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
Molybdenum Evidence for Inherited Planetary Scale Isotope Heterogeneity of the Protosolar Nebula
TL;DR: In this article, molybdenum isotope abundances determined in samples of various meteorite classes are reported, including mesosiderites, pallasites, and chondrites characterized by a coupled excess in p-and r-process or a mirror deficit in s-process nuclides (Mo-w).
Rhodium, gold and other highly siderophile element abundances in chondritic meteorites
TL;DR: In this paper, the abundances of the highly siderophile elements (HSE) Re, Os, Ir, Ru, Pt, Rh, Pd and Au, and 187Os/188Os isotope ratios have been determined for a set of carbonaceous, ordinary, enstatite and Rumuruti chondrites, using an analytical technique that permits the precise and accurate measurement of all HSE from the same digestion aliquot.
214
Silicate perovskite-melt partitioning of trace elements and geochemical signature of a deep perovskitic reservoir
TL;DR: In this article, the authors determined the partitioning of a wide range of trace elements between silicate melts and MgSiO3 perovskites using both laser ablation-ICPMS and ion microprobe techniques.
213
Composition of the earth's upper mantle. I - Siderophile trace elements in ultramafic nodules
TL;DR: In this article, a comprehensive suite of ultramafic inclusions was collected as part of the Basaltic Volcanism Study Project and has been analyzed by instrument neutron activation analysis for major, minor, and some lithophile trace elements.
213
Chlorine and bromine abundance in MORB: the contrasting behaviour of the Mid-Atlantic Ridge and East Pacific Rise and implications for chlorine geodynamic cycle
TL;DR: In this paper, the authors analyzed MORB glasses from the mid-Atlantic Ridge (64°N-20°S) and the East Pacific Rise (7-21°N) for chlorine with an electron microprobe and chlorine and bromine by NAA.
211
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