Mixing, volatile loss and compositional change during impact-driven accretion of the Earth.
The degree to which efficient mixing of new material or losses of earlier accreted material to space characterize the growth of Earth-like planets is poorly constrained and probably changed with time. These processes can be studied by parallel modelling of data from different radiogenic isotope syst...
| Váldodahkki: | |
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| Materiálatiipa: | Journal article |
| Giella: | English |
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2004
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| _version_ | 1826274071998889984 |
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| author | Halliday, A |
| author_facet | Halliday, A |
| author_sort | Halliday, A |
| collection | OXFORD |
| description | The degree to which efficient mixing of new material or losses of earlier accreted material to space characterize the growth of Earth-like planets is poorly constrained and probably changed with time. These processes can be studied by parallel modelling of data from different radiogenic isotope systems. The tungsten isotope composition of the silicate Earth yields a model timescale for accretion that is faster than current estimates based on terrestrial lead and xenon isotope data and strontium, tungsten and lead data for lunar samples. A probable explanation for this is that impacting core material did not always mix efficiently with the silicate portions of the Earth before being added to the Earth's core. Furthermore, tungsten and strontium isotope compositions of lunar samples provide evidence that the Moon-forming impacting protoplanet Theia was probably more like Mars, with a volatile-rich, oxidized mantle. Impact-driven erosion was probably a significant contributor to the variations in moderately volatile element abundance and oxidation found among the terrestrial planets. |
| first_indexed | 2024-03-06T22:37:53Z |
| format | Journal article |
| id | oxford-uuid:5a8bba26-9d40-4f0b-9632-89d89cc76ae2 |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-06T22:37:53Z |
| publishDate | 2004 |
| record_format | dspace |
| spelling | oxford-uuid:5a8bba26-9d40-4f0b-9632-89d89cc76ae22022-03-26T17:16:22ZMixing, volatile loss and compositional change during impact-driven accretion of the Earth.Journal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:5a8bba26-9d40-4f0b-9632-89d89cc76ae2EnglishSymplectic Elements at Oxford2004Halliday, AThe degree to which efficient mixing of new material or losses of earlier accreted material to space characterize the growth of Earth-like planets is poorly constrained and probably changed with time. These processes can be studied by parallel modelling of data from different radiogenic isotope systems. The tungsten isotope composition of the silicate Earth yields a model timescale for accretion that is faster than current estimates based on terrestrial lead and xenon isotope data and strontium, tungsten and lead data for lunar samples. A probable explanation for this is that impacting core material did not always mix efficiently with the silicate portions of the Earth before being added to the Earth's core. Furthermore, tungsten and strontium isotope compositions of lunar samples provide evidence that the Moon-forming impacting protoplanet Theia was probably more like Mars, with a volatile-rich, oxidized mantle. Impact-driven erosion was probably a significant contributor to the variations in moderately volatile element abundance and oxidation found among the terrestrial planets. |
| spellingShingle | Halliday, A Mixing, volatile loss and compositional change during impact-driven accretion of the Earth. |
| title | Mixing, volatile loss and compositional change during impact-driven accretion of the Earth. |
| title_full | Mixing, volatile loss and compositional change during impact-driven accretion of the Earth. |
| title_fullStr | Mixing, volatile loss and compositional change during impact-driven accretion of the Earth. |
| title_full_unstemmed | Mixing, volatile loss and compositional change during impact-driven accretion of the Earth. |
| title_short | Mixing, volatile loss and compositional change during impact-driven accretion of the Earth. |
| title_sort | mixing volatile loss and compositional change during impact driven accretion of the earth |
| work_keys_str_mv | AT hallidaya mixingvolatilelossandcompositionalchangeduringimpactdrivenaccretionoftheearth |