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The Earth's Lower MantleCarbonatitic Lower-Mantle Mineral Association

The Earth's Lower Mantle: Carbonatitic Lower-Mantle Mineral Association [In addition to ultramafic and mafic associationsMafic association, 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: carbonatesCarbonates, halidesHalides, fluoridesFluorides, phosphatesPhosphates, sulphates, oxides, silicates, sulphidesSulphide and native elements. In addition, volatiles are also present in this association. Among oxides, coexisting periclase and wüstiteWüstite were identified, pointing to the formation of the natrocarbonatitic association at a depth greater than 2000 km. Some iron-rich (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 carbonCarbon-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-densityDensity fluids.] http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png

The Earth's Lower MantleCarbonatitic Lower-Mantle Mineral Association

Part of the Springer Geology Book Series
Kaminsky, Felix V.
The Earth's Lower Mantle — May 23, 2017
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23 pages

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Publisher
Springer International Publishing
Copyright
© Springer International Publishing AG 2017
ISBN
978-3-319-55683-3
Pages
205 –228
DOI
10.1007/978-3-319-55684-0_6
Publisher site
See Chapter on Publisher Site

Abstract

[In addition to ultramafic and mafic associationsMafic association, 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: carbonatesCarbonates, halidesHalides, fluoridesFluorides, phosphatesPhosphates, sulphates, oxides, silicates, sulphidesSulphide and native elements. In addition, volatiles are also present in this association. Among oxides, coexisting periclase and wüstiteWüstite were identified, pointing to the formation of the natrocarbonatitic association at a depth greater than 2000 km. Some iron-rich (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 carbonCarbon-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-densityDensity fluids.]

Published: May 23, 2017

Keywords: Partial Melting; Lower Mantle; Lowermost Mantle; Sodium Carbonate Sodium; Natrocarbonatitic Lava

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