Isopycnicity of cratonic mantle restricted to kimberlite provinces

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Isopycnicity of cratonic mantle restricted to kimberlite provinces. / Artemieva, I. M.; Thybo, H.; Cherepanova, Y.

In: Earth and Planetary Science Letters, Vol. 505, 2019, p. 13-19.

Research output: Contribution to journalJournal articleResearchpeer-review

Harvard

Artemieva, IM, Thybo, H & Cherepanova, Y 2019, 'Isopycnicity of cratonic mantle restricted to kimberlite provinces', Earth and Planetary Science Letters, vol. 505, pp. 13-19. https://doi.org/10.1016/j.epsl.2018.09.034

APA

Artemieva, I. M., Thybo, H., & Cherepanova, Y. (2019). Isopycnicity of cratonic mantle restricted to kimberlite provinces. Earth and Planetary Science Letters, 505, 13-19. https://doi.org/10.1016/j.epsl.2018.09.034

Vancouver

Artemieva IM, Thybo H, Cherepanova Y. Isopycnicity of cratonic mantle restricted to kimberlite provinces. Earth and Planetary Science Letters. 2019;505:13-19. https://doi.org/10.1016/j.epsl.2018.09.034

Author

Artemieva, I. M. ; Thybo, H. ; Cherepanova, Y. / Isopycnicity of cratonic mantle restricted to kimberlite provinces. In: Earth and Planetary Science Letters. 2019 ; Vol. 505. pp. 13-19.

Bibtex

@article{aeef2b94bcaf499f9bc19ddcb7795bfb,
title = "Isopycnicity of cratonic mantle restricted to kimberlite provinces",
abstract = "The isopycnicity hypothesis states that the lithospheric mantle of ancient platforms has a unique composition such that high density due to low lithosphere temperature is nearly compensated by low-density composition of old cratonic mantle. This hypothesis is supported by petrological studies of mantle xenoliths hosted in kimberlite magmas. However, the representativeness of the kimberlite sampling may be questioned, given that any type of magmatism is atypical for stable regions. We use EGM2008 gravity data to examine the density structure of the Siberian lithospheric mantle, which we compare with independent constraints based on free-board analysis. We find that in the Siberian craton, geochemically studied kimberlite-hosted xenoliths sample exclusively those parts of the mantle where the isopycnic condition is satisfied, while the pristine lithospheric mantle, which has not been affected by magmatism, has a significantly lower density than required by isopycnicity. This discovery allows us to conclude that our knowledge on the composition of cratonic mantle is incomplete and that it is biased by kimberlite sampling which provides a deceptive basis for the isopycnicity hypothesis.",
keywords = "gravity, isopycnicity, kimberlites, lithosphere, mantle density, Siberian traps",
author = "Artemieva, {I. M.} and H. Thybo and Y. Cherepanova",
year = "2019",
doi = "10.1016/j.epsl.2018.09.034",
language = "English",
volume = "505",
pages = "13--19",
journal = "Earth and Planetary Science Letters",
issn = "0012-821X",
publisher = "Elsevier",

}

RIS

TY - JOUR

T1 - Isopycnicity of cratonic mantle restricted to kimberlite provinces

AU - Artemieva, I. M.

AU - Thybo, H.

AU - Cherepanova, Y.

PY - 2019

Y1 - 2019

N2 - The isopycnicity hypothesis states that the lithospheric mantle of ancient platforms has a unique composition such that high density due to low lithosphere temperature is nearly compensated by low-density composition of old cratonic mantle. This hypothesis is supported by petrological studies of mantle xenoliths hosted in kimberlite magmas. However, the representativeness of the kimberlite sampling may be questioned, given that any type of magmatism is atypical for stable regions. We use EGM2008 gravity data to examine the density structure of the Siberian lithospheric mantle, which we compare with independent constraints based on free-board analysis. We find that in the Siberian craton, geochemically studied kimberlite-hosted xenoliths sample exclusively those parts of the mantle where the isopycnic condition is satisfied, while the pristine lithospheric mantle, which has not been affected by magmatism, has a significantly lower density than required by isopycnicity. This discovery allows us to conclude that our knowledge on the composition of cratonic mantle is incomplete and that it is biased by kimberlite sampling which provides a deceptive basis for the isopycnicity hypothesis.

AB - The isopycnicity hypothesis states that the lithospheric mantle of ancient platforms has a unique composition such that high density due to low lithosphere temperature is nearly compensated by low-density composition of old cratonic mantle. This hypothesis is supported by petrological studies of mantle xenoliths hosted in kimberlite magmas. However, the representativeness of the kimberlite sampling may be questioned, given that any type of magmatism is atypical for stable regions. We use EGM2008 gravity data to examine the density structure of the Siberian lithospheric mantle, which we compare with independent constraints based on free-board analysis. We find that in the Siberian craton, geochemically studied kimberlite-hosted xenoliths sample exclusively those parts of the mantle where the isopycnic condition is satisfied, while the pristine lithospheric mantle, which has not been affected by magmatism, has a significantly lower density than required by isopycnicity. This discovery allows us to conclude that our knowledge on the composition of cratonic mantle is incomplete and that it is biased by kimberlite sampling which provides a deceptive basis for the isopycnicity hypothesis.

KW - gravity

KW - isopycnicity

KW - kimberlites

KW - lithosphere

KW - mantle density

KW - Siberian traps

U2 - 10.1016/j.epsl.2018.09.034

DO - 10.1016/j.epsl.2018.09.034

M3 - Journal article

VL - 505

SP - 13

EP - 19

JO - Earth and Planetary Science Letters

JF - Earth and Planetary Science Letters

SN - 0012-821X

ER -

ID: 212953953