The mass of continental crust has not changed significantly since the early Archean

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ss of continental crust has not ch ignificantly since the early Archea

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The mass of continental crust has not changed significantly since the early Archean. The mass of continental crust has not changed significantly since the early Archean. Proto-Archean. Formation of continental crust. Differenciation of primitive mantle. Enriched continental crust. - PowerPoint PPT Presentation

Transcript of The mass of continental crust has not changed significantly since the early Archean

Page 1: The mass of continental crust has not changed significantly since the early Archean

The mass of continental crust has not changed significantly since the early Archean

Page 2: The mass of continental crust has not changed significantly since the early Archean
Page 3: The mass of continental crust has not changed significantly since the early Archean
Page 4: The mass of continental crust has not changed significantly since the early Archean
Page 5: The mass of continental crust has not changed significantly since the early Archean

The mass of continental crust has not changed significantly since the early Archean

Page 6: The mass of continental crust has not changed significantly since the early Archean

Undifferenciatedprimitive mantle

Enriched continental crust

Depleted mantle

Formation of continental crust

Differenciation of primitive mantle

Formation of the bulk of the continental crust in the Proto-Archean

Proto-Archean depleted mantle

Proto-Archean

Page 7: The mass of continental crust has not changed significantly since the early Archean

Nb/U

Both incompatible elements

U more incompatible than Nb

Differenciation higher Nb/U in continental crustlower Nb/U in depleted mantle

Nb/U ~30

Nb/U ~47

Nb/U ~10

Modern MORB

Continental crust

Primitive mantle

Archean basalts Nb/U ~ 30 - 47

Geochemical evidence

Page 8: The mass of continental crust has not changed significantly since the early Archean

Sylvester et al. (1997)

Late Archean basalts

Lunnon FormationYilgarn Craton

Depleted mantle source

Amount of continental crust extracted is the same as today

Crustal contamination curve

Page 9: The mass of continental crust has not changed significantly since the early Archean

3.5 Ga basalts and komatiites

Barberton Montain Land, South Africa

Campbell (2003)

Average Nb/U : 43

Suggest an early depleted mantle and and amount of continental crust extracted similar as today

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3.5 Ga Basalts from Pilbara Craton

Sylvester ()

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Isua 3.8 Ga

Porpoise Cove 3.8 Ga

Depleted mantle at 3.8 Ga

?Isotopic evidence

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Recycling

McCulloch and Bennett (1994)


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