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Cryptic striations in the upper mantle revealed by hafnium isotopes in southeast Indian ridge basalts
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Cryptic striations in the upper mantle revealed by hafnium isotopes in southeast Indian ridge basalts
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Journal Article
Cryptic striations in the upper mantle revealed by hafnium isotopes in southeast Indian ridge basalts
2006
Overview
The Earth's mantle is isotopically heterogeneous on length scales ranging from centimetres to more than 10
4
kilometres
1
,
2
. 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 ∼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.
Publisher
Nature Publishing Group UK,Nature Publishing,Nature Publishing Group
