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Volumn 305, Issue 5686, 2004, Pages 991-994

Probing the accumulation history of the voluminous Toba magma

Author keywords

[No Author keywords available]

Indexed keywords

CRYSTALS; MELTING;

EID: 4043174259     PISSN: 00368075     EISSN: None     Source Type: Journal    
DOI: 10.1126/science.1096994     Document Type: Article
Times cited : (127)

References (45)
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    • Iyer, H.M.1
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    • note
    • Materials and analytical methods are available as supporting material on Science Online.
  • 17
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    • note
    • 232Th activity ratio variations of the YTT (0.358 to 0.433) are representative of the initial range of Th-isotope composition. For reported ages < 120 ka, the uncertainty in age associated with the initial ratio is within the analytical uncertainty on the ages, except for the youngest attanite domains which could not have grown from melts that had Th isotope compositions significantly different from that of their host. Reported ages that are 120 to 200 ka could be at most a few percent to, for the older of these, as much as 27% older than allowed by the analytical uncertainty. Those few allanites with ages >200 ka could be substantially older. Thus, the age ranges reported here are conservative.
  • 18
    • 4043127172 scopus 로고    scopus 로고
    • J. M. Hanchar, P. W. O. Hoskin, Eds. (Mineralogical Society of America, Washington, DC), chap. 3
    • J. B. Thomas, R. J. Bodnar, N. Shimizu, C. Chesner, in Zircon, J. M. Hanchar, P. W. O. Hoskin, Eds. (Mineralogical Society of America, Washington, DC, 2004), vol. 53, chap. 3.
    • (2004) Zircon , vol.53
    • Thomas, J.B.1    Bodnar, R.J.2    Shimizu, N.3    Chesner, C.4
  • 20
    • 4043063280 scopus 로고    scopus 로고
    • note
    • MnO/MgO in residual melts of silicic magmas typically increases with fractionation of major mafic silicates. La/Nd also increases except when the fractionating assemblage includes sufficient quantities of allanite, chevkinite, and/or monazite that are rich in light rare earth elements (37).
  • 21
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    • H. D. Holland, K. K. Turekian, Eds. (Elsevier, Amsterdam), chap. 3.05
    • M. R. Reid, in Treatise on Geochemistry, H. D. Holland, K. K. Turekian, Eds. (Elsevier, Amsterdam, 2003), vol. 3, chap. 3.05.
    • (2003) Treatise on Geochemistry , vol.3
    • Reid, M.R.1
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    • B. Bourdon, G. M. Henderson, C. C. Lundstrom, S. P. Turner, Eds. (Mineralogical Society of America, Washington, DC), chap. 4
    • M. Condomines, P.-J. Gauthier, O. Sigmarsson, in Uranium-Series Geochemistry, B. Bourdon, G. M. Henderson, C. C. Lundstrom, S. P. Turner, Eds. (Mineralogical Society of America, Washington, DC, 2003), vol. 52, chap. 4.
    • (2003) Uranium-Series Geochemistry , vol.52
    • Condomines, M.1    Gauthier, P.-J.2    Sigmarsson, O.3
  • 45
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    • note
    • We are grateful to C. Chesner for samples; C. Coath, F. Ramos, and F. Kyte for analytical help; and especially J. Simon and G. Bergantz for insightful discussions. Anonymous referees provided very helpful reviews. Funded by NSF grants EAR-9706519 and EAR-0003601. The University of California, Los Angeles (UCLA), ion microprobe is partially subsidized by a grant from the NSF Instrumentations and Facilities Program


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