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Composition of the Earth

Anderson, Don L. (1989) Composition of the Earth. Science, 243 (4886). pp. 367-370. ISSN 0036-8075. doi:10.1126/science.243.4889.367.

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New estimates of solar composition, compared to earlier measurements, are enriched in Fe and Ca relative to Mg, Al, and Si. The Fe/Si and Ca/Al atomic ratios are 30 to 40 percent higher than chondritic values. These changes necessitate a revision in the cosmic abundances and in the composition of the nebula from which the planets accreted (which have been based on chondritic values). These new values imply that the mantle could contain about 15 weight percent FeO and more CaMgSi_2O_6 than has been supposed. Geophysical data are consistent with a dense, FeO-rich lower mantle and a CaMgSi_2O_6 (diopside)-rich transition region. FeO contents of 13 to 18 weight percent appear to be typical of the mantles of bodies in the inner solar system. The oldest komatiites (high-temperature MgO-rich magmas) have a similar chemistry to the derived mantle. These results favor a chemically zoned mantle.

Item Type:Article
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Additional Information:© 1989 American Association for the Advancement of Science. 12 September 1988; accepted 31 October 1988. Supported by NSF grant EAR-85-093550. Contribution No. 4705, Division of Geological and Planetary Sciences.
Funding AgencyGrant Number
NSFEAR 85-09350
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Other Numbering System NameOther Numbering System ID
Division of Geological and Planetary Sciences4705
Issue or Number:4886
Record Number:CaltechAUTHORS:20140512-132006417
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Official Citation:Anderson, D. L. (1989). Composition of the Earth. Science, 243(4889), 367-370. doi: 10.1126/science.243.4889.367
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:45689
Deposited On:12 May 2014 23:25
Last Modified:10 Nov 2021 17:15

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