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Combined dynamic and geochemical evidence for convergent melt flow beneath the East Pacific Rise

Nature volume 402, pages 282–285 (1999)Cite this article

Abstract

Determining the flow of magma and solid mantle beneath mid-ocean ridges is crucial for understanding the dynamics of plate spreading and the formation of new oceanic crust. Theoretical models suggest a range of possible flow regimes—from passive, plate-driven flows1,2 to ‘active’, buoyantly driven solid convection3,4,5,6,7—and have spurred an ambitious field programme to attempt to distinguish these flow fields using geophysical techniques8. Models that explore the geochemical consequences of melt transport9, however, suggest that these different flow fields can also have distinctive geochemical signatures. Here we compare model predictions to the chemistry of well located and closely sampled basalts from across the ridge-crest of the fast-spreading East Pacific Rise at 12° N (refs 10,11,12). These data show features that are not explained by traditional geochemical models of ocean-ridge magma generation, yet are consistent with the geochemical consequences of the new transport models that have passive mantle flow and convergent lateral melt migration. These results are also consistent with those of the seismic MELT experiment8, but add new information about the relative flow of melt and solid in the mantle which is probably unmeasurable by geophysical techniques.

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Figure 1: Two-dimensional calculations of melt and solid mantle flow beneath mid-ocean ridges for two end-member flow regimes.
Figure 2: The geochemical signatures of the two flow models shown in Fig. 1.
Figure 3: Map showing the location and composition of samples collected between 12° 00′ and 12° 30′ N on the East Pacific Rise10,11,12.
Figure 4: Comparison of on- and off-axis EPR magmas with model predictions.

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References

  1. Spiegelman,M. & McKenzie,D. Simple 2-D models for melt extraction at mid-ocean ridges and island arcs. Earth Planet. Sci. Lett. 83, 137–152 (1987).

    Article  ADS  Google Scholar 

  2. Phipps Morgan,J. Melt migration beneath mid-ocean spreading centers. Geophys. Res. Lett. 14, 1238–1241 (1987).

    Article  ADS  Google Scholar 

  3. Scott,D. R. & Stevenson,D. J. A self-consistent model of melting, magma migration and buoyancy-driven circulation beneath mid-ocean ridges. J. Geophys. Res. 94, 2973–2988 (1989).

    Article  ADS  Google Scholar 

  4. Buck,W. R. & Su,W. Focused mantle upwelling below mid-ocean ridges due to feedback between viscosity and melting. Geophys. Res. Lett. 16, 641–644 (1989).

    Article  ADS  Google Scholar 

  5. Scott,D. R. in Mantle Flow and Melt Generation at Mid-ocean Ridges (eds Phipps Morgan, J., Blackman, D. K. & Sinton, J. M.) 327–352 (Geophysical Monogr. Vol. 71, American Geophysical Union, Washington DC, 1992).

    Google Scholar 

  6. Cordery,M. J. & Phipps Morgan,J. Convection and melting at mid-ocean ridges. J. Geophys. Res. 98, 19477–19503 (1993).

    Article  ADS  CAS  Google Scholar 

  7. Sparks,D. W. & Parmentier,E. M. The structure of three-dimensional convection beneath oceanic spreading centres. Geophys. J. Int. 112, 81–91 (1993).

    Article  ADS  Google Scholar 

  8. Forsyth,D. W. et al. Imaging the deep seismic structure beneath a mid-ocean ridge: the MELT experiment. Science 280, 1215–1217 (1998).

    Article  ADS  Google Scholar 

  9. Spiegelman,M. Geochemical consequences of melt transport in 2-D: The sensitivity of trace elements to mantle dynamics. Earth Planet. Sci. Lett. 139, 115–132 (1996).

    Article  ADS  CAS  Google Scholar 

  10. Reynolds,J. R., Langmuir,C. H., Bender,J. F., Kastens,K. A. & Ryan,W. B. F. Spatial and temporal variability in the geochemistry of basalts from the East Pacific Rise. Nature 359, 493–499 (1992).

    Article  ADS  CAS  Google Scholar 

  11. Reynolds,J. R. Segment Scale Systematics of Mid-ocean Ridge Magmatism and Geochemistry. (Thesis, Columbia Univ./LDEO, (1995).

    Google Scholar 

  12. Reynolds,J. R. & Langmuir,C. H. Identification and implications of off-axis lava flows around the East Pacific Rise. Earth Planet. Sci. Lett. (in the press).

  13. Plank,T. & Langmuir,C. H. Effects of the melting regime on the composition of the oceanic crust. J. Geophys. Res. 97, 19749–19770 (1992).

    Article  ADS  Google Scholar 

  14. McKenzie,D. & O'Nions,R. K. Partial melt distributions from inversion of rare earth element concentrations. J. Petrol. 32, 1021–1091 (1991).

    Article  ADS  CAS  Google Scholar 

  15. Monti,S., Gente,P. & Maze,J. P. Carte Batheymetrique de la Dorsale Est-Pacifique de 10° Nord a 14°30′ Nord (IFREMER, Brest, 1987).

    Google Scholar 

  16. Crane,K. Structural evolution of the East Pacific Rise axis from 13° 10′N to 10° 35′N; interpretation from Sea-MARC I data. Tectonophysics 136, 65–124 (1987).

    Article  ADS  Google Scholar 

  17. Perfit,M. R. & Chadwick,W. W. Jr in Faulting and Magmatism at Mid-Ocean Ridges (eds Buck, R. W., Delaney, P. T., Karson, J. A. & Lagabrielle, Y.) 59–115 (Geophysical Monogr. Ser., Vol. 106, American Geophysical Union, Washington DC, 1998).

    Google Scholar 

  18. Detrick,R. S. et al. Multi-channel seismic imaging of a crustal magma chamber along the East Pacific Rise. Nature 326, 35–41 (1987).

    Article  ADS  Google Scholar 

  19. Perfit,M. R. et al. Small-scale spatial and temporal variations in midocean ridge crest magmatic processes. Geology 22, 375–397 (1994).

    Article  ADS  CAS  Google Scholar 

  20. Perfit,M. R. et al. Detailed petrological and geochemical studies of on- and off-axis lavas from the East Pacific Rise; 9°30′–10°N. Eos 75, 601 (1994).

    Google Scholar 

  21. Weaver,J. S. & Langmuir,C. H. Calculation of phase equilibrium in mineral-melt systems. Comput. Geosci. 16, 1–19 (1990).

    Article  ADS  Google Scholar 

  22. Goldstein,S. J., Perfit,M. R., Batiza,R., Fornari,D. J. & Murell,M. T. Off-axis volcanism at the East Pacific Rise detected by uranium-series dating of basalts. Nature 367, 157–159 (1994).

    Article  ADS  CAS  Google Scholar 

  23. Sparks,D. W. & Parmentier,E. M. Melt extraction from the mantle beneath spreading centers. Earth Planet. Sci. Lett. 105, 368–377 (1991).

    Article  ADS  Google Scholar 

  24. Spiegelman,M. Physics of melt extraction: Theory, implications and applications. Phil. Trans. R. Soc. Lond. A 342, 23–41 (1993).

    Article  ADS  Google Scholar 

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Acknowledgements

We thank M. Perfit for comments and suggestions, and C. H. Langmuir and P. Asimow for discussions. This work was supported by NSF-OCE.

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  1. Jennifer R. Reynolds

    Present address: Monterey Bay Aquarium Research Institute, PO Box 628, 7700 Sandholt Rd, Moss Landing, California, 95039, USA

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  1. Lamont-Doherty Earth Observatory, Palisades, 10964, New York, USA

    Marc Spiegelman & Jennifer R. Reynolds

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Correspondence to Marc Spiegelman.

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Spiegelman, M., Reynolds, J. Combined dynamic and geochemical evidence for convergent melt flow beneath the East Pacific Rise. Nature 402, 282–285 (1999). https://doi.org/10.1038/46260

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