Application of thermodynamic modelling to natural mantle xenoliths: examples of density variations and pressure–temperature evolution of the lithospheric mantle

Ziberna, Luca; Klemme, Stephan

doi:10.1007/s00410-016-1229-9

Cited by 14 publications

(2 citation statements)

References 87 publications

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“…Though we cannot exclude the presence of additional mineralogical or petrological components or phases responsible for the observed high cratonic shear-wave velocities (see Text S3 for discussion; cf. Aulbach & Jacob, 2016;Bass, 1986;Frost & McCammon, 2008;Isaak & Ohno, 2003;Klemme et al, 2009;McCammon, 2005;Milman et al, 2001;Reichmann et al, 2013;Stagno et al, 2013;Ziberna et al, 2013;Ziberna & Klemme, 2016), we note that (i) eclogitic minerals (garnet, omphacite, and kyanite) and diamond have the highest V s of commonly observed cratonic mantle constituents in xenoliths, (ii) both are key constituents of erupted mantle material from subcratonic lithospheric mantle over the depth range of interest in this study, and (iii) their bulk abundances in cratonic lithospheric mantle are loosely constrained.…”

Section: 1029/2018gc007534mentioning

confidence: 78%

Multidisciplinary Constraints on the Abundance of Diamond and Eclogite in the Cratonic Lithosphere

Garber

Maurya

Hernandez

et al. 2018

Geochem Geophys Geosyst

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Some seismic models derived from tomographic studies indicate elevated shear‐wave velocities (≥4.7 km/s) around 120–150 km depth in cratonic lithospheric mantle. These velocities are higher than those of cratonic peridotites, even assuming a cold cratonic geotherm (i.e., 35 mW/m2 surface heat flux) and accounting for compositional heterogeneity in cratonic peridotite xenoliths and the effects of anelasticity. We reviewed various geophysical and petrologic constraints on the nature of cratonic roots (seismic velocities, lithology/mineralogy, electrical conductivity, and gravity) and explored a range of permissible rock and mineral assemblages that can explain the high seismic velocities. These constraints suggest that diamond and eclogite are the most likely high‐Vs candidates to explain the observed velocities, but matching the high shear‐wave velocities requires either a large proportion of eclogite (>50 vol.%) or the presence of up to 3 vol.% diamond, with the exact values depending on peridotite and eclogite compositions and the geotherm. Both of these estimates are higher than predicted by observations made on natural samples from kimberlites. However, a combination of ≤20 vol.% eclogite and ~2 vol.% diamond may account for high shear‐wave velocities, in proportions consistent with multiple geophysical observables, data from natural samples, and within mass balance constraints for global carbon. Our results further show that cratonic thermal structure need not be significantly cooler than determined from xenolith thermobarometry.

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Section: 1029/2018gc007534mentioning

confidence: 78%

Multidisciplinary Constraints on the Abundance of Diamond and Eclogite in the Cratonic Lithosphere

Garber

Maurya

Hernandez

et al. 2018

Geochem Geophys Geosyst

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“…d, Variability of the continental elevation to lithospheric age from Poupinet and Shapiro (2009). thermodynamic calculations allows constraining transitions of Albearing phases (plagioclase-spinel-garnet) which are responsible for strong density variations (Klemme, 2004;Klemme et al, 2009;Jennings and Holland, 2015;Ziberna and Klemme, 2016). The melt phase and corresponding melt fraction is self-consistently predicted along with the other solid solution phases providing the most stable mineral (and melt) assemblage.…”

Section: Thermodynamic Calculations Of Mantle Densitymentioning

confidence: 99%

Relative continent/mid-ocean ridge elevation: a reference case for isostasy in geodynamics

Theunissen¹,

Huismans²,

Lü³

et al. 2022

Preprint

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<p>The choice of crustal and mantle densities in numerical geodynamic models is usually based on convention. The isostatic component of the topography is, however, in most if not all cases not calibrated to fit observations resulting in not very well constrained elevations. The density distribution on Earth is not easy to constrain because it involves multiple variables (temperature, pressure, composition, and deformation). We provide a review and global analysis of the topography of the Earth showing that elevation of stable continents and active mid-ocean ridges far from hotspots on average is +400 m and -2750 m respectively. We show that density values for the crust and mantle, commonly used for isostatic modeling result in highly inaccurate prediction of topography. We use thermodynamic calculations to constrain the density distribution of the continental lithospheric mantle, sub-lithospheric mantle, the mid-ocean ridge mantle, and review data on crustal density. We couple the thermo-dynamic consistent density calculations with 2-D forward geodynamic modelling including melt prediction and calibrate crustal and mantle densities that match the observed elevation difference. Our results can be used as a reference case for geodynamic modeling that accurately fits the relative elevation between continents and mid-ocean ridges consistent with geophysical observations and thermodynamic calculations.&#160;</p>

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Composition and thermal evolution of the lithospheric mantle beneath the Ribeira Belt, SE Brazil: evidence from spinel peridotite xenoliths

Almeida

Janasi

Faleiros

et al. 2022

Int J Earth Sci (Geol Rundsch)

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Application of thermodynamic modelling to natural mantle xenoliths: examples of density variations and pressure–temperature evolution of the lithospheric mantle

Cited by 14 publications

References 87 publications

Multidisciplinary Constraints on the Abundance of Diamond and Eclogite in the Cratonic Lithosphere

Multidisciplinary Constraints on the Abundance of Diamond and Eclogite in the Cratonic Lithosphere

Relative continent/mid-ocean ridge elevation: a reference case for isostasy in geodynamics

Composition and thermal evolution of the lithospheric mantle beneath the Ribeira Belt, SE Brazil: evidence from spinel peridotite xenoliths

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