A New Model for Barberton Komatiites: Deep Critical Melting with High Melt Retention

Robin-Popieul, Christophe C. M.; Arndt, Nicholas; Chauvel, Catherine; Byerly, Gary R.; Sobolev, Alexander V.; Wilson, A. H.

doi:10.1093/petrology/egs042

Cited by 130 publications

(75 citation statements)

References 90 publications

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“…In Korenaga (2009b), the dehydration-stiffening is based on the assumption that Fig. 5 Comparison of the major element compositions of the 1, 3, and 7 GPa near-solidus melts (Falloon et al 2008;Davis et al 2011; this study) with the 3.3-3.5 Ga Barberton komatiites (Robin-Popieul et al 2012), 2.7 Ga Abitibi komatiites (Kerrich and Xie 2002), and 3.8 Ga Isua MORB and OIB (Komiya et al 2004). MORB mid-ocean ridge basalt, OIB ocean island basalt asthenospheric olivine contains <1000 ppm H/Si.…”

Section: A Scenario For the Formation Of The Eer In The Hadeanmentioning

confidence: 99%

Major element composition of an Early Enriched Reservoir: constraints from 142Nd/144Nd isotope systematics in the early Earth and high-pressure melting experiments of a primitive peridotite

Kondo

Yoshino

Matsukage

et al. 2016

Prog. in Earth and Planet. Sci.

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The Accessible Silicate Earth (ASE) has a higher 142 Nd reservoir is believed to have been derived from a melt in the early Earth and is called the Early Enriched Reservoir (EER). Although the major element composition of the EER is crucial for estimating its chemical and physical properties (e.g., density) and is also essential for understanding the origin and fate of the EER, which are both major factors that determine the present composition of the Earth, it has not yet been robustly established. In order to determine the major element composition of the EER, we estimated the age and pressuretemperature conditions to form the EER that would best explain its Nd isotopic characteristics, based on Sm-Nd partitioning and its dependence on pressure, temperature, and melting phase relations. Our estimate indicates that the EER formed within 33.5 Myr of Solar System formation and at near-solidus temperatures and shallow uppermantle pressures. We then performed high-pressure melting experiments on primitive peridotite to determine the major element composition of the EER at estimated temperature at 7 GPa and calculated the density of the EER. The result of our experiments indicates that the near-solidus melt is iron-rich komatiite. The estimated density of the near-solidus melt is lower than that of the primitive peridotite, suggesting that the EER melt would have ascended in the mantle to form an early crust. Given that high mantle potential temperatures are assumed to have existed in the Hadean, it follows that the EER melt was generated at high pressure and, therefore, its composition would have been picritic to komatiitic. As the formation age of the EER estimated in our study precedes the last giant, lunar-forming impact, the picritic to komatiitic crust (EER) would most likely have been ejected from the Earth by the last giant impact or preceding impacts. Thus, the EER has been lost, leaving the Earth more depleted than its original composition.

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Section: A Scenario For the Formation Of The Eer In The Hadeanmentioning

confidence: 99%

Major element composition of an Early Enriched Reservoir: constraints from 142Nd/144Nd isotope systematics in the early Earth and high-pressure melting experiments of a primitive peridotite

Kondo

Yoshino

Matsukage

et al. 2016

Prog. in Earth and Planet. Sci.

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“…Among the komatiite suites studies so far, the komatiites most similar to the Quebra Osso komatiites are the high-Al, low-Ti Commondale komatiites and the Weltevreden komatiites from the Barberton Greenstone Belt (Lowe and Byerly, 1999;Connolly et al, 2011;Robin-Popieul et al, 2012;Puchtel et al, 2013). The Quebra Osso komatiites show the same high Al 2 O 3 /TiO 2 , low CaO/Al 2 O 3 , strong depletion in LREE and low Re/Os as the Commondale komatiites, but have even higher MgO, slightly lower SiO 2 , and higher Fe 2 O 3 content .…”

Section: Comparison To Other Komatiite Suitesmentioning

confidence: 99%

“…In contrast, the Weltevreden komatiites were suggested to be the result from anhydrous melting, based on their low H 2 O/Ce ratios (Connolly et al, 2011). A different model for Al-depleted, Al-undepleted, and Al-enriched komatiites was suggested by Robin-Popieul et al (2012), who suggested multi-stage melting at varying pressure for komatiites from the Komati, Hooggenoeg and Weltevreden Formations based on major and lithophile trace elements. In this model, garnet is a stable phase throughout the first stage of small-degree partial melting which produces Al-depleted komatiites, while later stages of high-degree fractional melting occur in the absence of garnet at shallower depths, resulting in the production of Al-enriched komatiites.…”

Section: Comparison To Other Komatiite Suitesmentioning

confidence: 99%

“…GPa (Robin-Popieul et al, 2012), solubility of S in the komatiite melt would be around 250 ppm (Mavrogenes and O'Neill, 1999), leading to formation of S-saturated komatiite magma even at high degrees of melting around 40%. Assuming a pre-depleted mantle source containing 150 ppm S, sulfide exhaustion in the source is obtained upon ~40% of fractional partial melting.…”

Section: Accepted Manuscriptmentioning

confidence: 99%

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Formation of high-Al komatiites from the Mesoarchean Quebra Osso Group, Minas Gerais, Brazil: Trace elements, HSE systematics and Os isotopic signatures

et al. 2016

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“…Ambient mantle temperature in the Archean has been suggest to be ~1680 o C (Arndt, 1977;Campbell et al, 1989;Arndt and Nisbet, 2012;Puchtel et al, 2013;Leverington, 2014;Sossi et al, 2016) Robin-Popieul et al, 2012;Kröner et al, 2013;Puchtel et al, 2013;).…”

Section: Signaturementioning

confidence: 99%

Reconstruction of the physical volcanological processes and petrogenesis of the 3.5Ga Warrawoona Group pillow basalt of the Warralong Greenstone Belt, Pilbara Craton Western Australia

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A New Model for Barberton Komatiites: Deep Critical Melting with High Melt Retention

Cited by 130 publications

References 90 publications

Major element composition of an Early Enriched Reservoir: constraints from 142Nd/144Nd isotope systematics in the early Earth and high-pressure melting experiments of a primitive peridotite

Major element composition of an Early Enriched Reservoir: constraints from 142Nd/144Nd isotope systematics in the early Earth and high-pressure melting experiments of a primitive peridotite

Formation of high-Al komatiites from the Mesoarchean Quebra Osso Group, Minas Gerais, Brazil: Trace elements, HSE systematics and Os isotopic signatures

Reconstruction of the physical volcanological processes and petrogenesis of the 3.5Ga Warrawoona Group pillow basalt of the Warralong Greenstone Belt, Pilbara Craton Western Australia

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