| Abstract: | A thick ferromanganese deposit encrusting fresh basaltic glass has been dredged from the Hess Deep in the eastern Pacific. Contiguous layers within the Fe-Mn crust have been analysed for uranium-series isotopes and metal contents. The rate of accumulation of the deposit, based on the decline of uranium-unsupported 230Th, is calculated to be approximately 50 mm per 106 yr. Based on hydration-rind dating of the underlying glass and an ‘exposure age‘ calculation, this rate is concluded to be too slow, and an accretion rate on the order of 1 mm per 103 yr is more consistent with our data. ?? 1977 Nature Publishing Group. |
| Genre: | Article |
| ProdID: | 70000996 |
| Citation Author: | Burnett, W. C.; Piper, D. Z. |
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| Citation End Page: | 600 |
| Citation Issue: | 5595 |
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| Citation Language: | English |
| Citation Larger Work Title: | Nature |
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| Citation Search Results Text: | Rapidly-formed ferromanganese deposit from the eastern Pacific Hess Deep; 1977; Article; Journal; Nature; Burnett, W. C.; Piper, D. Z. |
| Citation Start Page: | 596 |
| Citation Volume: | 265 |
| Citation Year: | 1977 |
| Type: | citation/reference |
| Text: | Rapidly-formed ferromanganese deposit from the eastern Pacific Hess Deep; 1977; Article; Journal; Nature; Burnett, W. C.; Piper, D. Z. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| URL (DIGITAL OBJECT IDENTIFIER): | http://dx.doi.org/10.1038/265596a0 |
| Date Other: | Tue, 28 Sep 2010 23:09 -0500 |
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