Consistent olivine Mg# in cratonic mantle reflects Archean mantle melting to the exhaustion of orthopyroxene

Stefan Bernstein, Peter B. Kelemen, Karen Hanghøj

Publikation: Bidrag til tidsskriftArtikelForskningpeer review

128 Citationer (Scopus)

Abstrakt

Shallow (garnet-free), depleted cratonic mantle, occurring as xenoliths in kimberlites and alkaline basaltic lavas, has a high Mg# (100 × Mg/(Mg + Fe) > 92) and is poor in Al and Ca compared to off-cratonic mantle. Here we compile data for many suites of shallow cratonic: mantle xenoliths worldwide, and demonstrate a remarkably small range in their olivine Mg#, with an average of ∼92.8. Via comparison with data for experimental melting of mantle peridotite compositions, we explain consistent olivine Mg# as the result of mantle melting and melt extraction to the point of orthopyroxene exhaustion, leaving a nearly monomineralic olivine residue.

OriginalsprogEngelsk
Sider (fra-til)459-462
Antal sider4
TidsskriftGeology
Vol/bind35
Udgave nummer5
DOI
StatusUdgivet - maj 2007

Programområde

  • Programområde 4: Mineralske råstoffer

Fingeraftryk

Dyk ned i forskningsemnerne om 'Consistent olivine Mg# in cratonic mantle reflects Archean mantle melting to the exhaustion of orthopyroxene'. Sammen danner de et unikt fingeraftryk.

Citationsformater