Abstract:
:The Earth's mantle is isotopically heterogeneous on length scales ranging from centimetres to more than 10(4) kilometres. This heterogeneity originates from partial melt extraction and plate tectonic recycling, whereas stirring during mantle convection tends to reduce it. Here we show that mid-ocean ridge basalts from 2,000 km along the southeast Indian ridge (SEIR) display a bimodal hafnium isotopic distribution. This bimodality reveals the presence of ancient compositional striations (streaks) in the Indian Ocean upper mantle. The number density of the streaks is described by a Poisson distribution, with an average thickness of approximately 40 km. Such a distribution is anticipated for a well-stirred upper mantle, in which heterogeneity is continually introduced by plate tectonic recycling, and redistributed by viscous stretching and convective refolding.
journal_name
Naturejournal_title
Natureauthors
Graham DW,Blichert-Toft J,Russo CJ,Rubin KH,Albarède Fdoi
10.1038/nature04582keywords:
subject
Has Abstractpub_date
2006-03-09 00:00:00pages
199-202issue
7081eissn
0028-0836issn
1476-4687pii
nature04582journal_volume
440pub_type
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