典型文献
Tungsten Isotopic Constraints on the Nature of Earth's Accreting Materials
文献摘要：
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 expected μ183W 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 in μ183W 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 negative μ183W 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.
文献关键词：
中图分类号：
作者姓名：
MEI Qingfeng;YANG Jinhui
作者机构：
State Key Laboratory of Lithospheric Evolution,Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,China;College of Earth and Planetary Sciences,University of Chinese Academy of Sciences,Beijing 100049,China
文献出处：
引用格式：
[1]MEI Qingfeng;YANG Jinhui-.Tungsten Isotopic Constraints on the Nature of Earth's Accreting Materials)[J].地质学报（英文版）,2022(04):1213-1220
A类：
Accreting,accreting,183W,veneer
B类：
Tungsten,Isotopic,Constraints,Nature,Earth,Materials,isotope,powerful,tracer,materials,because,distinct,compositions,carbonaceous,meteorites,To,better,understand,evolution,early,here,calculated,expected,bulk,silicate,different,assumed,proto,mantle,Moon,forming,giant,impactor,using,Monte,Carlo,approach,result,shows,that,likely,has,while,chondrite,were,delivered,stages,accretion,predicted,difference,values,between,scenarios,assuming,pure,slightly,bigger,than,either,mixed,ppm,versus,ancient,reservoir,partially,lacks,should,have,negative,from,Uncertainties,introduced,by,cosmogenic,effects,mass,independent,fractionation,concerned,during,high,precision,measurement,terrestrial,samples,further,work
AB值：
0.469524
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