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Mantle Plumes and Entrainment: Isotopic Evidence
Abstract
Many oceanic island basalts show sublinear subparallel arrays in Sr-Nd-Pb isotopic space. The depleted upper mantle is rarely a mixing end-member of these arrays, as would be expected if mantle plumes originated at a 670-kilometer boundary layer and entrained upper mantle during ascent. Instead, the arrays are fan-shaped and appear to converge on a volume in isotopic space characterized by low 87 Sr/ 86 Sr and high 143 Nd/ 144 Nd, 206 Pb/ 204 Pb, and 3 He/ 4 He ratios. This new isotopic component may be the lower mantle, entrained into plumes originating from the core-mantle boundary layer.
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Citations
Cited by
Mantle geochemistry: The message from oceanic volcanism
Hofmann, A. W. (1997) · Nature · doi:10.1038/385219a0 · Cited by 2,782
Large igneous provinces: Crustal structure, dimensions, and external consequences
Coffin, M. F., & Eldholm, O. (1994) · Reviews of Geophysics · doi:10.1029/93rg02508 · Cited by 1,544
Recycled dehydrated lithosphere observed in plume-influenced mid-ocean-ridge basalt
Dixon, J. E., Leist, L., Langmuir, C., & Schilling, J.-G. (2002) · Nature · doi:10.1038/nature01215 · Cited by 523
The Emeishan large igneous province: A synthesis
Shellnutt, J. G. (2014) · Geoscience Frontiers · doi:10.1016/j.gsf.2013.07.003 · Cited by 438
Ancient, highly heterogeneous mantle beneath Gakkel ridge, Arctic Ocean
Liu, C.-Z., Snow, J. E., Hellebrand, E., Brügmann, G., von der Handt, A., Büchl, A., & Hofmann, A. W. (2008) · Nature · doi:10.1038/nature06688 · Cited by 342
Metadata
- Authors
- Hart, S. R., Hauri, E. H., Oschmann, L. A., & Whitehead, J. A.
- Venue
- Science
- Published
- 1992-04-24
- Volume
- 256
- Issue
- 5056
- Pages
- 517-520
- ISSN
- 0036-8075 (ISSN-L)
- 1095-9203
- OpenAlex
- W2009544440
- Cited by
- 1,035
- References
- 0
- FWCI
- 15.47
- Type
- journal article
- Language
- en
- Open access
- closed
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- Hart, S. R., Hauri, E. H., Oschmann, L. A., & Whitehead, J. A. (1992). Mantle Plumes and Entrainment: Isotopic Evidence. Science. https://doi.org/10.1126/science.256.5056.517
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