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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. http://resolver.caltech.edu/CaltechAUTHORS:20140512-132006417

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Abstract

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
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1126/science.243.4889.367 DOIArticle
http://www.sciencemag.org/content/243/4889/367.abstractPublisherArticle
http://www.jstor.org/stable/1702875OrganizationArticle
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.
Funders:
Funding AgencyGrant Number
NSFEAR 85-09350
Other Numbering System:
Other Numbering System NameOther Numbering System ID
Division of Geological and Planetary Sciences4705
Record Number:CaltechAUTHORS:20140512-132006417
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20140512-132006417
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
Collection:CaltechAUTHORS
Deposited By: Jason Perez
Deposited On:12 May 2014 23:25
Last Modified:12 May 2014 23:25

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