Peridotite xenoliths from the Polynesian Austral and Samoa hotspots: Implications for the destruction of ancient 187Os and 142Nd isotopic domains and the preservation of Hadean 129Xe in the modern convecting mantle
TLDR
The preservation of early-formed (early-Hadean) 129Xe/130Xe isotopic heterogeneities in the modern convecting mantle is possible for other elements, such as Xe, that are not as efficiently recycled back into the mantle, owing to greater fluid mobility as discussed by the authors.About:
This article is published in Geochimica et Cosmochimica Acta.The article was published on 2016-07-15 and is currently open access. It has received 17 citations till now. The article focuses on the topics: Mantle (geology) & Peridotite.read more
Citations
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Preservation of Earth-forming events in the tungsten isotopic composition of modern flood basalts.
Hanika Rizo,Richard J. Walker,Richard W. Carlson,Mary F. Horan,Sujoy Mukhopadhyay,Vicky Manthos,Don Francis,Matthew G. Jackson +7 more
TL;DR: High-precision tungsten isotopic data from rocks from two large igneous provinces, the North Atlantic Igneous Province and the Ontong Java Plateau, reveal preservation to the Phanerozoic of tung sten isotopic heterogeneities in the mantle, indicating that portions of the mantle that formed during Earth's primary accretionary period have survived to the present.
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Early episodes of high-pressure core formation preserved in plume mantle.
Colin R.M. Jackson,Colin R.M. Jackson,Neil R. Bennett,Zhixue Du,Elizabeth Cottrell,Yingwei Fei +5 more
TL;DR: Measurements of I partitioning between liquid Fe alloys and liquid silicates at high pressure and temperature demonstrate that I becomes progressively more siderophile as pressure increases, so that portions of mantle that experienced high-pressure core formation will have large I/Pu depletions not related to volatility.
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Heavy iron in large gem diamonds traces deep subduction of serpentinized ocean floor.
TL;DR: In this paper, the authors reported Fe-Ni-rich metallic inclusions in sublithospheric diamonds from a depth of 360 to 750 km with isotopically heavy iron and unradiogenic osmium.
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Combined Lithophile-Siderophile Isotopic Constraints on Hadean Processes Preserved in Ocean Island Basalt Sources
Bradley J. Peters,Bradley J. Peters,Andrea Mundl-Petermeier,Andrea Mundl-Petermeier,Richard W. Carlson,Richard J. Walker,James M.D. Day +6 more
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Effective global mixing of the highly siderophile elements into Earth’s mantle inferred from oceanic abyssal peridotites
TL;DR: In this paper , the authors report new HSE abundance data and 187Os/188Os ratios, in conjunction with mineral chemistry and bulk rock major and trace-element compositions for abyssal peridotites from the fast-spreading Pacific Antarctic Ridge (PAR) and East Pacific Rise (Hess Deep), and for slow to intermediate spreading ridges from the Southwest Indian Ridge, Central Indian Ridge and Mid-Atlantic Ridge.
References
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Composition of the depleted mantle
TL;DR: In this article, a combination of approaches is required to estimate the major and trace element abundances in the depleted mantle (DM), the source for mid-ocean ridge basalts (MORBs).
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Evolution of the depleted mantle: Hf isotope evidence from juvenile rocks through time
TL;DR: In this article, the covariant behavior of Lu-Hf and Sm-Nd isotopes during most magmatic processes has been recognized, but the details of this behavior in the depleted mantle reservoir have not been adequately examined.
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Re-Os Ages of Group IIA, IIIA, IVA, and IVB Iron Meteorites
TL;DR: In this article, negative thermal ionization mass spectrometry with modified digestion and equilibration techniques was used to determine the rhenium and osmium concentrations and ratios of group IIA, IIIA, IVA, and IVB iron meteorites.
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Ultramafic inclusions from San Carlos, Arizona: Petrologic and geochemical data bearing on their petrogenesis
Frederick A. Frey,Martin Prinz +1 more
TL;DR: In this article, the authors classified ultramafic inclusions from San Carlos, Arizona into two groups: Group I inclusions are dominated by magnesian (Mg/Mg + ΣFe= 0.86-0.91), olivine-rich peridotites containing Cr-rich clinopyroxene and spinel.
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THE Re-Os ISOTOPE SYSTEM IN COSMOCHEMISTRY AND HIGH-TEMPERATURE GEOCHEMISTRY
TL;DR: The Re-Os isotope sytem, based on the long-lived β− transition of 187Re to 187Os, has matured to wide use in cosmochemistry and high-temperature geochemistry as discussed by the authors.