Linked Life Data

16525470

Source:http://linkedlifedata.com/resource/pubmed/id/16525470

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
7081
pubmed:dateCreated
2006-3-9
pubmed:abstractText
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.
pubmed:language
eng
pubmed:journal
pubmed:status
PubMed-not-MEDLINE
pubmed:month
Mar
pubmed:issn
1476-4687
pubmed:author
pubmed:issnType
Electronic
pubmed:day
9
pubmed:volume
440
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
199-202
pubmed:year
2006
pubmed:articleTitle
Cryptic striations in the upper mantle revealed by hafnium isotopes in southeast Indian ridge basalts.
pubmed:affiliation
College of Oceanic and Atmospheric Sciences, Oregon State University, Corvallis, Oregon 97331, USA. dgraham@coas.oregonstate.edu
pubmed:publicationType
Journal Article