Melting of a subducting oceanic crust from U-Th disequilibria in austral Andean lavas

Nature

Volumn 394, Issue 6693, 1998, Pages 566-569

  Sigmarsson, O ^a,b   Martin, H ^a   Knowles, J ^a  

^a CNRS   (France)

^b UNIVERSITY OF CALIFORNIA   (United States)

Author keywords

[No Author keywords available]

Indexed keywords

CRUSTAL EVOLUTION; MAGMA; OCEANIC CRUST; SUBDUCTION ZONE;

ARTICLE; CELL DIFFERENTIATION; GEOLOGY; ISOTOPE LABELING; OCEANIC REGIONS; PRIORITY JOURNAL; SOUTH AMERICA; STRUCTURE ANALYSIS; VOLCANO;

EID: 0032490997     PISSN: 00280836     EISSN: None     Source Type: Journal    
DOI: 10.1038/29052     Document Type: Article

References (29)

1. Gill, J. B. Organic Andesites and Plate Tectonics (Springer, New York, 1981).
2. McDermott, F. & Hawkesworth, C. Th, Pb and Sr isotope variations in young island arc volcanics and oceanic sediments. Earth Planet. Sci. Lett. 104, 1-15 (1991).
3. 230Th radioactive equilibrium? Geochim. Cosmochim. Acta 57, 4491-4497 (1993).
4. Defant, M. J. & Drummond, M. S. Derivation of some modern arc magmas by melting of young subducted lithosphere. Nature 347, 662-665 (1990).
5. Klein, E. M. & Karsten, J. L. Ocean-ridge basalts with convergent-margin geochemical affinities from the Chile Ridge. Nature 374, 52-57 (1995).
6. Martin, H. in The Archean Crustal Evolution (ed. Condie, K. C.) 205-259 (Elsevier, Amsterdam, 1995).
7. Allegre, C. J. & Condomines, M. Basalt genesis and mantle structure studied through Th isotope geochemistry. Nature 299, 21-24 (1982).
8. Cande, S. C. & Leslie, R. B. Late Cenozoic tectonics of the Southern Chile trench. J. Geophys. Res. 91, 471-496 (1986).
9. Forsythe, R. D. et al. Pilocene near-trench magmatism in southern Chile: a possible manifestation of ridge collision. Geology 14, 23-27 (1986).
10. Lagabrielle, Y., Le Moigne, J., Maury, R. C., Cotten, J. & Bourgois, J. Volcanic record of the subduction of an active spreading ridge: Taitao Peninsula (southern Chile). Geology 22, 515-518 (1994).
11. Bourgois, J., Martin, H., Lagabrielle, Y., Le Moigne, J. & Frutos-Jara, J. Subduction erosion related to spreading-ridge subduction: Taitao Peninsula (Chile margin triple junction area). Geology 24, 723-726 (1996).
12. Forsyth, D. W. Fault plane solution and tectonics of the South Atlantic and Scotia Sea. J. Geophys. Res. 80, 1429-1443 (1975).
13. Stern, C. R. & Kilian, R. Role of the subducted slab, mantle wedge and continental crust in the generation of adakites from the Andean Austral Volcanic Zone. Contrib. Mineral. Petrol. 123, 263-281 (1996).
14. Hildreth, W. & Moorbath, S. Crustal contribution to arc magmatism in the Andes of Central Chile. Contrib. Mineral. Petrol. 98, 455-489 (1988).
15. Stern, C. R., Futa, K. & Muehlenbachs, K. in Andean Magmatism: Chemical and Isotopic Constraints (eds Harmon, R. S. & Barreiro, B.) 31-46 (Shiva, Cheshire, 1984).
16. Martin, H. Archaean and modern granitoids as indicators of changes in geodynamic processes. Rev. Bras. Geocienc. 17, 360-365 (1987).
17. Sigmarsson, O, Condomines, M. & Fourcade, S. A detailed Th, Sr and O isotope study of Hekla: differentiation processes in an Icelandic volcano. Contrib. Mineral. Petrol. 112, 20-34 (1992).
18. 10Be enrichments by fluids in Andean arc magmas. Nature 346, 163-165 (1990).
19. Peacock, S. M., Rushmer, T. & Thompson, A. B. Partial melting of subducted oceanic crust. Earth Planet. Sci. Lett. 121, 227-244 (1994).
20. Rapp, R. P. & Watson, E. B. Dehydration melting of metabasalt at 8-32 kbar: implications for continental growth and crust-mantle recycling. J. Petrol. 36, 891-931 (1995).
21. Schiano, P. et al. Hydrous, silica-rich melts in the sub-arc mantle and their relationship with erupted arc lavas. Nature 377, 595-600 (1995).
22. Beattie, P. Uranium-thorium disequilibria and partitioning on melting garnet peridotite. Nature 363, 63-65 (1993).
23. LaTourette, T. K., Kennedy, A. K. & Wasserburg, G. J. Thorium-uranium fractionation by garnet: evidence for a deep source and rapid rise of oceanic basalts. Science 261, 739-742 (1993).
24. Johnson, K. T. M. Experimental cpx/ and garnet/melt partitioning of REE and other trace elements at high pressures: petrogenetic implications. Mineral. Mag. A 58, 454-455 (1994).
25. Tribuzio, R., Messiga, B., Vannucci, R. & Bottazzi, P. Rare earth element redistribution during high-pressure-low-temperature metamorphism in ophiolotic Fe-gabbros (Liguria, northwestern Italy): implications for light REE mobility in subduction zone. Geology 24, 711-714 (1996).
26. Mezger, K., Hanson, G. N. & Bohlen, S. R. High-precision U-Pb ages of metamorphic rutile: application to the cooling history of high-grade terranes. Earth Planet. Sci. Lett. 96, 106-118 (1989).
27. Brenan, I. M., Shaw, H. F., Phinney, D. L. & Ryerson, F. I. Rutile-aqueous fluid partitioning of Nb, Ta, Hf, Zr, U and Th: implications for high field strength element depletions in island-arc basalts. Earth Planet. Sci. Lett. 128, 327-339 (1994).
28. Kelemen, P. M. Genesis of high Mg# andesites and the continental crust. Contrib. Mineral. Petrol. 120, 1-19 (1995).
29. Leeman, W. P., Smith, D. R., Hildreth, W., Palacz, Z. & Rogers, N. Compositional diversity of late Cenozoic basalts in a transect across the southern Washington Cascades: implications for subduction zone magmatism. J. Geophys. Res. 95, 19561-19582 (1990).