Abstract
Petrological and experimental studies demonstrated that nepheline-normative, SiO2-rich melts can be present in the upper mantle at pressures ≤1.5 GPa. To evaluate the role of such melts in mantle processes and magma genesis, we carried out two types of experiments: (1) melt distribution experiments to characterize the grain-scale distribution of a small fraction of typical SiO2-rich mantle melt (SRMM) in polycrystalline olivine (Ol) at 1,180°C, 1.2 GPa; and (2) an infiltration experiment to test the ability of SRMM to impregnate and metasomatise neighbouring non-molten mantle rocks. The median dihedral angles at Ol-Ol-SRMM contacts are equal to ≈50°, implying that melt should be interconnected at all melt fractions. Complications arise, however, in the investigated system because Ol–liquid interfacial energy is anisotropic, and we estimate that the connectivity threshold in the SRMM–Ol system is ≈0.3 vol%. Regarding the very low volume fraction of SRMM in peridotites, we conclude that these melts either occur as isolated pockets or form a network of grain edge channels with a low degree of connectivity due to a large number of dry grain edges. Even in the case where an interconnected network exists, their large viscosities should prohibit the extraction of SRMM from peridotite sources. The infiltration experiment also points to a very reduced mobility of SRMM in the upper mantle. In this experiment, a slice of synthetic dunite was immersed into a magma reservoir made of 60 wt% SRMM+40 wt% Ol, and subjected to 1,180°C-1.2 GPa for 113 h: despite this long duration, the SiO2-rich liquid was unable to infiltrate measurably the dunite. Our experiments do not support the hypothesis that SRMM represent agents of mantle metasomatism.
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References
Albarede F, Provost A (1977) Petrological and geochemical mass-balance equations: an algorithm for least-square fitting and general error analysis Comp Geosci 3:309–326
Baker DR (1992) Estimation of diffusion coefficients during interdiffusion of geologic melts: application of transition state theory. Chem Geol 98:11–21
Baker MB, Hirschmann MM, Ghiorso MS, Stolper EM (1995) Compositions of near-solidus peridotite melts from experiments and thermodynamic calculations. Nature 375:308–311
Baker MB, Hirschmann MM, Wasylenki LE, Stolper EM, Ghiorso MS (1996) Quest for low-degree mantle melts. Nature 381:286
von Bargen N, Waff HS (1986) Permeabilities, interfacial areas and curvatures of partially molten systems: results of numerical computations of equilibrium microstructures. J Geophys Res 91:9261–9276
von Bargen N, Waff HS (1988) Wetting of enstatite by basaltic melt at 1,350°C and 1.0- to 2.5-GPa pressure. J Geophys Res 93:1153–1158
Bottinga Y, Weill DF (1969) Density of liquid silicate systems calculated from molar volumes of oxyde components. Am J Sci 269:169–182
Brenan JM (1993) Diffusion of chlorine in fluid-bearing quartzite: effects of fluid composition and total porosity. Contrib Miner Petrol 115:215–224
Bulau JR, Waff HS, Tyburczy JA (1979) Mechanical and thermodynamical constraints on fluid distribution in partial melts. J Geophys Res 84:6102–6108
Clemens JD, Mawer CK (1992) Granitic magma transport by fracture propagation. Tectonophysics 204:339–360
Cmíral M, Fitz Gerald JD, Faul UH, Green DH (1998) A close look at dihedral angles and melt geometry in olivine-basalt aggregates: a TEM study. Contrib Miner Petrol 130:336–345
Daines MJ, Kohlstedt DL (1993) A laboratory study of melt migration. Phil Trans R Soc Lond A 342:43–52
Draper DS (1992) Spinel lherzolite xenoliths from Lorena Butte, Simcoe Mountains, southern Washington (USA). J Geol 100:766–776
Draper DS, Green TH (1997) P-T phase relations of silicic, alkaline, aluminous mantle xenolith glasses under anhydrous and C-O-H fluid saturated conditions. J Petrol 38:1187–1224
Draper DS, Green TH (1999) P-T phase relations of silicic, alkaline, aluminous liquids: new results and applications to mantle melting and metasomatism. Earth Planet Sci Lett 170:255–268
Faul UH (2001) Melt detention and segregation beneath mid-ocean ridges. Nature 410:920–923
Frank CF (1968) Two-component flow model for convection in the Earth’s upper mantle. Nature 220:350–352
Frey FA, Green DH (1974) The mineralogy, geochemistry and origin of lherzolite inclusions in Victorian basanites. Geochim Cosmochim Acta 38:1023–1059
Fujii N, Osamura K, Takahashi E (1986) Effect of water saturation on the distribution of partial melt in the olivine-pyroxene-plagioclase system. J Geophys Res 91:9253–9259
Gaetani GA, Grove TL (1998) The influence of water on melting of mantle peridotite. Contrib Miner Petrol 131:323–346
Gleason GC, Bruce V, Green HW (1999) Experimental investigation of melt topology in partially molten quartzo-feldspathic aggregates under hydrostatic and non-hydrostatic stress. J Metamorphic Geol 17:705–722
Hammouda T, Laporte D (2000) Ultra-fast mantle impregnation by carbonatite melts. Geology 28:283–285
Hirschmann MM, Baker MB, Stolper EM (1998) Effect of alkalis on the silica content of mantle derived melts. Geochim Cosmochim Acta 62:883–902
Holtzman BK, Groebner NJ, Zimmerman ME, Ginsberg SB, Kohlstedt DL (2003) Stress-driven melt segregation in partially molten rocks. Geochem Geophys Geosyst 4. DOI 10.1029/2001GC000258
Jurewicz SR, Jurewicz AJG (1986) Distribution of apparent angles on random sections with emphasis on dihedral angle measurements. J Geophys Res 91:9277–9282
Jurewicz SR, Watson EB (1984) Distribution of partial melt in a felsic system: the importance of surface energy. Contrib Miner Petrol 85:25–29
Laporte D, Provost A (2000a) The grain scale distribution of silicate, carbonate and metallosulfide partial melts: a review of theory and experiments. In: Bagdassarov N, Laporte D, Thompson AB (eds) Physics and chemistry of partially molten rocks. Kluwer, Dordrecht, pp 93–140
Laporte D, Provost A (2000b) The equilibrium geometry of a fluid phase in a polycrystalline aggregate with anisotropic surface energies: dry grain boundaries. J Geophys Res 105:25937–25953
Laporte D, Watson EB (1995) Experimental and theoretical constraints on melt distribution in crustal sources: the effect of crystalline anisotropy on melt interconnectivity. Chem Geol 124:161–184
Laporte D, Rapaille C, Provost A (1997) Wetting angles, equilibrium melt geometry, and the permeability threshold of partially molten crustal protoliths. In: Bouchez JL, Hutton DH, Stephens WE (eds) Granites: from segregation of melt to emplacement fabrics. Kluwer, Amsterdam, pp 31–54
Laporte D, Toplis M, Seyler M, Devidal JL (2004) A new experimental technique for extracting liquids from peridotite at very low degrees of melting. Application to partial melting of depleted peridotite. Contrib Miner Petrol 146:463–484
McKenzie D (1984) The generation and compaction of partially molten rock. J Petrol 25:713–765
McKenzie D (1989) Some remarks on the movement of small melt fractions in the mantle. Earth Planet Sci Lett 95:53–72
Minarik WG, Watson EB (1995) Interconnectivity of carbonate melt at low melt fraction. Earth Planet Sci Lett 133:423–437
Neumann ER, Wulff-Pedersen E (1997) The origin of highly silicic glass in mantle xenoliths from the Canary Islands. J Petrol 38:1513–1539
Park HH, Yoon DN (1985) Effect of dihedral angle on the morphology of grains in a matrix phase. Metal Trans 16:923–928
Pin C, Paquette JL, Monchoux P, Hammouda T (2001) First field-scale occurrence of Si-Al-Na-rich low-degree partial melts from the upper mantle. Geology 29:451–454
Riegger OK, van Vlack LH (1960) Dihedral angle measurement. AIME Trans 218:933–935
Riley GNJ, Kohlstedt DL (1991) Kinetics of melt migration in upper mantle-type rocks. Earth Planet Sci Lett 105:500–521
Robinson JAC, Wood BJ, Blundy JD (1998) The beginning of melting of fertile and depleted peridotite at 1.5 GPa. Earth Planet Sci Lett 155:97–111
Rutter EH (1997) The influence of deformation on the extraction of crustal melts : a consideration of the role of melt-assisted granular flow. In: Holness MB (ed) Deformation-enhanced fluid transport in the Earth’s crust and mantle. Chapman and Hall, London, pp 82–110
Rutter EH, Neumann DHK (1995) Experimental deformation of partially molten Westerly granite under fluid-absent conditions, with implications for the extraction of granitic magmas. J Geophys Res 100:15697–15715
Schiano P, Bourdon B (1999) On the preservation of mantle information in ultramafic nodules: glass inclusions within minerals versus interstitial glasses. Earth Planet Sci Lett 169:173–188
Schiano P, Clocchiatti R (1994) World-wide occurrence of silica-rich melts trapped in sub-continental and sub-oceanic mantle minerals. Nature 368:621–624
Schiano P, Bourdon B, Clochiatti R, Massare D, Varela ME, Bottinga Y (1998) Low-degree partial melting trends recorded in upper mantle minerals. Earth Planet Sci Lett 160:537–550
Scott DR, Stevenson DJ (1986) Magma ascent by porous flow. J Geophys Res 91:9283–9296
Shaw HR (1972) Viscosities of magmatic silicate liquids: an empirical method of prediction. Am J Sci 272:870–893
Sleep NH (1988) Tapping of melt by veins and dykes. J Geophys Res 93:10255–10272
Smith CS (1964) Some elementary principles of polycrystalline microstructure. Metall Rev 9:1–48
Stevenson DJ (1986) on the role of surface tension in the migration of melts and fluids. Geophys Res Lett 13:1149–1152
Stolper E (1980) A phase diagram for mid-ocean ridge basalts: preliminary results and implications for petrogenesis. Contrib Miner Petrol 74:13–27
Toramaru A, Fujii N (1986) Connectivity of melt phase in a partially molten peridotite. J Geophys Res 91:9239–9259
Waff HS, Bulau JR (1979) Equilibrium fluid distribution in an ultramafic partial melt under hydrostatic conditions. J Geophys Res 84:6109–6114
Waff HS, Bulau JR (1982) Experimental determination of near-equilibrium textures in partially molten silicates at high pressures. In: Akimoto S, Manghnani MH (eds) High pressure research in geophysics. Adv Earth Planet Sci 12, Center for Academic Publication, Tokyo, pp 229–236
Waff HS, Faul UH (1992) Effects of crystalline anisotropy on fluid distribution in ultramafic partial melts. J Geophys Res 97:9003–9014
Walker D, Jurewicz S, Watson EB (1988) Adcumulus dunite growth in a laboratory thermal gradient. Contrib Miner Petrol 99:306–319
Wark DA, Williams CA, Watson EB, Price JD (2003) Reassessment of pore shapes in microstructurally equilibrated rocks, with implications for permeability of the upper mantle. J Geophys Res (in press)
Watson EB (1982) Melt infiltration and magma evolution. Geology 10:236–240
Yaxley GM, Kamenetsky V, Green DH, Falloon TJ (1997) Glasses in mantle xenoliths from western Victoria, Autralia, and their relevance to mantle processes. Earth Planet Sci Lett 148:433–446
Zinngrebe E, Foley SF (1995) Metasomatism in mantle xenoliths from Gees, West Eifel, Germany: evidence for the genesis of calc-alkaline glasses and metasomatic Ca-enrichment. Contrib Miner Petrol 122:79–96
Acknowledgements
We thank Ariel Provost for his mass-balance program, Jean-Luc Devidal, Michelle Veschambre, François Faure, and Bertrand Devouard for technical help and advice, and Tahar Hammouda for helpful comments. Olgeir Sigmarsson provided the basalt from Lanzarote. This manuscript was improved by the constructive reviews of Bruce Watson and an anonymous reviewer. The authors acknowledge the financial support provided by INSU-CNRS. Work supported in part by the European Community’s Human Potential Program under contract HPRN-CT-2002-00211, (Euromelt). Contribution INSU-CNRS no. 363.
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Maumus, J., Laporte, D. & Schiano, P. Dihedral angle measurements and infiltration property of SiO2-rich melts in mantle peridotite assemblages. Contrib Mineral Petrol 148, 1–12 (2004). https://doi.org/10.1007/s00410-004-0595-x
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DOI: https://doi.org/10.1007/s00410-004-0595-x