Book Chapter10.1016/B978-0-08-095975-7.00201-1
Cosmochemical Estimates of Mantle Composition
TL;DR: The composition of the primitive mantle derived by as mentioned in this paper shows that Earth was assembled from material that shows many of the same chemical fractionation processes as chondritic meteorites. But the stable isotope record excludes chondrite meteorites as the ‘building blocks’ of Earth.
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Abstract: The composition of the primitive mantle derived here shows that Earth was assembled from material that shows many of the same chemical fractionation processes as chondritic meteorites. These processes occurred at the initial stage of the solar system formation, under conditions thought to be present in the solar nebula. But the stable isotope record excludes chondritic meteorites as the ‘building blocks’ of Earth. Meteorites formed in local environments separated from that part of the inner solar system where much of the material forming the terrestrial planets was sourced.
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Citations
Stable-isotopic anomalies and the accretionary assemblage of the Earth and Mars: A subordinate role for carbonaceous chondrites
TL;DR: In this article, the authors apply the lever rule to putative mixing lines on the e 50 Ti vs. e 54 Cr diagrams and Δ 17 O vs. δ 17 O diagrams and find that the carbonaceous/(carbonaceous+non-non-carbonaceous) mixing ratio is most likely close to (very roughly) 24% for Earth and 9% for Mars.
644
Metamorphic chemical geodynamics in continental subduction zones
TL;DR: In this paper, a review of the geochemical properties of UHP terranes is presented, focusing on the following issues in continental subduction zones: the time and duration of uHP metamorphism, the origin and action of metamorphic fluid/melt inside UHP slices, the element and isotope mobilities under HP to UHP conditions during continental collision, the origins of premetamorphic protoliths and its bearing on continental collision types, and the crustal detachment and crust mantle interaction in subduction channels.
557
Orogenic, ophiolitic and abyssal peridotites
Jean-Louis Bodinier,Marguerite Godard +1 more
- 01 Jan 2014
TL;DR: Orogenic, ophiolitic, and abyssal peridotites represent subcontinental, suboceanic, and subarc mantle rocks that were exhumed to the surface in various tectonic settings as mentioned in this paper.
502
Chemical composition of Earth's primitive mantle and its variance: 1. Method and results
Tanya Lyubetskaya,Jun Korenaga +1 more
TL;DR: In this article, a new statistical method was proposed to construct a model for the chemical composition of Earth's primitive mantle along with its variance, which is based on the melting trend exhibited by the global compilation of mantle peridotites, using cosmochemical constraints on the relative abundances of refractory lithophile elements.
The carbon cycle and associated redox processes through time
John M. Hayes,Jacob R. Waldbauer +1 more
TL;DR: Elevated abundances of 13C in carbonate minerals ca 2.3 Gyr old are here interpreted as indicating the importance of methanogenic bacteria in sediments rather than increased burial of organic carbon.
References
Chemical fractionations in meteorites. V - Volatile and siderophile elements in achondrites and ocean ridge basalts.
TL;DR: In this paper, radiochemical neutron activation analysis for 18 achondrites and four terrestrial basalts (3 ocean ridge, 1 continental) was performed by radiochemical activation for Ag, Au, Bi, Br, Cd, Co, Cs, Cu, Ga, In, Ir, Rb, Se, Tl and Zn.
144
Another look at the core density deficit of Earth’s outer core
TL;DR: In this paper, a thermal-pressure equation-of-state (EOS) was used to find that for assumed melting temperatures of pure iron at the inner-outer core (ICB) pressure of 330 GPa ranging from 7500 to 4800 K, the cdd ranges from 2.9 to 7%, respectively.
144
CaAl ratio and composition of the Earth's upper mantle
Herbert Palme,Klaus G. Nickel +1 more
TL;DR: In this article, the authors used the correlation of refractory elements vs MgO correlations in a suite of spinel-lherzolite xenoliths from basaltic rocks to estimate the chemical composition of the upper mantle.
143
The Earth’s tungsten budget during mantle melting and crust formation
Stephan König,Stephan König,Carsten Münker,Simon V. Hohl,H. Paulick,A. R. Barth,A. R. Barth,Markus Lagos,Jörg A. Pfänder,Anette Büchl +9 more
TL;DR: In this article, high-precision W concentration data obtained by isotope dilution for samples covering important silicate reservoirs on Earth was presented, revealing significant fractionations of W from other highly incompatible lithophile elements such as Th, U, and Ta.
141
Experimentally determined Si isotope fractionation between silicate and Fe metal and implications for Earth's core formation
Anat Shahar,Anat Shahar,Karen Ziegler,Edward D. Young,A. Ricolleau,Edwin A. Schauble,Yingwei Fei +6 more
TL;DR: Fitoussi et al. as discussed by the authors showed that silicon isotopes are not distributed uniformly between iron metal and rock when equilibrated at high temperatures, and they provided an experimental foundation for using isotope ratios of silicon as indicators of terrestrial planet formation processes.
141
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