Cryptic striations in the upper mantle revealed by hafnium isotopes in southeast Indian ridge basalts.

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

Nature

journal_title

Nature

authors

Graham DW,Blichert-Toft J,Russo CJ,Rubin KH,Albarède F

doi

10.1038/nature04582

keywords:

subject

Has Abstract

pub_date

2006-03-09 00:00:00

pages

199-202

issue

7081

eissn

0028-0836

issn

1476-4687

pii

nature04582

journal_volume

440

pub_type

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