The osmium isotopic composition of the Earth's primitive upper mantle

Meisel, Thomas; Walker, Richard J.; Morgan, John

doi:10.1038/383517a0

Cited by 352 publications

(154 citation statements)

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“…In contrast to primitive mantle values [78,79], the Os-isotope characteristics of the mantle source for the magmas in the Nagquo phioliteare slightly lower, which could imply that the source is a slightly depleted asthenospheric mantle. The Nd-Pb isotopic composition and geochemical data of mafic rocks from Tethyan ophiolites also indicate that they are derived from a geochemically depleted asthenospheric source with a clear Indian MORB-type isotopic signature [80].…”

mentioning

confidence: 72%

Os isotopic evidence for a carbonaceous chondritic mantle source for the Nagqu ophiolite from Tibet and its implications

et al. 2012

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Early-crystallizing chromian spinel (Cr-spinel) in the Nagqu ophiolite has high Os and low Re contents, and it is resistant to alteration during serpentinization, weathering and metamorphism. The chemical composition of primitive magma is preserved in Cr-spinel, which makes it suitable for determining the initial Os-isotope composition of the mantle source. This study presents Cr-spinel Os isotopes and zircon U-Pb ages for cumulate dunite and gabbro, respectively, in the same cumulate section of the ophiolite at Nagqu in Tibet. The results shed light on the formation and evolution of lithospheric mantle. The Nagqu ophiolite is located in the central part of the Bangong-Nujiang suture zone. It is a remnant of the Neotethyan oceanic crust, and contains cumulate dunite and gabbro. Zircon from the gabbro yielded a weighted mean 206 Pb/ 238 U age of 183.7±1 Ma. Cr-spinel exhibits  Os values of 0.2 to 0.3, suggesting that the mantle source for the dunite is similar to that of carbonaceous chondrites. Thus, the Tibetan lithosphere is primarily a relic of Tethyan oceanic lithosphere, which has formed by the transformation of the normal asthenospheric mantle in the Mesozoic. This is the first study to combine the spinel Os isotopes with accurate zircon U-Pb ages to constrain the geochemical characteristics of the mantle source for the ophiolite.Re-Os isotopes, spinel, ophiolite, Nagqu, Tibet Citation:Huang Q S, Shi R D, Liu D L, et al. Os isotopic evidence for a carbonaceous chondritic mantle source for the Nagqu ophiolite from Tibet and its implications. Chin Sci Bull, 2013, 58: 9298,

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confidence: 72%

Os isotopic evidence for a carbonaceous chondritic mantle source for the Nagqu ophiolite from Tibet and its implications

et al. 2012

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“…The chondritic to sub-chondritic Os isotopic composition of most Saint Paul Fracture Zone peridotites contrasts with models of Os isotopic evolution of the primitive upper mantle as constrained by spinel lherzolites from continental environments that support a more chondritic value for the bulk upper mantle (Meisel et al, 1996(Meisel et al, , 2001 …”

Section: Geochemistry Of the Abyssal Peridotitementioning

confidence: 83%

Geophysical and geochemical evidence for cold upper mantle beneath the Equatorial Atlantic Ocean

Sichel¹,

Esperança²,

Motoki³

et al. 2008

Rev. Bras. Geof.

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“…Os, Pt, Re, Au) in Earth's mantle, which are higher than expected for metal-silicate equilibration during core formation (Brenan and McDonough, 2009;Mann et al, 2012). Moreover, the HSE in the mantle occur in broadly chondritic relative proportions, which is unexpected for metal-silicate partitioning (Meisel et al, 1996;Becker et al, 2006). These observations have led to the idea that the elevated HSE abundances in Earth's mantle reflect the late addition of broadly chondritic material (the 'late veneer') to the mantle after core formation was complete (e.g.…”

Section: Introductionmentioning

confidence: 81%

Highly siderophile element and 182 W evidence for a partial late veneer in the source of 3.8 Ga rocks from Isua, Greenland

Dale

Kruijer

Burton

2017

Earth and Planetary Science Letters

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Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-pro t purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. was added. In this case, the Isua source can represent ambient mantle after the giant moonforming impact, into which only a part of Earth's full late veneer was mixed, rather than an isotopically distinct mantle domain produced by early differentiation, which would probably require survival through the giant Moon-forming impact.3

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The osmium isotopic composition of the Earth's primitive upper mantle

Cited by 352 publications

References 30 publications

Os isotopic evidence for a carbonaceous chondritic mantle source for the Nagqu ophiolite from Tibet and its implications

Os isotopic evidence for a carbonaceous chondritic mantle source for the Nagqu ophiolite from Tibet and its implications

Geophysical and geochemical evidence for cold upper mantle beneath the Equatorial Atlantic Ocean

Highly siderophile element and 182 W evidence for a partial late veneer in the source of 3.8 Ga rocks from Isua, Greenland

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