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late veneer and the origins of volatiles of Earth

Acta Geochimica 2022年第4期41卷 650-664页

作者： Chun-Hui Li International Research Center for Planetary Science College of Earth SciencesChengdu University of TechnologyChengduChina

late veneer is an important paradigm in early Earth and planetary studies.It refers to the late addition of extraterrestrial materials to the Earth’s mantle after the core formation,which leads to the overabundances of highly siderophile elements in the primitive upper mantle.In this review,the origin,evolution,and expansion of the late veneer hypothesis are summarized,including some unresolved problems.I hope this review would be helpful for the new entrants to this field.

关键词： Highly siderophile elements late veneer Chondrites Primitive mantle Core formation Volatile elements

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Tungsten Isotopic Constraints on the Nature of Earth's Accreting Materials

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Acta Geologica Sinica(English Edition) 2022年第4期96卷 1213-1220页

作者： MEI Qingfeng YANG Jinhui State Key Laboratory of Lithospheric Evolution Institute of Geology and GeophysicsChinese Academy of SciencesBeijing 100029China College of Earth and Planetary Sciences University of Chinese Academy of SciencesBeijing 100049China

Tungsten isotope is a powerful tracer for the Earth’s accreting materials because of the distinct W isotope compositions of the non-carbonaceous meteorites and carbonaceous meteorites.To better understand the evolution of the early Earth,here we calculated the expectedμ^(183)W of the bulk silicate Earth for different assumed compositions of the proto-Earth’s mantle,the Moon-forming giant impactor,and the late veneer using a Monte Carlo approach.The result shows that the proto-Earth likely has a non-carbonaceous composition,while the carbonaceous chondrite-like materials were delivered to the Earth at the late stages of accretion.The predicted difference inμ^(183)W values between the bulk silicate Earth and the non-carbonaceous meteorites of the scenarios assuming a pure carbonaceous composition for the giant impactor is slightly bigger than that of the scenarios assuming either a pure non-carbonaceous or a mixed carbonaceous-non-carbonaceous composition for the giant impactor(~5 ppm versus~2 ppm).The ancient mantle reservoir that partially lacks the late veneer with carbonaceous composition should have a negativeμ^(183)W value(from-3 to 0).Uncertainties introduced by the cosmogenic effects and mass-independent fractionation should be concerned during the high precision measurement ofμ183W for meteorites and ancient terrestrial samples in further work.

关键词： tungsten isotope nucleosynthetic anomalies Moon-forming giant impact late veneer

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