Archaean and Proterozoic diamond growth from contrasting styles of large-scale magmatism

Janne M. Koornneef, Michael U. Gress, Ingrid L. Chinn, Hielke A. Jelsma, Jeff W. Harris, Gareth R. Davies

Research output: Contribution to JournalArticleAcademicpeer-review

Abstract

Precise dating of diamond growth is required to understand the interior workings of the early Earth and the deep carbon cycle. Here we report Sm-Nd isotope data from 26 individual garnet inclusions from 26 harzburgitic diamonds from Venetia, South Africa. Garnet inclusions and host diamonds comprise two compositional suites formed under markedly different conditions and define two isochrons, one Archaean (2.95 Ga) and one Proterozoic (1.15 Ga). The Archaean diamond suite formed from relatively cool fluid-dominated metasomatism during rifting of the southern shelf of the Zimbabwe Craton. The 1.8 billion years younger Proterozoic diamond suite formed by melt-dominated metasomatism related to the 1.1 Ga Umkondo Large Igneous Province. The results demonstrate that resolving the time of diamond growth events requires dating of individual inclusions, and that there was a major change in the magmatic processes responsible for harzburgitic diamond formation beneath Venetia from the Archaean to the Proterozoic.

Original languageEnglish
Article number648
JournalNature Communications
Volume8
Issue number1
DOIs
Publication statusPublished - 1 Dec 2017

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Diamond
diamonds
Growth
Garnets
inclusions
dating
garnets
Zimbabwe
carbon cycle
Carbon Cycle
Republic of South Africa
cratons
South Africa
shelves
Isotopes
Carbon
isotopes
Earth (planet)
Fluids
fluids

Cite this

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abstract = "Precise dating of diamond growth is required to understand the interior workings of the early Earth and the deep carbon cycle. Here we report Sm-Nd isotope data from 26 individual garnet inclusions from 26 harzburgitic diamonds from Venetia, South Africa. Garnet inclusions and host diamonds comprise two compositional suites formed under markedly different conditions and define two isochrons, one Archaean (2.95 Ga) and one Proterozoic (1.15 Ga). The Archaean diamond suite formed from relatively cool fluid-dominated metasomatism during rifting of the southern shelf of the Zimbabwe Craton. The 1.8 billion years younger Proterozoic diamond suite formed by melt-dominated metasomatism related to the 1.1 Ga Umkondo Large Igneous Province. The results demonstrate that resolving the time of diamond growth events requires dating of individual inclusions, and that there was a major change in the magmatic processes responsible for harzburgitic diamond formation beneath Venetia from the Archaean to the Proterozoic.",
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Archaean and Proterozoic diamond growth from contrasting styles of large-scale magmatism. / Koornneef, Janne M.; Gress, Michael U.; Chinn, Ingrid L.; Jelsma, Hielke A.; Harris, Jeff W.; Davies, Gareth R.

In: Nature Communications, Vol. 8, No. 1, 648, 01.12.2017.

Research output: Contribution to JournalArticleAcademicpeer-review

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