, Scientific Results, 103: 225–234.

    Google Scholar 

  • Aumento, F. and Loubat, H., 1971. The Mid-Atlantic Ridge near 45°N. XVI. Serpentinized ultramafic intrusions. Canad. Journ. Earth Sci., 8: 631–663.

    Article  Google Scholar 

  • Benn, K., Nicolas, A. and Reuber, I., 1988. Mantle-crust transition zone and origin of wehrlitic magmas: evidence from the Oman ophiolite. Tectonophysics, 151: 75–85.

    Article  Google Scholar 

  • Bergès, J.P.,1989. Modélisation gravimétrique de la ride Médio-Atlantique: mur Ouest et Snake Pit à la latitude 23°20′N, Rapport DEA, Université de Paris VI.

    Google Scholar 

  • Bloomer, S.H., Natland, J.H. and Fisher, R.L., 1989. Mineral relationships in gabbroic rocks from fracture zones of Indian Ocean ridges: evidence for extensive fractionation, parental diversity, and boundary-layer recrystallization. In: A.D. Saunders and M.J. Norry (Editors), Magmatism in the Ocean Basins. Geol. Soc. London Spec. Publ., 42: 107–124.

    Google Scholar 

  • Blundy, J.D. and Holland, T.J.B., 1990. Calcic amphibole equilibria and a new amphibole-plagioclase geothermometer. Contrib. Mineral. Petrol., 104: 208–224.

    Article  Google Scholar 

  • Bonatti, E., Honnorez, J., Kirst, P. and Radicati, F., 1975. Metagabbros from the Mid-Atlantic Ridge at 6°N: Contact-hydrothermal-dynamic metamorphism beneath the axial valley. Journ. Geol., 83: 61–78.

    Article  Google Scholar 

  • Bonatti, E. and Michael, P.J., 1989. Mantle peridotites from continental rifts to ocean basins to subduction zones. Earth Planet. Sci. Lett., 91: 297–311.

    Article  Google Scholar 

  • Bonatti, E., Peyve, A., Kepezhinskas, P., Kurentsova, N., Seyler, M., Skolotnev, S., and Udintsev, G., 1992. Upper mantle heterogeneity below the Mid-Atlantic Ridge, 0°-15°N. J. Geophys. Res., 97: 4461–4476.

    Article  Google Scholar 

  • Boudier, F., 1979. Microstructural studies of three peridotite samples drilled at the western margin of the midAtlantic Ridge. Init. Repts. of the DSDP 45: 603–608.

    Google Scholar 

  • Bougault, H., Cande, S.C., et al., 1985. Initial Reports of the Deep Sea Drilling Project, 82, Washington.

    Google Scholar 

  • Bougault, H., Charlou, J. L., Fouquet, Y. and Needham, H.D., 1990. Campagne RIDELENTE, structure de la dorsale Atlantique, hétérogenité du manteau et hydrothermalisme. Oceanol. Acta, Vol. Spec., 10: 366–381.

    Google Scholar 

  • Brown, G.M., 1957. Pyroxenes from the early and middle stages of fractionation of the Skaergaard intrusion, East Greenland. Mineral. Mag., 31: 511–543.

    Article  Google Scholar 

  • Brown, G.M. and Vincent, E.A., 1963. Pyroxenes from the late stages of fractionation of the Skaergaard intrusion. J. Petrol., 4: 175–197.

    Article  Google Scholar 

  • Cannat, M., 1993. Emplacement of mantle rocks in the seafloor at mid-ocean ridges. J. Geophys. Res., 98: 4163–4172.

    Article  Google Scholar 

  • Cannat, M., Bideau, D. and Bougault, H., 1992. Serpentinized peridotites and gabbros in the Mid-Atlantic Ridge axial valley at 15°37′N and 16°52′N. Earth Planet. Sci. Lett., 109: 87–106.

    Article  Google Scholar 

  • Cannat, M., Juteau, T. and Berger, E., 1991. Petrostructural analyses of the leg 109 serpentinized peridotites. In: R.S. Detrick, J. Honnorez, W.B. Bryan, T. Juteau, et al. (Editors), Proc. of the ODP, Scientific Results, 109: 47–56.

    Google Scholar 

  • Casey, J.F., 1986. Ultramafic rocks from the MAR at 23° N: evidence for high temperature hydration and high temperature-low to moderate stress deformation of mantle tectonites beneath the median valley. Eos, 67: 1214.

    Article  Google Scholar 

  • Ceuleneer, G., Nicolas, A. and Boudier, F., 1988. Mantle flow patterns at an oceanic spreading centre: the Oman peridotites record. Tectonophysics, 151: 1–26.

    Article  Google Scholar 

  • Cormier, M.H., Detrick, R.S. and Purdy, G.M., 1984. Anomalously thin crust in oceanic fracture zones; new seismic constraints from the Kane fracture zone. J. Geophys. Res., 89: 10244–10266.

    Article  Google Scholar 

  • Detrick, R.S., Fox, P. J., Kastens, K., Ryan, WB.F., Mayer, L., Karson, J. and Pockalny, R., 1984. A SeaBeam survey of the Kane fracture zone and adjacent Mid-Atlantic ridge rift valley. Eos, 65: 1006.

    Article  Google Scholar 

  • Detrick, R.S., Honnorez, J., Bryan, WB., Juteau, T., et al., 1988. Proceeding of the Ocean Drilling Program, Init. Repts., 106/109, College Station, TX.

    Book  Google Scholar 

  • Dick, H.J.B., 1989. Abyssal peridotites, very slow spreading ridges and ocean ridge magmatism, In: A.D. Saunders and M.J. Norris (Editors), Magmatism in the Ocean Basins. Geol. Soc. London Spec. Publ., 42: 71–105.

    Google Scholar 

  • Dick, H.J.B., Fisher, R.L. and Bryan, WB., 1984. Mineralogic variability of the uppermost mantle along midocean ridges. Earth Planet. Sci. Lett., 69: 88–106.

    Article  Google Scholar 

  • Droop, G.T.R., 1987. A general equation for estimating Fe3+ concentrations in ferromagnesian silicates and oxides from microprobe analyses, using stoichiometric criteria. Mineral. Magazine, 51: 431–435.

    Article  Google Scholar 

  • Dungan, M.A., 1979. A microprobe study of antigorite and some serpentine pseudomorphs. Canad. Mineral., 17: 771–784.

    Google Scholar 

  • Engel, C.G. and Fisher, R.L., 1975. Granitic to ultramafic rock complexes of the Indian Ocean ridge system, western Indian Ocean. Geol. Soc. Am. Bull., 86: 1553–1578.

    Article  Google Scholar 

  • Fisher, R.L., Dick, H.J.B., Natland, J.H. and Meyer, P.S., 1986. Mafic-ultramafic suites of the slowly spreading Southwest Indian Ridge: PROTEA exploration of the Antarctic plate boundary, 24°E-47°E. Ofioliti, 11: 147–178.

    Google Scholar 

  • Fox, P.J. and Gallo, D.G., 1984. A tectonic model for ridge-transform-ridge plate boundaries: implications for the structure of the oceanic lithosphere. Tectonophysics, 104: 205–242.

    Article  Google Scholar 

  • Francis, T.G., 1981. Serpentinization faults and their role in the tectonics of slow-spreading ridges. J. Geophys. Res. 86: 11616–11622.

    Article  Google Scholar 

  • Fryer, P., Pearce, J.A., Stokking, L.B., et al., 1990. Proceeding of the Ocean Drilling Program. Init. Repts., 125, College Station, TX.

    Google Scholar 

  • Gente, P., Zonenshain, L.P., Kuzmin, M., Lisitsin, A.P., Bodganov, Y.A. et Baranov, B.V., 1989. Géologie de l’axe de la dorsale médio-atlantique entre 23° et 26°N: résultats préliminaires de la 15eme campagne du N.O. Akademik Mtislav Keldysh (mars-avril 1988). C.R. Acad. Sci. Paris, 308: 1781–1788.

    Google Scholar 

  • Gillis, K.M., Thompson, G., and Kelley, D.S.,1993. A view of the lower crustal component of hydrothermal systems at the Mid-Atlantic Ridge. J. Geophys. Res., 98: 19597–19619.

    Article  Google Scholar 

  • Hamlyn, P.R. and Bonatti, E., 1980. Petrology of mantle-derived ultramafics from the Owen Fracture Zone, Northwest Indian Ocean: implications for the nature of the oceanic upper mantle. Earth Planet. Sci. Lett., 48: 65–79.

    Article  Google Scholar 

  • Harper, G.D.,1984. The Josephine ophiolite. Geol. Soc. Am. Bull., 95: 1009–1026.

    Article  Google Scholar 

  • Hébert, R., Serri, G. and Hékinian, R., 1989. Mineral chemistry of ultramafic to gabbroic cumulates from the major oceanic basins and Northern Apennine ophiolites (Italy) — A comparison. Chem. Geol., 77: 183–207.

    Article  Google Scholar 

  • Juteau, T., Berger, E. and Cannat, M., 1990. Serpentinized, residual mantle peridotites from the M.A.R. Median valley, ODP Hole 670A (21°10′N, 45°02′W, Leg 109): primary mineralogy and geothermometry. In: R.S. Detrick, J. Honnorez, W.B. Bryan, T. Juteau, et al. (Editors), Proc. of the ODP, Scientific Results, 109: 27–45.

    Google Scholar 

  • Karson, J.A., 1991. Seafloor spreading on the Mid-Atlantic Ridge: implications for the structure of ophiolites and oceanic lithosphere produced in slow-spreading environments. In: J. Malpas, M.J. Moores, A. Panayiotou and C. Xenophontos (Editors), Proc. Symp. Troodos 1987, Geol. Surv. Dep., Nicosia, Cyprus, pp. 547–555.

    Google Scholar 

  • Karson, J.A. and Dick, H.J.B., 1983. Tectonics of ridge-transform intersections at the Kane fracture zone. Mar. Geophys. Res., 6: 51–98.

    Article  Google Scholar 

  • Karson, J.A., Collins, J.A. and Casey, J.F., 1984. Geologic and seismic velocity structure of the crust/mantle transition in the Bay of Islands ophiolite complex. J. Geophys. Res., 89: 6126–6138.

    Article  Google Scholar 

  • Karson, J.A., Thompson, G., Humphris, S.E., Edmond, J.M., Bryan, WB., Brown, J.R., Winters, A.T., Pockalny, R.A., Casey, J.F., Campbell, A.C., Klinkhammer, C., Palmer, M.R., Kinzler, R.J. and Sulanowska, M.M., 1987. Along axis variations in seafloor spreading in the MARK area. Nature, 328: 681–685.

    Article  Google Scholar 

  • Kirby, S.H.,1983. Rheology of the lithosphere. Rev. Geophys., 21: 1458–1483.

    Article  Google Scholar 

  • Kong, L.S.L., Detrick, R.S., Fox, P.J., Mayer, L.A. and Ryan, W.B.F., 1988. The morphology and tetconics of the Mark area from SeaBeam and SeaMark I observations (Mid-Atlantic Ridge 23° N). Mar. Geophys. Res., 10: 59–90.

    Article  Google Scholar 

  • Leake, B.E., 1965. The relationship between composition of calciferous amphiboles and grade of metamorphism, In: W.S. Pitcher and G.W. Flinn (Editors), Controls of metamorphism, Edimburgh and London, Oliver & Boyd, pp. 299–318.

    Google Scholar 

  • Leake, B.E.,1978. Nomenclature of amphiboles. Can. Mineral.,16: 501–520.

    Google Scholar 

  • Liou, J.G., Kuniyoshi, S. and Ito, K., 1974. Experimental studies of the phase relations between greenshist and amphibolite in a basaltic system. Am. J. Sci., 274: 613–632.

    Article  Google Scholar 

  • Manning, C.E. and Bird, D.K., 1986. Hydrothermal clinopyroxenes of the Skaergaard intrusion. Contrib. Mineral. Petrol., 92: 437–447.

    Article  Google Scholar 

  • Melson, W.G., Rabinowitz, P.D., et al., 1978. Initial Reports of the Deep Sea Drilling Project, 45, Washington.

    Google Scholar 

  • Mercier, J.-C. C. and Nicolas, A., 1975. Textures and fabrics of upper-mantle peridotites as illustrated by xenoliths from basalts. J. Petrol., 16: 454–487.

    Google Scholar 

  • Mével, C., Auzende, J.M., Cannat, M., Dubois, J., Fouquet, Y, Gente, P., Donval, J.P., Grimaud, D., Karson, J.A., Segonzac, M. and Stievenard, M., 1988. HYDROSNAKE 1988: submersible study of seafloor spreading in the MARK area, abstract) AGU, EOS, 69: 1439.

    Google Scholar 

  • Mével, C., Cannat, M., Pascal, G., Marion, E., Auzende, J.M. and Karson, J.A., 1991. Emplacement of deep crustal and mantle rocks on the west median valley wall of the MARK area (MAR, 23°N). Tectonophysics, 190: 31–53.

    Article  Google Scholar 

  • Michael, P.J. and Bonatti, E., 1985. Peridotite composition from the North Atlantic: regional and tectonic variations and implications for partial melting. Earth Planet. Sci. Lett., 73: 91–104.

    Article  Google Scholar 

  • Morris, E. and Detrick, R.S., 1991. Three-dimensional analysis of gravity anomalies in the MARK area (MAR, 23°N). J. Geophys. Res., 96: 4355–4366.

    Article  Google Scholar 

  • Nicolas, A. and Jackson, M., 1982. High temperature dikes in peridotites: origin by hydraulic fracturing. J. Petrol., 23: 568–582.

    Article  Google Scholar 

  • Nicolas, A. and Poirier, J.P.,1976. Crystalline plasticity and solid state flow in metamorphic rocks, Wiley, London.

    Google Scholar 

  • Nicolas, A. and Prinzhofer, A., 1983. Cumulative or residual origin for the transition zone in ophiolites: structural evidence. J. Petrol., 24: 188–206.

    Article  Google Scholar 

  • Nicolas, A., Reuber, I. and Benn, K., 1988. A new magma chamber model based on structural studies in the Oman ophiolite. Tectonophysics, 151: 87–105.

    Article  Google Scholar 

  • Nwe, Y.Y., 1976. Electron probe studies of the earlier pyroxenes and olivines from the Skaergaard intrusion, East Greenland. Contrib. Mineral. Petrol., 55: 105–126.

    Article  Google Scholar 

  • Phillips, J.D., Thompson, G., Bowen, V.T. and Von Herzen, R.P., 1968. Geophysical and geological study of the Mid-Atlantic Ridge. Trans. Amer. Geophys. Union, 49: 327–328.

    Google Scholar 

  • Pockalny, R.A., Detrick, R.S. and Fox, P.J., 1988. Morphology and tectonics of the Kane transform from seabeam bathymetry data. J. Geophys. Res., 93: 3179–3193.

    Article  Google Scholar 

  • Prichard, H.M., 1979. A petrographic study of the process of serpentinization in ophiolites and ocean crust. Contrib. Mineral. Petrol., 68: 231–241.

    Article  Google Scholar 

  • Purdy, G.M. and Detrick, R.S., 1986. Crustal structure of the Mid-Atlantic Ridge at 23°N from seismic refraction studies. J. Geophys. Res., 91: 3739–3762.

    Article  Google Scholar 

  • Robinson, P., Spear, F.S., Schumaker, J.C., Laird, K., Klein, C., Evans, B.W. and Doolan, B.W, 1981. Phase relations of metamorphic amphiboles: natural occurrence and theory. In: D. Veblen (Editor), Amphiboles and other hydrous pyroboles-Mineralogy, MSA Rev. Mineral., 9B.

    Google Scholar 

  • Rock, N.M.S. and Carroll, G.W, 1990. MINTAB: a general-purpose mineral recalculation and tabulation program for Macintosh microcomputers. Am. Mineral., 75: 424–430.

    Google Scholar 

  • Rona, P.A., Widenfalk, L. and Boström, K., 1987. Serpentinized ultramafics and hydrothermal activity at the Mid-Atlantic Ridge crest near 15° N. J. Geophys. Res., 92: 1417–1427.

    Article  Google Scholar 

  • Schulz, N.J., Detrick, R.S. and Miller, S.P.,1988. Two and three dimensional inversions of magnetic anomalies in the MARK area (Mid-Atlantic Ridge 23°N). Mar. Geophys. Res., 10: 41–57.

    Article  Google Scholar 

  • Severinghaus, J.P. and Macdonald, K.C., 1988. High inside corners at ridge-transform intersections. Mar. Geophys. Res., 9: 353–367.

    Article  Google Scholar 

  • Sinton, J.M., 1979. Petrology of (alpine-type) peridotites from site 395, DSDP Leg 45. In: W.G. Melson, P.D. Rabinowitz et al. (Editors), Init. Repts. of the DSDP, 45: 595–601.

    Google Scholar 

  • Sleep, N.H., 1975. Formation of ocean crust: some thermal constraints. J. Geophys. Res., 80: 4037–4042.

    Article  Google Scholar 

  • Spear, F.S., 1981. An experimental study of hornblende stability and compositional variability in amphibolite. Am., J., Sci., 281: 697–734.

    Article  Google Scholar 

  • Stakes, D., Mével, C., Cannat, M., and Chaput, T., 1991. Metamorphic stratigraphy of hole 735B. Proc. of the ODP, Scientific Results, 118: 153–180.

    Google Scholar 

  • Tiezzi, L.J. and Scott, R.B., 1980. Crystal fractionation in a cumulate gabbro, Mid-Atlantic Ridge, 26° N. J. Geophys. Res., 85: 5438–5454.

    Article  Google Scholar 

  • Tucholke, B.E. and Schouten, H., 1988. Kane fracture zone. Mar. Geophys. Res., 10: 1–39.

    Article  Google Scholar 

  • Vieten, K. and Hamm, H.M., 1978. Additional notes “On the calculation of the crystal chemical formula of clinopyroxenes and their content of Fe3+ from microprobe analyses”. Neues Jahrb. Mineral. Monatshefte, 2: 71–83.

    Google Scholar 

  • Wicks, F.J. and Whittaker, E.J.W., 1977. Serpentine texture and serpentinization. Can. Mineral., 13: 244–258.

    Google Scholar 

  • Zonenshain, L.P., Kusmin, M.I., Lisitsin, A.P., Bogdanov, Yu.A. and Baranov, B.V., 1989. Tectonics of the Mid Atlantic rift valley between the TAG and MARK areas (26–24° N): evidence for vertical tectonism. Tectonophysics, 159: 1–23.

    Article  Google Scholar 

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Authors and Affiliations

  1. Dipart. di Geologia, Paleontologia e Geofisica, Università di Padova, Via Giotto 1, 35137, Padova, Italy

    P. Tartarotti

  2. Laboratoire de Pétrologie, Université de Paris VI, 4 Place Jussieu, 75251, Paris Cedex 05, France

    M. Cannat & C. Mevel

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  1. P. Tartarotti
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  2. M. Cannat
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  3. C. Mevel
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Editors and Affiliations

  1. Faculty of Earth Sciences, Geodynamics Research Institute, Utrecht, The Netherlands

    R. L. M. Vissers

  2. Laboratoire de Tectonophysique, Université des Sciences et Techniques du Languedoc, Montpellier, France

    A. Nicolas

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Tartarotti, P., Cannat, M., Mevel, C. (1995). Gabbroic Dikelets in Serpentinized Peridotites from the Mid-Atlantic Ridge at 23°20’N. In: Vissers, R.L.M., Nicolas, A. (eds) Mantle and Lower Crust Exposed in Oceanic Ridges and in Ophiolites. Petrology and Structural Geology, vol 6. Springer, Dordrecht. https://doi.org/10.1007/978-94-015-8585-9_3

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  • DOI: https://doi.org/10.1007/978-94-015-8585-9_3

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