Origin of HIMU and EM-1 domains sampled by ocean island basalts, kimberlites and carbonatites: The role of CO2-fluxed lower mantle melting in thermochemical upwellings

Collerson, K. D.; Williams, Quentin; Ewart, A.; Murphy, David T.

doi:10.1016/j.pepi.2010.05.008

Cited by 85 publications

(47 citation statements)

References 167 publications

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“…It has been supposed, on the basis of a series of petrologic and isotopic evidence, that carbonatite magmas may originate in the deepest parts of the mantle (Dalou et al 2009;Bell and Simonetti 2010;Collerson et al 2010) and be linked to the production of large igneous provinces (Ernst and Bell 2010). Our data on the existence of carbonatitic inclusions in lower-mantle diamond support these ideas.…”

Section: Carbon Diamond and Hotspotssupporting

confidence: 75%

A primary natrocarbonatitic association in the Deep Earth

2015

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In addition to ultramafic and mafic associations, a primary natrocarbonatitic association occurs in the lower mantle. To date, it was identified as inclusions in diamonds from the Juina area, Mato Grosso State, Brazil. It comprises almost 50 mineral species: carbonates, halides, fluorides, phosphates, sulfates, oxides, silicates, sulfides and native elements. In addition, volatiles are present in this association. Among oxides, coexisting periclase and wüstite were identified, pointing to the formation of the natrocarbonatitic association at a depth greater than 2,000 km. Some ironrich (Mg,Fe)O inclusions in diamond are attributed to the lowermost mantle. The initial lower-mantle carbonatitic melt formed as a result of low-fraction partial melting of carbon-containing lower-mantle material, rich in P, F, Cl and other volatile elements, at the core-mantle boundary. During ascent to the surface, the initial carbonatitic melt dissociated into two immiscible parts, a carbonate-silicate and a chloride-carbonate melt. The latter melt is parental to the natrocarbonatitic lower-mantle association. Diamonds with carbonatitic inclusions were formed in carbonatitic melts or high-density fluids.

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Section: Carbon Diamond and Hotspotssupporting

confidence: 75%

A primary natrocarbonatitic association in the Deep Earth

2015

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“…arbonates are key phases in the chemistry and dynamics of our planet (1)(2)(3). Mass balance considerations and direct observation of inclusions in diamonds (4-6) strongly support the idea that carbonates are stable phases within the Earth's interior, especially in oxidized environments, such as deep subduction zones.…”

mentioning

confidence: 86%

Structures of dolomite at ultrahigh pressure and their influence on the deep carbon cycle

Merlini

Crichton

Hanfland

et al. 2012

Proc. Natl. Acad. Sci. U.S.A.

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Carbon-bearing solids, fluids, and melts in the Earth's deep interior may play an important role in the long-term carbon cycle. Here we apply synchrotron X-ray single crystal micro-diffraction techniques to identify and characterize the high-pressure polymorphs of dolomite. Dolomite-II, observed above 17 GPa, is triclinic, and its structure is topologically related to CaCO 3 -II. It transforms above 35 GPa to dolomite-III, also triclinic, which features carbon in [3 + 1] coordination at the highest pressures investigated (60 GPa). The structure is therefore representative of an intermediate between the low-pressure carbonates and the predicted ultra-high pressure carbonates, with carbon in tetrahedral coordination. Dolomite-III does not decompose up to the melting point (2,600 K at 43 GPa) and its thermodynamic stability demonstrates that this complex phase can transport carbon to depths of at least up to 1,700 km. Dolomite-III, therefore, is a likely occurring phase in areas containing recycled crustal slabs, which are more oxidized and Ca-enriched than the primitive lower mantle. Indeed, these phases may play an important role as carbon carriers in the whole mantle carbon cycling. As such, they are expected to participate in the fundamental petrological processes which, through carbon-bearing fluids and carbonate melts, will return carbon back to the Earth’s surface.

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“…One possibility is that radiogenic parent-daughter trace elements were fractionated in the mantle itself or by interaction of mantle and core (e.g., Vidal and Dosso 1978;Allègre et al 1980;Menzies and Wass 1983;Halliday et al 1990;Collerson et al 2010). However, most studies favor subducted slabs as the origin of the enriched components in OIB (e.g., Chase 1981;Hofmann and White 1982;Weaver 1991;Jackson et al 2007;Nebel et al 2013).…”

Section: Ocean Island Basaltsmentioning

confidence: 99%

Boron Isotopes in the Ocean Floor Realm and the Mantle

Marschall

2017

Advances in Isotope Geochemistry

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This chapter reviews the boron isotopic composition of the ocean floor, including pristine igneous oceanic crust such as mid-ocean ridge basalts and ocean island basalts and their implications for the B isotopic composition of the mantle. The chapter further discusses the B isotopic effects of assimilation of altered crustal materials in mantle-derived magmas. The systematics of seawater alteration on oceanic rocks are discussed, including sediments, igneous crust and serpentinization of ultramafic rocks and the respective marine hydrothermal vent fluids. The chapter concludes with a discussion of the secular evolution of the B isotopic composition of seawater.

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Origin of HIMU and EM-1 domains sampled by ocean island basalts, kimberlites and carbonatites: The role of CO2-fluxed lower mantle melting in thermochemical upwellings

Cited by 85 publications

References 167 publications

A primary natrocarbonatitic association in the Deep Earth

A primary natrocarbonatitic association in the Deep Earth

Structures of dolomite at ultrahigh pressure and their influence on the deep carbon cycle

Boron Isotopes in the Ocean Floor Realm and the Mantle

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