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dc.contributor.author
Giuliani, Andrea
dc.contributor.author
Jackson, Matthew G.
dc.contributor.author
Fitzpayne, Angus
dc.contributor.author
Dalton, Hayden
dc.date.accessioned
2021-02-18T12:33:01Z
dc.date.available
2021-02-06T03:41:38Z
dc.date.available
2021-02-18T12:33:01Z
dc.date.issued
2021-01-05
dc.identifier.issn
0027-8424
dc.identifier.issn
1091-6490
dc.identifier.other
10.1073/pnas.2015211118
en_US
dc.identifier.uri
http://hdl.handle.net/20.500.11850/468143
dc.description.abstract
The noble gas isotope systematics of ocean island basalts suggest the existence of primordial mantle signatures in the deep mantle. Yet, the isotopic compositions of lithophile elements (Sr, Nd, Hf) in these lavas require derivation from a mantle source that is geochemically depleted by melt extraction rather than primitive. Here, this apparent contradiction is resolved by employing a compilation of the Sr, Nd, and Hf isotope composition of kimberlites-volcanic rocks that originate at great depth beneath continents. This compilation includes kimberlites as old as 2.06 billion years and shows that kimberlites do not derive from a primitive mantle source but sample the same geochemically depleted component (where geochemical depletion refers to ancient melt extraction) common to most oceanic island basalts, previously called PREMA (prevalent mantle) or FOZO (focal zone). Extrapolation of the Nd and Hf isotopic compositions of the kimberlite source to the age of Earth formation yields a Nd-143/Nd-144-1( 176)Hf/Hf-1(77) composition within error of chondrite meteorites, which include the likely parent bodies of Earth. This supports a hypothesis where the source of kimberlites and ocean island basalts contains a long-lived component that formed by melt extraction from a domain with chondritic Nd-143/Nd-144 and Hf-176/Hf-177 shortly after Earth accretion. The geographic distribution of kimberlites containing the PREMA component suggests that these remnants of early Earth differentiation are located in large seismically anomalous regions corresponding to thermochemical piles above the core-mantle boundary. PREMA could have been stored in these structures for most of Earth's history, partially shielded from convective homogenization.
en_US
dc.language.iso
en
en_US
dc.publisher
National Academy of Sciences
en_US
dc.subject
mantle evolution
en_US
dc.subject
early Earth
en_US
dc.subject
kimberlite
en_US
dc.subject
ocean island basalt
en_US
dc.subject
LLSVP
en_US
dc.title
Remnants of early Earth differentiation in the deepest mantle-derived lavas
en_US
dc.type
Journal Article
ethz.journal.title
Proceedings of the National Academy of Sciences of the United States of America
ethz.journal.volume
118
en_US
ethz.journal.issue
1
en_US
ethz.journal.abbreviated
Proc Natl Acad Sci U S A
ethz.pages.start
e2015211118
en_US
ethz.size
9 p.
en_US
ethz.grant
A new understanding of kimberlite magmas from deep Earth to diamond mines
en_US
ethz.identifier.wos
ethz.publication.place
Washington, DC
en_US
ethz.publication.status
published
en_US
ethz.leitzahl
ETH Zürich::00002 - ETH Zürich::00012 - Lehre und Forschung::00007 - Departemente::02330 - Dep. Erdwissenschaften / Dep. of Earth Sciences::02725 - Institut für Geochemie und Petrologie / Institute of Geochemistry and Petrology::03592 - Schmidt, Max / Schmidt, Max
ethz.leitzahl
ETH Zürich::00002 - ETH Zürich::00012 - Lehre und Forschung::00007 - Departemente::02330 - Dep. Erdwissenschaften / Dep. of Earth Sciences::02725 - Institut für Geochemie und Petrologie / Institute of Geochemistry and Petrology::03592 - Schmidt, Max / Schmidt, Max
ethz.leitzahl.certified
ETH Zürich::00002 - ETH Zürich::00012 - Lehre und Forschung::00007 - Departemente::02330 - Dep. Erdwissenschaften / Dep. of Earth Sciences::02725 - Institut für Geochemie und Petrologie / Institute of Geochemistry and Petrology::03592 - Schmidt, Max / Schmidt, Max
ethz.grant.agreementno
180126
ethz.grant.fundername
SNF
ethz.grant.funderDoi
10.13039/501100001711
ethz.grant.program
Ambizione
ethz.date.deposited
2021-02-06T03:41:49Z
ethz.source
WOS
ethz.eth
yes
en_US
ethz.availability
Metadata only
en_US
ethz.rosetta.installDate
2021-02-18T12:33:13Z
ethz.rosetta.lastUpdated
2022-03-29T05:16:57Z
ethz.rosetta.versionExported
true
ethz.COinS
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