Journal ArticleDOI
Diamond genesis, mantle fractionations and mantle nitrogen content: a study of δ13C–N concentrations in diamonds
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In this article, a compilation of more than 1200 δ13C-N data from well-characterised diamonds show a correlation of the maximum diamond nitrogen content (i.e., a limit sector) with δ 13C over the full diamond δ-13C range.About:
This article is published in Earth and Planetary Science Letters.The article was published on 2001-02-15. It has received 196 citations till now. The article focuses on the topics: Diamond type & Diamond.read more
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Book ChapterDOI
Mantle Samples Included in Volcanic Rocks: Xenoliths and Diamonds
TL;DR: A review of the geochemistry of mantle xenoliths can be found in this article, where the authors review the geochemical properties of mantle nodules and find that they are dominantly alkaline in nature.
Journal ArticleDOI
Diamonds and the Geology of Mantle Carbon
Steven B. Shirey,Pierre Cartigny,Daniel J. Frost,Shantanu Keshav,Fabrizio Nestola,Paolo Nimis,D. Graham Pearson,Nikolai V. Sobolev,Michael J. Walter +8 more
TL;DR: For example, Harte et al. as mentioned in this paper found that diamond is a rare mineral, occurring at the part-per-billion level even within the most diamondiferous volcanic host rock although some rare eclogites have been known to contain 10−15% diamond.
Journal ArticleDOI
Nitrogen-enhanced greenhouse warming on early Earth
Colin Goldblatt,Colin Goldblatt,Mark Claire,Timothy M. Lenton,Adrian J. Matthews,Andrew J. Watson,Kevin Zahnle +6 more
TL;DR: In this paper, the authors used a radiative-convective climate model to show that more N2 in the atmosphere would have increased the warming effect of existing greenhouse gases by broadening their absorption lines.
Journal ArticleDOI
The nitrogen record of crust–mantle interaction and mantle convection from Archean to Present
Bernard Marty,Nicolas Dauphas +1 more
TL;DR: In this article, the authors propose that the large-scale N isotope heterogeneity of the mantle results from secular variation of the nitrogen isotope composition of recycled sediments, which is governed by specific metabolic paths having changed with the advent of oxygenated ocean.
Journal ArticleDOI
Massive recycling of nitrogen and other fluid-mobile elements (K, Rb, Cs, H) in a cold slab environment: evidence from HP to UHP oceanic metasediments of the Schistes Lustrés nappe (western Alps, Europe)
TL;DR: In this article, Nitrogen and hydrogen isotopic compositions together with N, K, Rb, Cs and H 2 O contents were measured on several high pressure (HP) to ultrahigh pressure (UHP) metasediments from the Schistes Lustres nappe (western Alps) and on unmetamorphosed sedimentary protoliths from the Apennines (Italy).
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Journal ArticleDOI
Diamond inclusions in garnets from metamorphic rocks: a new environment for diamond formation
TL;DR: In this article, the authors reported the occurrence of diamonds in situ in crustal rocks: highly retrograded high-pressure metamorphic garnet-pyroxene and pyroxene-carbonate-garnet rocks, biotite gneisses and schists from the Kokchetav massif, northern Kazakhstan, USSR.
Journal ArticleDOI
Origin of diamonds in old enriched mantle
TL;DR: Sub-calcic garnets encapsulated by diamonds from relatively young (90 Myr) kimberlites in southern Africa, yield ancient Sm-Nd and Rb-Sr model ages (3,200-3,300 Myr) as mentioned in this paper.
Journal ArticleDOI
Mantle-derived fluids in diamond micro-inclusions
TL;DR: Micro-inclusions in diamonds from Zaire and Botswana differ in composition from the more common large inclusions of the peridotitic or eclogitic assemblages as discussed by the authors.
Journal ArticleDOI
Carbon and nitrogen isotopes in the mantle
TL;DR: In this paper, a model of the Earth based on enstatite chondrite-type material was proposed, which showed that the upper mantle carbon fluxes are greater than 2.7·1013 g a−1, implying recycling of sedimentary carbon of the same mean isotopic composition.
Journal ArticleDOI
Co2 fluxes from mid-ocean ridges, arcs and plumes
Bernard Marty,Igor Tolstikhin +1 more
TL;DR: In this article, the effect of volatile fractionation during magma degassing, investigated using new rare gas and CO2 abundances determined simultaneously for a suite of Mid-Ocean Ridge (MOR) basalt glasses, is not the major factor controlling the spread of data, which mainly result from volatile heterogeneity in the mantle source.